{"id":38921,"date":"2019-10-31T22:26:45","date_gmt":"2019-10-31T19:26:45","guid":{"rendered":"https:\/\/prohoster.info\/blog\/uyazvimost-v-sudo-pozvolyaet-vypolnyat-komandy-s-pravami-superpolzovatelya-na-ustrojstvah-s-linux\/"},"modified":"2019-10-31T22:26:45","modified_gmt":"2019-10-31T19:26:45","slug":"uyazvimost-v-sudo-pozvolyaet-vypolnyat-komandy-s-pravami-superpolzovatelya-na-ustrojstvah-s-linux","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/uyazvimost-v-sudo-pozvolyaet-vypolnyat-komandy-s-pravami-superpolzovatelya-na-ustrojstvah-s-linux","title":{"rendered":"Zranitelnost v Sudo umo\u017e\u0148uje vykon\u00e1vat p\u0159\u00edkazy s pr\u00e1vy superu\u017eivatele na za\u0159\u00edzen\u00edch s Linuxem.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Bylo zji\u0161t\u011bno, \u017ee existuje zranitelnost v p\u0159\u00edkazu Sudo (super user do) pro Linux. Vyu\u017eit\u00ed t\u00e9to zranitelnosti umo\u017e\u0148uje nepriviligovan\u00fdm u\u017eivatel\u016fm \u010di program\u016fm vykon\u00e1vat p\u0159\u00edkazy s pr\u00e1vy superu\u017eivatele. Zaznamen\u00e1v\u00e1 se, \u017ee zranitelnost se t\u00fdk\u00e1 syst\u00e9m\u016f s nestandardn\u00edmi nastaven\u00edmi a net\u00fdk\u00e1 se v\u011bt\u0161iny server\u016f b\u011b\u017e\u00edc\u00edch pod Linuxem.<\/p>\n

\"Zranitelnost<\/p>\n

Zranitelnost vznik\u00e1 v p\u0159\u00edpadech, kdy jsou pou\u017eita nastaven\u00ed konfigurace Sudo, kter\u00e1 umo\u017e\u0148uj\u00ed vykon\u00e1v\u00e1n\u00ed p\u0159\u00edkaz\u016f jm\u00e9nem jin\u00fdch u\u017eivatel\u016f. Krom\u011b toho m\u016f\u017ee b\u00fdt Sudo speci\u00e1ln\u011b nakonfigurov\u00e1no, co\u017e umo\u017e\u0148uje spou\u0161t\u011bn\u00ed p\u0159\u00edkaz\u016f jm\u00e9nem jin\u00fdch u\u017eivatel\u016f, krom\u011b superu\u017eivatele. Pro to je nutn\u00e9 prov\u00e9st p\u0159\u00edslu\u0161n\u00e9 \u00fapravy v konfigura\u010dn\u00edm souboru.<\/p>\n

Podstata probl\u00e9mu spo\u010d\u00edv\u00e1 v tom, jak Sudo zpracov\u00e1v\u00e1 identifik\u00e1tory u\u017eivatel\u016f. Pokud zad\u00e1te do p\u0159\u00edkazov\u00e9ho \u0159\u00e1dku identifik\u00e1tor u\u017eivatele -1 nebo jeho ekvivalent 4294967295, m\u016f\u017ee b\u00fdt spou\u0161t\u011bn\u00fd p\u0159\u00edkaz vykon\u00e1n s pr\u00e1vy superu\u017eivatele. Vzhledem k tomu, \u017ee uveden\u00e9 identifik\u00e1tory u\u017eivatel\u016f nejsou uvedeny v datab\u00e1zi hesel, nebude pro proveden\u00ed p\u0159\u00edkazu pot\u0159ebn\u00e9 zad\u00e1vat heslo.<\/p>\n

Aby se sn\u00ed\u017eila pravd\u011bpodobnost probl\u00e9m\u016f spojen\u00fdch s uvedenou zranitelnost\u00ed, u\u017eivatel\u016fm se doporu\u010duje co nejd\u0159\u00edve aktualizovat Sudo na verzi 1.8.28 nebo nov\u011bj\u0161\u00ed. V ozn\u00e1men\u00ed se uv\u00e1d\u00ed, \u017ee v nov\u00e9 verzi Sudo ji\u017e nebude parametr -1 pou\u017e\u00edv\u00e1n jako identifik\u00e1tor u\u017eivatele. To znamen\u00e1, \u017ee \u00fato\u010dn\u00edci nebudou moci tuto zranitelnost zneu\u017e\u00edt.  <\/p>\n

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Zdroj: 3dnews.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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