{"id":102629,"date":"2021-12-16T03:36:46","date_gmt":"2021-12-16T01:36:46","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/perepolnenie-bufera-v-toxcore-ekspluatiruemoe-cherez-otpravku-udp-paketa"},"modified":"2021-12-16T03:36:46","modified_gmt":"2021-12-16T01:36:46","slug":"perepolnenie-bufera-v-toxcore-ekspluatiruemoe-cherez-otpravku-udp-paketa","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/perepolnenie-bufera-v-toxcore-ekspluatiruemoe-cherez-otpravku-udp-paketa","title":{"rendered":"B\u00fcf\u00e9r\u00f3lat\u00e1s a Toxcore-ban, amely UDP-csomag k\u00fcld\u00e9s\u00e9vel kihaszn\u00e1lhat\u00f3.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A Toxcore, a referencia P2P \u00fczenetk\u00fcld\u0151 protokoll implement\u00e1ci\u00f3j\u00e1ban felfedeztek egy sebezhet\u0151s\u00e9get (CVE-2021-44847), amely potenci\u00e1lisan lehet\u0151v\u00e9 teszi k\u00f3dv\u00e9grehajt\u00e1s kezdem\u00e9nyez\u00e9s\u00e9t, amikor egy speci\u00e1lisan form\u00e1zott UDP csomagot dolgoznak fel. A sebezhet\u0151s\u00e9gnek minden Toxcore alap\u00fa alkalmaz\u00e1s felhaszn\u00e1l\u00f3ja ki van t\u00e9ve, ahol az UDP sz\u00e1ll\u00edt\u00e1s nincs letiltva. A t\u00e1mad\u00e1shoz elegend\u0151 egy UDP csomagot k\u00fcldeni, ha ismert az \u00e1ldozat IP-c\u00edm, a h\u00e1l\u00f3zati port \u00e9s a nyitott DHT-kulcs (ezek az adatok nyilv\u00e1nosan el\u00e9rhet\u0151k a DHT-n, teh\u00e1t a t\u00e1mad\u00e1s b\u00e1rmely felhaszn\u00e1l\u00f3 vagy DHT csom\u00f3pont ellen v\u00e9grehajthat\u00f3). <\/p>\n

A probl\u00e9ma a toxcore 0.1.9 \u00e9s 0.2.12 k\u00f6z\u00f6tti verzi\u00f3iban jelentkezett, \u00e9s a 0.2.13-as verzi\u00f3ban orvosolt\u00e1k. Az \u00fcgyf\u00e9lalkalmaz\u00e1sok k\u00f6z\u00fcl a sebezhet\u0151s\u00e9g jav\u00edt\u00e1s\u00e1val eddig csak a qTox projekt adott ki friss\u00edt\u00e9st. Az UDP haszn\u00e1lat\u00e1nak letilt\u00e1sa, a TCP t\u00e1mogat\u00e1s\u00e1nak fenntart\u00e1sa alternat\u00edv v\u00e9delmi megold\u00e1s lehet. <\/p>\n

A s\u00e9r\u00fcl\u00e9kenys\u00e9get a handle_request() f\u00fcggv\u00e9nyben fell\u00e9p\u0151 verem t\u00falcsordul\u00e1s okozza, amely a h\u00e1l\u00f3zati csomagok adatainak m\u00e9ret\u00e9nek helytelen kisz\u00e1m\u00edt\u00e1s\u00e1b\u00f3l ered. K\u00fcl\u00f6n\u00f6sen, a titkos\u00edtott adatok hossza a CRYPTO_SIZE makr\u00f3 defini\u00e1l\u00e1s\u00e1val lett meghat\u00e1rozva, amely «1 + CRYPTO_PUBLIC_KEY_SIZE * 2 + CRYPTO_NONCE_SIZE» \u00e9rt\u00e9ket kapott, ezt k\u00f6vet\u0151en a «length — CRYPTO_SIZE» m\u0171veletben haszn\u00e1lt\u00e1k fel. A makr\u00f3ban l\u00e9v\u0151 z\u00e1r\u00f3jelek hi\u00e1nya miatt nem \u00f6sszeget, hanem 1-et vontak le, mik\u00f6zben a t\u00f6bbi r\u00e9szt hozz\u00e1adt\u00e1k. P\u00e9ld\u00e1ul a «length — (1 + 32 * 2 + 24)» helyett a puffer m\u00e9rete «length — 1 + 32 * 2 + 24» form\u00e1ban lett kisz\u00e1m\u00edtva, ami a puffer hat\u00e1rain k\u00edv\u00fcl elhelyezked\u0151 adatok fel\u00fcl\u00edr\u00e1s\u00e1hoz vezetett a veremben.
