Ve v\u011bt\u0161in\u011b klientsk\u00fdch aplikac\u00ed pro platformu decentralizovan\u00e9 komunikace Matrix byly zji\u0161t\u011bny zranitelnosti (CVE-2021-40823, CVE-2021-40824), kter\u00e9 umo\u017e\u0148uj\u00ed z\u00edskat informace o kl\u00ed\u010d\u00edch pou\u017eit\u00fdch k \u0161ifrov\u00e1n\u00ed zpr\u00e1v v chatech s end-to-end \u0161ifrov\u00e1n\u00edm (E2EE). \u00dato\u010dn\u00edk, kter\u00fd kompromitoval jednoho z u\u017eivatel\u016f chatu, m\u016f\u017ee de\u0161ifrovat zpr\u00e1vy, kter\u00e9 byly d\u0159\u00edve tomuto u\u017eivateli odesl\u00e1ny z zraniteln\u00fdch klientsk\u00fdch aplikac\u00ed. <\/p>\n
Pro \u00fasp\u011b\u0161nou exploataci je nutn\u00fd p\u0159\u00edstup k \u00fa\u010dtu p\u0159\u00edjemce zpr\u00e1v. Tento p\u0159\u00edstup m\u016f\u017ee b\u00fdt z\u00edsk\u00e1n bu\u010f prost\u0159ednictv\u00edm \u00faniku \u00fadaj\u016f o \u00fa\u010dtu, nebo hackem Matrix-serveru, p\u0159es kter\u00fd se u\u017eivatel p\u0159ipojuje. Nejv\u011bt\u0161\u00ed nebezpe\u010d\u00ed zranitelnosti p\u0159edstavuj\u00ed pro u\u017eivatele \u0161ifrovan\u00fdch chatovac\u00edch m\u00edstnost\u00ed, kter\u00e9 jsou p\u0159ipojeny k Matrix-server\u016fm kontrolovan\u00fdm \u00fato\u010dn\u00edky. Spr\u00e1vci takov\u00fdch servery<\/a> se mohou pokusit vyd\u00e1vat za u\u017eivatele serveru a zachyt\u00e1vat zpr\u00e1vy odes\u00edlan\u00e9 do chatu z zraniteln\u00fdch klientsk\u00fdch aplikac\u00ed. <\/p>\n Zranitelnosti jsou zp\u016fsobeny logick\u00fdmi chybami v implementac\u00edch mechanismu poskytov\u00e1n\u00ed op\u011btovn\u00e9ho p\u0159\u00edstupu ke kl\u00ed\u010d\u016fm, navr\u017een\u00fdch v matrix-js-sdk < 12.4.1 (CVE-2021-40823), matrix-android-sdk2 < 1.2.2 (CVE-2021-40824), matrix-rust-sdk < 0.4.0, FamedlySDK < 0.5.0 a Nheko \u2264 0.8.2. Implementace zalo\u017een\u00e9 na knihovn\u00e1ch matrix-ios-sdk, matrix-nio a libolm nejsou zraniteln\u00e9. <\/p>\n Zranitelnosti se tedy projevuj\u00ed ve v\u0161ech aplikac\u00edch, kter\u00e9 si p\u0159ivlastnily problematick\u00fd k\u00f3d, a p\u0159\u00edmo se net\u00fdkaj\u00ed protokol\u016f Matrix a Olm\/Megolm. Tato probl\u00e9m se konkr\u00e9tn\u011b t\u00fdk\u00e1 hlavn\u00edho Matrix-klienta Element (b\u00fdval\u00fd Riot) pro web, desktopov\u00e9 syst\u00e9my a Android, jako\u017e i t\u0159et\u00edch stran klientsk\u00e9 aplikace a knihovny, v\u010detn\u011b FluffyChat, Nheko, Cinny a SchildiChat. Probl\u00e9m se neprojevuje v ofici\u00e1ln\u00edm klientovi pro platformu iOS, ani v aplikac\u00edch Chatty, Hydrogen, mautrix, purple-matrix a Syphon. <\/p>\n Zranitelnosti byly odhaleny b\u011bhem bezpe\u010dnostn\u00edho auditu klienta Element. Opravy byly ji\u017e vyd\u00e1ny pro v\u0161echny problematick\u00e9 klienty. U\u017eivatel\u016fm se doporu\u010duje okam\u017eit\u011b nainstalovat aktualizace, a p\u0159ed instalac\u00ed aktualizac\u00ed p\u0159ev\u00e9st klienty do offline re\u017eimu. D\u016fkazy o zneu\u017e\u00edv\u00e1n\u00ed zranitelnosti p\u0159ed publikov\u00e1n\u00edm opravy nebyly nalezeny. Podle standardn\u00edch log\u016f klienta a serveru<\/a> Ur\u010dit fakt \u00fatoku je nemo\u017en\u00e9, ale proto\u017ee pro \u00fatok je nutn\u00e1 kompromitace \u00fa\u010dtu, mohou spr\u00e1vci analyzovat p\u0159\u00edtomnost podez\u0159el\u00fdch p\u0159ihl\u00e1\u0161en\u00ed v protokolech autentizace na sv\u00fdch serverech, zat\u00edmco u\u017eivatel\u00e9 mohou posoudit seznam za\u0159\u00edzen\u00ed p\u0159ipojen\u00fdch k jejich \u00fa\u010dtu z hlediska ned\u00e1vn\u00fdch opakovan\u00fdch p\u0159ipojen\u00ed a zm\u011bny stavu d\u016fv\u011bry. <\/p>\n Mechanismus op\u011btovn\u00e9ho p\u0159\u00edstupu k kl\u00ed\u010d\u016fm (key sharing), v jeho\u017e implementaci byly nalezeny zranitelnosti, umo\u017e\u0148uje klientovi, kter\u00fd nem\u00e1 kl\u00ed\u010de pro de\u0161ifrov\u00e1n\u00ed zpr\u00e1vy, po\u017e\u00e1dat o kl\u00ed\u010de od