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<?php
class wfUpdateCheck {
const VULN_SEVERITY_CRITICAL = 90;
const VULN_SEVERITY_HIGH = 70;
const VULN_SEVERITY_MEDIUM = 40;
const VULN_SEVERITY_LOW = 1;
const VULN_SEVERITY_NONE = 0;
const LAST_UPDATE_CHECK_ERROR_KEY = 'lastUpdateCheckError';
const LAST_UPDATE_CHECK_ERROR_SLUG_KEY = 'lastUpdateCheckErrorSlug';
private $needs_core_update = false;
private $core_update_version = 0;
private $plugin_updates = array();
private $all_plugins = array();
private $plugin_slugs = array();
private $theme_updates = array();
private $api = null;
/**
* This hook exists because some plugins override their own update check and can return invalid
* responses (e.g., null) due to logic errors or their update check server being unreachable. This
* can interfere with our scan running the outdated plugins check. When scanning, we adjust the
* response in those cases to be `false`, which causes WP to fall back to the plugin repo data.
*/
public static function installPluginAPIFixer() {
add_filter('plugins_api', 'wfUpdateCheck::_pluginAPIFixer', 999, 3);
}
public static function _pluginAPIFixer($result, $action, $args) {
if ($result === false || is_object($result) || is_array($result)) {
return $result;
}
if (!wfScanEngine::isScanRunning(true)) { //Skip fixing if it's not the call the scanner made
return $result;
}
$slug = null;
if (is_object($args) && isset($args->slug)) {
$slug = $args->slug;
}
else if (is_array($args) && isset($args['slug'])) {
$slug = $args['slug'];
}
wordfence::status(2, 'info', sprintf(/* translators: 1. Plugin slug. */ __('Outdated plugin scan adjusted invalid return value in plugins_api filter for %s', 'wordfence'), $slug));
return false;
}
public static function syncAllVersionInfo() {
// Load the core/plugin/theme versions into the WAF configuration.
wfConfig::set('wordpressVersion', wfUtils::getWPVersion());
wfWAFConfig::set('wordpressVersion', wfUtils::getWPVersion(), wfWAF::getInstance(), 'synced');
if (!function_exists('get_plugins')) {
require_once(ABSPATH . '/wp-admin/includes/plugin.php');
}
$pluginVersions = array();
foreach (get_plugins() as $pluginFile => $pluginData) {
$slug = plugin_basename($pluginFile);
if (preg_match('/^([^\/]+)\//', $pluginFile, $matches)) {
$slug = $matches[1];
} else if (preg_match('/^([^\/.]+)\.php$/', $pluginFile, $matches)) {
$slug = $matches[1];
}
$pluginVersions[$slug] = isset($pluginData['Version']) ? $pluginData['Version'] : null;
}
wfConfig::set_ser('wordpressPluginVersions', $pluginVersions);
wfWAFConfig::set('wordpressPluginVersions', $pluginVersions, wfWAF::getInstance(), 'synced');
if (!function_exists('wp_get_themes')) {
require_once(ABSPATH . '/wp-includes/theme.php');
}
$themeVersions = array();
foreach (wp_get_themes() as $slug => $theme) {
$themeVersions[$slug] = isset($theme['Version']) ? $theme['Version'] : null;
