{"id":93183,"date":"2020-09-04T07:42:02","date_gmt":"2020-09-04T05:42:02","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-realizaczii-soketov-af_packet-yadra-linux"},"modified":"2020-09-04T07:42:02","modified_gmt":"2020-09-04T05:42:02","slug":"uyazvimost-v-realizaczii-soketov-af_packet-yadra-linux","status":"publish","type":"post","link":"https:\/\/prohoster.info\/nl\/blog\/news\/uyazvimost-v-realizaczii-soketov-af_packet-yadra-linux","title":{"rendered":"Kwetsbaarheid in de implementatie van AF_PACKET-sockets in de Linux-kernel","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Drie jaar na de golf van kwetsbaarheden (1<\/a><\/noindex>, 2<\/a><\/noindex>, 3<\/a><\/noindex>, 4<\/a><\/noindex>, 5<\/a><\/noindex>) in de AF_PACKET-subsystemen van de Linux-kernel gedetecteerd<\/a><\/noindex> is er opnieuw een probleem (CVE-2020-14386<\/a><\/noindex>), waarmee een lokale niet-bevoorrechte gebruiker code met root-rechten kan uitvoeren of uit ge\u00efsoleerde containers kan ontsnappen, mits deze root-toegang hebben.<\/p>\n

Voor het aanmaken van een AF_PACKET-socket en het uitbuiten van de kwetsbaarheid zijn CAP_NET_RAW-rechten vereist. Echter, deze rechten kunnen door een niet-bevoorrechte gebruiker in containers worden verkregen die zijn aangemaakt op systemen met ingeschakelde ondersteuning voor gebruikersnamespace (user namespaces). Bijvoorbeeld, gebruikersnamespaces zijn standaard ingeschakeld in Ubuntu en Fedora, maar zijn niet geactiveerd in Debian en RHEL. In Android heeft het proces mediaserver het recht om AF_PACKET-sockets aan te maken, waarmee de kwetsbaarheid kan worden uitgebuit.<\/p>\n

De kwetsbaarheid bevindt zich in de functie tpacket_rcv en wordt veroorzaakt door een fout in de berekening van de variabele netoff. Een aanvaller kan omstandigheden cre\u00ebren waardoor de variabele netoff een waarde kleiner dan de variabele maclen krijgt, wat een overflow zal veroorzaken bij de berekening van \"macoff = netoff - maclen\" en een onjuiste latere instelling van de pointer naar de buffer voor binnenkomende gegevens. Dit kan leiden tot het initi\u00ebren van het schrijven van 1 tot 10 bytes in een gebied buiten de toegewezen buffer door aanvallers. Er wordt opgemerkt dat er een exploit in ontwikkeling is die root-rechten in het systeem kan verkrijgen. <\/p>\n

Het probleem is aanwezig in de kernel sinds juli 2008, d.w.z. het komt voor in alle actuele kernels. Een patch is momenteel beschikbaar in de vorm van patch<\/a><\/noindex>. Updates voor pakketten in distributies kunnen worden bijgehouden op de volgende pagina's: Ubuntu<\/a><\/noindex>, Fedora<\/a><\/noindex>, SUSE<\/a><\/noindex>, Debian<\/a><\/noindex>, RHEL<\/a><\/noindex>, Arch<\/a><\/noindex>.<\/p>\n

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

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

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[…]<\/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-93183","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\udd47Kwetsbaarheid in de implementatie van AF_PACKET-sockets van de Linux-kernel | ProHoster","description":"Drie jaar na de golf van kwetsbaarheden (1,","canonical_url":"https:\/\/prohoster.info\/nl\/blog\/news\/uyazvimost-v-realizaczii-soketov-af_packet-yadra-linux","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"nl_NL","og:site_name":"ProHoster | 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