{"id":116209,"date":"2024-05-30T15:40:12","date_gmt":"2024-05-30T13:40:12","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/proekt-xz-opublikoval-rezultat-audita-kommitov-i-pervoe-obnovlenie-posle-vyyavleniya-bekdora"},"modified":"2024-05-30T15:40:12","modified_gmt":"2024-05-30T13:40:12","slug":"proekt-xz-opublikoval-rezultat-audita-kommitov-i-pervoe-obnovlenie-posle-vyyavleniya-bekdora","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/proekt-xz-opublikoval-rezultat-audita-kommitov-i-pervoe-obnovlenie-posle-vyyavleniya-bekdora","title":{"rendered":"Projekt XZ publikoval v\u00fdsledek auditu commit\u016f a prvn\u00ed aktualizaci po odhalen\u00ed backdooru","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Lasse Collin, star\u00fd spr\u00e1vce projektu xz, kter\u00fd v roce 2022 p\u0159edal pr\u00e1va nov\u00e9mu spr\u00e1vci Jia Tanovi, jeho\u017e \u010dinnost vedla k implementaci backdooru, publikoval opravy bal\u00ed\u010dku XZ Utils 5.2.13, 5.4.7 a 5.6.2, ve kter\u00fdch byly odstran\u011bny komponenty backdooru a dal\u0161\u00ed podez\u0159el\u00e9 zm\u011bny, kter\u00e9 byly p\u0159id\u00e1ny v d\u016fsledku \u0161kodliv\u00e9 \u010dinnosti p\u0159edchoz\u00edho spr\u00e1vce. <\/p>\n

D\u00e1le byla zve\u0159ejn\u011bna zpr\u00e1va o recenzov\u00e1n\u00ed Git repozit\u00e1\u0159e a zm\u011bn, kter\u00e9 byly p\u0159id\u00e1ny od prosince 2022 b\u011bhem p\u016fsoben\u00ed Jia Tana jako spr\u00e1vce. Zm\u011bny byly rozebr\u00e1ny na \u00farovni jednotliv\u00fdch commit\u016f. Commity v repozit\u00e1\u0159i nebyly podeps\u00e1ny digit\u00e1ln\u00edm podpisem, ale \u017e\u00e1dn\u00e9 stopy fal\u0161ov\u00e1n\u00ed ze strany autor\u016f commit\u016f nebyly zji\u0161t\u011bny. Celkem bylo z repozit\u00e1\u0159e odstran\u011bno 8 \u0161kodliv\u00fdch commit\u016f. <\/p>\n

Z k\u00f3du zat\u00edm nebyl odstran\u011bn k\u00f3d CRC CLMUL, kter\u00fd zp\u016fsobuje fale\u0161n\u00e9 pozitivn\u00ed detekce p\u0159i kontrole v MSAN (Memory sanitizer) a probl\u00e9my s OSS Fuzz. V budoucnu se pl\u00e1nuje tento k\u00f3d p\u0159epracovat, ale zat\u00edm bylo rozhodnuto jej nem\u011bnit, aby se p\u0159ede\u0161lo regres\u00edm ve star\u00fdch v\u011btv\u00edch. Podez\u0159el\u00e9 zm\u011bny ve star\u00fdch commitech, p\u0159idan\u00e9 p\u0159ed proveden\u00edm zm\u011bn souvisej\u00edc\u00edch s backdoorem, nebyly zji\u0161t\u011bny. Samostatn\u011b byly zkontrolov\u00e1ny po-soubory lokalizace, metadata v tar souborech a archivy s releasemi a p\u0159eklady. <\/p>\n

Mezi zm\u011bnami se tak\u00e9 zaznamen\u00e1v\u00e1 zahrnut\u00ed nahromad\u011bn\u00fdch oprav chyb a odstran\u011bn\u00ed podpory mechanismu IFUNC, poskytovan\u00e9ho v Glibc pro nep\u0159\u00edm\u00e9 vol\u00e1n\u00ed funkc\u00ed, kter\u00fd byl pou\u017eit pro organizaci p\u0159esm\u011brov\u00e1n\u00ed funkc\u00ed v backdooru. Bylo poznamen\u00e1no, \u017ee pou\u017e\u00edv\u00e1n\u00ed IFUNC jen komplikuje k\u00f3d, p\u0159i\u010dem\u017e zisk v v\u00fdkonu z n\u011bj nen\u00ed v\u00fdznamn\u00fd. Jako pojistku byl z bal\u00ed\u010dku se zdrojov\u00fdmi k\u00f3dy tak\u00e9 odstran\u011bn logo XZ, PDF verze man str\u00e1nek a dva testy pro architektury x86 a SPARC, ve kter\u00fdch byly zpracov\u00e1v\u00e1ny objektov\u00e9 soubory jako vstupn\u00ed data. <\/p>\n

