{"id":33548,"date":"2019-10-31T21:53:15","date_gmt":"2019-10-31T18:53:15","guid":{"rendered":"https:\/\/prohoster.info\/blog\/uyazvimost-v-setevom-steke-yadra-linux\/"},"modified":"2019-10-31T21:53:15","modified_gmt":"2019-10-31T18:53:15","slug":"uyazvimost-v-setevom-steke-yadra-linux","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/uyazvimost-v-setevom-steke-yadra-linux","title":{"rendered":"Zranitelnost v s\u00ed\u0165ov\u00e9m z\u00e1sobn\u00edku j\u00e1dra Linux","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Ve zdrojov\u00e9m k\u00f3du obsluhy protokolu RDS zalo\u017een\u00e9ho na TCP (Reliable Datagram Socket, net\/rds\/tcp.c) byla odhalena zranitelnost (CVE-2019-11815<\/a><\/noindex>), kter\u00e1 m\u016f\u017ee v\u00e9st k p\u0159\u00edstupu k ji\u017e uvoln\u011bn\u00e9 oblasti pam\u011bti a k odm\u00edtnut\u00ed slu\u017eby (potenci\u00e1ln\u011b nelze vylou\u010dit mo\u017enost zneu\u017eit\u00ed probl\u00e9mu k proveden\u00ed k\u00f3du). Probl\u00e9m je zp\u016fsoben z\u00e1vodem (race condition), kter\u00fd m\u016f\u017ee nastat p\u0159i vykon\u00e1v\u00e1n\u00ed funkce rds_tcp_kill_sock b\u011bhem \u010di\u0161t\u011bn\u00ed soket\u016f pro prostor s\u00edt\u00ed. <\/p>\n

Ve specifikaci NVD<\/a><\/noindex> je probl\u00e9m ozna\u010den jako vzd\u00e1len\u011b zneu\u017eiteln\u00fd, ale podle popisu opravy<\/a><\/noindex>, bez m\u00edstn\u00ed p\u0159\u00edtomnosti v syst\u00e9mu a manipulace s prostory s\u00edt\u00ed nelze \u00fatok zorganizovat vzd\u00e1len\u011b. Zejm\u00e9na podle n\u00e1zoru<\/a><\/noindex> v\u00fdvoj\u00e1\u0159\u016f SUSE je zranitelnost zneu\u017eiteln\u00e1 pouze lok\u00e1ln\u011b, organizace \u00fatoku je dost slo\u017eit\u00e1 a vy\u017eaduje dodate\u010dn\u00e9 privilegium v syst\u00e9mu. Pokud je v NVD \u00farove\u0148 nebezpe\u010dnosti hodnocena na 9.3 (CVSS v2) a 8.1 (CVSS v2) bod\u016f, podle hodnocen\u00ed SUSE je nebezpe\u010dnost ohodnocena na 6.4 bod\u016f z 10. <\/p>\n

P\u0159edstavitel\u00e9 Ubuntu tak\u00e9 zhodnotili<\/a><\/noindex> nebezpe\u010dnost probl\u00e9mu jako st\u0159edn\u00ed. P\u0159itom podle specifikace CVSS v3.0 byla probl\u00e9mu p\u0159i\u0159azena vysok\u00e1 \u00farove\u0148 slo\u017eitosti \u00fatoku a mo\u017enost zneu\u017eit\u00ed je hodnocena pouze na 2.2 bod\u016f z 10.<\/p>\n

S ohledem na zpr\u00e1vu<\/a><\/noindex> od spole\u010dnosti Cisco je zranitelnost zneu\u017eiteln\u00e1 vzd\u00e1len\u011b odesl\u00e1n\u00edm TCP paket\u016f na aktivn\u00ed s\u00ed\u0165ov\u00e9 slu\u017eby RDS<\/a><\/noindex> a ji\u017e existuje prototyp exploitu. Jak moc jsou tyto informace pravdiv\u00e9, zat\u00edm nen\u00ed jasn\u00e9, mo\u017en\u00e1 ve zpr\u00e1v\u011b jsou pouze um\u011ble vypov\u00edd\u00e1ny domn\u011bnky NVD. Podle informac\u00ed<\/a><\/noindex> VulDB exploity je\u0161t\u011b nebyly vytvo\u0159eny a probl\u00e9m je zneu\u017eiteln\u00fd pouze lok\u00e1ln\u011b.<\/p>\n

