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DVWA-XSS-DOM-BASED.html
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DVWA XSS (DOM BASED)
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<h1 id="前言"><a href="#前言" class="headerlink" title="前言"></a>前言</h1><p>DOM型XSS其实是一种特殊类型的反射型XSS，它是基于DOM文档对象模型的一种漏洞。<span id="more"></span></p>
<p>DOM，全称Document Object Model，是一个平台和语言都中立的接口，可以使程序和脚本能够动态访问和更新文档的内容、结构以及样式。</p>
<p>在网站页面中有许多页面的元素，当页面到达浏览器时浏览器会为页面创建一个顶级的Document object文档对象，接着生成各个子文档对象，每个页面元素对应一个文档对象，每个文档对象包含属性、方法和事件。可以通过JS脚本对文档对象进行编辑从而修改页面的元素。也就是说，客户端的脚本程序可以通过DOM来动态修改页面内容，从客户端获取DOM中的数据并在本地执行。基于这个特性，就可以利用JS脚本来实现XSS漏洞的利用。</p>
<p>可能触发DOM型XSS的属性：</p>
<figure class="highlight plaintext"><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></pre></td><td class="code"><pre><span class="line">document.referer 属性</span><br><span class="line">window.name 属性</span><br><span class="line">location 属性</span><br><span class="line">innerHTML 属性</span><br><span class="line">documen.write 属性</span><br></pre></td></tr></table></figure>
<h1 id="LOW"><a href="#LOW" class="headerlink" title="LOW"></a>LOW</h1><h2 id="分析"><a href="#分析" class="headerlink" title="分析"></a>分析</h2><p>查看源码</p>
<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></pre></td><td class="code"><pre><span class="line"><span class="meta"><?php</span></span><br><span class="line"> <span class="comment"># No protections, anything goes</span></span><br><span class="line"><span class="meta">?></span> </span><br></pre></td></tr></table></figure>
<p>无任何保护措施，直接尝试输入<code>?default=<sCriPt>alert(123)</ScriPt></code>注入。</p>
<p><img src="https://raw.githubusercontent.com/Leeyuxun/pic-storage/main/img/20201119132354.png"></p>
<h1 id="MEDIUM"><a href="#MEDIUM" class="headerlink" title="MEDIUM"></a>MEDIUM</h1><h2 id="分析-1"><a href="#分析-1" class="headerlink" title="分析"></a>分析</h2><figure class="highlight plaintext"><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></pre></td><td class="code"><pre><span class="line"># 后端</span><br><span class="line"><?php</span><br><span class="line"> // Is there any input?</span><br><span class="line"> if ( array_key_exists( "default", $_GET ) && !is_null ($_GET[ 'default' ]) ) {</span><br><span class="line"> $default = $_GET['default']; </span><br><span class="line"> # Do not allow script tags</span><br><span class="line"> if (stripos ($default, "<script") !== false) {</span><br><span class="line"> header ("location: ?default=English");</span><br><span class="line"> exit;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">?> </span><br><span class="line"># 前端</span><br><span class="line"><form name="XSS" method="GET"></span><br><span class="line"> <select name="default"></span><br><span class="line"> <script></span><br><span class="line"> if (document.location.href.indexOf("default=") >= 0) {</span><br><span class="line"> var lang = document.location.href.substring(document.location.href.indexOf("default=")+8);</span><br><span class="line"> document.write("<option value='" + lang + "'>" + decodeURI(lang) + "</option>");</span><br><span class="line"> document.write("<option value='' disabled='disabled'>----</option>");</span><br><span class="line"> }</span><br><span class="line"> document.write("<option value='English'>English</option>");</span><br><span class="line"> document.write("<option value='French'>French</option>");</span><br><span class="line"> document.write("<option value='Spanish'>Spanish</option>");</span><br><span class="line"> document.write("<option value='German'>German</option>");</span><br><span class="line"> </script></span><br><span class="line"> </select></span><br><span class="line"> <input type="submit" value="Select" /></span><br><span class="line"></form></span><br></pre></td></tr></table></figure>
<p>分析：</p>
<p>过滤了<code><script></code>标签，可以使用其他标签如<code>IMG</code>过滤；</p>
<p>输入<code>?default=<img src=1 onerror='alert(123)'></code>，XSS注入成功</p>
