File Content: class-secupress-scan-shellshock.php <?php defined( 'ABSPATH' ) or die( 'Something went wrong.' ); /** * Shellshock scan class. * Previously was part of `SecuPress_Scan_Common_Flaws`. * * @package SecuPress * @subpackage SecuPress_Scan * @since 1.1.4 * @see http://plugins.svn.wordpress.org/shellshock-check/trunk/shellshock-check.php * @see https://www.shellshock.fr/ */ class SecuPress_Scan_Shellshock extends SecuPress_Scan implements SecuPress_Scan_Interface { /** Constants. ============================================================================== */ /** * Class version. * * @var (string) */ const VERSION = '1.2'; /** Properties. ============================================================================= */ /** * The reference to the *Singleton* instance of this class. * * @var (object) */ protected static $_instance; /** Init and messages. ====================================================================== */ /** * Init. * * @since 1.1.4 */ protected function init() { $this->title = __( 'Check if your server is vulnerable to <strong>Shellshock</strong>.', 'secupress' ); $this->more = __( '<strong>Shellshock</strong> is a critic vulnerability allowing an attacker to remotely execute malicious code on a server.', 'secupress' ); $this->more_fix = sprintf( __( 'Activate the option %1$s in the %2$s module.', 'secupress' ), '<em>' . __( 'Block Bad User-Agents', 'secupress' ) . '</em>', '<a href="' . esc_url( secupress_admin_url( 'modules', 'firewall' ) ) . '#row-bbq-headers_user-agents-header">' . __( 'Firewall', 'secupress' ) . '</a>' ); } /** * Get messages. * * @since 1.1.4 * * @param (int) $message_id A message ID. * * @return (string|array) A message if a message ID is provided. An array containing all messages otherwise. */ public static function get_messages( $message_id = null ) { /** Translators: 1 is the name of a protection, 2 is the name of a module. */ $activate_protection_message = sprintf( __( 'But you can activate the %1$s protection from the module %2$s.', 'secupress' ), '<em>' . __( 'Block Bad User-Agents', 'secupress' ) . '</em>', '<a target="_blank" href="' . esc_url( secupress_admin_url( 'modules', 'firewall' ) ) . '#row-bbq-headers_user-agents-header">' . __( 'Firewall', 'secupress' ) . '</a>' ); $messages = array( // "good" 0 => __( 'The server is not vulnerable to <strong>Shellshock</strong>.', 'secupress' ), 1 => __( 'The protection against <strong>Shellshock</strong> has been activated. It won’t fix the vulnerability (only your host can) but it will prevent an attacker to exploit it remotely.', 'secupress' ), // "warning" 100 => sprintf( __( 'Unable to determine the status of the <strong>Shellshock</strong> flaw (%s).', 'secupress' ), '<em>CVE-2014-6271</em>' ) . ' ' . $activate_protection_message, 101 => sprintf( __( 'Unable to determine the status of the <strong>Shellshock</strong> flaw (%s).', 'secupress' ), '<em>CVE-2014-7169</em>' ) . ' ' . $activate_protection_message, 102 => __( 'Unable to determine the status of the <strong>Shellshock</strong> flaw.', 'secupress' ) . ' ' . $activate_protection_message, // "bad" 200 => sprintf( __( 'The server appears to be vulnerable to <strong>Shellshock</strong> (%s).', 'secupress' ), '<em>CVE-2014-6271</em>' ), 201 => sprintf( __( 'The server appears to be vulnerable to <strong>Shellshock</strong> (%s).', 'secupress' ), '<em>CVE-2014-7169</em>' ), 202 => __( 'The server may be vulnerable to <strong>Shellshock</strong>.', 'secupress' ), ); if ( isset( $message_id ) ) { return isset( $messages[ $message_id ] ) ? $messages[ $message_id ] : __( 'Unknown message', 'secupress' ); } return $messages; } /** Getters. ================================================================================ */ /** * Get the documentation URL. * * @since 1.2.3 * * @return (string) */ public static function get_docs_url() { return __( 'https://docs.secupress.me/article/115-shellshock-scan', 'secupress' ); } /** Scan. =================================================================================== */ /** * Scan for flaw(s). * * @since 1.1.4 * * @return (array) The scan results. */ public function scan() { $activated = $this->filter_scanner( __CLASS__ ); if ( true === $activated ) { $this->add_message( 0 ); return parent::scan(); } if ( 'WIN' === strtoupper( substr( PHP_OS, 0, 3 ) ) ) { // "good" $this->add_message( 0 ); return parent::scan(); } if ( ! secupress_is_function_disabled( 'proc_open' ) ) { // Scan with `proc_open()`. $env = array( 'SHELL_SHOCK_TEST' => '() { :;}; echo VULNERABLE' ); $desc = array( 0 => array( 'pipe', 'r' ), 1 => array( 'pipe', 'w' ), 2 => array( 'pipe', 'w' ), ); // CVE-2014-6271. $p = proc_open( 'bash -c "echo Test"', $desc, $pipes, null, $env ); $output = isset( $pipes[1] ) ? stream_get_contents( $pipes[1] ) : 'error'; proc_close( $p ); if ( false !== strpos( $output, 'VULNERABLE' ) ) { // "bad" $this->add_message( 200 ); } // CVE-2014-7169. $test_date = date( 'Y' ); $p = proc_open( "rm -f echo; env 'x=() { (a)=>\' bash -c \"echo date +%Y\"; cat echo", $desc, $pipes, sys_get_temp_dir() ); $output = isset( $pipes[1] ) ? stream_get_contents( $pipes[1] ) : 'error'; proc_close( $p ); if ( trim( $output ) === $test_date ) { // "bad" $this->add_message( 201 ); } } else { // Scan by altering the User-Agent. $request_args = $this->get_default_request_args(); $request_args['user-agent'] = '() { :;}; echo VULNERABLE'; $response = wp_remote_get( add_query_arg( secupress_generate_key( 6 ), secupress_generate_key( 8 ), user_trailingslashit( home_url() ) ), $request_args ); if ( ! is_wp_error( $response ) ) { if ( 200 === wp_remote_retrieve_response_code( $response ) ) { // "bad" $this->add_message( 202 ); } else { // "good" $this->add_message( 0 ); } } } // "good" $this->maybe_set_status( 0 ); return parent::scan(); } /** Fix. ==================================================================================== */ /** * Try to fix the flaw(s). * * @since 1.4.5 * * @return (array) The fix results. */ public function need_manual_fix() { return [ 'fix' => 'fix' ]; } /** * Get an array containing ALL the forms that would fix the scan if it requires user action. * * @since 1.4.5 * * @return (array) An array of HTML templates (form contents most of the time). */ protected function get_fix_action_template_parts() { return [ 'fix' => '&nbsp;' ]; } /** * Try to fix the flaw(s) after requiring user action. * * @since 1.4.5 * * @return (array) The fix results. */ public function manual_fix() { if ( $this->has_fix_action_part( 'fix' ) ) { $this->fix(); } // "good" $this->add_fix_message( 1 ); return parent::manual_fix(); } /** * Try to fix the flaw(s). * * @since 1.1.4 * * @return (array) The fix results. */ public function fix() { // Activate. secupress_activate_submodule( 'firewall', 'user-agents-header' ); // "good" $this->add_fix_message( 1 ); return parent::fix(); } } Submit