{"id":621,"date":"2025-02-21T00:33:12","date_gmt":"2025-02-20T16:33:12","guid":{"rendered":"http:\/\/39.104.51.85\/?p=621"},"modified":"2025-02-21T00:33:13","modified_gmt":"2025-02-20T16:33:13","slug":"ctf%e5%85%a5%e9%97%a8-%e7%b3%bb%e7%bb%9f%e8%b0%83%e7%94%a8%e3%80%81shellcode%e3%80%81%e6%b2%99%e7%ae%b1%ef%bc%88orw%ef%bc%89%e4%b8%8esrop","status":"publish","type":"post","link":"http:\/\/39.104.51.85\/index.php\/2025\/02\/21\/ctf%e5%85%a5%e9%97%a8-%e7%b3%bb%e7%bb%9f%e8%b0%83%e7%94%a8%e3%80%81shellcode%e3%80%81%e6%b2%99%e7%ae%b1%ef%bc%88orw%ef%bc%89%e4%b8%8esrop\/","title":{"rendered":"CTF\u5165\u95e8\u2014\u2014\u7cfb\u7edf\u8c03\u7528\u3001shellcode\u3001\u6c99\u7bb1\uff08orw\uff09\u4e0esrop"},"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\/2025\/02\/21\/ctf%e5%85%a5%e9%97%a8-%e7%b3%bb%e7%bb%9f%e8%b0%83%e7%94%a8%e3%80%81shellcode%e3%80%81%e6%b2%99%e7%ae%b1%ef%bc%88orw%ef%bc%89%e4%b8%8esrop\/#%E4%BD%95%E4%B8%BA%E7%B3%BB%E7%BB%9F%E8%B0%83%E7%94%A8\" title=\"\u4f55\u4e3a\u7cfb\u7edf\u8c03\u7528\">\u4f55\u4e3a\u7cfb\u7edf\u8c03\u7528<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"http:\/\/39.104.51.85\/index.php\/2025\/02\/21\/ctf%e5%85%a5%e9%97%a8-%e7%b3%bb%e7%bb%9f%e8%b0%83%e7%94%a8%e3%80%81shellcode%e3%80%81%e6%b2%99%e7%ae%b1%ef%bc%88orw%ef%bc%89%e4%b8%8esrop\/#1read0buf0x40\" title=\"1.read(0,buf,0x40)\">1.read(0,buf,0x40)<\/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\/2025\/02\/21\/ctf%e5%85%a5%e9%97%a8-%e7%b3%bb%e7%bb%9f%e8%b0%83%e7%94%a8%e3%80%81shellcode%e3%80%81%e6%b2%99%e7%ae%b1%ef%bc%88orw%ef%bc%89%e4%b8%8esrop\/#2execve%E2%80%9Cbinsh%E2%80%9D00%EF%BC%88%E8%BF%99%E9%87%8C%E5%81%87%E8%AE%BEbinsh%E5%AD%97%E7%AC%A6%E4%B8%B2%E5%B7%B2%E7%BB%8F%E5%86%99%E5%85%A5%E4%BA%860xdeadbeef%E8%BF%99%E4%B8%AA%E5%9C%B0%E5%9D%80%EF%BC%89\" title=\"2.execve(&#8220;\/bin\/sh&#8221;,0,0)\uff08\u8fd9\u91cc\u5047\u8bbe\/bin\/sh\u5b57\u7b26\u4e32\u5df2\u7ecf\u5199\u5165\u4e860xdeadbeef\u8fd9\u4e2a\u5730\u5740\uff09\">2.execve(&#8220;\/bin\/sh&#8221;,0,0)\uff08\u8fd9\u91cc\u5047\u8bbe\/bin\/sh\u5b57\u7b26\u4e32\u5df2\u7ecf\u5199\u5165\u4e860xdeadbeef\u8fd9\u4e2a\u5730\u5740\uff09<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"http:\/\/39.104.51.85\/index.php\/2025\/02\/21\/ctf%e5%85%a5%e9%97%a8-%e7%b3%bb%e7%bb%9f%e8%b0%83%e7%94%a8%e3%80%81shellcode%e3%80%81%e6%b2%99%e7%ae%b1%ef%bc%88orw%ef%bc%89%e4%b8%8esrop\/#shellcode\" title=\"shellcode\">shellcode<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"http:\/\/39.104.51.85\/index.php\/2025\/02\/21\/ctf%e5%85%a5%e9%97%a8-%e7%b3%bb%e7%bb%9f%e8%b0%83%e7%94%a8%e3%80%81shellcode%e3%80%81%e6%b2%99%e7%ae%b1%ef%bc%88orw%ef%bc%89%e4%b8%8esrop\/#%E6%B2%99%E7%AE%B1%EF%BC%88orw%EF%BC%89\" title=\"\u6c99\u7bb1\uff08orw\uff09\">\u6c99\u7bb1\uff08orw\uff09<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"http:\/\/39.104.51.85\/index.php\/2025\/02\/21\/ctf%e5%85%a5%e9%97%a8-%e7%b3%bb%e7%bb%9f%e8%b0%83%e7%94%a8%e3%80%81shellcode%e3%80%81%e6%b2%99%e7%ae%b1%ef%bc%88orw%ef%bc%89%e4%b8%8esrop\/#%E4%B8%80%E4%B8%AA%E5%85%B8%E5%9E%8B%E7%9A%84%E7%99%BD%E5%90%8D%E5%8D%95%E6%B2%99%E7%AE%B1%E5%A6%82%E4%B8%8B\" title=\"\u4e00\u4e2a\u5178\u578b\u7684\u767d\u540d\u5355\u6c99\u7bb1\u5982\u4e0b\">\u4e00\u4e2a\u5178\u578b\u7684\u767d\u540d\u5355\u6c99\u7bb1\u5982\u4e0b<\/a><\/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\/2025\/02\/21\/ctf%e5%85%a5%e9%97%a8-%e7%b3%bb%e7%bb%9f%e8%b0%83%e7%94%a8%e3%80%81shellcode%e3%80%81%e6%b2%99%e7%ae%b1%ef%bc%88orw%ef%bc%89%e4%b8%8esrop\/#%E4%B8%80%E4%B8%AA%E5%85%B8%E5%9E%8B%E7%9A%84%E9%BB%91%E5%90%8D%E5%8D%95%E6%B2%99%E7%AE%B1%E5%A6%82%E4%B8%8B\" title=\"\u4e00\u4e2a\u5178\u578b\u7684\u9ed1\u540d\u5355\u6c99\u7bb1\u5982\u4e0b\">\u4e