{"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\/sv\/blog\/news\/uyazvimost-v-biblioteke-pharstreamwrapper-zatragivayushhaya-drupal-joomla-i-typo3","title":{"rendered":"S\u00e5rbarhet i biblioteket PharStreamWrapper som p\u00e5verkar Drupal, Joomla och Typo3","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>I biblioteket <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/TYPO3\/phar-stream-wrapper\">PharStreamWrapper<\/a><\/noindex>, som tillhandah\u00e5ller hanterare f\u00f6r skydd mot <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=49746\">genom att anv\u00e4nda<\/a><\/noindex> <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=49641\">attacker<\/a><\/noindex> genom att anv\u00e4nda filinneh\u00e5ll i formatet &#171;Phar&#187;. <noindex><a rel=\"nofollow\" href=\"https:\/\/typo3.org\/security\/advisory\/typo3-psa-2019-007\/\">uppt\u00e4cktes<\/a><\/noindex> <noindex><a rel=\"nofollow\" href=\"https:\/\/www.drupal.org\/sa-core-2019-007\">s\u00e5rbarhet<\/a><\/noindex> (<noindex><a rel=\"nofollow\" href=\"https:\/\/security-tracker.debian.org\/tracker\/CVE-2019-11831\">CVE-2019-11831<\/a><\/noindex>), vilket g\u00f6r det m\u00f6jligt att kringg\u00e5 skyddet mot avdeserialisering av kod genom att infoga tecken &#171;..&#187; i s\u00f6kv\u00e4gen. Till exempel kan en angripare anv\u00e4nda en URL som &#171;phar:\/\/\/path\/bad.phar\/..\/good.phar&#187; f\u00f6r att biblioteket ska extrahera det grundl\u00e4ggande namnet &#171;\/path\/good.phar&#187;, \u00e4ven om filen &#171;\/path\/bad.phar&#187; anv\u00e4nds vid vidare behandling av en s\u00e5dan s\u00f6kv\u00e4g.<\/p>\n<p>Biblioteket har utvecklats av skaparna av CMS TYPO3, men anv\u00e4nds ocks\u00e5 i projekt som Drupal och Joomla, vilket g\u00f6r dem utsatta f\u00f6r samma s\u00e5rbarhet. Problemet \u00e5tg\u00e4rdades i versionerna <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/TYPO3\/phar-stream-wrapper\/releases\">PharStreamWrapper 2.1.1 och 3.1.1<\/a><\/noindex>. Drupal-projektet \u00e5tg\u00e4rdade problemet i uppdateringarna 7.67, 8.6.16 och 8.7.1. I Joomla framtr\u00e4dde problemet fr\u00e5n version 3.9.3 och r\u00e4ttades i version 3.9.6. F\u00f6r att \u00e5tg\u00e4rda problemet i TYPO3 kr\u00e4vs en uppdatering av PharStreamWrapper-biblioteket.<\/p>\n<p>Ur ett praktiskt perspektiv g\u00f6r s\u00e5rbarheten i PharStreamWrapper att en anv\u00e4ndare av Drupal Core med administrat\u00f6rsr\u00e4ttigheter f\u00f6r temat (&#8216;Administrera tema&#8217;) kan ladda upp en skadlig phar-fil och f\u00e5 PHP-koden som finns i den att k\u00f6ras som en legitim phar-arkiv. Vi p\u00e5minner om att syftet med &#171;Phar deserialization&#187;-attacken \u00e4r att n\u00e4r uppladdade filer kontrolleras genom PHP-funktionen file_exists(), utf\u00f6rs automatiskt en avdeserialisering av metadata fr\u00e5n Phar-filer (PHP-arkiv) n\u00e4r s\u00f6kv\u00e4gar som b\u00f6rjar med &#171;phar:\/\/&#187; behandlas. \u00d6verf\u00f6ringen av phar-filen kan g\u00f6ras i skepnaden av en bild, eftersom funktionen file_exists() identifierar MIME-typ utifr\u00e5n inneh\u00e5llet, inte baserat p\u00e5 fil\u00e4ndelsen.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>K\u00e4lla: <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 5.0.4 - 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 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