{"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\/da\/blog\/news\/uyazvimosti-v-klientah-matrix-pozvolyayushhie-raskryt-klyuchi-skvoznogo-shifrovaniya","title":{"rendered":"S\u00e5rbarheder i Matrix-klienter, der muligg\u00f8r afsl\u00f8ring af n\u00f8gle til ende-til-ende kryptering.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

I de fleste klientapplikationer til den decentraliserede kommunikationsplatform Matrix er der identificeret s\u00e5rbarheder (CVE-2021-40823, CVE-2021-40824), der g\u00f8r det muligt at f\u00e5 oplysninger om de n\u00f8gler, der blev brugt til at sende beskeder i chats med ende-til-ende-kryptering (E2EE). En angriber, der har kompromitteret en af chatbrugerne, kan afkode beskeder, der tidligere er sendt til denne bruger fra de s\u00e5rbare klientapplikationer. <\/p>\n

For en succesfuld udnyttelse er der behov for adgang til modtagerens konto. Adgang kan opn\u00e5s enten gennem l\u00e6kage af kontooplysninger eller ved at hacke Matrix-serveren, som brugeren tilslutter sig. Den st\u00f8rste fare ved s\u00e5rbarhederne udg\u00f8r de brugere af krypterede chatrum, der er tilsluttet Matrix-servere, der kontrolleres af ondsindede akt\u00f8rer. Administratorer af s\u00e5danne servere<\/a> kan fors\u00f8ge at udgive sig for at v\u00e6re serverbrugere for at opsnappe beskeder sendt i chat mellem de s\u00e5rbare klientapplikationer. <\/p>\n

S\u00e5rbarhederne skyldes logiske fejl i implementeringen af mekanismerne til at genoprette adgang til n\u00f8gler, som er foresl\u00e5et i 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 og Nheko \u2264 0.8.2. Implementeringer baseret p\u00e5 bibliotekerne matrix-ios-sdk, matrix-nio og libolm er ikke s\u00e5rbare. <\/p>\n

I overensstemmelse hermed manifesterer s\u00e5rbarhederne sig i alle applikationer, der har l\u00e5nt den problematiske kode, og vedr\u00f8rer ikke direkte protokollerne Matrix og Olm\/Megolm. Specifikt ber\u00f8rer problemet den prim\u00e6re Matrix-klient Element (tidligere Riot) til web, desktop og Android, samt tredjeparts klientapplikationer og biblioteker, herunder FluffyChat, Nheko, Cinny og SchildiChat. Problemet viser sig ikke i den officielle klient til iOS-platformen samt i applikationerne Chatty, Hydrogen, mautrix, purple-matrix og Syphon. <\/p>\n

S\u00e5rbarhederne blev opdaget under en sikkerhedsrevision af klienten Element. Rettelser er allerede blevet udgivet for alle problematiske klienter. Brugerne anbefales kraftigt at opdatere, og indtil opdateringen er installeret, skal klienterne s\u00e6ttes i offline tilstand. Der er ingen beviser for udnyttelse af s\u00e5rbarheden inden offentligg\u00f8relsen af rettelsen. If\u00f8lge de almindelige logfiler fra klienten og server<\/a> Det er umuligt at fastsl\u00e5 angrebet, men da kompromittering af kontoen er n\u00f8dvendig for angrebet, kan administratorer analysere loggene for autentificering p\u00e5 deres servere for at tjekke for mist\u00e6nkelige login-fors\u00f8g, mens brugerne kan vurdere listen over enheder, der er knyttet til deres konto, for nylige genforbindelser og \u00e6ndringer i tillidsstatus. <\/p>\n

N\u00f8gle-delings mekanismen (key sharing), hvori der er fundet s\u00e5rbarheder, tillader en klient uden n\u00f8gler til at dekryptere meddelelsen at anmode om n\u00f8gler fra den afsendende enhed eller andre af sine enheder. For eksempel er en s\u00e5dan funktion n\u00f8dvendig for at muligg\u00f8re dekryptering af gamle meddelelser p\u00e5 en ny enhed for brugeren, eller i tilf\u00e6lde af at brugeren har mistet sine n\u00f8gler. Protokol-specifikationen foreskriver, at anmodninger om n\u00f8gler som standard ikke besvares, og at de automatisk kun sendes til verificerede enheder af samme bruger. Desv\u00e6rre er dette krav ikke blevet opfyldt i praktiske implementeringer, og anmodninger om at sende n\u00f8gler behandles uden tilstr\u00e6kkelig enhedsidentifikation.
\n
Kilde: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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[…]<\/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\udd47S\u00e5rbarheder i Matrix-klienter, der muligg\u00f8r afsl\u00f8ring af n\u00f8gler til ende-til-ende kryptering | ProHoster","description":"I de fleste klientapplikationer til den decentraliserede kommunikationsplatform Matrix er der fundet s\u00e5rbarheder (CVE-2021-40823, CVE-2021-40824), der muligg\u00f8r adgang til oplysninger om de n\u00f8gler, der er brugt til 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