00\u4e2a\u5178\u578b\u7684\u9ed1\u540d\u5355\u6c99\u7bb1\u5982\u4e0b<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"http:\/\/39.104.51.85\/index.php\/2025\/02\/21\/ctf%e5%85%a5%e9%97%a8-%e7%b3%bb%e7%bb%9f%e8%b0%83%e7%94%a8%e3%80%81shellcode%e3%80%81%e6%b2%99%e7%ae%b1%ef%bc%88orw%ef%bc%89%e4%b8%8esrop\/#%E4%BE%8B%E9%A2%98%E8%AE%B2%E8%A7%A3\" title=\"\u4f8b\u9898\u8bb2\u89e3\">\u4f8b\u9898\u8bb2\u89e3<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"http:\/\/39.104.51.85\/index.php\/2025\/02\/21\/ctf%e5%85%a5%e9%97%a8-%e7%b3%bb%e7%bb%9f%e8%b0%83%e7%94%a8%e3%80%81shellcode%e3%80%81%e6%b2%99%e7%ae%b1%ef%bc%88orw%ef%bc%89%e4%b8%8esrop\/#srop\" title=\"srop\">srop<\/a><\/li><\/ul><\/nav><\/div>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E4%BD%95%E4%B8%BA%E7%B3%BB%E7%BB%9F%E8%B0%83%E7%94%A8\"><\/span>\u4f55\u4e3a\u7cfb\u7edf\u8c03\u7528<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u90a3\u4e9b\u6df1\u5965\u7684\u96be\u61c2\u7684\u89e3\u91ca\u7f51\u4e0a\u6709\u4e00\u5927\u5806\uff0c\u5728\u8fd9\u91cc\u6211\u89e3\u91ca\u7684\u901a\u4fd7\u4e00\u4e9b\uff0c\u6700\u8d77\u7801\u8ba9\u4f60\u5728CTF\u4e2d\u591f\u7528\u5373\u53ef<\/p>\n\n\n\n<p>\u7b80\u5355\u6765\u8bf4\uff0c\u7cfb\u7edf\u8c03\u7528\uff08\u8fd9\u662f\u4e2a\u540d\u8bcd\u54e6\uff09\u5c31\u662f\u7a0b\u5e8f\u8c03\u7528\u5e95\u5c42\u8bbe\u5907\uff0c\u6bd4\u5982\u663e\u793a\u5c4f\u7b49\u7b49\u7684\u6c47\u7f16\u547d\u4ee4\uff0c\u6bd4\u5982\u4f60\u6240\u719f\u77e5\u7684printf\u51fd\u6570\uff0c\u6700\u7ec8\u8981\u8c03\u7528write\u8fd9\u4e2a\u7cfb\u7edf\u8c03\u7528\uff0c\u6765\u628a\u4f60\u60f3\u8f93\u51fa\u7684\u4e1c\u897f\u6253\u5370\u5230\u5c4f\u5e55\u4e0a\uff0cscanf\u51fd\u6570\uff0c\u6700\u91cd\u8981\u8c03\u7528read\u8fd9\u4e2a\u7cfb\u7edf\u8c03\u7528\uff0c\u628a\u4f60\u8f93\u5165\u7684\u4e1c\u897f\u653e\u5230\u7a0b\u5e8f\u91cc\uff0c\u5982\u679c\u6ca1\u6709\u8fd9\u4e9b\u7cfb\u7edf\u8c03\u7528\u4f5c\u4e3a\u4ea4\u4e92\u63a5\u53e3\uff0c\u4f60\u8be5\u5982\u4f55\u548c\u7535\u8111\u505a\u4ea4\u4e92\u5462\uff1f<\/p>\n\n\n\n<p>\u6240\u4ee5\uff0c\u6240\u8c13\u7cfb\u7edf\u8c03\u7528\uff0c\u5c31\u662f\u8c03\u7528\u7cfb\u7edf\u8bbe\u5907\u7684\u63a5\u53e3\uff0c\u4ed6\u548c\u51fd\u6570\u5f88\u50cf\uff0c\u90fd\u9700\u8981\u4f20\u5165\u53c2\u6570\uff0c\u5728x86\u4e2d\uff0c\u901a\u8fc7\u6c47\u7f16\u6307\u4ee4\u201cint 0x80\u201d\u6765\u5b9e\u73b0\uff0c\u5728x86-64\u4e2d\uff0c\u901a\u8fc7\u6c47\u7f16\u6307\u4ee4\u201csyscall\u201d\u6765\u5b9e\u73b0<\/p>\n\n\n\n<p>\u90a3\u5982\u4f55\u533a\u5206\u4e0d\u540c\u7684\u7cfb\u7edf\u8c03\u7528\u5462\uff1f\u4e8e\u662f\u7cfb\u7edf\u8c03\u7528\u53f7\u7684\u6982\u5ff5\u5e94\u8fd0\u800c\u751f\uff0c\u7b80\u800c\u8a00\u4e4b\u5c31\u662f\u5bf9\u4e0d\u540c\u7684\u7cfb\u7edf\u8c03\u7528\u7f16\u4e2a\u53f7\uff0c\u8fd9\u6837\u8c03\u7528\u7684\u65f6\u5019\u76f4\u63a5\u8bf4\u4e00\u4e0b\u7f16\u53f7\uff0c\u7cfb\u7edf\u5c31\u77e5\u9053\u4f60\u60f3\u8c03\u7528\u54ea\u4e2a\u4e86\uff0c\u6211\u7684<a href=\"http:\/\/39.104.51.85\/index.php\/2024\/06\/24\/linux%e7%b3%bb%e7%bb%9f%e8%b0%83%e7%94%a8%e5%8f%b7\/\">\u53e6\u4e00\u7bc7\u535a\u5ba2<\/a>\u6536\u96c6\u4e8632\u4f4d\u548c64\u4f4d\u7684\u7cfb\u7edf\u8c03\u7528\u53f7\uff0c\u8fd9\u91cc\u5c55\u793a\u51e0\u4e2a\u5e38\u7528\u7684\u5427\uff08\u4ee5\u4e0b\u90fd\u662f64\u4f4d\u7a0b\u5e8f\u7684\u7cfb\u7edf\u8c03\u7528\u53f7\uff09<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#define __NR_read 0\n#define __NR_write 1\n#define __NR_open 2\n#define __NR_close 3\n#define __NR_execve 