{"id":33388,"date":"2019-10-31T21:52:18","date_gmt":"2019-10-31T18:52:18","guid":{"rendered":"https:\/\/prohoster.info\/blog\/uyazvimost-v-biblioteke-pharstreamwrapper-zatragivayushhaya-drupal-joomla-i-typo3\/"},"modified":"2019-10-31T21:52:18","modified_gmt":"2019-10-31T18:52:18","slug":"uyazvimost-v-biblioteke-pharstreamwrapper-zatragivayushhaya-drupal-joomla-i-typo3","status":"publish","type":"post","link":"https:\/\/prohoster.info\/es\/blog\/news\/uyazvimost-v-biblioteke-pharstreamwrapper-zatragivayushhaya-drupal-joomla-i-typo3","title":{"rendered":"Vulnerabilidad en la biblioteca PharStreamWrapper que afecta a Drupal, Joomla y Typo3.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>En la biblioteca <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/TYPO3\/phar-stream-wrapper\">PharStreamWrapper<\/a><\/noindex>, que proporciona controladores para la protecci\u00f3n contra <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=49746\">la realizaci\u00f3n<\/a><\/noindex> <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=49641\">ataques?<\/a><\/noindex> a trav\u00e9s de la sustituci\u00f3n de archivos en formato &#171;Phar&#187;, <noindex><a rel=\"nofollow\" href=\"https:\/\/typo3.org\/security\/advisory\/typo3-psa-2019-007\/\">se ha detectado<\/a><\/noindex> <noindex><a rel=\"nofollow\" href=\"https:\/\/www.drupal.org\/sa-core-2019-007\">vulnerabilidad<\/a><\/noindex> (<noindex><a rel=\"nofollow\" href=\"https:\/\/security-tracker.debian.org\/tracker\/CVE-2019-11831\">CVE-2019-11831<\/a><\/noindex>), que permite eludir la protecci\u00f3n contra la deserializaci\u00f3n de c\u00f3digo mediante la sustituci\u00f3n de caracteres &#171;..&#187; en la ruta. Por ejemplo, un atacante puede utilizar para el ataque una URL del tipo &#171;phar:\/\/path\/bad.phar\/..\/good.phar&#187; y la biblioteca extraer\u00e1 al verificar el nombre base &#171;\/path\/good.phar&#187;, aunque al procesar dicha ruta se usar\u00e1 el archivo &#171;\/path\/bad.phar&#187;.<\/p>\n<p>La biblioteca fue desarrollada por los creadores de CMS TYPO3, pero tambi\u00e9n se utiliza en proyectos de Drupal y Joomla, lo que los hace vulnerables. El problema se ha solucionado en las versiones <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/TYPO3\/phar-stream-wrapper\/releases\">PharStreamWrapper 2.1.1 y 3.1.1<\/a><\/noindex>. El proyecto Drupal resolvi\u00f3 el problema en las actualizaciones 7.67, 8.6.16 y 8.7.1. En Joomla, el problema se presenta a partir de la versi\u00f3n 3.9.3 y se solucion\u00f3 en la versi\u00f3n 3.9.6. Para solucionar el problema en TYPO3, es necesario actualizar la biblioteca PharStreamWapper.<\/p>\n<p>Desde un punto de vista pr\u00e1ctico, la vulnerabilidad en PharStreamWapper permite a un usuario de Drupal Core con privilegios de administrador de temas (&#8216;Administer theme&#8217;) cargar un archivo phar malicioso y lograr la ejecuci\u00f3n del c\u00f3digo PHP alojado en \u00e9l bajo la apariencia de un archivo phar leg\u00edtimo. Recordemos que el objetivo del ataque de &#171;deserializaci\u00f3n Phar&#187; radica en que al verificar los archivos cargados a trav\u00e9s de la funci\u00f3n PHP file_exists(), esta funci\u00f3n realiza autom\u00e1ticamente la deserializaci\u00f3n de los metadatos de los archivos Phar (PHP Archive) al procesar rutas que comienzan con &#171;phar:\/\/&#187;. La transmisi\u00f3n del archivo phar es posible bajo la apariencia de una imagen, ya que la funci\u00f3n file_exists() determina el tipo MIME por el contenido y no por la extensi\u00f3n.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Fuente: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=50665\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0435 PharStreamWrapper, \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0435\u0439 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 \u0434\u043b\u044f \u0437\u0430\u0449\u0438\u0442\u044b \u043e\u0442 \u043f\u0440\u043e\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u0430\u0442\u0430\u043a \u0447\u0435\u0440\u0435\u0437 \u043f\u043e\u0434\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0443 \u0444\u0430\u0439\u043b\u043e\u0432 \u0432 \u0444\u043e\u0440\u043c\u0430\u0442\u0435 &#171;Phar&#187;, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2019-11831), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043e\u0431\u043e\u0439\u0442\u0438 \u0437\u0430\u0449\u0438\u0442\u0443 \u043e\u0442 \u0434\u0435\u0441\u0435\u0440\u0438\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043a\u043e\u0434\u0430 \u0447\u0435\u0440\u0435\u0437 \u043f\u043e\u0434\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0443 \u0441\u0438\u043c\u0432\u043e\u043b\u043e\u0432 &#171;..&#187; \u0432 \u043f\u0443\u0442\u0438. \u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0438\u0439 \u043c\u043e\u0436\u0435\u0442 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0434\u043b\u044f \u0430\u0442\u0430\u043a\u0438 URL \u0432\u0438\u0434\u0430 &#171;phar:\/\/\/path\/bad.phar\/..\/good.phar&#187; \u0438 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430 \u0432\u044b\u0434\u0435\u043b\u0438\u0442 \u043f\u0440\u0438 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0435 \u0431\u0430\u0437\u043e\u0432\u043e\u0435 \u0438\u043c\u044f &#171;\/path\/good.phar&#187;, \u0445\u043e\u0442\u044f \u043f\u0440\u0438 \u0434\u0430\u043b\u044c\u043d\u0435\u0439\u0448\u0435\u0439 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0435 \u043f\u043e\u0434\u043e\u0431\u043d\u043e\u0433\u043e \u043f\u0443\u0442\u0438 \u0431\u0443\u0434\u0435\u0442 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-33388","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.2 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0435 PharStreamWrapper, \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0435\u0439 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 \u0434\u043b\u044f \u0437\u0430\u0449\u0438\u0442\u044b \u043e\u0442\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" 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