{"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\/hu\/blog\/news\/uyazvimost-v-putty-pozvolyayushhaya-vosstanovit-zakrytyj-klyuch-polzovatelya","title":{"rendered":"Sebezhet\u0151s\u00e9g a PuTTY-ban, amely lehet\u0151v\u00e9 teszi a felhaszn\u00e1l\u00f3 z\u00e1rt kulcs\u00e1nak vissza\u00e1ll\u00edt\u00e1s\u00e1t","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A PuTTY, az SSH protokollhoz k\u00e9sz\u00fclt n\u00e9pszer\u0171 kliens a Windows platformon, egy vesz\u00e9lyes sebezhet\u0151s\u00e9get (CVE-2024-31497) t\u00e1rt fel, amely lehet\u0151v\u00e9 teszi a felhaszn\u00e1l\u00f3 titkos kulcs\u00e1nak \u00fajragener\u00e1l\u00e1s\u00e1t, amelyet az NIST P-521 elliptikus g\u00f6rbe ECDSA algoritmus\u00e1val hoztak l\u00e9tre (ecdsa-sha2-nistp521). A titkos kulcs kital\u00e1l\u00e1s\u00e1hoz k\u00f6r\u00fclbel\u00fcl 60 digit\u00e1lis al\u00e1\u00edr\u00e1s elemez\u00e9se elegend\u0151, amelyeket a probl\u00e9m\u00e1s kulcs gener\u00e1lt. <\/p>\n

A sebezhet\u0151s\u00e9g a PuTTY 0.68-as verzi\u00f3j\u00e1t\u00f3l kezd\u0151d\u0151en jelentkezik, \u00e9s olyan term\u00e9keket is \u00e9rint, amelyek sebezhet\u0151 PuTTY verzi\u00f3kat tartalmaznak, p\u00e9ld\u00e1ul a FileZilla (3.24.1 - 3.66.5), WinSCP (5.9.5 - 6.3.2), TortoiseGit (2.4.0.2 - 2.15.0) \u00e9s TortoiseSVN (1.10.0 - 1.14.6) verzi\u00f3it. A probl\u00e9ma a PuTTY 0.81, FileZilla 3.67.0, WinSCP 6.3.3 \u00e9s TortoiseGit 2.15.0.1 friss\u00edt\u00e9seiben ker\u00fclt jav\u00edt\u00e1sra. A friss\u00edt\u00e9s telep\u00edt\u00e9se ut\u00e1n javasolt \u00faj kulcsokat gener\u00e1lni \u00e9s t\u00f6r\u00f6lni a r\u00e9gi nyilv\u00e1nos kulcsokat az authorized_keys f\u00e1jlokb\u00f3l. <\/p>\n

A sebezhet\u0151s\u00e9get a fejleszt\u0151k gondatlans\u00e1ga okozta, akik a 521-bites kulcs gener\u00e1l\u00e1s\u00e1hoz egy 512-bites v\u00e9letlenszer\u0171 sorozaton alapul\u00f3 inicializ\u00e1l\u00f3 vektort (nonce) haszn\u00e1ltak, val\u00f3sz\u00edn\u0171leg azt gondolt\u00e1k, hogy az 512 bit elegend\u0151 lesz, \u00e9s a fennmarad\u00f3 9 bit nem jelent\u0151s. Ennek eredm\u00e9nyek\u00e9nt az \u00f6sszes PuTTY-ban ECDSA algoritmus haszn\u00e1lat\u00e1val k\u00e9sz\u00fclt titkos kulcs els\u0151 9 bitjei mindig null\u00e1s \u00e9rt\u00e9ket vettek fel. <\/p>\n

Az ECDSA \u00e9s DSA eset\u00e9ben a pszeudo-v\u00e9letlen sz\u00e1mok gener\u00e1tor\u00e1nak min\u0151s\u00e9ge \u00e9s a haszn\u00e1lt param\u00e9ter teljes v\u00e9letlenszer\u0171s\u00e9ggel val\u00f3 lefedetts\u00e9ge alapvet\u0151 fontoss\u00e1g\u00fa, mivel m\u00e9g n\u00e9h\u00e1ny bit inform\u00e1ci\u00f3 a inicializ\u00e1l\u00f3 vektorr\u00f3l elegend\u0151 ahhoz, hogy t\u00e1mad\u00e1st v\u00e9gezzenek a titkos kulcs szekvenci\u00e1lis helyre\u00e1ll\u00edt\u00e1sa \u00e9rdek\u00e9ben. A kulcs sikeres helyre\u00e1ll\u00edt\u00e1s\u00e1hoz elegend\u0151 a nyilv\u00e1nos kulcs megl\u00e9te \u00e9s t\u00f6bb tucat digit\u00e1lis al\u00e1\u00edr\u00e1s elemz\u00e9se, amelyeket a probl\u00e9m\u00e1s kulcs gener\u00e1lt a t\u00e1mad\u00f3 sz\u00e1m\u00e1ra ismert adatokkal. A t\u00e1mad\u00e1s a HNP (Rejtett Sz\u00e1m Probl\u00e9ma) megold\u00e1s\u00e1ra korl\u00e1toz\u00f3dik. <\/p>\n