59<\/code><\/pre>\n\n\n\n<p>read\u662f\u8bfb\u6570\u636e\u7684\u7cfb\u7edf\u8c03\u7528\uff0cwrite\u662f\u5199\u6570\u636e\u7684\u7cfb\u7edf\u8c03\u7528\uff0copen\u3001close\u662f\u6253\u5f00\/\u5173\u95ed\u6587\u4ef6\u7684\u7cfb\u7edf\u8c03\u7528\uff0c\u800cexecve\uff0c\u662f\u6267\u884c\u7cfb\u7edf\u547d\u4ee4\u7684\u7cfb\u7edf\u8c03\u7528\uff0c\u4e5f\u662fsystem\u51fd\u6570\u4f1a\u8c03\u7528\u7684\u7cfb\u7edf\u8c03\u7528<\/p>\n\n\n\n<p>\u8981\u6ce8\u610f\uff0c\u5728\u6267\u884csyscall\u6216\u8005int 0x80\u4e4b\u524d\uff0c\u8981\u628a\u7cfb\u7edf\u8c03\u7528\u53f7\u653e\u5230rax\/eax\u5bc4\u5b58\u5668\u91cc\uff0c\u8fd9\u6837\u7cfb\u7edf\u5c31\u77e5\u9053\u4f60\u8981\u8c03\u7528\u54ea\u4e2a\u7cfb\u7edf\u8c03\u7528\u4e86\uff0c<mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-red-color\">rax\u5b58\u653e\u7cfb\u7edf\u8c03\u7528\u53f7<\/mark>\uff0c\u8fd9\u4e2a\u5f88\u91cd\u8981\u54e6\uff01<\/p>\n\n\n\n<p>\u81f3\u4e8e\u5176\u4ed6\u53c2\u6570\u561b\uff0c\u5c31\u4ecd\u7136\u6309\u7167rdi\uff0crsi\uff0crdx\uff0crcx\uff0cr8\uff0cr9\u7684\u987a\u5e8f\u6765\u55bd\uff0c\u5177\u4f53\u7684\u53c2\u6570\u6709\u54ea\u4e9b\uff0c\u6839\u636e\u4e0d\u540c\u7684\u51fd\u6570\u81ea\u5df1\u67e5\u627e\uff0c\u5e38\u89c1\u7684\u6709<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>read(int fd, void *buf, size_t count);<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><code>fd<\/code> (\u6587\u4ef6\u63cf\u8ff0\u7b26)<\/strong>:\n<ul class=\"wp-block-list\">\n<li>\u8868\u793a\u8981\u8bfb\u53d6\u7684\u6587\u4ef6\u3001\u7ba1\u9053\u6216\u5176\u4ed6 I\/O \u6d41\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/li>\n\n\n\n<li>\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f\u4e00\u4e2a\u975e\u8d1f\u6574\u6570\uff0c\u901a\u5e38\u662f\u901a\u8fc7\u00a0<code>open<\/code>\u00a0\u6216\u00a0<code>socket<\/code>\u00a0\u7b49\u51fd\u6570\u83b7\u5f97\u7684\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong><code>buf<\/code> (\u7f13\u51b2\u533a)<\/strong>:\n<ul class=\"wp-block-list\">\n<li>\u6307\u5411\u5b58\u50a8\u8bfb\u53d6\u6570\u636e\u7684\u5185\u5b58\u533a\u57df\u7684\u6307\u9488\u3002<\/li>\n\n\n\n<li>\u6570\u636e\u5c06\u88ab\u5199\u5165\u5230\u8fd9\u4e2a\u7f13\u51b2\u533a\u4e2d\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong><code>count<\/code> (\u8bfb\u53d6\u5b57\u8282\u6570)<\/strong>:\n<ul class=\"wp-block-list\">\n<li>\u8868\u793a\u5e0c\u671b\u4ece\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e2d\u8bfb\u53d6\u7684\u6700\u5927\u5b57\u8282\u6570\u3002<\/li>\n\n\n\n<li>\u5982\u679c\u00a0<code>count<\/code>\u00a0\u4e3a 0\uff0c<code>read<\/code>\u00a0\u4f1a\u7acb\u5373\u8fd4\u56de 0\uff0c\u4e0d\u8fdb\u884c\u4efb\u4f55\u5b9e\u9645\u8bfb\u53d6\u64cd\u4f5c\u3002<\/li>\n\n\n\n<li>\u5982\u679c\u00a0<code>count<\/code>\u00a0\u5927\u4e8e\u53ef\u7528\u7a7a\u95f4\uff0c<code>read<\/code>\u00a0\u53ea\u4f1a\u8bfb\u53d6\u5b9e\u9645\u53ef\u7528\u7684\u6570\u636e\u91cf\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p>\u8bfb\u53d6\u6210\u529f\u5219\u8fd4\u56de\u8bfb\u53d6\u7684\u5b57\u8282\u6570\uff0c\u5931\u8d25\u8fd4\u56de-1<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>write(int fd, const void *buf, size_t count);<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><code>fd<\/code> (\u6587\u4ef6\u63cf\u8ff0\u7b26)<\/strong>:\n<ul class=\"wp-block-list\">\n<li>\u8868\u793a\u8981\u5199\u5165\u7684\u76ee\u6807\u6587\u4ef6\u3001\u7ba1\u9053\u6216\u5176\u4ed6 I\/O \u6d41\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/li>\n\n\n\n<li>\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f\u4e00\u4e2a\u975e\u8d1f\u6574\u6570\uff0c\u901a\u5e38\u662f\u901a\u8fc7\u00a0<code>open<\/code>\u00a0\u6216\u00a0<code>socket<\/code>\u00a0\u7b49\u51fd\u6570\u83b7\u5f97\u7684\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong><code>buf<\/code> (\u7f13\u51b2\u533a)<\/strong>:\n<ul