odes\u00edlac\u00edho za\u0159\u00edzen\u00ed nebo jin\u00fdch jeho za\u0159\u00edzen\u00ed. Nap\u0159\u00edklad takov\u00e1 mo\u017enost je nezbytn\u00e1 pro zaji\u0161t\u011bn\u00ed de\u0161ifrov\u00e1n\u00ed star\u00fdch zpr\u00e1v na nov\u00e9m za\u0159\u00edzen\u00ed u\u017eivatele nebo v p\u0159\u00edpad\u011b ztr\u00e1ty kl\u00ed\u010d\u016f, kter\u00e9 u\u017eivatel m\u011bl. Specifikace protokolu p\u0159edepsala, \u017ee standardn\u00ed reakc\u00ed na \u017e\u00e1dosti o kl\u00ed\u010de je neodpov\u00eddat a kl\u00ed\u010de automaticky odes\u00edlat pouze ov\u011b\u0159en\u00fdm za\u0159\u00edzen\u00edm t\u00e9ho\u017e u\u017eivatele. Bohu\u017eel, v praktick\u00fdch implementac\u00edch tato po\u017eadavek nebyl zaji\u0161t\u011bn a \u017e\u00e1dosti o odesl\u00e1n\u00ed kl\u00ed\u010d\u016f byly zpracov\u00e1v\u00e1ny bez pat\u0159i\u010dn\u00e9 identifikace za\u0159\u00edzen\u00ed. \u0412 \u0431\u043e\u043b\u044c\u0448\u0438\u043d\u0441\u0442\u0432\u0435 \u043a\u043b\u0438\u0435\u043d\u0442\u0441\u043a\u0438\u0445 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0439 \u0434\u043b\u044f \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u044b \u0434\u0435\u0446\u0435\u043d\u0442\u0440\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u043a\u043e\u043c\u043c\u0443\u043d\u0438\u043a\u0430\u0446\u0438\u0439 Matrix \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u044b \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (CVE-2021-40823, CVE-2021-40824), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0435 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u0441\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u043e \u043a\u043b\u044e\u0447\u0430\u0445, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u0434\u043b\u044f \u043f\u0435\u0440\u0435\u0434\u0430\u0447\u0438 \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u0439 \u0432 \u0447\u0430\u0442\u0430\u0445 \u0441\u043e \u0441\u043a\u0432\u043e\u0437\u043d\u044b\u043c \u0448\u0438\u0444\u0440\u043e\u0432\u0430\u043d\u0438\u0435\u043c (E2EE). \u0410\u0442\u0430\u043a\u0443\u044e\u0449\u0438\u0439, \u0441\u043a\u043e\u043c\u043f\u0440\u043e\u043c\u0435\u0442\u0438\u0440\u043e\u0432\u0430\u0432 \u043e\u0434\u043d\u043e\u0433\u043e \u0438\u0437 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u0447\u0430\u0442\u0430, \u043c\u043e\u0436\u0435\u0442 \u0440\u0430\u0441\u0448\u0438\u0444\u0440\u043e\u0432\u0430\u0442\u044c \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u044f, \u0440\u0430\u043d\u0435\u0435 \u043e\u0442\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u043d\u044b\u0435 \u044d\u0442\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u0438\u0437 \u0443\u044f\u0437\u0432\u0438\u043c\u044b\u0445 \u043a\u043b\u0438\u0435\u043d\u0442\u0441\u043a\u0438\u0445 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0439. \u0414\u043b\u044f \u0443\u0441\u043f\u0435\u0448\u043d\u043e\u0439 \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438 \u0442\u0440\u0435\u0431\u0443\u0435\u0442\u0441\u044f \u043d\u0430\u043b\u0438\u0447\u0438\u0435 \u0434\u043e\u0441\u0442\u0443\u043f\u0430 \u043a \u0443\u0447\u0451\u0442\u043d\u043e\u0439 \u0437\u0430\u043f\u0438\u0441\u0438 \u043f\u043e\u043b\u0443\u0447\u0430\u0442\u0435\u043b\u044f […]<\/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-101267","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 klientech Matrix, kter\u00e9 umo\u017e\u0148uj\u00ed odhalen\u00ed kl\u00ed\u010d\u016f \u0161ifrov\u00e1n\u00ed koncov\u00e9ho bodu | ProHoster","description":"Ve v\u011bt\u0161in\u011b klientsk\u00fdch aplikac\u00ed pro platformu decentralizovan\u00fdch komunikac\u00ed Matrix byly zji\u0161t\u011bny zranitelnosti (CVE-2021-40823, CVE-2021-40824), kter\u00e9 umo\u017e\u0148uj\u00ed z\u00edsk\u00e1n\u00ed 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Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"