{"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\/ro\/blog\/news\/uyazvimosti-v-klientah-matrix-pozvolyayushhie-raskryt-klyuchi-skvoznogo-shifrovaniya","title":{"rendered":"Vulnerabilit\u0103\u021bi \u00een clien\u021bii Matrix, care permit dezv\u0103luirea cheilor de criptare end-to-end.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

\u00cen majoritatea aplica\u021biilor client pentru platforma de comunica\u021bii descentralizate Matrix, au fost descoperite vulnerabilit\u0103\u021bi (CVE-2021-40823, CVE-2021-40824) care permit ob\u021binerea informa\u021biilor despre cheile utilizate pentru transmiterea mesajelor \u00een chat-urile cu criptare end-to-end (E2EE). Atacatorul, compromi\u021b\u00e2nd unul dintre utilizatorii chat-ului, poate decripta mesajele trimise anterior acestui utilizator din aplica\u021biile client vulnerabile. <\/p>\n

Pentru exploatarea cu succes, este necesar accesul la contul destinatarului mesajelor. Accesul poate fi ob\u021binut fie prin scurgerea parametrilor contului, fie prin compromiterea serverului Matrix prin care se conecteaz\u0103 utilizatorul. Vulnerabilit\u0103\u021bile reprezint\u0103 cel mai mare pericol pentru utilizatorii camerelor de chat criptate, la care sunt conectate servere Matrix controlate de atacatori. Administratorii acestora servere<\/a> pot \u00eencerca s\u0103 se deghizeze \u00een utilizatori ai serverului pentru a intercepta mesajele trimise \u00een chat din aplica\u021biile client vulnerabile. <\/p>\n

Vulnerabilit\u0103\u021bile sunt cauzate de erori logice \u00een implement\u0103rile mecanismului de revocare a accesului la chei, propuse \u00een 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 \u0219i Nheko \u2264 0.8.2. Implement\u0103rile bazate pe bibliotecile matrix-ios-sdk, matrix-nio \u0219i libolm nu sunt vulnerabile. <\/p>\n

Prin urmare, vulnerabilit\u0103\u021bile se manifest\u0103 \u00een toate aplica\u021biile care au \u00eemprumutat codul problematic \u0219i nu afecteaz\u0103 direct protocoalele Matrix \u0219i Olm\/Megolm. \u00cen special, problema afecteaz\u0103 clientul principal Matrix Element (fost Riot) pentru Web, sisteme desktop \u0219i Android, precum \u0219i aplica\u021biile \u0219i bibliotecile clientelor de ter\u021b\u0103 parte, inclusiv FluffyChat, Nheko, Cinny \u0219i SchildiChat. Problema nu se manifest\u0103 \u00een clientul oficial pentru platforma iOS, precum \u0219i \u00een aplica\u021biile Chatty, Hydrogen, mautrix, purple-matrix \u0219i Syphon. <\/p>\n

Vulnerabilit\u0103\u021bile au fost identificate \u00een timpul auditului de securitate al clientului Element. Corec\u021biile au fost deja emise pentru toate clien\u021bii problematice. Utilizatorilor li se recomand\u0103 s\u0103 instaleze de urgen\u021b\u0103 actualiz\u0103rile, iar p\u00e2n\u0103 la instalarea actualiz\u0103rii, s\u0103 mute clien\u021bii \u00een modul offline. Dovezile exploat\u0103rii vulnerabilit\u0103\u021bii sunt absente p\u00e2n\u0103 la publicarea corec\u021biei. \u00cen conformitate cu jurnalele de func\u021bionare ale clientului \u0219i server<\/a> Este imposibil de determinat dac\u0103 a avut loc un atac, dar fiindc\u0103 atacul necesit\u0103 compromiterea contului, administratorii pot analiza existen\u021ba acces\u0103rilor suspecte \u00een logurile de autentificare de pe serverele lor, iar utilizatorii pot verifica lista dispozitivelor asociate contului lor pentru reconect\u0103ri recente \u0219i schimb\u0103ri de statut de \u00eencredere. <\/p>\n

Mecanismul de acces repetat la chei (key sharing), \u00een cadrul c\u0103ruia au fost g\u0103site vulnerabilit\u0103\u021bi, permite clientului, care nu are cheile necesare pentru decriptarea mesajului, s\u0103 solicite cheile de la dispozitivul expeditor sau de la alte dispozitive ale sale. De exemplu, aceast\u0103 capacitate este necesar\u0103 pentru a asigura decriptarea mesajelor vechi pe un dispozitiv nou al utilizatorului sau \u00een cazul \u00een care utilizatorul \u0219i-a pierdut cheile existente. Specifica\u021bia protocolului prevede ca, implicit, s\u0103 nu r\u0103spund\u0103 la cererile de chei \u0219i s\u0103 le trimit\u0103 automat doar c\u0103tre dispozitivele verificate ale aceluia\u0219i utilizator. Din p\u0103cate, \u00een implement\u0103rile practice, aceast\u0103 cerin\u021b\u0103 nu a fost respectat\u0103, iar cererile de trimitere a cheilor au fost procesate f\u0103r\u0103 o identificare adecvat\u0103 a dispozitivului.
\n
Sursa: opennet.ro<\/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\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\udd47Vulnerabilit\u0103\u021bi \u00een clien\u021bii Matrix care permit divulgarea cheilor de criptare end-to-end | ProHoster","description":"\u00cen majoritatea aplica\u021biilor client pentru platforma de comunica\u021bii descentralizate Matrix au fost identificate vulnerabilit\u0103\u021bi (CVE-2021-40823, CVE-2021-40824) care permit ob\u021binerea informa\u021biilor despre cheile utilizate pentru 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