{"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\/cs\/blog\/news\/uyazvimost-v-polkit-pozvolyayushhaya-povysit-svoi-privilegii-v-sisteme","title":{"rendered":"Zranitelnost v Polkit, kter\u00e1 umo\u017e\u0148uje zv\u00fd\u0161it privilegium v syst\u00e9mu","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V komponent\u011b Polkit, kter\u00e1 se pou\u017e\u00edv\u00e1 v distribuc\u00edch pro organizaci prov\u00e1d\u011bn\u00ed akc\u00ed neprivilegovan\u00fdmi u\u017eivateli vy\u017eaduj\u00edc\u00edmi zv\u00fd\u0161en\u00e1 pr\u00e1va (nap\u0159\u00edklad p\u0159ipojen\u00ed USB disku), byla zji\u0161t\u011bna zranitelnost (CVE-2021-3560), kter\u00e1 umo\u017e\u0148uje m\u00edstn\u00edmu u\u017eivateli z\u00edskat pr\u00e1va root v syst\u00e9mu. Zranitelnost byla opravena ve verzi Polkit 0.119. <\/p>\n

Probl\u00e9m se projevuje od vyd\u00e1n\u00ed 0.113, ale mnoho distribuc\u00ed, v\u010detn\u011b RHEL, Ubuntu, Debian a SUSE, zp\u011btn\u011b portovalo zranitelnou funk\u010dnost do bal\u00ed\u010dk\u016f vych\u00e1zej\u00edc\u00edch z star\u0161\u00edch verz\u00ed Polkit (opravy bal\u00ed\u010dk\u016f jsou ji\u017e k dispozici v distribuc\u00edch). <\/p>\n

Probl\u00e9m se projevuje ve funkci polkit_system_bus_name_get_creds_sync(), kter\u00e1 z\u00edsk\u00e1v\u00e1 identifik\u00e1tory (uid a pid) procesu po\u017eaduj\u00edc\u00edho zv\u00fd\u0161en\u00ed opr\u00e1vn\u011bn\u00ed. Proces je Polkit identifikov\u00e1n prost\u0159ednictv\u00edm p\u0159id\u011blen\u00ed jedine\u010dn\u00e9ho jm\u00e9na v DBus, kter\u00e9 se n\u00e1sledn\u011b pou\u017e\u00edv\u00e1 pro kontrolu opr\u00e1vn\u011bn\u00ed. Pokud se proces odpoj\u00ed od dbus-daemon t\u011bsn\u011b p\u0159ed spu\u0161t\u011bn\u00edm zpracovatele polkit_system_bus_name_get_creds_sync, pak m\u00edsto jedine\u010dn\u00e9ho jm\u00e9na zpracovatel dostane k\u00f3d chyby. <\/p>\n

Zranitelnost je zp\u016fsobena t\u00edm, \u017ee vr\u00e1cen\u00fd k\u00f3d chyby nen\u00ed spr\u00e1vn\u011b zpracov\u00e1n a funkce polkit_system_bus_name_get_creds_sync() vrac\u00ed hodnotu TRUE nam\u00edsto FALSE, p\u0159esto\u017ee se j\u00ed nepoda\u0159ilo p\u0159i\u0159adit proces k uid\/pid a zkontrolovat po\u017eadovan\u00e1 opr\u00e1vn\u011bn\u00ed pro tento proces. K\u00f3d, ze kter\u00e9ho byla vol\u00e1na funkce polkit_system_bus_name_get_creds_sync(), se domn\u00edv\u00e1, \u017ee byla kontrola \u00fasp\u011b\u0161n\u00e1 a \u017e\u00e1dost o zv\u00fd\u0161en\u00ed opr\u00e1vn\u011bn\u00ed p\u0159i\u0161la od root, nikoli od neprivilegovan\u00e9ho u\u017eivatele, co\u017e umo\u017e\u0148uje prov\u00e1d\u011bt privilegovan\u00e9 akce bez dal\u0161\u00ed autentizace a potvrzen\u00ed opr\u00e1vn\u011bn\u00ed.
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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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 \u0432\u044b\u043f\u0443\u0441\u043a\u0430 0.113, \u043d\u043e \u043c\u043d\u043e\u0433\u0438\u0435 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