A sz\u00fcks\u00e9ges digit\u00e1lis al\u00e1\u00edr\u00e1sok p\u00e9ld\u00e1ul akkor nyerhet\u0151k meg, amikor a felhaszn\u00e1l\u00f3 az t\u00e1mad\u00f3 SSH-szerver\u00e9hez vagy egy Git-szerverhez csatlakozik, amely az SSH-t haszn\u00e1lja mint hordoz\u00f3t. A t\u00e1mad\u00e1shoz sz\u00fcks\u00e9ges al\u00e1\u00edr\u00e1sokat szint\u00e9n meg lehet szerezni, ha a kulcsot v\u00e9letlenszer\u0171 adatok, p\u00e9ld\u00e1ul git-commitekr\u00f3l val\u00f3 al\u00e1\u00edr\u00e1sokhoz haszn\u00e1lt\u00e1k, amikor az SSH-\u00fcgyn\u00f6k, a Pageant, forgalmat ir\u00e1ny\u00edt a fejleszt\u0151i hosztra. Az MITM-t\u00e1mad\u00e1s sor\u00e1n a sz\u00fcks\u00e9ges adatok megszerz\u00e9se a kulcs helyre\u00e1ll\u00edt\u00e1s\u00e1hoz kiz\u00e1rt, mivel az SSH al\u00e1\u00edr\u00e1sokat nem tov\u00e1bb\u00edtj\u00e1k ny\u00edlt form\u00e1ban. <\/p>\n

Megjegyzend\u0151, hogy hasonl\u00f3 m\u00f3don haszn\u00e1lt teljes\u00edtetlen inicializ\u00e1l\u00f3 vektorokat alkalmaztak a PuTTY-ban \u00e9s m\u00e1s elliptikus g\u00f6rb\u00e9k eset\u00e9ben is, de a nem ECDSA P-521 algoritmusokkal kapcsolatos adatainform\u00e1ci\u00f3k sziv\u00e1rg\u00e1sa nem elegend\u0151 a m\u0171k\u00f6d\u0151 kulcshelyre\u00e1ll\u00edt\u00f3 t\u00e1mad\u00e1s v\u00e9grehajt\u00e1s\u00e1hoz. Az m\u00e1s m\u00e9ret\u0171 ECDSA kulcsok \u00e9s az Ed25519 kulcsok nem ki vannak t\u00e9ve t\u00e1mad\u00e1snak.
\n
Forr\u00e1s: 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-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\udd47Sebezhet\u0151s\u00e9g a PuTTY-ban, amely lehet\u0151v\u00e9 teszi a felhaszn\u00e1l\u00f3 z\u00e1rt kulcs\u00e1nak helyre\u00e1ll\u00edt\u00e1s\u00e1t | ProHoster","description":"A PuTTY-ban, amely egy n\u00e9pszer\u0171 SSH protokoll kliens Windows platformon, s\u00falyos sebezhet\u0151s\u00e9get (CVE-2024-31497) fedeztek fel, amely lehet\u0151v\u00e9 teszi a felhaszn\u00e1l\u00f3 \u00e1ltal gener\u00e1lt z\u00e1rt kulcs \u00fajb\u00f3li l\u00e9trehoz\u00e1s\u00e1t.","canonical_url":"https:\/\/prohoster.info\/hu\/blog\/news\/uyazvimost-v-putty-pozvolyayushhaya-vosstanovit-zakrytyj-klyuch-polzovatelya","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"hu_HU","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 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\u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435\u043c.","og:url":"https:\/\/prohoster.info\/hu\/blog\/news\/uyazvimost-v-putty-pozvolyayushhaya-vosstanovit-zakrytyj-klyuch-polzovatelya","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2024-04-16T12:30:16+00:00","article:modified_time":"2024-04-16T12:30:16+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":{"post_id":"115101","title":null,"description":null,"keywords":null,"keyphrases":null,"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"default","og_image_url":null,"og_image_width":null,"og_image_height":null,"og_image_custom_url":null,"og_image_custom_fields":null,"og_video":null,"og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":false,"twitter_card":"default","twitter_image_type":"default","twitter_image_url":null,"twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_title":null,"twitter_description":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"","isEnabled":true},"graphs":[]},"schema_type":"default","schema_type_options":null,"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":null,"robots_max_videopreview":null,"robots_max_imagepreview":"large","priority":null,"frequency":null,"local_seo":null,"seo_analyzer_scan_date":"2026-01-22 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