{"id":115101,"date":"2024-04-16T14:30:16","date_gmt":"2024-04-16T12:30:16","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-putty-pozvolyayushhaya-vosstanovit-zakrytyj-klyuch-polzovatelya"},"modified":"2024-04-16T14:30:16","modified_gmt":"2024-04-16T12:30:16","slug":"uyazvimost-v-putty-pozvolyayushhaya-vosstanovit-zakrytyj-klyuch-polzovatelya","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/uyazvimost-v-putty-pozvolyayushhaya-vosstanovit-zakrytyj-klyuch-polzovatelya","title":{"rendered":"PuTTY haavatavus, mis v\u00f5imaldab taastada kasutaja privaatv\u00f5tme","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

PuTTY-s, Windowsi platvormal laialdaselt kasutatavas SSH-protokolli kliendis, leiti ohtlik haavatavus (CVE-2024-31497), mis v\u00f5imaldab taastada kasutaja privaatv\u00f5tit, mis on genereeritud NIST P-521 elliptilise k\u00f5veraga ECDSA algoritmi kasutades (ecdsa-sha2-nistp521). Privaatv\u00f5tme leidmiseks on piisav anal\u00fc\u00fcsida umbes 60 digiallkirja, mis on loodud probleemse v\u00f5tmega. <\/p>\n

Haavatavus ilmneb alates versioonist PuTTY 0.68 ning m\u00f5jutab ka tooteid, mis sisaldavad haavatavaid versioone PuTTY, n\u00e4iteks FileZilla (3.24.1 \u2014 3.66.5), WinSCP (5.9.5 \u2014 6.3.2), TortoiseGit (2.4.0.2 \u2014 2.15.0) ja TortoiseSVN (1.10.0 \u2014 1.14.6). Probleem on lahendatud PuTTY 0.81, FileZilla 3.67.0, WinSCP 6.3.3 ja TortoiseGit 2.15.0.1 v\u00e4rskendustes. P\u00e4rast uuenduse installimist soovitatakse kasutajatel genereerida uusi v\u00f5tmeid ja eemaldada vanad avalikud v\u00f5tmed failidest authorized_keys. <\/p>\n

Haavatavus tuleneb arendajate t\u00e4helepanuta j\u00e4tmisest, kellel oli 521-bitise v\u00f5tme genereerimiseks kasutatud initsialiseerimisvektorit (nonce), mis p\u00f5hines 512-bitisel juhuslikul j\u00e4rjestusel, arvates t\u00f5en\u00e4oliselt, et 512 bitist entropiat on piisavalt ja \u00fclej\u00e4\u00e4nud 9 bitti ei oma olulist t\u00e4htsust. Tulemuseks on see, et k\u00f5ik PuTTY-s loodud suletud v\u00f5tmed, kasutades algoritmi ecdsa-sha2-nistp521, olid esimesed 9 bitti initsialiseerimisvektoris alati nullid. <\/p>\n

ECDSA ja DSA puhul on valearvutusteta juhuslike arvude generaatori kvaliteet ning t\u00e4ielik juhuslike andmete katvus parameetrites, mida kasutatakse mooduli arvutamisel, \u00e4\u00e4rmiselt t\u00e4htsad, kuna isegi m\u00f5ne bitiga initsialiseerimisvektorist informatsiooni m\u00e4\u00e4ramine on piisav, et r\u00fcnnata j\u00e4rjestikku kogu suletud v\u00f5ti taastamiseks. Selleks, et edukalt taastada v\u00f5ti, piisab avaliku v\u00f5tme olemasolust ja probleemse v\u00f5tme kasutamisel genereeritud digiallkirjade anal\u00fc\u00fcsist, et r\u00fcndaja saaks teada andmeid. R\u00fcnnak piirdub HNP (Hidden Number Problem) \u00fclesande lahendamisega. <\/p>\n

Vajalikud digitaalsed allkirjad on saadaval n\u00e4iteks kasutaja \u00fchendamisel pahatahtliku SSH-serveriga v\u00f5i Git-serveriga, mis kasutab SSH-d transpordina. R\u00fcnnaku jaoks vajalikud allkirjad on samuti saadaval, kui v\u00f5tme kasutatakse mis tahes andmete, n\u00e4iteks Git-kohustuste, allkirjastamiseks, kui SSH-agent Pageant suunab liiklust arendaja hostile. R\u00fcndamine, saades vajalikke andmeid v\u00f5tme taastamiseks MITM-r\u00fcnnaku k\u00e4igus, on v\u00e4listatud, kuna SSH-s ei edastata allkirju avatud kujul. <\/p>\n