class=\"wp-block-list\">\n<li>\u6307\u5411\u5305\u542b\u8981\u5199\u5165\u6570\u636e\u7684\u5185\u5b58\u533a\u57df\u7684\u6307\u9488\u3002<\/li>\n\n\n\n<li>\u6570\u636e\u5c06\u4ece\u8fd9\u4e2a\u7f13\u51b2\u533a\u4e2d\u8bfb\u53d6\u5e76\u5199\u5165\u5230\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e2d\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong><code>count<\/code> (\u5199\u5165\u5b57\u8282\u6570)<\/strong>:\n<ul class=\"wp-block-list\">\n<li>\u8868\u793a\u5e0c\u671b\u5199\u5165\u7684\u6700\u5927\u5b57\u8282\u6570\u3002<\/li>\n\n\n\n<li>\u5982\u679c\u00a0<code>count<\/code>\u00a0\u5927\u4e8e\u53ef\u7528\u7a7a\u95f4\uff0c<code>write<\/code>\u00a0\u53ea\u4f1a\u5199\u5165\u5b9e\u9645\u53ef\u80fd\u7684\u6570\u91cf\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p>\u8f93\u51fa\u6210\u529f\u5219\u8fd4\u56de\u8f93\u51fa\u7684\u5b57\u8282\u6570\uff0c\u5426\u5219\u8fd4\u56de-1<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int open(const char *pathname, int flags);\nint open(const char *pathname, int flags, mode_t mode);  \/\/ \u521b\u5efa\u65b0\u6587\u4ef6\u65f6\u9700\u8981\u6307\u5b9a\u6743\u9650<\/code><\/pre>\n\n\n\n<p>open\u6709\u4e24\u79cd\u91cd\u8f7d\uff0c\u901a\u5e38\u53ea\u9700\u8981\u6307\u5b9a\u6587\u4ef6\u8def\u5f84\u548c\u6253\u5f00\u6a21\u5f0f\uff0c\u5373\u4f7f\u7528\u7b2c\u4e00\u79cd\u65b9\u6cd5<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><code>pathname<\/code> (\u6587\u4ef6\u8def\u5f84)<\/strong>:\n<ul class=\"wp-block-list\">\n<li>\u6307\u5411\u6587\u4ef6\u8def\u5f84\u7684\u5b57\u7b26\u4e32\u3002<\/li>\n\n\n\n<li>\u53ef\u4ee5\u662f\u7edd\u5bf9\u8def\u5f84\uff08\u5982\u00a0<code>\/home\/user\/file.txt<\/code>\uff09\u6216\u76f8\u5bf9\u8def\u5f84\uff08\u5982\u00a0<code>.\/file.txt<\/code>\uff09\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong><code>flags<\/code> (\u6253\u5f00\u6a21\u5f0f)<\/strong>:\n<ul class=\"wp-block-list\">\n<li>\u6307\u5b9a\u5982\u4f55\u6253\u5f00\u6587\u4ef6\u3002\u5e38\u89c1\u7684\u6807\u5fd7\u5305\u62ec\uff1a\n<ul class=\"wp-block-list\">\n<li><code>O_RDONLY<\/code>\uff1a\u53ea\u8bfb\u6a21\u5f0f\u3002<\/li>\n\n\n\n<li><code>O_WRONLY<\/code>\uff1a\u53ea\u5199\u6a21\u5f0f\u3002<\/li>\n\n\n\n<li><code>O_RDWR<\/code>\uff1a\u8bfb\u5199\u6a21\u5f0f\u3002<\/li>\n\n\n\n<li><code>O_CREAT<\/code>\uff1a\u5982\u679c\u6587\u4ef6\u4e0d\u5b58\u5728\uff0c\u5219\u521b\u5efa\u5b83\u3002<\/li>\n\n\n\n<li><code>O_EXCL<\/code>\uff1a\u4e0e\u00a0<code>O_CREAT<\/code>\u00a0\u4e00\u8d77\u4f7f\u7528\uff0c\u786e\u4fdd\u6587\u4ef6\u4e0d\u5b58\u5728\u65f6\u624d\u521b\u5efa\uff08\u907f\u514d\u8986\u76d6\uff09\u3002<\/li>\n\n\n\n<li><code>O_TRUNC<\/code>\uff1a\u5982\u679c\u6587\u4ef6\u5df2\u5b58\u5728\uff0c\u5219\u5c06\u5176\u957f\u5ea6\u622a\u65ad\u4e3a 0\u3002<\/li>\n\n\n\n<li><code>O_APPEND<\/code>\uff1a\u6bcf\u6b21\u5199\u5165\u65f6\u5c06\u6570\u636e\u8ffd\u52a0\u5230\u6587\u4ef6\u672b\u5c3e\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u8fd9\u4e9b\u6807\u5fd7\u53ef\u4ee5\u901a\u8fc7\u6309\u4f4d\u6216 (<code>|<\/code>) \u7ec4\u5408\u4f7f\u7528\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong><code>mode<\/code> (\u6587\u4ef6\u6743\u9650)<\/strong>:\n<ul class=\"wp-block-list\">\n<li>\u5f53\u4f7f\u7528\u00a0<code>O_CREAT<\/code>\u00a0\u6807\u5fd7\u521b\u5efa\u65b0\u6587\u4ef6\u65f6\uff0c\u5fc5\u987b\u63d0\u4f9b\u8be5\u53c2\u6570\u6765\u6307\u5b9a\u6587\u4ef6\u6743\u9650\u3002<\/li>\n\n\n\n<li>\u6743\u9650\u901a\u5e38\u7528\u516b\u8fdb\u5236\u8868\u793a\uff0c\u4f8b\u5982\uff1a\n<ul