Mezi novinkami v dekompresoru xzdec byla p\u0159id\u00e1na podpora 4. verze ABI mechanismu izolace aplikac\u00ed Landlock. Do buildovac\u00edch skript\u016f Autotools byla p\u0159id\u00e1na volba «—enable-doxygen», a do skriptu Cmake parametr ENABLE_DOXYGEN pro generov\u00e1n\u00ed a instalaci dokumentace k API liblzma pomoc\u00ed Doxygen. Ji\u017e vygenerovan\u00e1 dokumentace byla z bal\u00ed\u010dku odstran\u011bna.
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u041b\u0430\u0441\u0441\u0435 \u041a\u043e\u043b\u043b\u0438\u043d (Lasse Collin), \u0441\u0442\u0430\u0440\u044b\u0439 \u0441\u043e\u043f\u0440\u043e\u0432\u043e\u0436\u0434\u0430\u044e\u0449\u0438\u0439 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 xz, \u0432 2022 \u0433\u043e\u0434\u0443 \u043f\u0435\u0440\u0435\u0434\u0430\u0432\u0448\u0438\u0439 \u043f\u0440\u0430\u0432\u0430 \u043d\u043e\u0432\u043e\u043c\u0443 \u0441\u043e\u043f\u0440\u043e\u0432\u043e\u0436\u0434\u0430\u044e\u0449\u0435\u043c\u0443 Jia Tan, \u0434\u0435\u044f\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c \u043a\u043e\u0442\u043e\u0440\u043e\u0433\u043e \u043f\u0440\u0438\u0432\u0435\u043b\u0430 \u043a \u0432\u043d\u0435\u0434\u0440\u0435\u043d\u0438\u044e \u0431\u044d\u043a\u0434\u043e\u0440\u0430, \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0435 \u0432\u044b\u043f\u0443\u0441\u043a\u0438 \u043f\u0430\u043a\u0435\u0442\u0430 XZ Utils 5.2.13, 5.4.7 \u0438 5.6.2, \u0432 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0443\u0434\u0430\u043b\u0435\u043d\u044b \u043a\u043e\u043c\u043f\u043e\u043d\u0435\u043d\u0442\u044b \u0431\u044d\u043a\u0434\u043e\u0440\u0430 \u0438 \u043f\u0440\u043e\u0447\u0438\u0435 \u043f\u043e\u0434\u043e\u0437\u0440\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0435 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f, \u0434\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u043d\u044b\u0435 \u0432 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u0435 \u0432\u0440\u0435\u0434\u043e\u043d\u043e\u0441\u043d\u043e\u0439 \u0434\u0435\u044f\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u043f\u0440\u043e\u0448\u043b\u043e\u0433\u043e \u0441\u043e\u043f\u0440\u043e\u0432\u043e\u0436\u0434\u0430\u044e\u0449\u0435\u0433\u043e. \u041a\u0440\u043e\u043c\u0435 \u0442\u043e\u0433\u043e, \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u043e\u0442\u0447\u0451\u0442 \u043e \u0440\u0435\u0446\u0435\u043d\u0437\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0438 […]<\/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-116209","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\udd47Projekt XZ zve\u0159ejnil v\u00fdsledek auditu p\u0159\u00edsp\u011bvk\u016f a prvn\u00ed aktualizaci po odhalen\u00ed backdooru | ProHoster","description":"Lasse Collin, dlouholet\u00fd spr\u00e1vce projektu xz, v roce 2022 p\u0159edal pr\u00e1va nov\u00e9mu spr\u00e1vci Jia Tanovi, jeho\u017e \u010dinnost vedla k zaveden\u00ed backdooru. 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