On m\u00e4rgitud, et sarnast mittet\u00e4ielike algusvektorite kasutamist on rakendatud PuTTY-s ja ka teiste elliptsete k\u00e4yrade puhul, kuid erinevate ECDSA P-521 algoritmide puhul ei piisa esinenud teabe leketest t\u00f6\u00f6v\u00f5imeka v\u00f5tme taastamisr\u00fcnnaku teostamiseks. Teiste suurustega ECDSA v\u00f5tmed ja Ed25519 v\u00f5tmed ei ole r\u00fcnnaku suhtes haavatavad.
\n
Allikas: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 PuTTY, \u043a\u043b\u0438\u0435\u043d\u0442\u0435 \u0434\u043b\u044f \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 SSH, \u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0449\u0435\u0433\u043e\u0441\u044f \u043f\u043e\u043f\u0443\u043b\u044f\u0440\u043d\u043e\u0441\u0442\u044c\u044e \u043d\u0430 \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u0435 Windows, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u043e\u043f\u0430\u0441\u043d\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2024-31497), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0432\u043e\u0441\u0441\u043e\u0437\u0434\u0430\u0442\u044c \u0437\u0430\u043a\u0440\u044b\u0442\u044b\u0439 \u043a\u043b\u044e\u0447 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f, \u0441\u0433\u0435\u043d\u0435\u0440\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0439 \u0441 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435\u043c \u0430\u043b\u0433\u043e\u0440\u0438\u0442\u043c\u0430 ECDSA \u0441 \u044d\u043b\u043b\u0438\u043f\u0442\u0438\u0447\u0435\u0441\u043a\u043e\u0439 \u043a\u0440\u0438\u0432\u043e\u0439 NIST P-521 (ecdsa-sha2-nistp521). \u0414\u043b\u044f \u043f\u043e\u0434\u0431\u043e\u0440\u0430 \u0437\u0430\u043a\u0440\u044b\u0442\u043e\u0433\u043e \u043a\u043b\u044e\u0447\u0430 \u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u043e \u043f\u0440\u043e\u0430\u043d\u0430\u043b\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u043f\u0440\u0438\u043c\u0435\u0440\u043d\u043e 60 \u0446\u0438\u0444\u0440\u043e\u0432\u044b\u0445 \u043f\u043e\u0434\u043f\u0438\u0441\u0435\u0439, \u0441\u0444\u043e\u0440\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u043d\u044b\u043c \u043a\u043b\u044e\u0447\u043e\u043c. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 \u0432\u0435\u0440\u0441\u0438\u0438 PuTTY 0.68 \u0438 \u0442\u0430\u043a\u0436\u0435 \u0437\u0430\u0442\u0440\u043e\u043d\u0443\u043b\u0430 \u043f\u0440\u043e\u0434\u0443\u043a\u0442\u044b, […]<\/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-115101","post","type-post","status-publish","format-standard","hentry","category-novosti-interneta"],"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\udd47Haavatavus PuTTY-s, mis v\u00f5imaldab taastada kasutaja privaatv\u00f5tme | ProHoster","description":"PuTTY-s, Windowsi platvormil populaarses SSH-protokolli kliendis, avastati ohtlik haavatavus (CVE-2024-31497), mis v\u00f5imaldab taastada kasutaja privaatv\u00f5tme, mille on genereerinud NIST P-521 elliptilise k\u00f5vera ECDSA algoritm (ecdsa-sha2-nistp521). Privaatv\u00f5tme leidmiseks on piisav anal\u00fc\u00fcsida umbes 60 digitaalset allkirja, mis on loodud probleemse v\u00f5tme abil. Haavatavus ilmneb alates versioonist PuTTY 0.68 ja m\u00f5jutab ka tooteid.","canonical_url":"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/uyazvimost-v-putty-pozvolyayushhaya-vosstanovit-zakrytyj-klyuch-polzovatelya","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"et_EE","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 \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 PuTTY, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0432\u043e\u0441\u0441\u0442\u0430\u043d\u043e\u0432\u0438\u0442\u044c \u0437\u0430\u043a\u0440\u044b\u0442\u044b\u0439 \u043a\u043b\u044e\u0447 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f | ProHoster","og:description":"\u0412 PuTTY, \u043a\u043b\u0438\u0435\u043d\u0442\u0435 \u0434\u043b\u044f \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 SSH, \u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0449\u0435\u0433\u043e\u0441\u044f \u043f\u043e\u043f\u0443\u043b\u044f\u0440\u043d\u043e\u0441\u0442\u044c\u044e \u043d\u0430 \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u0435 Windows, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u043e\u043f\u0430\u0441\u043d\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2024-31497), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0432\u043e\u0441\u0441\u043e\u0437\u0434\u0430\u0442\u044c \u0437\u0430\u043a\u0440\u044b\u0442\u044b\u0439 \u043a\u043b\u044e\u0447 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f, \u0441\u0433\u0435\u043d\u0435\u0440\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0439 \u0441 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435\u043c \u0430\u043b\u0433\u043e\u0440\u0438\u0442\u043c\u0430 ECDSA \u0441 \u044d\u043b\u043b\u0438\u043f\u0442\u0438\u0447\u0435\u0441\u043a\u043e\u0439 \u043a\u0440\u0438\u0432\u043e\u0439 NIST P-521 (ecdsa-sha2-nistp521). \u0414\u043b\u044f \u043f\u043e\u0434\u0431\u043e\u0440\u0430 \u0437\u0430\u043a\u0440\u044b\u0442\u043e\u0433\u043e \u043a\u043b\u044e\u0447\u0430 \u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u043e \u043f\u0440\u043e\u0430\u043d\u0430\u043b\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u043f\u0440\u0438\u043c\u0435\u0440\u043d\u043e 60 \u0446\u0438\u0444\u0440\u043e\u0432\u044b\u0445 \u043f\u043e\u0434\u043f\u0438\u0441\u0435\u0439, \u0441\u0444\u043e\u0440\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u043d\u044b\u043c \u043a\u043b\u044e\u0447\u043e\u043c. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 \u0432\u0435\u0440\u0441\u0438\u0438 PuTTY 0.68 \u0438 \u0442\u0430\u043a\u0436\u0435 \u0437\u0430\u0442\u0440\u043e\u043d\u0443\u043b\u0430 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