V bal\u00ed\u010dkov\u00fdch mana\u017eerech Nix a Lix byla odhalena zranitelnost, kter\u00e1 umo\u017e\u0148uje vykonat k\u00f3d s pr\u00e1vy na pozad\u00ed procesu, kter\u00fd v NixOS a v\u00edceu\u017eivatelsk\u00fdch instalac\u00edch b\u011b\u017e\u00ed pod u\u017eivatelsk\u00fdm \u00fa\u010dtem root. Probl\u00e9m (CVE nebylo p\u0159i\u0159azeno) se projevuje v pozad\u00ed procesu nix-daemon, kter\u00fd se pou\u017e\u00edv\u00e1 k zaji\u0161t\u011bn\u00ed p\u0159\u00edstupu nep\u0159id\u011blen\u00fdch u\u017eivatel\u016f k opera\u010dn\u00edm proces\u016fm a \u00falo\u017ei\u0161ti bal\u00ed\u010dk\u016f. <\/p>\n
Zranitelnost vznik\u00e1 z d\u016fvodu nedostatku omezen\u00ed na rekurzivn\u00ed zpracov\u00e1n\u00ed adres\u00e1\u0159\u016f ve k\u00f3du pro zpracov\u00e1n\u00ed archiv\u016f NAR (Nix Archive), co\u017e m\u016f\u017ee b\u00fdt pou\u017eito k iniciaci vy\u010derp\u00e1n\u00ed z\u00e1sobn\u00edku vl\u00e1ken a p\u0159eps\u00e1n\u00ed obsahu haldy (heap) um\u00edst\u011bn\u00e9 za z\u00e1sobn\u00edkem bez str\u00e1\u017en\u00edch str\u00e1nek pam\u011bti. Probl\u00e9m m\u016f\u017ee b\u00fdt zneu\u017eit jak\u00fdmkoli u\u017eivatelem, kter\u00fd m\u016f\u017ee nav\u00e1zat spojen\u00ed s nix-daemon. V\u00fdchoz\u00ed konfigurace umo\u017e\u0148uje v\u0161em u\u017eivatel\u016fm to prov\u00e9st, co\u017e umo\u017e\u0148uje pov\u00fd\u0161en\u00ed jejich opr\u00e1vn\u011bn\u00ed na u\u017eivatelsk\u00fd \u00fa\u010det root v v\u00edceu\u017eivatelsk\u00fdch instalac\u00edch Nix. <\/p>\n
Probl\u00e9m byl vy\u0159e\u0161en omezen\u00edm \u00farovn\u011b rekurze na 64 vno\u0159en\u00fdch adres\u00e1\u0159\u016f, p\u0159id\u00e1n\u00edm str\u00e1\u017en\u00edch str\u00e1nek pam\u011bti mezi z\u00e1sobn\u00edkem a haldou a implementac\u00ed dal\u0161\u00edch kontrol symbolick\u00fdch odkaz\u016f v NAR. V Nix se zranitelnost projevuje od verze 2.24.4 a byla odstran\u011bna v vyd\u00e1n\u00edch 2.34.7, 2.33.6, 2.32.8, 2.31.5, 2.30.5, 2.29.4, 2.28.7. Ve Lix zranitelnost vznikla v vyd\u00e1n\u00ed 2.93.0 a byla odstran\u011bna v aktualizac\u00edch 2.93.4, 2.94.2 a 2.95.2. Bal\u00ed\u010dkov\u00fd mana\u017eer Guix zranitelnost neovliv\u0148uje. <\/p>\n
Krom\u011b toho byla v publikovan\u00fdch aktualizac\u00edch Nix odstran\u011bna dal\u0161\u00ed zranitelnost (CVE chyb\u00ed), kter\u00e9 byl p\u0159id\u011blen st\u0159edn\u00ed stupe\u0148 z\u00e1va\u017enosti (4,3 z 10). Probl\u00e9m se projevuje od verze Nix 2.24.7 a umo\u017e\u0148uje zapisov\u00e1n\u00ed soubor\u016f do oblasti mimo ko\u0159enov\u00fd adres\u00e1\u0159, do kter\u00e9ho se rozbaluj\u00ed archivy. Zranitelnost je zneu\u017eiteln\u00e1 prost\u0159ednictv\u00edm vytv\u00e1\u0159en\u00ed prvk\u016f s absolutn\u00edmi cestami k soubor\u016fm v tar-archivn\u00edch souborech. P\u0159i rozbalov\u00e1n\u00ed takov\u00fdch archiv\u016f p\u0159\u00edkazem «nix-prefetch-url —unpack» nebo «nix store prefetch-file —unpack» se soubory s absolutn\u00edmi cestami extrahuj\u00ed tak, jak jsou, bez p\u0159evodu na relativn\u00ed cestu. \u0412 \u043f\u0430\u043a\u0435\u0442\u043d\u044b\u0445 \u043c\u0435\u043d\u0435\u0434\u0436\u0435\u0440\u0430\u0445 Nix \u0438 Lix \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043a\u043e\u0434 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 \u0444\u043e\u043d\u043e\u0432\u043e\u0433\u043e \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0430, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u0432 NixOS \u0438 \u043c\u043d\u043e\u0433\u043e\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u0441\u043a\u0438\u0445 \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0430\u0445 \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u0442\u0441\u044f \u043f\u043e\u0434 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u043c root. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 (CVE \u043d\u0435 \u043f\u0440\u0438\u0441\u0432\u043e\u0435\u043d) \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0432 \u0444\u043e\u043d\u043e\u0432\u043e\u043c \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0435 nix-daemon, \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u043e\u043c \u0434\u043b\u044f \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u0430\u0446\u0438\u0438 \u0434\u043e\u0441\u0442\u0443\u043f\u0430 \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u043a \u0441\u0431\u043e\u0440\u043e\u0447\u043d\u044b\u043c \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u044f\u043c \u0438 \u0445\u0440\u0430\u043d\u0438\u043b\u0438\u0449\u0443 \u043f\u0430\u043a\u0435\u0442\u043e\u0432. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432\u043e\u0437\u043d\u0438\u043a\u0430\u0435\u0442 \u0438\u0437-\u0437\u0430 \u043e\u0442\u0441\u0443\u0442\u0441\u0442\u0432\u0438\u044f \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u0438\u044f \u0440\u0435\u043a\u0443\u0440\u0441\u0438\u0432\u043d\u043e\u0439 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u0434\u0438\u0440\u0435\u043a\u0442\u043e\u0440\u0438\u0439 \u0432 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-170428","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\udd47Zranitelnosti v Nix a Lix, kter\u00e9 umo\u017e\u0148uj\u00ed zv\u00fd\u0161en\u00ed opr\u00e1vn\u011bn\u00ed v syst\u00e9mu | ProHoster","description":"V bal\u00ed\u010dkov\u00fdch mana\u017eerech Nix a Lix byla odhalena zranitelnost, kter\u00e1 umo\u017e\u0148uje vykonat k\u00f3d s pr\u00e1vy na pozad\u00ed procesu, kter\u00fd v NixOS a v\u00edceu\u017eivatelsk\u00fdch instalac\u00edch b\u011b\u017e\u00ed pod 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Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"