{"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\/cs\/blog\/news\/uyazvimost-v-biblioteke-pharstreamwrapper-zatragivayushhaya-drupal-joomla-i-typo3","title":{"rendered":"Zranitelnost v knihovn\u011b PharStreamWrapper, kter\u00e1 se dot\u00fdk\u00e1 Drupal, Joomla a Typo3","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V knihovn\u011b PharStreamWrapper<\/a><\/noindex>, poskytuj\u00edc\u00ed zpracovatele pro ochranu p\u0159ed prov\u00e1d\u011bn\u00edm<\/a><\/noindex> \u00fatok\u016f<\/a><\/noindex> p\u0159es substituci soubor\u016f ve form\u00e1tu «Phar», byla odhalena<\/a><\/noindex> zranitelnost<\/a><\/noindex> (CVE-2019-11831<\/a><\/noindex>), co\u017e umo\u017e\u0148uje obej\u00edt ochranu proti deserializaci k\u00f3du prost\u0159ednictv\u00edm substituce znak\u016f «..» v cest\u011b. Nap\u0159\u00edklad \u00fato\u010dn\u00edk m\u016f\u017ee pou\u017e\u00edt pro \u00fatok URL ve tvaru «phar:\/\/\/path\/bad.phar\/....\/good.phar» a knihovna p\u0159i kontrole vy\u010dlen\u00ed z\u00e1kladn\u00ed n\u00e1zev «\/path\/good.phar», p\u0159i\u010dem\u017e p\u0159i dal\u0161\u00edm zpracov\u00e1n\u00ed podobn\u00e9 cesty bude pou\u017eit soubor «\/path\/bad.phar».<\/p>\n

Knihovna byla vyvinuta tv\u016frci CMS TYPO3, ale tak\u00e9 se pou\u017e\u00edv\u00e1 v projektech Drupal a Joomla, co\u017e je d\u011bl\u00e1 tak\u00e9 zraniteln\u00fdmi. Probl\u00e9m byl vy\u0159e\u0161en v verz\u00edch PharStreamWrapper 2.1.1 a 3.1.1<\/a><\/noindex>. Projekt Drupal vy\u0159e\u0161il probl\u00e9m v aktualizac\u00edch 7.67, 8.6.16 a 8.7.1. V Joomla se probl\u00e9m projevuje od verze 3.9.3 a byl vy\u0159e\u0161en ve verzi 3.9.6. Pro vy\u0159e\u0161en\u00ed probl\u00e9mu v TYPO3 je nutn\u00e9 aktualizovat knihovnu PharStreamWapper.<\/p>\n

Z praktick\u00e9ho hlediska zranitelnost v PharStreamWapper umo\u017e\u0148uje u\u017eivateli syst\u00e9mu Drupal Core, kter\u00fd m\u00e1 opr\u00e1vn\u011bn\u00ed administr\u00e1tora vzhled\u016f (‘Administer theme’), nahr\u00e1t \u0161kodliv\u00fd phar-soubor a doc\u00edlit vykon\u00e1n\u00ed v n\u011bm um\u00edst\u011bn\u00e9ho PHP k\u00f3du pod z\u00e1minkou legitimn\u00edho phar-archivu. P\u0159ipome\u0148me, \u017ee podstata \u00fatoku «Phar deserialization» spo\u010d\u00edv\u00e1 v tom, \u017ee p\u0159i kontrole nahran\u00fdch soubor\u016f pomoc\u00ed PHP funkce file_exists() tato funkce automaticky prov\u00e1d\u00ed deserializaci metadat ze soubor\u016f Phar (PHP Archive) p\u0159i zpracov\u00e1n\u00ed cest, kter\u00e9 za\u010d\u00ednaj\u00ed «phar:\/\/». P\u0159ed\u00e1n\u00ed phar-souboru je mo\u017en\u00e9 pod z\u00e1minkou obr\u00e1zku, proto\u017ee funkce file_exists() ur\u010duje MIME typ podle obsahu, nikoliv podle p\u0159\u00edpony.<\/p>\n

<\/a><\/noindex><\/p>\n

Zdroj: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\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 «Phar», \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 «..» \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 «phar:\/\/\/path\/bad.phar\/..\/good.phar» \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 «\/path\/good.phar», \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 […]<\/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\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Zranitelnost v knihovn\u011b PharStreamWrapper, kter\u00e1 se dot\u00fdk\u00e1 Drupal, Joomla a Typo3 | ProHoster","description":"V knihovn\u011b PharStreamWrapper, poskytuj\u00edc\u00ed zpracovatele pro ochranu 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