{"id":101551,"date":"2021-10-06T04:22:36","date_gmt":"2021-10-06T02:22:36","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-http-servere-apache-2-4-49-pozvolyayushhaya-poluchit-fajly-vne-kornya-sajta"},"modified":"2021-10-06T04:22:36","modified_gmt":"2021-10-06T02:22:36","slug":"uyazvimost-v-http-servere-apache-2-4-49-pozvolyayushhaya-poluchit-fajly-vne-kornya-sajta","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/news\/uyazvimost-v-http-servere-apache-2-4-49-pozvolyayushhaya-poluchit-fajly-vne-kornya-sajta","title":{"rendered":"Zranite\u013enos\u0165 v http serveri Apache 2.4.49, ktor\u00e1 umo\u017e\u0148uje pr\u00edstup k s\u00faborom mimo kore\u0148ov\u00e9ho adres\u00e1ra webu","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V n\u00fadzovom re\u017eime bolo vydan\u00e9 aktualizovanie http servera Apache 2.4.50, ktor\u00fdm bola odstr\u00e1nen\u00e1 akt\u00edvne zneu\u017e\u00edvan\u00e1 0-day zranite\u013enos\u0165 (CVE-2021-41773), umo\u017e\u0148uj\u00faca pr\u00edstup k s\u00faborom z oblast\u00ed mimo kore\u0148ov\u00e9ho adres\u00e1ra webu. Pomocou tejto zranite\u013enosti je mo\u017en\u00e9 nahra\u0165 \u013eubovo\u013en\u00e9 syst\u00e9mov\u00e9 s\u00fabory a zdrojov\u00e9 k\u00f3dy webov\u00fdch skriptov, ktor\u00e9 s\u00fa pr\u00edstupn\u00e9 na \u010d\u00edtanie pou\u017e\u00edvate\u013eovi, pod ktor\u00fdm je http server spusten\u00fd. V\u00fdvoj\u00e1ri boli o probl\u00e9me informovan\u00ed u\u017e 17. septembra, ale dok\u00e1zali vydanie aktualiz\u00e1cie zrealizova\u0165 a\u017e dnes, po tom, \u010do boli zaznamenan\u00e9 pr\u00edpady zneu\u017e\u00edvania zranite\u013enosti na \u00fatoky na weby. <\/p>\n

Nebezpe\u010dnos\u0165 zranite\u013enosti zmier\u0148uje skuto\u010dnos\u0165, \u017ee probl\u00e9m sa vyskytuje iba v ned\u00e1vno vydanej verzii 2.4.49 a net\u00fdka sa v\u0161etk\u00fdch predch\u00e1dzaj\u00facich verzi\u00ed. V stabiln\u00fdch vetv\u00e1ch konzervat\u00edvnych serverov\u00fdch distrib\u00faci\u00ed verzia 2.4.49 e\u0161te nebola pou\u017eit\u00e1 (Debian, RHEL, Ubuntu, SUSE), ale probl\u00e9m sa dotkol neust\u00e1le aktualizovan\u00fdch distrib\u00faci\u00ed ako Fedora, Arch Linux a Gentoo, ako aj portov FreeBSD. <\/p>\n

Zranite\u013enos\u0165 je sp\u00f4soben\u00e1 chybou, ktor\u00e1 vznikla pri prer\u00e1bke k\u00f3du na normaliz\u00e1ciu ciest v URI, v d\u00f4sledku ktorej sa k\u00f3dovan\u00fd znak bodky pomocou sekvencie «» v ceste normalizoval, ak mu predch\u00e1dzala \u010fal\u0161ia bodka. T\u00fdm sa stala mo\u017en\u00e1 n\u00e1hrada neupraven\u00fdch znakov «..» v v\u00fdslednej ceste prostredn\u00edctvom uvedenia v po\u017eiadavke sekvencie «.». Napr\u00edklad po\u017eiadavka typu «https:\/\/example.com\/cgi-bin\/.\/.\/.\/.\/etc\/passwd» alebo «https:\/\/example.com\/cgi-bin\/.\/\/\/\/etc\/hosts» umo\u017enila z\u00edska\u0165 obsah s\u00faboru «\/etc\/passwd». <\/p>\n

Probl\u00e9m sa neprejavuje, ak je pr\u00edstup k adres\u00e1rom v\u00fdslovne zak\u00e1zan\u00fd pomocou nastavenia 'require all denied'. Napr\u00edklad na \u010diasto\u010dn\u00fa ochranu m\u00f4\u017eete uvies\u0165 v konfigura\u010dnom s\u00fabore: require all denied <\/p>\n

Vo verzii Apache httpd 2.4.50 bola tie\u017e odstr\u00e1nen\u00e1 \u010fal\u0161ia zranite\u013enos\u0165 (CVE-2021-41524), ktor\u00e1 sa t\u00fdkala modulu implementuj\u00faceho protokol HTTP\\\/2. Zranite\u013enos\u0165 umo\u017e\u0148ovala poslan\u00edm \u0161peci\u00e1lne form\u00e1tovanej po\u017eiadavky iniciova\u0165 dereferencovanie null pointera a sp\u00f4sobi\u0165 p\u00e1d procesu. T\u00e1to zranite\u013enos\u0165 sa tie\u017e prejavuje iba vo verzii 2.4.49. Ako obch\u00e1dzaj\u00faci ochrann\u00fd mechanizmus je mo\u017en\u00e9 vypn\u00fa\u0165 podporu protokolu HTTP\\\/2.
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u044d\u043a\u0441\u0442\u0440\u0435\u043d\u043d\u043e\u043c \u043f\u043e\u0440\u044f\u0434\u043a\u0435 \u0441\u0444\u043e\u0440\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u043e \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0435 http-\u0441\u0435\u0440\u0432\u0435\u0440\u0430 Apache 2.4.50, \u0432 \u043a\u043e\u0442\u043e\u0440\u043e\u043c \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0443\u0436\u0435 \u0430\u043a\u0442\u0438\u0432\u043d\u043e \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0438\u0440\u0443\u0435\u043c\u0430\u044f 0-day \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2021-41773), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u0434\u043e\u0441\u0442\u0443\u043f \u043a \u0444\u0430\u0439\u043b\u0430\u043c \u0438\u0437 \u043e\u0431\u043b\u0430\u0441\u0442\u0435\u0439 \u0432\u043d\u0435 \u043a\u043e\u0440\u043d\u0435\u0432\u043e\u0433\u043e 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