{"id":105214,"date":"2022-09-29T15:36:37","date_gmt":"2022-09-29T13:36:37","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/kriticheskie-uyazvimosti-komprometiruyushhie-skvoznoe-shifrovanie-vo-mnogih-matrix-klientah"},"modified":"2022-09-29T15:36:37","modified_gmt":"2022-09-29T13:36:37","slug":"kriticheskie-uyazvimosti-komprometiruyushhie-skvoznoe-shifrovanie-vo-mnogih-matrix-klientah","status":"publish","type":"post","link":"https:\/\/prohoster.info\/en\/blog\/news\/kriticheskie-uyazvimosti-komprometiruyushhie-skvoznoe-shifrovanie-vo-mnogih-matrix-klientah","title":{"rendered":"Critical vulnerabilities compromising end-to-end encryption in many Matrix clients.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>The developers of the decentralized communication platform Matrix have warned of critical vulnerabilities discovered in the libraries matrix-js-sdk, matrix-ios-sdk, and matrix-android-sdk2, which allow server administrators to impersonate other users and read messages in end-to-end encrypted (E2EE) chats. These vulnerabilities are caused by errors in specific implementations of the Matrix protocol and are not issues with the protocol itself. Updates for the problematic SDKs and some client applications built on them have been released by the project.    <\/p>\n<p>To successfully carry out an attack, an attacker must access a controlled home server <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/en\/server\/dts-shicago\/\"   title=\"server\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2922\">server<\/a> (homeserver \u2014 a server for storing client history and accounts). The use of end-to-end encryption on the client side prevents the administrator from <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/en\/server\/dts-los-angeles\/\"   title=\"server\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3857\">server<\/a> intercept message exchanges, but the identified vulnerabilities enable bypassing this protection. The issues affect the primary Matrix client Element (formerly Riot) for Web, desktop systems, iOS, and Android, as well as third-party client applications including Cinny, Beeper, SchildiChat, Circuli, and Synod.im. Vulnerabilities do not manifest in the libraries matrix-rust-sdk, hydrogen-sdk, Matrix Dart SDK, mautrix-python, mautrix-go, and matrix-nio, or in the applications Hydrogen, ElementX, Nheko, FluffyChat, Syphon, Timmy, Gomuks, and Pantalaimon.      <\/p>\n<p>Three main attack scenarios are outlined:  <\/p>\n<ul>\n<li class=\"l\"> A Matrix server administrator can disrupt the emoji-based verification (SAS, Short Authentication Strings) when using cross-signatures and impersonate another user. This issue is caused by a vulnerability (CVE-2022-39250) in the matrix-js-sdk code, related to the mixing of handling device identifiers and cross-signing keys.\n<li class=\"l\"> A controlling server operator can forge a trusted sender and pass a fake key to intercept messages from other users. This issue stems from vulnerabilities in matrix-js-sdk (CVE-2022-39251), matrix-ios-sdk (CVE-2022-39255), and matrix-android-sdk2 (CVE-2022-39248), which caused the client to incorrectly accept device-addressed messages encrypted using the Megolm protocol instead of Olm, attributing the messages to the Megolm sender rather than the actual sender.\n<li class=\"l\"> By exploiting the vulnerabilities mentioned in the previous point, the server administrator can also add a dummy backup key to a user account to retrieve the keys used for message encryption.    <\/ul>\n<p>The researchers who discovered the vulnerability also demonstrated attacks that could lead to the addition of an external user to the chat or the attachment of someone else's device to a user. These attacks are based on the fact that control messages used to add users to the chat are not tied to the keys of the chat creator and can be generated by the server administrator. Developers from the Matrix project classified these vulnerabilities as minor, since such manipulations would not go unnoticed \u2014 if a user is substituted, they will appear in the chat user list, and when a device is added, a warning will be displayed, marking the device as unverified (at the same time, shared keys necessary for decrypting messages will immediately begin to be transmitted to the substituted device).<br \/>\n<br \/>Source: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=57844\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 \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 \u043f\u0440\u0435\u0434\u0443\u043f\u0440\u0435\u0434\u0438\u043b\u0438 \u043e \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0438\u0438 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0445 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 \u0432 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430\u0445 matrix-js-sdk, matrix-ios-sdk \u0438 matrix-android-sdk2, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0445 \u0430\u0434\u043c\u0438\u043d\u0438\u0441\u0442\u0440\u0430\u0442\u043e\u0440\u0430\u043c \u0441\u0435\u0440\u0432\u0435\u0440\u043e\u0432 \u0432\u044b\u0434\u0430\u0432\u0430\u0442\u044c \u0441\u0435\u0431\u044f \u0437\u0430 \u0434\u0440\u0443\u0433\u0438\u0445 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u0438 \u0447\u0438\u0442\u0430\u0442\u044c \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u044f \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). \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432\u044b\u0437\u0432\u0430\u043d\u044b \u043e\u0448\u0438\u0431\u043a\u0430\u043c\u0438 \u0432 \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u044b\u0445 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f\u0445 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 Matrix \u0438 \u043d\u0435 \u044f\u0432\u043b\u044f\u044e\u0442\u0441\u044f \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430\u043c\u0438 \u0441\u0430\u043c\u043e\u0433\u043e \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430. \u0412 \u043d\u0430\u0441\u0442\u043e\u044f\u0449\u0435\u0435 \u0432\u0440\u0435\u043c\u044f, \u043f\u0440\u043e\u0435\u043a\u0442\u043e\u043c \u0432\u044b\u043f\u0443\u0449\u0435\u043d\u044b \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u043d\u044b\u0445 SDK [&hellip;]<\/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-105214","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.2 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 \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 \u043f\u0440\u0435\u0434\u0443\u043f\u0440\u0435\u0434\u0438\u043b\u0438 \u043e 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end-to-end encryption in many Matrix clients | ProHoster","description":"Developers of the decentralized communications platform Matrix have alerted to the discovery of critical vulnerabilities in the matrix-js-sdk, matrix-ios-sdk, and matrix-android-sdk2 libraries, allowing server administrators to exploit them.","canonical_url":"https:\/\/prohoster.info\/en\/blog\/news\/kriticheskie-uyazvimosti-komprometiruyushhie-skvoznoe-shifrovanie-vo-mnogih-matrix-klientah","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"en_US","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS 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