{"id":101267,"date":"2021-09-14T16:22:48","date_gmt":"2021-09-14T14:22:48","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimosti-v-klientah-matrix-pozvolyayushhie-raskryt-klyuchi-skvoznogo-shifrovaniya"},"modified":"2021-09-14T16:22:48","modified_gmt":"2021-09-14T14:22:48","slug":"uyazvimosti-v-klientah-matrix-pozvolyayushhie-raskryt-klyuchi-skvoznogo-shifrovaniya","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/uyazvimosti-v-klientah-matrix-pozvolyayushhie-raskryt-klyuchi-skvoznogo-shifrovaniya","title":{"rendered":"Matrix \u00fcgyfelekben felfedezett sebezhet\u0151s\u00e9gek, amelyek lehet\u0151v\u00e9 teszik az end-to-end titkos\u00edt\u00e1si kulcsok kisziv\u00e1rg\u00e1s\u00e1t.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A decentraliz\u00e1lt kommunik\u00e1ci\u00f3s platform, a Matrix \u00fcgyf\u00e9lalkalmaz\u00e1saiban sz\u00e1mos biztons\u00e1gi r\u00e9st azonos\u00edtottak (CVE-2021-40823, CVE-2021-40824), amelyek lehet\u0151v\u00e9 teszik a titkos\u00edt\u00e1si kulcsokhoz val\u00f3 hozz\u00e1f\u00e9r\u00e9st, amelyeket a v\u00e9gpontok k\u00f6z\u00f6tti titkos\u00edt\u00e1ssal (E2EE) rendelkez\u0151 cseveg\u00e9sek \u00fczeneteinek tov\u00e1bb\u00edt\u00e1s\u00e1hoz haszn\u00e1lnak. A t\u00e1mad\u00f3, aki kompromitt\u00e1lta a cseveg\u00e9s egyik felhaszn\u00e1l\u00f3j\u00e1t, k\u00e9pes lehet visszafejteni a sebezhet\u0151 kliensalkalmaz\u00e1sokb\u00f3l kor\u00e1bban ennek a felhaszn\u00e1l\u00f3nak elk\u00fcld\u00f6tt \u00fczeneteket. <\/p>\n

A sikeres kihaszn\u00e1l\u00e1s \u00e9rdek\u00e9ben sz\u00fcks\u00e9g van a c\u00e9lzott \u00fczenetek c\u00edmzettjeihez val\u00f3 hozz\u00e1f\u00e9r\u00e9sre. A hozz\u00e1f\u00e9r\u00e9s megszerezhet\u0151 a fi\u00f3kparam\u00e9terek kisziv\u00e1rg\u00e1s\u00e1n kereszt\u00fcl vagy a felhaszn\u00e1l\u00f3 \u00e1ltal csatlakoztatott Matrix-szerver felt\u00f6r\u00e9s\u00e9vel. A biztons\u00e1gi r\u00e9sek k\u00fcl\u00f6n\u00f6sen vesz\u00e9lyesek azok sz\u00e1m\u00e1ra, akik titkos\u00edtott cseveg\u0151szob\u00e1kban vannak, ahol a Matrix-szerverek a t\u00e1mad\u00f3k ir\u00e1ny\u00edt\u00e1sa alatt \u00e1llnak. Az ilyen szerverek adminisztr\u00e1torai szerverek<\/a> megpr\u00f3b\u00e1lhatj\u00e1k magukat a szerver felhaszn\u00e1l\u00f3ik\u00e9nt kiadni, hogy elfogj\u00e1k a sebezhet\u0151 kliensalkalmaz\u00e1sokon kereszt\u00fcl k\u00fcld\u00f6tt \u00fczeneteket. <\/p>\n

A biztons\u00e1gi r\u00e9sek a kulcsok \u00fajb\u00f3li el\u00e9rhet\u0151s\u00e9g\u00e9t biztos\u00edt\u00f3 mechanizmusban tal\u00e1lhat\u00f3 logikai hib\u00e1kb\u00f3l erednek, amelyeket a 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 \u00e9s Nheko \u2264 0.8.2 javasolt. A matrix-ios-sdk, matrix-nio \u00e9s libolm alap\u00fa megval\u00f3s\u00edt\u00e1sok nem szenvednek biztons\u00e1gi r\u00e9sekt\u0151l. <\/p>\n

\u00cdgy a biztons\u00e1gi r\u00e9sek megjelennek minden alkalmaz\u00e1sban, amely a probl\u00e9m\u00e1s k\u00f3dot \u00e1tvette, \u00e9s nem \u00e9rintik k\u00f6zvetlen\u00fcl a Matrix \u00e9s Olm\/Megolm protokollokat. K\u00fcl\u00f6n\u00f6sen a probl\u00e9ma \u00e9rinti a f\u0151 Matrix-\u00fcgyfelet, az Elementet (kor\u00e1bban Riot) a Web, asztali rendszerek \u00e9s Android platformokon, valamint a harmadik f\u00e9lt\u0151l sz\u00e1rmaz\u00f3 kliensalkalmaz\u00e1sokat \u00e9s k\u00f6nyvt\u00e1rakat, bele\u00e9rtve a FluffyChat-et, Nheko-t, Cinny-t \u00e9s SchildiChat-et. A probl\u00e9ma nem jelentkezik az iOS platformra k\u00e9sz\u00fclt hivatalos \u00fcgyf\u00e9lben, valamint a Chatty, Hydrogen, mautrix, purple-matrix \u00e9s Syphon alkalmaz\u00e1sokban. <\/p>\n