<p><img src="https://raw.githubusercontent.com/Leeyuxun/pic-storage/main/img/20201119133653.png"></p>
<h1 id="HIGH"><a href="#HIGH" class="headerlink" title="HIGH"></a>HIGH</h1><h2 id="分析-2"><a href="#分析-2" class="headerlink" title="分析"></a>分析</h2><figure class="highlight plaintext"><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></pre></td><td class="code"><pre><span class="line"><?php</span><br><span class="line"> // Is there any input?</span><br><span class="line"> if ( array_key_exists( "default", $_GET ) && !is_null ($_GET[ 'default' ]) ) {</span><br><span class="line"> # White list the allowable languages</span><br><span class="line"> switch ($_GET['default']) {</span><br><span class="line"> case "French":</span><br><span class="line"> case "English":</span><br><span class="line"> case "German":</span><br><span class="line"> case "Spanish":</span><br><span class="line"> # ok</span><br><span class="line"> break;</span><br><span class="line"> default:</span><br><span class="line"> header ("location: ?default=English");</span><br><span class="line"> exit;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">?> </span><br></pre></td></tr></table></figure>
<p>分析：</p>
<p>白名单 只允许 传的 default值 为 French English German Spanish 其中一个</p>
<p>构造攻击语句</p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">?default=English #<span class="tag"><<span class="name">script</span>></span>alert(123)<span class="tag"></<span class="name">script</span>></span></span><br></pre></td></tr></table></figure>
<p>写入页面的效果：</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">option</span> <span class="attr">value</span>=<span class="string">''</span>></span>English #<span class="tag"><<span class="name">script</span>></span>alert(123)<span class="tag"></<span class="name">script</span>></span><span class="tag"></<span class="name">option</span>></span></span><br></pre></td></tr></table></figure>
<p>由于form表单提交的数据想经过JS过滤所以注释部分的javascript代码不会被传到服务器端(也就符合了白名单的要求)</p>
<p><img src="https://raw.githubusercontent.com/Leeyuxun/pic-storage/main/img/20201119150810.png"></p>
<h1 id="IMPOSSIBLE"><a href="#IMPOSSIBLE" class="headerlink" title="IMPOSSIBLE"></a>IMPOSSIBLE</h1><h2 id="分析-3"><a href="#分析-3" class="headerlink" title="分析"></a>分析</h2><figure class="highlight plaintext"><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></pre></td><td class="code"><pre><span class="line"># 后端</span><br><span class="line"><?php</span><br><span class="line"> # Don't need to do anything, protction handled on the client side</span><br><span class="line">?> </span><br><span class="line"># 前端</span><br><span class="line"><form name="XSS" method="GET"></span><br><span class="line"> <select name="default"></span><br><span class="line"> <script></span><br><span class="line"> if (document.location.href.indexOf("default=") >= 0) {</span><br><span class="line"> var lang = document.location.href.substring(document.location.href.indexOf("default=")+8);</span><br><span class="line"> document.write("<option value='" + lang + "'>" + (lang) + "</option>");</span><br><span class="line"> document.write("<option value='' disabled='disabled'>----</option>");</span><br><span class="line"> } </span><br><span class="line"> document.write("<option value='English'>English</option>");</span><br><span class="line"> document.write("<option value='French'>French</option>");</span><br><span class="line"> document.write("<option value='Spanish'>Spanish</option>");</span><br><span class="line"> document.write("<option value='German'>German</option>");</span><br><span class="line"> </script></span><br><span class="line"> </select></span><br><span class="line"> <input type="submit" value="Select" /></span><br><span class="line"></form></span><br></pre></td></tr></table></figure>
<p>分析：</p>
<p>输入的任何参数都是经过URL编码，然后直接赋值给option标签，不存在XSS漏洞。</p>
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