{"id":100430,"date":"2021-06-04T10:23:35","date_gmt":"2021-06-04T08:23:35","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-polkit-pozvolyayushhaya-povysit-svoi-privilegii-v-sisteme"},"modified":"2021-06-04T10:23:35","modified_gmt":"2021-06-04T08:23:35","slug":"uyazvimost-v-polkit-pozvolyayushhaya-povysit-svoi-privilegii-v-sisteme","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/uyazvimost-v-polkit-pozvolyayushhaya-povysit-svoi-privilegii-v-sisteme","title":{"rendered":"Polkit'i haavatavus, mis v\u00f5imaldab s\u00fcsteemis \u00f5iguste t\u00f5stmist","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Polkit'i komponendis, mida kasutatakse jaotustes, et v\u00f5imaldada madala \u00f5igusega kasutajatel teostada toiminguid, mis vajavad k\u00f5rgendatud \u00f5igusi (n\u00e4iteks USB-m\u00e4luseadmiku mountimisel), on tuvastatud haavatavus (CVE-2021-3560), mis v\u00f5imaldab kohalikel kasutajatel saada s\u00fcsteemis root\u00f5igused. Haavatavus on k\u00f5rvaldatud Polkit'i versioonis 0.119. <\/p>\n

Probleem ilmneb alates versioonist 0.113, kuid paljud jaotused, sealhulgas RHEL, Ubuntu, Debian ja SUSE, on haavatava funktsionaalsuse tagasitoomiseks b\u00e4kportinud pakette vanematelt Polkit'i versioonidelt (pakettide parandused on juba saadaval jaotustes). <\/p>\n

Probleem ilmneb funktsioonis polkit_system_bus_name_get_creds_sync(), mis hankib \u00f5iguste t\u00f5stmiseks taotluse esitanud protsessi ID-d (uid ja pid). Protsess identifitseeritakse Polkit'i poolt, m\u00e4\u00e4rates DBus'is unikaalse nime, mida kasutatakse hiljem privileegide kontrollimiseks. Kui protsess katkestab \u00fchenduse dbus-daemoniga vahetult enne polkit_system_bus_name_get_creds_sync k\u00e4sitleja k\u00e4ivitamist, saab k\u00e4sitleja asemel unikaalse nime veakoodi. <\/p>\n

Haavatavus tuleneb sellest, et tagastatud veakood ei t\u00f6\u00f6delda \u00f5igesti ning funktsioon polkit_system_bus_name_get_creds_sync() tagastab v\u00e4\u00e4rtuse TRUE, mitte FALSE, kuigi ei suuda seostada protsessi uid\/pid-ga ja kontrollida n\u00f5utud privileege. Kood, kust funktsioon polkit_system_bus_name_get_creds_sync() kutsuti, arvab, et kontrollimine oli eduka, ja privileegide t\u00f5stmise taotlus tuli rootilt, mitte privilgeeritud kasutajalt, mis v\u00f5imaldab sooritada privileege k\u00e4sitlevaid toiminguid t\u00e4iendava autentimise ja volituste kinnitamiseta.
\n
Allikas: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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Haavatavus on eemaldatud Polkit versioonis 0.119. Probleem ilmneb alates versioonist 0.113, kuid paljud jaotused, sealhulgas RHEL, Ubuntu, Debian ja SUSE, on haavatava funktsionaalsuse tagasi portinud.","canonical_url":"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/uyazvimost-v-polkit-pozvolyayushhaya-povysit-svoi-privilegii-v-sisteme","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"et_EE","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 Polkit, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043f\u043e\u0432\u044b\u0441\u0438\u0442\u044c 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(\u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u043c\u043e\u043d\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f USB-\u043d\u0430\u043a\u043e\u043f\u0438\u0442\u0435\u043b\u044f), \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2021-3560), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043f\u0440\u0430\u0432\u0430 root \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0432 \u0432\u0435\u0440\u0441\u0438\u0438 Polkit 0.119. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 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