V bal\u00ed\u010dkov\u00fdch mana\u017e\u00e9roch Nix a Lix bola zaznamenan\u00e1 zranite\u013enos\u0165, ktor\u00e1 umo\u017e\u0148uje vykon\u00e1va\u0165 k\u00f3d s pr\u00e1vami pozadov\u00e9ho procesu, ktor\u00fd v NixOS a mnoh\u00fdmi pou\u017e\u00edvate\u013emi in\u0161talovan\u00fdch verzi\u00e1ch be\u017e\u00ed s u\u017e\u00edvate\u013eom root. Probl\u00e9m (CVE nebol pridelen\u00fd) sa prejavuje v pozadovom procese nix-daemon, ktor\u00fd sa pou\u017e\u00edva na spr\u00edstupnenie neprivilegovan\u00fdm pou\u017e\u00edvate\u013eom pr\u00edstup k zostavovac\u00edm oper\u00e1ci\u00e1m a \u00falo\u017eisku bal\u00edkov. <\/p>\n
Zranite\u013enos\u0165 vznik\u00e1 v d\u00f4sledku nedostatku obmedzenia rekurs\u00edvneho spracovania adres\u00e1rov v k\u00f3de na anal\u00fdzu arch\u00edvov NAR (Nix Archive), \u010do m\u00f4\u017ee by\u0165 vyu\u017eit\u00e9 na iniciovanie vy\u010derpania z\u00e1sobn\u00edka vl\u00e1kien a prep\u00edsanie obsahu hromady (heap), umiestnenej za z\u00e1sobn\u00edkom bez str\u00e1\u017een\u00fdch str\u00e1nok pam\u00e4te. Probl\u00e9m m\u00f4\u017ee by\u0165 zneu\u017eit\u00fd ak\u00fdmko\u013evek pou\u017e\u00edvate\u013eom, ktor\u00fd m\u00f4\u017ee nadviaza\u0165 spojenie s nix-daemon. Predvolene maj\u00fa v\u0161etci pou\u017e\u00edvatelia t\u00fato mo\u017enos\u0165, \u010do im umo\u017e\u0148uje zv\u00fd\u0161i\u0165 svoje privil\u00e9gi\u00e1 na \u00farove\u0148 root v mnoh\u00fdch pou\u017e\u00edvate\u013esk\u00fdch in\u0161tal\u00e1ci\u00e1ch Nix. <\/p>\n
Probl\u00e9m bol vyrie\u0161en\u00fd obmedzen\u00edm \u00farovne rekurzie na 64 vnoren\u00fdch adres\u00e1rov, pridan\u00edm str\u00e1\u017een\u00fdch str\u00e1nok pam\u00e4te medzi z\u00e1sobn\u00edkom a hromadou a implementovan\u00edm dodato\u010dn\u00fdch kontrol symbolick\u00fdch odkazov v NAR. V Nix sa zranite\u013enos\u0165 prejavuje od verzie 2.24.4 a bola odstr\u00e1nen\u00e1 v vydaniach 2.34.7, 2.33.6, 2.32.8, 2.31.5, 2.30.5, 2.29.4 a 2.28.7. V Lix sa zranite\u013enos\u0165 objavila vo verzii 2.93.0 a bola odstr\u00e1nen\u00e1 v aktualiz\u00e1ci\u00e1ch 2.93.4, 2.94.2 a 2.95.2. Bal\u00ed\u010dkov\u00fd mana\u017e\u00e9r Guix zranite\u013enos\u0165 nezasahuje. <\/p>\n
Okrem toho boli v zverejnen\u00fdch aktualiz\u00e1ci\u00e1ch Nix opraven\u00e9 \u010fal\u0161ie zranite\u013enosti (CVE ch\u00fdba) s priemernou \u00farov\u0148ou nebezpe\u010denstva (4,3 z 10). Probl\u00e9m sa objavuje od vydania Nix 2.24.7 a umo\u017e\u0148uje z\u00e1pis s\u00faborov do oblasti mimo kore\u0148ov\u00e9ho adres\u00e1ra, do ktor\u00e9ho sa rozba\u013euje arch\u00edv. Zranite\u013enos\u0165 sa zneu\u017e\u00edva prostredn\u00edctvom vytv\u00e1rania prvkov s absol\u00fatnymi cestami s\u00faborov v tar-s\u00faboroch. Pri rozba\u013eovan\u00ed tak\u00fdchto arch\u00edvov pr\u00edkazom «nix-prefetch-url —unpack» alebo «nix store prefetch-file —unpack» sa s\u00fabory s absol\u00fatnymi cestami extrahuj\u00fa presne tak, ako s\u00fa, bez konverzie na relat\u00edvnu 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\udd47Zranite\u013enosti v Nix a Lix, ktor\u00e9 umo\u017e\u0148uj\u00fa zv\u00fd\u0161i\u0165 privil\u00e9gi\u00e1 v syst\u00e9me | ProHoster","description":"V bal\u00edkov\u00fdch mana\u017e\u00e9roch Nix a Lix bola odhalen\u00e1 zranite\u013enos\u0165, ktor\u00e1 umo\u017e\u0148uje vykonanie k\u00f3du s pr\u00e1vami na pozad\u00ed procesu, pri\u010dom v NixOS a viacu\u017e\u00edvate\u013esk\u00fdch in\u0161tal\u00e1ci\u00e1ch 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Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"