梦想v1.4 CMS平台XSS漏洞分析

2015 年 2 月 8 日

一、背景介绍

梦想cms以下简称“lmxcms”，是由“10年”（网名）开发的一套简单实用的网站管理系统（cms）。它是完全免费和开源的。

漏洞类型：

存储型xss注入

漏洞描述：

在Lmxcms 1.4版本（目前最新版本）中，存在一处后台xss漏洞。Lmxcms未对编辑的产品内容进行过滤处理，从而导致漏洞发生。

受影响的系统版本：

LMXCMS <=V1.4

二、漏洞分析

通过黑盒测试，我们在后台管理员页面发现了一个存储型xss漏洞。该漏洞存在于admin.php页面的内容管理中的产品信息修改页面中

查看该点

尝试在该点进行xss注入

alert(‘xss’)</p> <p> <img src="https://img1.tuicool.com/rqMFJr3.jpg!web"></p> <p>注入结果失败，没有弹窗，接着打开burpsuite截包分析</p> <p>发现注入内容被转码，尝试在burpsuite进行改造</p> <p> <img src="https://img0.tuicool.com/FRfMbaQ.jpg!web"></p> <p>发包，接着打开页面发现弹窗，说明xss注入成功</p> <p> <img src="https://img1.tuicool.com/Q3ErIze.jpg!web"></p> <h2>三、代码审计</h2> <h3>3.1.先定位到漏洞存在点的提交页面</h3> <p> <img src="https://img1.tuicool.com/m6RJZry.jpg!web"></p> <p>在这里我们发现了提交页面是当前admin.php页面后接参数&m和&a来提交到相应页面</p> <h3>3.2.通过代码审计，定位该页面</h3> <p>1-先到主页面admin.php页面，发现这里存在两个文件包含</p> <p> <img src="https://img0.tuicool.com/22A3Ajq.jpg!web"></p> <p>2-进入到/inc/run.inc.php继续查找参数&m和&a</p> <p>在这里我们找到了参数&m和&a</p> <p>通过代码审计，发现如果在html上提交了&m的值，就会创建一个action对象，执行run()函数</p> <p> <img src="https://img1.tuicool.com/RRzYB3V.jpg!web"></p> <p>3-追踪run()函数</p> <p>该函数作用是执行当前对象的&a方法，&a为在html上提交的参数&a的值update</p> <p>也就是执行当前对象的update()方法</p> <p> <img src="https://img0.tuicool.com/UFjUJfi.jpg!web"></p> <p>4-追踪update()方法</p> <p>通过函数定位，找到多个update()方法</p> <p>观察发现有个路径是/c/admin/ContentAction.class.php</p> <p>符合要寻找参数&m的值Content</p> <p> <img src="https://img2.tuicool.com/qMZFbev.jpg!web"></p> <p>进入该页面发现update()函数是更新数据的，当漏洞页面提交了数据之后会把数据提交到该页面，并且更新信息，在这可以发现更新数据会调用一个check()函数，接着定位并查看该函数</p> <p> <img src="https://img0.tuicool.com/77zENvm.jpg!web"></p> <p>定位到我们需要查看的ContentAction.class.php页面</p> <p> <img src="https://img2.tuicool.com/73QFVvb.jpg!web"></p> <p>5-check()函数</p> <p>在该函数下可以发现数据并没有进行过滤，漏洞页面上提交的数据原样提交上来，这就是xss注入的漏洞点</p> <p> <img src="https://img0.tuicool.com/mqMZjqR.jpg!web"></p> <p>通过定位updateInfo，可以找到漏洞页面html代码</p> <p> <img src="https://img1.tuicool.com/eaaERrR.jpg!web"></p> <p>在该页面可以发现漏洞点提交的数据’description’</p> <p> <img src="https://img0.tuicool.com/ABjEBve.jpg!web"></p> </div>  <div class="tags"></div>  </div>  <div class="related-posts"><div class="postauthor-top"><h3>Related Posts</h3></div> <article class="post excerpt "> <a href="https://www.go2live.cn/nocate/javascript-date-%e7%9a%84%e6%97%b6%e5%8c%ba.html" title="JavaScript Date 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