Ve standardn\u00ed knihovn\u011b jazyka Rust byla zji\u0161t\u011bna zranitelnost (CVE-2022-21658) souvisej\u00edc\u00ed se z\u00e1vodem p\u0159i vol\u00e1n\u00ed funkce std::fs::remove_dir_all(). Pokud je tato funkce pou\u017eita k odstran\u011bn\u00ed do\u010dasn\u00fdch soubor\u016f v privilegovan\u00e9 aplikaci, m\u016f\u017ee \u00fato\u010dn\u00edk dos\u00e1hnout odstran\u011bn\u00ed libovoln\u00fdch syst\u00e9mov\u00fdch soubor\u016f a adres\u00e1\u0159\u016f, ke kter\u00fdm by norm\u00e1ln\u011b nem\u011bl p\u0159\u00edstup. <\/p>\n
Zranitelnost je zp\u016fsobena nespr\u00e1vnou implementac\u00ed kontroly symbolick\u00fdch odkaz\u016f p\u0159ed rekurzivn\u00edm maz\u00e1n\u00edm adres\u00e1\u0159\u016f. M\u00edsto toho, aby zak\u00e1zala sledov\u00e1n\u00ed symbolick\u00fdch odkaz\u016f, funkce remove_dir_all() nejprve zji\u0161\u0165uje, zda je soubor symbolick\u00fd odkaz. Pokud je odkaz definov\u00e1n, je odstran\u011bn jako soubor, a pokud je to adres\u00e1\u0159 \u2014 je vyvol\u00e1na operace rekurzivn\u00edho odstran\u011bn\u00ed obsahu. Probl\u00e9m spo\u010d\u00edv\u00e1 v tom, \u017ee mezi kontrolou a za\u010d\u00e1tkem operace odstran\u011bn\u00ed existuje mal\u00e1 prodleva. <\/p>\n
V okam\u017eiku, kdy byla kontrola ji\u017e provedena, ale operace proch\u00e1zen\u00ed adres\u00e1\u0159\u016f pro odstran\u011bn\u00ed je\u0161t\u011b neza\u010dala, m\u016f\u017ee \u00fato\u010dn\u00edk nahradit adres\u00e1\u0159 s do\u010dasn\u00fdmi soubory symbolick\u00fdm odkazem. Pokud se to povede v spr\u00e1vn\u00fd moment, funkce remove_dir_all() zpracuje symbolick\u00fd odkaz jako adres\u00e1\u0159 a za\u010dne odstra\u0148ovat obsah, na kter\u00fd odkaz tento odkaz sm\u011b\u0159uje. I kdy\u017e \u00fasp\u011bch \u00fatoku z\u00e1vis\u00ed na p\u0159esnosti zvolen\u00e9ho \u010dasu pro v\u00fdm\u011bnu adres\u00e1\u0159e a je nepravd\u011bpodobn\u00e9, \u017ee se to poda\u0159\u00ed na prvn\u00ed pokus, b\u011bhem experiment\u016f se v\u00fdzkumn\u00edk\u016fm poda\u0159ilo dos\u00e1hnout opakovateln\u00e9ho \u00fasp\u011bchu \u00fatoku po spu\u0161t\u011bn\u00ed exploit b\u011bhem n\u011bkolika sekund. <\/p>\n
V\u0161echny verze Rust od 1.0.0 do 1.58.0 v\u010detn\u011b jsou n\u00e1chyln\u00e9 k t\u00e9to zranitelnosti. Probl\u00e9m byl dosud vy\u0159e\u0161en ve form\u011b opravn\u00e9ho bal\u00ed\u010dku (oprava bude zahrnuta v vyd\u00e1n\u00ed 1.58.1, kter\u00e9 se o\u010dek\u00e1v\u00e1 b\u011bhem n\u011bkolika hodin). Sledovat odstran\u011bn\u00ed zranitelnosti v distribuc\u00edch lze na t\u011bchto str\u00e1nk\u00e1ch: Debian, RHEL, SUSE, Fedora, Ubuntu, Arch, FreeBSD. V\u0161em u\u017eivatel\u016fm program\u016f napsan\u00fdch v jazyce Rust, kter\u00e9 jsou spou\u0161t\u011bny s privilegovan\u00fdmi pr\u00e1vy a vyu\u017e\u00edvaj\u00ed funkci remove_dir_all, se d\u016frazn\u011b doporu\u010duje urgentn\u011b aktualizovat Rust na verzi 1.58.1. Zaj\u00edmav\u00e9 je, \u017ee vydan\u00fd patch probl\u00e9m ne\u0159e\u0161\u00ed na v\u0161ech syst\u00e9mech, nap\u0159\u00edklad v OS REDOX a v macOS verz\u00edch p\u0159ed 10.10 (Yosemite) zranitelnost nen\u00ed blokov\u00e1na kv\u016fli absenci p\u0159\u00edznaku O_NOFOLLOW, kter\u00fd zakazuje sledov\u00e1n\u00ed symbolick\u00fdch odkaz\u016f. \u0412 \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043d\u043e\u0439 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0435 \u044f\u0437\u044b\u043a\u0430 Rust \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-21658), \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u0430\u044f \u0441 \u0441\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0435\u043c \u0433\u043e\u043d\u043a\u0438 \u0432 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 std::fs::remove_dir_all(). \u0412 \u0441\u043b\u0443\u0447\u0430\u0435 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u044f 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\u0443\u0441\u043b\u043e\u0432\u0438\u044f\u0445 \u0443 \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0435\u0433\u043e \u043d\u0435\u0442 \u0434\u043e\u0441\u0442\u0443\u043f\u0430. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u043d\u0435\u043a\u043e\u0440\u0440\u0435\u043a\u0442\u043d\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0435\u0439 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u0441\u0438\u043c\u0432\u043e\u043b\u0438\u0447\u0435\u0441\u043a\u0438\u0445 \u0441\u0441\u044b\u043b\u043e\u043a \u043f\u0435\u0440\u0435\u0434 \u0440\u0435\u043a\u0443\u0440\u0441\u0438\u0432\u043d\u044b\u043c […]<\/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-103040","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 ve standardn\u00ed knihovn\u011b jazyka Rust | ProHoster","description":"V standardn\u00ed knihovn\u011b jazyka Rust byla odhalena zranitelnost (CVE-2022-21658) souvisej\u00edc\u00ed se z\u00e1vodem v podm\u00ednk\u00e1ch ve funkci 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\u044f\u0437\u044b\u043a\u0430 Rust | ProHoster","og:description":"\u0412 \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043d\u043e\u0439 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0435 \u044f\u0437\u044b\u043a\u0430 Rust \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-21658), \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u0430\u044f \u0441 \u0441\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0435\u043c \u0433\u043e\u043d\u043a\u0438 \u0432 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 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Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"