\n
Forr\u00e1s: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 Toxcore, \u044d\u0442\u0430\u043b\u043e\u043d\u043d\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 P2P-\u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 \u043e\u0431\u043c\u0435\u043d\u0430 \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u044f\u043c\u0438 Tox, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2021-44847), \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0438\u043d\u0438\u0446\u0438\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u043a\u043e\u0434\u0430 \u043f\u0440\u0438 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0435 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u043e\u0433\u043e UDP-\u043f\u0430\u043a\u0435\u0442\u0430. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043f\u043e\u0434\u0432\u0435\u0440\u0436\u0435\u043d\u044b \u0432\u0441\u0435 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0439 \u043d\u0430 \u0431\u0430\u0437\u0435 Toxcore, \u0432 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u043d\u0435 \u043e\u0442\u043a\u043b\u044e\u0447\u0451\u043d \u0442\u0440\u0430\u043d\u0441\u043f\u043e\u0440\u0442 UDP. \u0414\u043b\u044f \u0430\u0442\u0430\u043a\u0438 \u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u043e \u043e\u0442\u043f\u0440\u0430\u0432\u0438\u0442\u044c UDP-\u043f\u0430\u043a\u0435\u0442, \u0437\u043d\u0430\u044f IP-\u0430\u0434\u0440\u0435\u0441, \u0441\u0435\u0442\u0435\u0432\u043e\u0439 \u043f\u043e\u0440\u0442 \u0438 \u043e\u0442\u043a\u0440\u044b\u0442\u044b\u0439 DHT-\u043a\u043b\u044e\u0447 \u0436\u0435\u0440\u0442\u0432\u044b (\u0434\u0430\u043d\u043d\u044b\u0435 \u0441\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u0434\u043e\u0441\u0442\u0443\u043f\u043d\u044b \u043f\u0443\u0431\u043b\u0438\u0447\u043d\u043e \u0432 DHT, […]<\/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-102629","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\udd47A puffer t\u00falcsordul\u00e1sa a Toxcore-ban, amelyet UDP csomag k\u00fcld\u00e9s\u00e9vel haszn\u00e1lnak ki | ProHoster","description":"A Toxcore, a referencia P2P \u00fczenetk\u00fcld\u0151 protokoll implement\u00e1ci\u00f3j\u00e1ban felfedeztek egy sebezhet\u0151s\u00e9get (CVE-2021-44847), amely potenci\u00e1lisan lehet\u0151v\u00e9 teszi k\u00f3dv\u00e9grehajt\u00e1s kezdem\u00e9nyez\u00e9s\u00e9t, amikor egy speci\u00e1lisan form\u00e1zott UDP csomagot dolgoznak fel.","canonical_url":"https:\/\/prohoster.info\/hu\/blog\/news\/perepolnenie-bufera-v-toxcore-ekspluatiruemoe-cherez-otpravku-udp-paketa","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\u041f\u0435\u0440\u0435\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u0431\u0443\u0444\u0435\u0440\u0430 \u0432 Toxcore, \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0438\u0440\u0443\u0435\u043c\u043e\u0435 \u0447\u0435\u0440\u0435\u0437 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0443 UDP-\u043f\u0430\u043a\u0435\u0442\u0430 | ProHoster","og:description":"\u0412 Toxcore, \u044d\u0442\u0430\u043b\u043e\u043d\u043d\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 P2P-\u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 \u043e\u0431\u043c\u0435\u043d\u0430 \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u044f\u043c\u0438 Tox, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2021-44847), \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0438\u043d\u0438\u0446\u0438\u0438\u0440\u043e\u0432\u0430\u0442\u044c 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UDP-\u043f\u0430\u043a\u0435\u0442\u0430.","og:url":"https:\/\/prohoster.info\/hu\/blog\/news\/perepolnenie-bufera-v-toxcore-ekspluatiruemoe-cherez-otpravku-udp-paketa","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":"2021-12-16T01:36:46+00:00","article:modified_time":"2021-12-16T01:36:46+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":{"post_id":"102629","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":null,"breadcrumb_settings":null,"limit_modified_date":false,"reviewed_by":null,"ai":null,"created":"2021-12-16 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