}
wfConfig::set_ser('wordpressThemeVersions', $themeVersions);
wfWAFConfig::set('wordpressThemeVersions', $themeVersions, wfWAF::getInstance(), 'synced');
}
public static function cvssScoreSeverity($score) {
$intScore = floor($score * 10);
if ($intScore >= self::VULN_SEVERITY_CRITICAL) {
return self::VULN_SEVERITY_CRITICAL;
}
else if ($intScore >= self::VULN_SEVERITY_HIGH) {
return self::VULN_SEVERITY_HIGH;
}
else if ($intScore >= self::VULN_SEVERITY_MEDIUM) {
return self::VULN_SEVERITY_MEDIUM;
}
else if ($intScore >= self::VULN_SEVERITY_LOW) {
return self::VULN_SEVERITY_LOW;
}
return self::VULN_SEVERITY_NONE;
}
public static function cvssScoreSeverityLabel($score) {
$severity = self::cvssScoreSeverity($score);
switch ($severity) {
case self::VULN_SEVERITY_CRITICAL:
return __('Critical', 'wordfence');
case self::VULN_SEVERITY_HIGH:
return __('High', 'wordfence');
case self::VULN_SEVERITY_MEDIUM:
return __('Medium', 'wordfence');
case self::VULN_SEVERITY_LOW:
return __('Low', 'wordfence');
}
return __('None', 'wordfence');
}
public static function cvssScoreSeverityHexColor($score) {
$severity = self::cvssScoreSeverity($score);
switch ($severity) {
case self::VULN_SEVERITY_CRITICAL:
return '#cc0500';
case self::VULN_SEVERITY_HIGH:
return '#df3d03';
case self::VULN_SEVERITY_MEDIUM:
return '#f9a009';
case self::VULN_SEVERITY_LOW:
return '#ffcb0d';
}
return '#000000';
}
public static function cvssScoreSeverityClass($score) {
$severity = self::cvssScoreSeverity($score);
switch ($severity) {
case self::VULN_SEVERITY_CRITICAL:
return 'wf-vulnerability-severity-critical';
case self::VULN_SEVERITY_HIGH:
return 'wf-vulnerability-severity-high';
case self::VULN_SEVERITY_MEDIUM:
return 'wf-vulnerability-severity-medium';
case self::VULN_SEVERITY_LOW:
return 'wf-vulnerability-severity-low';
}
return 'wf-vulnerability-severity-none';
}
public function __construct() {
$this->api = new wfAPI(wfConfig::get('apiKey'), wfUtils::getWPVersion());
}
public function __sleep() {
return array('needs_core_update', 'core_update_version', 'plugin_updates', 'all_plugins', 'plugin_slugs', 'theme_updates');
}
public function __wakeup() {
$this->api = new wfAPI(wfConfig::get('apiKey'), wfUtils::getWPVersion());
}
/**
* @return bool
*/
public function needsAnyUpdates() {
return $this->needsCoreUpdate() || count($this->getPluginUpdates()) > 0 || count($this->getThemeUpdates()) > 0;
}
/**
* Check for any core, plugin or theme updates.
*
* @return $this
*/
public function checkAllUpdates($useCachedValued = true) {
if (!$useCachedValued) {
wfConfig::remove(self::LAST_UPDATE_CHECK_ERROR_KEY);
wfConfig::remove(self::LAST_UPDATE_CHECK_ERROR_SLUG_KEY);
}
return $this->checkCoreUpdates($useCachedValued)
->checkPluginUpdates($useCachedValued)
->checkThemeUpdates($useCachedValued);
}
/**
* Check if there is an update to the WordPress core.