A biztons\u00e1gi r\u00e9seket az Element kliens biztons\u00e1gi auditja sor\u00e1n azonos\u00edtott\u00e1k. A probl\u00e9m\u00e1s \u00fcgyfelek sz\u00e1m\u00e1ra m\u00e1r kiadt\u00e1k a jav\u00edt\u00e1sokat. A felhaszn\u00e1l\u00f3knak s\u00fcrg\u0151sen telep\u00edteni\u00fck kell a friss\u00edt\u00e9seket, \u00e9s a friss\u00edt\u00e9s telep\u00edt\u00e9se el\u0151tt offline m\u00f3dba kell kapcsolniuk az \u00fcgyfeleket. A jav\u00edt\u00e1shoz val\u00f3 publik\u00e1l\u00e1s el\u0151tt nem \u00e1lltak rendelkez\u00e9sre a biztons\u00e1gi r\u00e9sek kihaszn\u00e1l\u00e1s\u00e1nak bizony\u00edt\u00e9kai. A kliens szabv\u00e1nyos napl\u00f3ja alapj\u00e1n a szerver<\/a> A t\u00e1mad\u00e1s t\u00e9ny\u00e9nek meg\u00e1llap\u00edt\u00e1sa lehetetlen, de mivel a t\u00e1mad\u00e1shoz a fi\u00f3k kompromitt\u00e1l\u00e1sa sz\u00fcks\u00e9ges, a rendszergazd\u00e1k elemezhetik a bejelentkez\u00e9si napl\u00f3kat a gyan\u00fas bejegyz\u00e9sek szempontj\u00e1b\u00f3l, m\u00edg a felhaszn\u00e1l\u00f3k ellen\u0151rizhetik a fi\u00f3kjukhoz kapcsolt eszk\u00f6z\u00f6k list\u00e1j\u00e1t a legut\u00f3bbi \u00fajrakapcsol\u00f3d\u00e1sok \u00e9s a bizalmi st\u00e1tuszv\u00e1ltoz\u00e1sok tekintet\u00e9ben. <\/p>\n

A kulcsmegoszt\u00e1s (key sharing) mechanizmusa, amelyben sebezhet\u0151s\u00e9geket tal\u00e1ltak, lehet\u0151v\u00e9 teszi a felhaszn\u00e1l\u00f3 sz\u00e1m\u00e1ra, aki nem rendelkezik a titkos\u00edt\u00e1shoz sz\u00fcks\u00e9ges kulcsokkal, hogy kulcsokat k\u00e9rjen a k\u00fcld\u0151 eszk\u00f6zt\u0151l vagy saj\u00e1t m\u00e1s eszk\u00f6zeikt\u0151l. P\u00e9ld\u00e1ul ez a lehet\u0151s\u00e9g sz\u00fcks\u00e9ges az el\u0151z\u0151 \u00fczenetek \u00faj eszk\u00f6z\u00f6n t\u00f6rt\u00e9n\u0151 dek\u00f3dol\u00e1s\u00e1hoz, vagy abban az esetben, ha a felhaszn\u00e1l\u00f3 elvesz\u00edti a birtok\u00e1ban l\u00e9v\u0151 kulcsokat. A protokoll specifik\u00e1ci\u00f3ja el\u0151\u00edrja, hogy alap\u00e9rtelmez\u00e9s szerint ne v\u00e1laszoljanak a kulcsk\u00e9r\u00e9sekre, \u00e9s azokat automatikusan csak a felhaszn\u00e1l\u00f3 azonos\u00edtott eszk\u00f6zeinek k\u00fcldj\u00e9k. Sajnos a gyakorlati megval\u00f3s\u00edt\u00e1sokban ezt a k\u00f6vetelm\u00e9nyt nem teljes\u00edtett\u00e9k, \u00e9s a kulcsok k\u00fcld\u00e9s\u00e9re vonatkoz\u00f3 k\u00e9r\u00e9seket megfelel\u0151 eszk\u00f6zazonos\u00edt\u00e1s n\u00e9lk\u00fcl kezelt\u00e9k.
\n
Forr\u00e1s: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\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 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\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\udd47A Matrix klienseiben felfedezett sebezhet\u0151s\u00e9gek, amelyek lehet\u0151v\u00e9 teszik a v\u00e9gpontok k\u00f6z\u00f6tti titkos\u00edt\u00e1si kulcsok felfed\u00e9s\u00e9t | ProHoster","description":"A decentraliz\u00e1lt kommunik\u00e1ci\u00f3s Matrix platform legt\u00f6bb kliensalkalmaz\u00e1s\u00e1ban sebezhet\u0151s\u00e9geket (CVE-2021-40823, CVE-2021-40824) fedeztek fel, amelyek lehet\u0151v\u00e9 teszik a 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\u0441\u043a\u0432\u043e\u0437\u043d\u043e\u0433\u043e \u0448\u0438\u0444\u0440\u043e\u0432\u0430\u043d\u0438\u044f | ProHoster","og:description":"\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, 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