class=\"wp-block-list\">\n<li><code>S_IRUSR<\/code>\u00a0(0400)\uff1a\u6587\u4ef6\u6240\u6709\u8005\u5177\u6709\u8bfb\u6743\u9650\u3002<\/li>\n\n\n\n<li><code>S_IWUSR<\/code>\u00a0(0200)\uff1a\u6587\u4ef6\u6240\u6709\u8005\u5177\u6709\u5199\u6743\u9650\u3002<\/li>\n\n\n\n<li><code>S_IXUSR<\/code>\u00a0(0100)\uff1a\u6587\u4ef6\u6240\u6709\u8005\u5177\u6709\u6267\u884c\u6743\u9650\u3002<\/li>\n\n\n\n<li>\u5e38\u89c1\u7ec4\u5408\uff1a<code>0644<\/code>\uff08\u6240\u6709\u8005\u53ef\u8bfb\u5199\uff0c\u5176\u4ed6\u7528\u6237\u53ea\u8bfb\uff09\u6216\u00a0<code>0755<\/code>\uff08\u6240\u6709\u8005\u53ef\u8bfb\u5199\u6267\u884c\uff0c\u5176\u4ed6\u7528\u6237\u53ef\u8bfb\u6267\u884c\uff09\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><code>O_RDONLY<\/code>\u00a0\u7684\u503c\u4e3a 0<\/strong>\u3002<\/li>\n\n\n\n<li><strong><code>O_WRONLY<\/code>\u00a0\u7684\u503c\u4e3a 1<\/strong>\u3002<\/li>\n\n\n\n<li><strong><code>O_RDWR<\/code>\u00a0\u7684\u503c\u4e3a 2<\/strong>\u3002<\/li>\n<\/ul>\n\n\n\n<p>flags\u4e00\u822c\u8bbe\u7f6e\u4e3a2\u62164<\/p>\n\n\n\n<p>\u8fd9\u91cc\u4f60\u53ef\u80fd\u8981\u95ee\uff0c\u4ec0\u4e48\u662f\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u4e13\u4e1a\u89e3\u91ca\u81ea\u884c\u767e\u5ea6\uff0c\u901a\u4fd7\u89e3\u91ca\u8bf7\u770b\u4e0b\u6587<\/p>\n\n\n\n<p>\u7b80\u5355\u6765\u8bf4\uff0c\u5982\u679c\u4f60\u7684\u7a0b\u5e8f\u6253\u5f00\u4e86\u5f88\u591a\u6587\u4ef6\uff0c\u90a3\u4e48\u4e3a\u4e86\u540e\u7eed\u65b9\u4fbf\u67e5\u627e\uff0c\u6211\u4eec\u7ed9\u6240\u6709\u6253\u5f00\u7684\u6587\u4ef6\u7f16\u4e2a\u53f7\uff0c\u540e\u7eed\u6839\u636e\u8fd9\u4e2a\u53f7\u53bb\u7d22\u5f15\uff0c\u5c31\u80fd\u5feb\u901f\u7684\u627e\u5230\u4f60\u6253\u5f00\u7684\u6587\u4ef6\uff0c\u90a3\u4e48\u8fd9\u4e2a\u7d22\u5f15\u4ece0\u5f00\u59cb\u6392\uff0c0,1,2\u5206\u522b\u5bf9\u5e94\u6807\u51c6\u8f93\u5165\uff0c\u6807\u51c6\u8f93\u51fa\uff0c\u6807\u51c6\u9519\u8bef\uff0c\u540e\u7eed\u6253\u5f00\u7684\u5916\u90e8\u6587\u4ef6\u63cf\u8ff0\u7b26\u4f9d\u6b21\u4e3a3,4,5\u2026\u2026<\/p>\n\n\n\n<p>open\u6253\u5f00\u6587\u4ef6\u6210\u529f\u5219\u8fd4\u56de\u8fd9\u4e2a\u6587\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<\/p>\n\n\n\n<p>\u6240\u4ee5linux\u4e2d\uff0c\u5176\u5b9e\u4f60\u7684\u8f93\u5165\u8f93\u51fa\uff0c\u4e5f\u88ab\u770b\u505a\u4e86\u6587\u4ef6<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>close(int fd);<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><code>fd<\/code>\u00a0(\u6587\u4ef6\u63cf\u8ff0\u7b26)<\/strong>:\n<ul class=\"wp-block-list\">\n<li>\u8981\u5173\u95ed\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/li>\n\n\n\n<li>\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f\u4e00\u4e2a\u975e\u8d1f\u6574\u6570\uff0c\u901a\u5e38\u662f\u901a\u8fc7\u00a0<code>open<\/code>\u3001<code>socket<\/code>\u00a0\u6216\u5176\u4ed6 I\/O \u51fd\u6570\u83b7\u5f97\u7684\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>execve(const char *pathname, char *const argv&#91;], char *const envp&#91;]);<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><code>pathname<\/code> (\u7a0b\u5e8f\u8def\u5f84)<\/strong>:\n<ul class=\"wp-block-list\">\n<li>\u6307\u5411\u53ef\u6267\u884c\u6587\u4ef6\u8def\u5f84\u7684\u5b57\u7b26\u4e32\u3002<\/li>\n\n\n\n<li>\u53ef\u4ee5\u662f\u7edd\u5bf9\u8def\u5f84\uff08\u5982\u00a0<code>\/bin\/ls<\/code>\uff09\u6216\u76f8\u5bf9\u8def\u5f84\uff08\u5982\u00a0<code>.