*
* @return $this
*/
public function checkCoreUpdates($useCachedValued = true) {
$this->needs_core_update = false;
if (!function_exists('wp_version_check')) {
require_once(ABSPATH . WPINC . '/update.php');
}
if (!function_exists('get_preferred_from_update_core')) {
require_once(ABSPATH . 'wp-admin/includes/update.php');
}
include(ABSPATH . WPINC . '/version.php'); /** @var $wp_version */
$update_core = get_preferred_from_update_core();
if ($useCachedValued && isset($update_core->last_checked) && isset($update_core->version_checked) && 12 * HOUR_IN_SECONDS > (time() - $update_core->last_checked) && $update_core->version_checked == $wp_version) { //Duplicate of _maybe_update_core, which is a private call
//Do nothing, use cached value
}
else {
wp_version_check();
$update_core = get_preferred_from_update_core();
}
if (isset($update_core->response) && $update_core->response == 'upgrade') {
$this->needs_core_update = true;
$this->core_update_version = $update_core->current;
}
return $this;
}
private function checkPluginFile($plugin, &$installedPlugins) {
if (!array_key_exists($plugin, $installedPlugins))
return null;
$file = wfUtils::getPluginBaseDir() . $plugin;
if (!file_exists($file)) {
unset($installedPlugins[$plugin]);
return null;
}
return $file;
}
private function initializePluginUpdateData($plugin, &$installedPlugins, $checkVulnerabilities, $populator = null) {
$file = $this->checkPluginFile($plugin, $installedPlugins);
if ($file === null)
return null;
$data = $installedPlugins[$plugin];
$data['pluginFile'] = $file;
if ($populator !== null)
$populator($data, $file);
if (!array_key_exists('slug', $data) || empty($data['slug']))
$data['slug'] = $this->extractSlug($plugin);
$slug = $data['slug'];
if ($slug !== null) {
$vulnerable = $checkVulnerabilities ? $this->isPluginVulnerable($slug, $data['Version']) : null;
$data['vulnerable'] = !empty($vulnerable);
if ($data['vulnerable']) {
if (isset($vulnerable['link']) && is_string($vulnerable['link'])) { $data['vulnerabilityLink'] = $vulnerable['link']; }
if (isset($vulnerable['score'])) {
$data['cvssScore'] = number_format(floatval($vulnerable['score']), 1);
$data['severityColor'] = self::cvssScoreSeverityHexColor($data['cvssScore']);
$data['severityLabel'] = self::cvssScoreSeverityLabel($data['cvssScore']);
$data['severityClass'] = self::cvssScoreSeverityClass($data['cvssScore']);
}
if (isset($vulnerable['vector']) && is_string($vulnerable['vector'])) { $data['cvssVector'] = $vulnerable['vector']; }
}
$this->plugin_slugs[] = $slug;
$this->all_plugins[$slug] = $data;
}
unset($installedPlugins[$plugin]);
return $data;
}
public function extractSlug($plugin, $data = null) {
$slug = null;
if (is_array($data) && array_key_exists('slug', $data))
$slug = $data['slug'];
if (!is_string($slug) || empty($slug)) {
if (preg_match('/^([^\/]+)\//', $plugin, $matches)) {
$slug = $matches[1];
}
else if (preg_match('/^([^\/.]+)\.php$/', $plugin, $matches)) {
$slug = $matches[1];
}
}
return $slug;
}
private static function requirePluginsApi() {
if (!function_exists('plugins_api'))
require_once(ABSPATH . '/wp-admin/includes/plugin-install.php');
}
private function fetchPluginUpdates($useCache = true) {
$update_plugins = get_site_transient('update_plugins');
if ($useCache && isset($update_plugins->last_checked) && 12 * HOUR_IN_SECONDS > (time() - $update_plugins->last_checked)) //Duplicate of _maybe_update_plugins, which is a private call
return $update_plugins;
if (!function_exists('wp_update_plugins'))
require_once(ABSPATH . WPINC . '/update.php');
try {
wp_update_plugins();
}
catch (Exception $e) {
wfConfig::set(self::LAST_UPDATE_CHECK_ERROR_KEY, $e->getMessage(), false);
wfConfig::remove(self::LAST_UPDATE_CHECK_ERROR_SLUG_KEY);
error_log('Caught exception while attempting to refresh plugin update status: ' . $e->getMessage());
}
catch (Throwable $t) {
wfConfig::set(self::LAST_UPDATE_CHECK_ERROR_KEY, $t->getMessage(), false);
wfConfig::remove(self::LAST_UPDATE_CHECK_ERROR_SLUG_KEY);
error_log('Caught error while attempting to refresh plugin update status: ' . $t->getMessage());
}
return get_site_transient('update_plugins');
}
/**
* Check if any plugins need an update.
