{"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\/da\/blog\/news\/perepolnenie-bufera-v-toxcore-ekspluatiruemoe-cherez-otpravku-udp-paketa","title":{"rendered":"Buffer overflow in Toxcore, exploited through sending a UDP packet","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

In Toxcore, the reference implementation of the P2P messaging protocol Tox, a vulnerability (CVE-2021-44847) has been identified that potentially allows remote code execution when processing a specially crafted UDP packet. All users of applications based on Toxcore that have not disabled UDP transport are vulnerable. An attack can be initiated by sending a UDP packet if the IP address, network port, and open DHT key of the victim are known (this information is publicly available in DHT, meaning the attack could be carried out against any user or DHT node). <\/p>\n

The issue was present in Toxcore releases from 0.1.9 to 0.2.12 and was fixed in version 0.2.13. So far, only the qTox project has released updates addressing the vulnerability among client applications. As a workaround for protection, UDP can be disabled while retaining support for TCP. <\/p>\n

S\u00e5rbarheden er for\u00e5rsaget af en buffer-overl\u00f8b i funktionen handle_request(), der opst\u00e5r p\u00e5 grund af en forkert beregning af dataenes st\u00f8rrelse i netv\u00e6rkspakken. Is\u00e6r blev l\u00e6ngden af de krypterede data bestemt i makroen CRYPTO_SIZE, defineret som '1 + CRYPTO_PUBLIC_KEY_SIZE * 2 + CRYPTO_NONCE_SIZE', som derefter blev brugt i subtraktionen 'length - CRYPTO_SIZE'. P\u00e5 grund af mangel p\u00e5 parenteser i makroen blev der i stedet for subtraktion af summen af alle v\u00e6rdier udf\u00f8rt en subtraktion af 1 og en addition af de \u00f8vrige dele. For eksempel, i stedet for 'length - (1 + 32 * 2 + 24)' blev bufferens st\u00f8rrelse beregnet som 'length - 1 + 32 * 2 + 24', hvilket f\u00f8rte til overskrivning af data p\u00e5 stakken, der ligger uden for bufferen.
\n
Kilde: 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\udd47Buffer overflow in Toxcore, exploited through sending a UDP packet | ProHoster","description":"In Toxcore, the reference implementation of the P2P messaging protocol Tox, a vulnerability (CVE-2021-44847) has been identified that 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\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 \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.","og:url":"https:\/\/prohoster.info\/da\/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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