\/a.out<\/code>\uff09\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong><code>argv<\/code> (\u53c2\u6570\u5217\u8868)<\/strong>:\n<ul class=\"wp-block-list\">\n<li>\u4e00\u4e2a\u6307\u5411\u5b57\u7b26\u4e32\u6570\u7ec4\u7684\u6307\u9488\uff0c\u8868\u793a\u4f20\u9012\u7ed9\u65b0\u7a0b\u5e8f\u7684\u53c2\u6570\u3002<\/li>\n\n\n\n<li>\u7b2c\u4e00\u4e2a\u53c2\u6570\u901a\u5e38\u662f\u53ef\u6267\u884c\u6587\u4ef6\u7684\u540d\u5b57\uff08\u60ef\u4f8b\uff0c\u4f46\u4e0d\u662f\u5f3a\u5236\u8981\u6c42\uff09\u3002<\/li>\n\n\n\n<li>\u6570\u7ec4\u7684\u6700\u540e\u4e00\u4e2a\u5143\u7d20\u5fc5\u987b\u4e3a\u00a0<code>NULL<\/code>\uff0c\u4ee5\u6807\u8bb0\u53c2\u6570\u5217\u8868\u7684\u7ed3\u675f\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong><code>envp<\/code> (\u73af\u5883\u53d8\u91cf\u5217\u8868)<\/strong>:\n<ul class=\"wp-block-list\">\n<li>\u4e00\u4e2a\u6307\u5411\u5b57\u7b26\u4e32\u6570\u7ec4\u7684\u6307\u9488\uff0c\u8868\u793a\u4f20\u9012\u7ed9\u65b0\u7a0b\u5e8f\u7684\u73af\u5883\u53d8\u91cf\u3002<\/li>\n\n\n\n<li>\u6bcf\u4e2a\u5b57\u7b26\u4e32\u7684\u683c\u5f0f\u4e3a\u00a0<code>\"VAR=value\"<\/code>\u3002<\/li>\n\n\n\n<li>\u6570\u7ec4\u7684\u6700\u540e\u4e00\u4e2a\u5143\u7d20\u4e5f\u5fc5\u987b\u4e3a\u00a0<code>NULL<\/code>\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p>\u8fd9\u91cc\u8981\u63d0\u9192\u7684\u662f\u60f3\u62ffshell\u7684\u65f6\u5019<mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-red-color\">\u540e\u9762\u4e24\u4e2a\u53c2\u6570\u5fc5\u987b\u8bbe\u7f6e\u4e3a0<\/mark>\uff0c\u5373\u6267\u884cexecve(&#8220;\/bin\/sh&#8221;,0,0);\u8fd9\u5f88\u91cd\u8981<\/p>\n\n\n\n<p>\u6211\u4eec\u6765\u770b\u51e0\u4e2a\u4f8b\u5b50<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1read0buf0x40\"><\/span>1.read(0,buf,0x40)<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/\u8bbe\u7f6e\u7cfb\u7edf\u8c03\u7528\u53f7\u4e3a 0 (read)\nmov rax, 0\n\/\/\u8bbe\u7f6e\u7b2c\u4e00\u4e2a\u53c2\u6570\uff1a\u6587\u4ef6\u63cf\u8ff0\u7b26 (\u6807\u51c6\u8f93\u5165 0)\nmov rdi, 0\n\/\/\u8bbe\u7f6e\u7b2c\u4e8c\u4e2a\u53c2\u6570\uff1a\u7f13\u51b2\u533a\u5730\u5740\nlea rsi, &#91;buf] \/\/\u4f7f\u7528 lea \u6307\u4ee4\u52a0\u8f7d buf \u7684\u5730\u5740\n\/\/\u8bbe\u7f6e\u7b2c\u4e09\u4e2a\u53c2\u6570\uff1a\u8bfb\u53d6\u5b57\u8282\u6570 (40)\nmov rdx, 0x40\n\/\/\u6267\u884c\u7cfb\u7edf\u8c03\u7528\nsyscall<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2execve%E2%80%9Cbinsh%E2%80%9D00%EF%BC%88%E8%BF%99%E9%87%8C%E5%81%87%E8%AE%BEbinsh%E5%AD%97%E7%AC%A6%E4%B8%B2%E5%B7%B2%E7%BB%8F%E5%86%99%E5%85%A5%E4%BA%860xdeadbeef%E8%BF%99%E4%B8%AA%E5%9C%B0%E5%9D%80%EF%BC%89\"><\/span>2.execve(&#8220;\/bin\/sh&#8221;,0,0)\uff08\u8fd9\u91cc\u5047\u8bbe\/bin\/sh\u5b57\u7b26\u4e32\u5df2\u7ecf\u5199\u5165\u4e860xdeadbeef\u8fd9\u4e2a\u5730\u5740\uff09<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/\u8bbe\u7f6e\u7cfb\u7edf\u8c03\u7528\u53f7\u4e3a 59 (execve)\nmov rax, 59\n\/\/\u8bbe\u7f6e\u7b2c\u4e00\u4e2a\u53c2\u6570\/bin\/sh\nmov rdi,0xdeadbeef \n\/\/\u8bbe\u7f6e\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e3a0\uff0c\u8fd9\u91cc\u6211\u7528mov\u7684\u65b9\u5f0f\u5b9e\u73b0\uff0c\u4e0b\u9762\u7684xor\u4e5f\u53ef\u4ee5\u54e6\uff0c\u81ea\u7531\u9009\u62e9\nmov rsi,0\n\/\/\u8bbe\u7f6e\u7b2c\u4e09\u4e2a\u53c2\u6570\u4e3a0\uff0cxor\u6307\u4ee4\u662f\u5f88\u5e38\u89c1\u7684\u8bbe\u7f6e0\u7684\u6307\u4ee4\nxor rdx,rdx\n\/\/\u6267\u884c\u7cfb\u7edf\u8c03\u7528\nsyscall<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"shellcode\"><\/span>shellcode<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u770b\u5230\u8fd9\u4e86\uff1f\u54ce\u54df\uff0c\u4e0d\u9519\u561b<\/p>\n\n\n\n<p>\u96be\u9053\u4f60\u6ca1\u610f\u8bc6\u5230\u4f60\u5df2\u7ecf\u770b\u61c2\u4e86shellcode\u5417\uff1f<\/p>\n\n\n\n<p>\u6ca1\u9519\uff0cshellcode\u5f88\u7b80\u5355\uff0c\u5c31\u662f\u5229\u7528\u6c47\u7f16\u4ee3\u7801\u6765\u6267\u884c\u7cfb\u7edf\u8c03\u7528\uff0c\u4ece\u800c\u5b9e\u73b0\u653b\u51fb<\/p>\n\n\n\n<p>\u53ea\u4e0d\u8fc7\u2026\u2026<\/p>\n\n\n\n<p>\u5728\u6b63\u5e38\u60c5\u51b5\u4e0b\uff0c\u7a0b\u5e8f\u90fd\u4f1a\u5f00\u542fNX\u4fdd\u62a4\uff0c\u5373\u5806\u6808\u4e0d\u53ef\u6267\u884c\u4fdd\u62a4\uff0c\u56e0\u6b64\uff0c\u5927\u591a\u6570