*
* @param bool $checkVulnerabilities whether or not to check for vulnerabilities while checking updates
*
* @return $this
*/
public function checkPluginUpdates($useCachedValued = true, $checkVulnerabilities = true) {
if($checkVulnerabilities)
$this->plugin_updates = array();
self::requirePluginsApi();
$update_plugins = $this->fetchPluginUpdates($useCachedValued);
//Get the full plugin list
if (!function_exists('get_plugins')) {
require_once(ABSPATH . '/wp-admin/includes/plugin.php');
}
$installedPlugins = get_plugins();
$context = $this;
if ($update_plugins && !empty($update_plugins->response)) {
foreach ($update_plugins->response as $plugin => $vals) {
$data = $this->initializePluginUpdateData($plugin, $installedPlugins, $checkVulnerabilities, function (&$data, $file) use ($context, $plugin, $vals) {
$vals = (array) $vals;
$data['slug'] = $context->extractSlug($plugin, $vals);
$data['newVersion'] = (isset($vals['new_version']) ? $vals['new_version'] : 'Unknown');
$data['wpURL'] = (isset($vals['url']) ? rtrim($vals['url'], '/') : null);
$data['updateAvailable'] = true;
});
if($checkVulnerabilities && $data !== null)
$this->plugin_updates[] = $data;
}
}
//We have to grab the slugs from the update response because no built-in function exists to return the true slug from the local files
if ($update_plugins && !empty($update_plugins->no_update)) {
foreach ($update_plugins->no_update as $plugin => $vals) {
$this->initializePluginUpdateData($plugin, $installedPlugins, $checkVulnerabilities, function (&$data, $file) use ($context, $plugin, $vals) {
$vals = (array) $vals;
$data['slug'] = $context->extractSlug($plugin, $vals);
$data['wpURL'] = (isset($vals['url']) ? rtrim($vals['url'], '/') : null);
});
}
}
//Get the remaining plugins (not in the wordpress.org repo for whatever reason)
foreach ($installedPlugins as $plugin => $data) {
$data = $this->initializePluginUpdateData($plugin, $installedPlugins, $checkVulnerabilities);
}
return $this;
}
/**
* Check if any themes need an update.
*
* @param bool $checkVulnerabilities whether or not to check for vulnerabilities while checking for updates
*
* @return $this
*/
public function checkThemeUpdates($useCachedValued = true, $checkVulnerabilities = true) {
if($checkVulnerabilities)
$this->theme_updates = array();
if (!function_exists('wp_update_themes')) {
require_once(ABSPATH . WPINC . '/update.php');
}
$update_themes = get_site_transient('update_themes');
if ($useCachedValued && isset($update_themes->last_checked) && 12 * HOUR_IN_SECONDS > (time() - $update_themes->last_checked)) { //Duplicate of _maybe_update_themes, which is a private call
//Do nothing, use cached value
}
else {
try {
wp_update_themes();
}
catch (Exception $e) {
wfConfig::set(self::LAST_UPDATE_CHECK_ERROR_KEY, $e->getMessage(), false);
error_log('Caught exception while attempting to refresh theme update status: ' . $e->getMessage());
}
catch (Throwable $t) {
wfConfig::set(self::LAST_UPDATE_CHECK_ERROR_KEY, $t->getMessage(), false);
error_log('Caught error while attempting to refresh theme update status: ' . $t->getMessage());
}
$update_themes = get_site_transient('update_themes');
}
if ($update_themes && (!empty($update_themes->response)) && $checkVulnerabilities) {
if (!function_exists('wp_get_themes')) {
require_once(ABSPATH . '/wp-includes/theme.php');
}
$themes = wp_get_themes();
foreach ($update_themes->response as $theme => $vals) {
foreach ($themes as $name => $themeData) {
if (strtolower($name) == $theme) {