Probl\u00e9m se projevuje v j\u00e1drech do verze 5.0.8 a je zablokov\u00e1n b\u0159eznovou opravou<\/a><\/noindex>, kter\u00e1 byla za\u0159azena do j\u00e1dra 5.0.8. V drtiv\u00e9 v\u011bt\u0161in\u011b distribuc\u00ed probl\u00e9m z\u016fst\u00e1v\u00e1 neopraven\u00fd (Debian<\/a><\/noindex>, RHEL<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, SUSE<\/a><\/noindex>). Oprava byla vyd\u00e1na pro SLE12 SP3, openSUSE 42.3 a Fedora<\/a><\/noindex>.<\/p>\n

<\/a><\/noindex><\/p>\n

Zdroj: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u043a\u043e\u0434\u0435 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0430 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 RDS \u043d\u0430 \u0431\u0430\u0437\u0435 TCP (Reliable Datagram Socket, net\/rds\/tcp.c) \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2019-11815), \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u043e\u0431\u0440\u0430\u0449\u0435\u043d\u0438\u044e \u043a \u0443\u0436\u0435 \u043e\u0441\u0432\u043e\u0431\u043e\u0436\u0434\u0451\u043d\u043d\u043e\u0439 \u043e\u0431\u043b\u0430\u0441\u0442\u0438 \u043f\u0430\u043c\u044f\u0442\u0438 \u0438 \u043e\u0442\u043a\u0430\u0437\u0443 \u0432 \u043e\u0431\u0441\u043b\u0443\u0436\u0438\u0432\u0430\u043d\u0438\u0438 (\u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043d\u0435 \u0438\u0441\u043a\u043b\u044e\u0447\u0430\u0435\u0442\u0441\u044f \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0434\u043b\u044f \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u0430\u0446\u0438\u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043a\u043e\u0434\u0430). \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0432\u044b\u0437\u044b\u0432\u0430\u0435\u0442\u0441\u044f \u0441\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0435\u043c \u0433\u043e\u043d\u043a\u0438 (race condition), \u043a\u043e\u0442\u043e\u0440\u043e\u0435 \u043c\u043e\u0436\u0435\u0442 \u0432\u043e\u0437\u043d\u0438\u043a\u043d\u0443\u0442\u044c \u043f\u0440\u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0438 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 rds_tcp_kill_sock \u0432 \u043c\u043e\u043c\u0435\u043d\u0442 \u043e\u0447\u0438\u0441\u0442\u043a\u0438 […]<\/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-33548","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\udd47Zranitelnost v s\u00ed\u0165ov\u00e9m z\u00e1sobn\u00edku j\u00e1dra Linux | ProHoster","description":"Ve zdrojov\u00e9m k\u00f3du obsluhy protokolu RDS zalo\u017een\u00e9ho na TCP (Reliable Datagram Socket, net\/rds\/tcp.c) byla odhalena zranitelnost (","canonical_url":"https:\/\/prohoster.info\/cs\/blog\/news\/uyazvimost-v-setevom-steke-yadra-linux","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"cs_CZ","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 \u0441\u0435\u0442\u0435\u0432\u043e\u043c \u0441\u0442\u0435\u043a\u0435 \u044f\u0434\u0440\u0430 Linux | ProHoster","og:description":"\u0412 \u043a\u043e\u0434\u0435 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0430 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 RDS \u043d\u0430 \u0431\u0430\u0437\u0435 TCP (Reliable Datagram Socket, net\/rds\/tcp.c) \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (","og:url":"https:\/\/prohoster.info\/cs\/blog\/news\/uyazvimost-v-setevom-steke-yadra-linux","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":"2019-10-31T18:53:15+00:00","article:modified_time":"2019-10-31T18:53:15+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":{"post_id":"33548","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":null,"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":"2026-01-21 15:44:22","breadcrumb_settings":null,"limit_modified_date":false,"reviewed_by":null,"ai":null,"created":"2021-03-01 02:38:10","updated":"2026-01-21 15:44:22","focus_keyword":null,"additional_keywords":null,"truseo_locale":null},"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts\/33548","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/comments?post=33548"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts\/33548\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/media?parent=33548"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/categories?post=33548"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/tags?post=33548"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}