\u65f6\u5019\u4f60\u7684shellcode\u80fd\u5199\u5165\u7684\u4f4d\u7f6e\uff0c\u6bd4\u5982\u6808\u6216\u8005bss\u6bb5\uff0c\u4ed6\u4eec\u662f\u6ca1\u6709\u53ef\u6267\u884c\u6743\u9650\u7684\uff0c\u6240\u4ee5\u4e00\u822c\u9898\u76ee\u8981\u8003\u5bdfshellcode\u7684\u8bdd\uff0c\u4f1a\u5173\u95edNX\u4fdd\u62a4\uff0c\u6216\u8005\u81ea\u5df1\u7f16\u5199\u4e00\u4e2ashellcode\u51fd\u6570\uff0c\u4e13\u95e8\u7528\u4e8e\u6267\u884c\u4f60\u7684shellcode\uff0c\u4e5f\u6709\u53ef\u80fd\u5229\u7528mmap\u5206\u914d\u4e00\u6bb5\u6709\u53ef\u6267\u884c\u6743\u9650\u7684\u7a7a\u95f4\uff0c\u5f53\u7136\u8fd8\u6709\u4e00\u4e2a\u6740\u6c14\uff0c\u5c31\u662fmprotect\uff0c\u8fd9\u4e5f\u662f\u4e00\u4e2a\u7cfb\u7edf\u8c03\u7528\uff0c\u53ef\u4ee5\u6539\u53d8\u5185\u5b58\u7684\u6743\u9650\uff0c\u611f\u5174\u8da3\u7684\u81ea\u5df1\u53bb\u67e5\u4e00\u4e0b\u5427\uff0c\u8fd9\u91cc\u5c31\u4e0d\u5c55\u5f00\u53d9\u8ff0\u4e86<\/p>\n\n\n\n<p>\u5728pwntools\u91cc\uff0c\u5df2\u7ecf\u96c6\u6210\u597d\u4e86shellcode\u7684\u751f\u6210\u5de5\u5177\u2014\u2014shellcraft<\/p>\n\n\n\n<p>\u901a\u5e38\u6211\u4eec\u4f1a\u5229\u7528shellcraft.sh()\u6765\u81ea\u52a8\u751f\u6210get shell\u7684shellcode\uff0c\u518d\u5229\u7528asm\u5c06shellcode\u8f6c\u5316\u4e3a\u6bd4\u7279\u6d41<\/p>\n\n\n\n<p>\u5373shellcode=asm(shellcraft.sh())<\/p>\n\n\n\n<p>\u5e38\u89c1\u7684\u8fd8\u6709shellcraft.cat(&#8216;flag&#8217;),shellcraft.read(fd,buf,size)\u7b49\u7b49\uff0c\u5176\u539f\u7406\u90fd\u662f\u751f\u6210\u4e86\u4e00\u6bb5shellcode\u8fdb\u884c\u7cfb\u7edf\u8c03\u7528<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E6%B2%99%E7%AE%B1%EF%BC%88orw%EF%BC%89\"><\/span>\u6c99\u7bb1\uff08orw\uff09<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u5982\u679c\u4f60\u628a\u524d\u9762\u4e24\u4e2a\u677f\u5757\u90fd\u5f04\u61c2\u4e86\uff0c\u90a3\u4e48\u606d\u559c\u4f60\uff0c\u4f60\u53ef\u4ee5\u5b66\u4e60\u6c99\u7bb1\u4e0eorw\u4e86<\/p>\n\n\n\n<p>\u9996\u5148\uff0c\u4ec0\u4e48\u662f\u6c99\u7bb1\uff1f<\/p>\n\n\n\n<p>\u540c\u6837\u7684\uff0c\u4e13\u4e1a\u5b9a\u4e49\u81ea\u884c\u767e\u5ea6\uff0c\u8fd9\u91cc\u53ea\u8bf4\u901a\u4fd7\u7248<\/p>\n\n\n\n<p>\u7b80\u800c\u8a00\u4e4b\uff0c\u6c99\u7bb1\u5206\u4e24\u79cd\uff0c\u767d\u540d\u5355\u548c\u9ed1\u540d\u5355\uff0c\u767d\u540d\u5355\u5c31\u662f\u53ea\u5141\u8bb8\u4f60\u8c03\u7528\u67d0\u4e9b\u7cfb\u7edf\u8c03\u7528\uff0c\u9ed1\u540d\u5355\u5c31\u662f\u4e0d\u5141\u8bb8\u4f60\u8c03\u7528\u67d0\u4e9b\u7cfb\u7edf\u8c03\u7528\uff0c\u521d\u5b66\u9636\u6bb5\u901a\u5e38\u767d\u540d\u5355\u5141\u8bb8\u7684\u8c03\u7528\u662fopen\uff0cread\uff0cwrite\uff0c\u9ed1\u540d\u5355\u7981\u6b62\u7684\u662fexecve\u51fd\u6570\uff0c\u8fd9\u4e5f\u5c31\u610f\u5473\u7740\u4f60\u65e0\u6cd5\u76f4\u63a5\u83b7\u5f97\u7a0b\u5e8f\u7684shell\u6743\u9650<\/p>\n\n\n\n<p>\u68c0\u6d4b\u6c99\u7bb1\u7684\u5de5\u5177\u53ebsecccomp-tools\uff0c\u5b89\u88c5\u65b9\u6cd5\u5728<a href=\"http:\/\/39.104.51.85\/index.php\/2025\/01\/07\/%e4%bb%8e%e9%9b%b6%e6%90%ad%e5%bb%ba%e4%b8%80%e4%b8%aaiot-pwn%e7%8e%af%e5%a2%83\/\">\u8fd9\u7bc7\u6587\u7ae0<\/a>\u91cc\u9762\u6709<\/p>\n\n\n\n<p>\u4f7f\u7528\u65b9\u6cd5\uff1aseccomp-tools dump .\/\u7a0b\u5e8f\u540d<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E4%B8%80%E4%B8%AA%E5%85%B8%E5%9E%8B%E7%9A%84%E7%99%BD%E5%90%8D%E5%8D%95%E6%B2%99%E7%AE%B1%E5%A6%82%E4%B8%8B\"><\/span>\u4e00\u4e2a\u5178\u578b\u7684\u767d\u540d\u5355\u6c99\u7bb1\u5982\u4e0b<span class=\"ez-toc-section-end\"><\/span><\/h4>\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\/2025\/02\/image-1024x641.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" width=\"1024\" height=\"641\" data-original=\"http:\/\/39.104.51.85\/wp-content\/uploads\/2025\/02\/image-1024x641.