$vulnerable = false;
if (isset($themeData['Version'])) {
$vulnerable = $this->isThemeVulnerable($theme, $themeData['Version']);
}
$data = array(
'newVersion' => (isset($vals['new_version']) ? $vals['new_version'] : 'Unknown'),
'package' => (isset($vals['package']) ? $vals['package'] : null),
'URL' => (isset($vals['url']) ? $vals['url'] : null),
'Name' => $themeData['Name'],
'name' => $themeData['Name'],
'version' => $themeData['Version'],
'vulnerable' => $vulnerable
);
$data['vulnerable'] = !empty($vulnerable);
if ($data['vulnerable']) {
if (isset($vulnerable['link']) && is_string($vulnerable['link'])) { $data['vulnerabilityLink'] = $vulnerable['link']; }
if (isset($vulnerable['score'])) {
$data['cvssScore'] = number_format(floatval($vulnerable['score']), 1);
$data['severityColor'] = self::cvssScoreSeverityHexColor($data['cvssScore']);
$data['severityLabel'] = self::cvssScoreSeverityLabel($data['cvssScore']);
$data['severityClass'] = self::cvssScoreSeverityClass($data['cvssScore']);
}
if (isset($vulnerable['vector']) && is_string($vulnerable['vector'])) { $data['cvssVector'] = $vulnerable['vector']; }
}
$this->theme_updates[] = $data;
}
}
}
}
return $this;
}
public function checkAllVulnerabilities() {
$this->checkPluginVulnerabilities();
$this->checkThemeVulnerabilities();
}
private function initializePluginVulnerabilityData($plugin, &$installedPlugins, &$records, $values = null, $update = false) {
$file = $this->checkPluginFile($plugin, $installedPlugins);
if ($file === null)
return null;
$data = $installedPlugins[$plugin];
$record = array(
'slug' => $this->extractSlug($plugin, $values),
'fromVersion' => isset($data['Version']) ? $data['Version'] : 'Unknown',
'vulnerable' => false
);
if ($update && is_array($values))
$record['toVersion'] = isset($values['new_version']) ? $values['new_version'] : 'Unknown';
$records[] = $record;
unset($installedPlugins[$plugin]);
}
/**
* @param bool $initial if true, treat as the initial scan run
*/
public function checkPluginVulnerabilities($initial=false) {
self::requirePluginsApi();
$vulnerabilities = array();
//Get the full plugin list
if (!function_exists('get_plugins')) {
require_once(ABSPATH . '/wp-admin/includes/plugin.php');
}
$installedPlugins = get_plugins();
//Get the info for plugins on wordpress.org
$update_plugins = $this->fetchPluginUpdates();
if ($update_plugins) {
if (!empty($update_plugins->response)) {
foreach ($update_plugins->response as $plugin => $vals) {
$this->initializePluginVulnerabilityData($plugin, $installedPlugins, $vulnerabilities, (array) $vals, true);
}
}
if (!empty($update_plugins->no_update)) {
foreach ($update_plugins->no_update as $plugin => $vals) {
$this->initializePluginVulnerabilityData($plugin, $installedPlugins, $vulnerabilities, (array) $vals);
}
}
}
//Get the remaining plugins (not in the wordpress.org repo for whatever reason)
foreach ($installedPlugins as $plugin => $data) {
$this->initializePluginVulnerabilityData($plugin, $installedPlugins, $vulnerabilities, $data);
}
if (count($vulnerabilities) > 0) {
try {
$result = $this->api->call('plugin_vulnerability_check', array(), array(
'plugins' => json_encode($vulnerabilities),
));
foreach ($vulnerabilities as &$v) {
$vulnerableList = $result['vulnerable'];
foreach ($vulnerableList as $r) {
if ($r['slug'] == $v['slug']) {
$v['vulnerable'] = !!$r['vulnerable'];
if (isset($r['link'])) {
$v['link'] = $r['link'];
}
if (isset($r['score'])) {
$v['score'] = $r['score'];
}
if (isset($r['vector'])) {
$v['vector'] = $r['vector'];
}
break;
}
}
}
}
catch (Exception $e) {
//Do nothing
}
wfConfig::set_ser('vulnerabilities_plugin', $vulnerabilities);
}
}
/**
* @param bool $initial whether or not this is the initial run
*/
public function checkThemeVulnerabilities($initial = false) {
if (!function_exists('wp_update_themes')) {
require_once(ABSPATH . WPINC . '/update.php');
}
self::requirePluginsApi();
$this->checkThemeUpdates(!$initial, false);
$update_themes = get_site_transient('update_themes');
$vulnerabilities = array();
if ($update_themes && !empty($update_themes->response)) {
if (!function_exists('get_plugin_data'))
{
require_once(ABSPATH . '/wp-admin/includes/plugin.php');
}
foreach ($update_themes->response as $themeSlug => $vals) {
$valsArray = (array) $vals;
$theme = wp_get_theme($themeSlug);
$record = array();
$record['slug'] = $themeSlug;
$record['toVersion'] = (isset($valsArray['new_version']) ? $valsArray['new_version'] : 'Unknown');
$record['fromVersion'] = $theme->version;
$record['vulnerable'] = false;
$vulnerabilities[] = $record;
}
try {
$result = $this->api->call('theme_vulnerability_check', array(), array(
'themes' => json_encode($vulnerabilities),
));
foreach ($vulnerabilities as &$v) {
$vulnerableList = $result['vulnerable'];
foreach ($vulnerableList as $r) {
if ($r['slug'] == $v['slug']) {
$v['vulnerable'] = !!$r['vulnerable'];
if (isset($r['link'])) {
$v['link'] = $r['link'];
}
if (isset($r['score'])) {
$v['score'] = $r['score'];
}
if (isset($r['vector'])) {
$v['vector'] = $r['vector'];
}
break;
}
}
}
}
catch (Exception $e) {
//Do nothing
}
wfConfig::set_ser('vulnerabilities_theme', $vulnerabilities);
}
}
public function isPluginVulnerable($slug, $version) {
return $this->_isSlugVulnerable('vulnerabilities_plugin', $slug, $version, function(){ $this->checkPluginVulnerabilities(true); });
}
public function isThemeVulnerable($slug, $version) {
return $this->_isSlugVulnerable('vulnerabilities_theme', $slug, $version, function(){ $this->checkThemeVulnerabilities(true); });
}
private function _isSlugVulnerable($vulnerabilitiesKey, $slug, $version, $populateVulnerabilities=null) {
$vulnerabilities = wfConfig::get_ser($vulnerabilitiesKey, null);
if($vulnerabilities===null){
if(is_callable($populateVulnerabilities)){
$populateVulnerabilities();
return $this->_isSlugVulnerable($vulnerabilitiesKey, $slug, $version);
}
return false;
}
foreach ($vulnerabilities as $v) {
if ($v['slug'] == $slug) {
if (
($v['fromVersion'] == 'Unknown' && $v['toVersion'] == 'Unknown') ||
((!isset($v['toVersion']) || $v['toVersion'] == 'Unknown') && version_compare($version, $v['fromVersion']) >= 0) ||
($v['fromVersion'] == 'Unknown' && isset($v['toVersion']) && version_compare($version, $v['toVersion']) < 0) ||
(version_compare($version, $v['fromVersion']) >= 0 && isset($v['toVersion']) && version_compare($version, $v['toVersion']) < 0)
) {
if ($v['vulnerable']) { return $v; }
return false;
}
}
}
return false;
}
/**
* @return boolean
*/
public function needsCoreUpdate() {
return $this->needs_core_update;
}
/**
* @return int
*/
public function getCoreUpdateVersion() {
return $this->core_update_version;
}
/**
* @return array
*/
public function getPluginUpdates() {
return $this->plugin_updates;
}
/**
* @return array
*/
public function getAllPlugins() {
return $this->all_plugins;
}
/**
* @return array
*/
public function getPluginSlugs() {
return $this->plugin_slugs;
}
/**
* @return array
*/
public function getThemeUpdates() {
return $this->theme_updates;
}
}