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-622\"  sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<p>\u9605\u8bfb\u65b9\u6cd5\u548c\u8bfbc\u8bed\u8a00\u7684\u4ee3\u7801\u4e00\u6837\uff0cif\u600e\u4e48\u600e\u4e48\u6837\u90a3\u4e48goto\u54ea\u91cc\uff0c\u8fd9\u91cc\u53ef\u4ee5\u770b\u5230if\uff08A==open\uff09\u90a3\u4e48goto \u7b2c17\u884c\uff0c\u4e5f\u662f\u5c31allow\uff0c\u6240\u4ee5\u5141\u8bb8\u8c03\u7528open\uff0c\u5176\u4ed6\u51fd\u6570\u540c\u7406<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E4%B8%80%E4%B8%AA%E5%85%B8%E5%9E%8B%E7%9A%84%E9%BB%91%E5%90%8D%E5%8D%95%E6%B2%99%E7%AE%B1%E5%A6%82%E4%B8%8B\"><\/span>\u4e00\u4e2a\u5178\u578b\u7684\u9ed1\u540d\u5355\u6c99\u7bb1\u5982\u4e0b<span class=\"ez-toc-section-end\"><\/span><\/h4>\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\/2025\/02\/image-1.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" width=\"999\" height=\"322\" data-original=\"http:\/\/39.104.51.85\/wp-content\/uploads\/2025\/02\/image-1.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-623\"  sizes=\"(max-width: 999px) 100vw, 999px\" \/><\/div><\/figure>\n\n\n\n<p>\u663e\u800c\u6613\u89c1\uff0c\u5982\u679c\u8c03\u7528\u7684\u662fexecve\uff0c\u90a3\u4e48\u5c31\u4f1aKILL\uff0c\u4e5f\u5c31\u662f\u4e0d\u5141\u8bb8<\/p>\n\n\n\n<p>\u597d\u4e86\uff0c\u65e0\u8bba\u662f\u767d\u540d\u5355\u8fd8\u662f\u9ed1\u540d\u5355\uff0c\u90fd\u65e0\u6cd5get shell\uff0c\u90a3\u4e48\u6211\u4eec\u8be5\u600e\u4e48\u83b7\u5f97shell\u5462\uff1f\u4e8e\u662f\uff0corw\u8fd9\u79cd\u4e13\u95e8\u5e94\u5bf9ctf\u7684\u65b9\u6cd5\u5e94\u8fd0\u800c\u751f<\/p>\n\n\n\n<p>o\u5bf9\u5e94\u7684\u662fopen\uff0cr\u5bf9\u5e94\u7684\u662fread\uff0cw\u5bf9\u5e94\u7684\u662fwrite<\/p>\n\n\n\n<p>\u5982\u679c\u65e0\u6cd5getshell\uff0c\u90a3\u6211\u4eec\u5c31\u53ef\u4ee5\u5c06flag\u8fd9\u4e2a\u6587\u4ef6\u8bfb\u5165\u5230\u5185\u5b58\u4e2d\uff0c\u518d\u5c06\u5b83\u8f93\u51fa\u5230\u663e\u793a\u5c4f\u4e0a\uff0c\u8fd9\u5c31\u662forw<\/p>\n\n\n\n<p>\u6240\u4ee5\u6211\u4eec\u8981\u5148open(&#8220;flag&#8221;)\uff08\u9700\u8981\u63d0\u524d\u5728\u53ef\u63a7\u5730\u5740\u8bfb\u5165\u201cflag\u201d\u8fd9\u4e2a\u5b57\u7b26\u4e32\u54e6\uff09\uff0c\u7136\u540eread(3,buf,0x40)\uff0c\u6ce8\u610f\u4e86\uff0c\u8fd9\u91cc\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f3\uff0c\u4e3a\u4ec0\u4e48\u5462\uff1f\u524d\u9762\u8bb2\u8fc7\u4e86\uff0c\u540e\u7eed\u6253\u5f00\u7684\u6587\u4ef6\uff0c\u5176\u6587\u4ef6\u63cf\u8ff0\u7b26\u4ece3\u5f00\u59cb\u6392\uff0c\u4e8e\u662f\u6211\u4eec\u4eceflag\u8fd9\u4e2a\u6587\u4ef6\u4e2d\uff0c\u8bfb\u53d6\u4e860x40\uff08\u901a\u5e38flag\u7684\u957f\u5ea6\u4e0d\u4f1a\u8d85\u8fc7\u8fd9\u4e2a\u6570\u7684\uff09\u7684\u6570\u636e\u5230buf\u8fd9\u4e2a\u5730\u5740\u4e0a\uff0c\u4e00\u822c\u800c\u8a00\uff0cbuf\u53ef\u4ee5\u518d\u6808\u4e0a\uff0c\u4e5f\u53ef\u4ee5\u5728bss\u4e0a\uff0c\u53ea\u8981\u53ef\u8bfb\u53ef\u5199\u5373\u53ef\u3002\u6700\u540e\uff0c\u8c03\u7528write(1,buf,0x40)\uff0c\u5c06\u521a\u624d\u5199\u5165\u7684flag\u8f93\u51fa\u5230\u663e\u793a\u5c4f\u4e0a\uff0c\u4e8e\u662f\u5c31\u83b7\u5f97\u4e86flag<\/p>\n\n\n\n<h4 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href=\"https:\/\/ctf-wiki.org\/pwn\/linux\/user-mode\/stackoverflow\/x86\/advanced-rop\/srop\/\">SROP &#8211; CTF Wiki<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4f55\u4e3a\u7cfb\u7edf\u8c03\u7528 \u90a3\u4e9b\u6df1\u5965\u7684\u96be\u61c2\u7684\u89e3\u91ca\u7f51\u4e0a\u6709\u4e00\u5927\u5806\uff0c\u5728\u8fd9\u91cc\u6211\u89e3\u91ca\u7684\u901a\u4fd7\u4e00\u4e9b\uff0c\u6700\u8d77\u7801\u8ba9\u4f60\u5728CTF\u4e2d\u591f\u7528\u5373\u53ef \u7b80\u5355\u6765\u8bf4 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