{"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\/sv\/blog\/news\/uyazvimost-v-setevom-steke-yadra-linux","title":{"rendered":"S\u00e5rbarhet i Linux-k\u00e4rnans n\u00e4tverksstack","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

I koden f\u00f6r RDS-protokollet baserat p\u00e5 TCP (Reliable Datagram Socket, net\/rds\/tcp.c) har en s\u00e5rbarhet identifierats (CVE-2019-11815<\/a><\/noindex>), som kan leda till \u00e5tkomst till ett redan frigivet minnesomr\u00e5de och avbrott i tj\u00e4nsten (m\u00f6jligheten till utnyttjande av problemet f\u00f6r att genomf\u00f6ra kodexecution kan inte uteslutas). Problemet orsakas av en t\u00e4vlingssituation (race condition), som kan uppst\u00e5 vid utf\u00f6randet av funktionen rds_tcp_kill_sock under rensningen av sockets f\u00f6r n\u00e4tverksnamnrymd. <\/p>\n

I specifikationen NVD<\/a><\/noindex> \u00e4r problemet markerat som fj\u00e4rrutnyttjande \u00f6ver n\u00e4tverket, men enligt beskrivningen \u00e5tg\u00e4rden<\/a><\/noindex>, utan lokalt n\u00e4rvaro i systemet och manipulation av namnrymder g\u00e5r det inte att genomf\u00f6ra en attack p\u00e5 distans. S\u00e4rskilt enligt meningen<\/a><\/noindex> utvecklarna hos SUSE utnyttjas s\u00e5rbarheten endast lokalt, att organisera attacken \u00e4r tillr\u00e4ckligt komplicerat och kr\u00e4ver ytterligare privilegier i systemet. Om NVD bed\u00f6mer skadegraden till 9.3 (CVSS v2) och 8.1 (CVSS v2) po\u00e4ng, s\u00e5 bed\u00f6ms skadegraden av SUSE till 6.4 po\u00e4ng av 10. <\/p>\n

Representanter f\u00f6r Ubuntu har ocks\u00e5 bed\u00f6mt<\/a><\/noindex> denna s\u00e5rbarhet som m\u00e5ttlig. Samtidigt, enligt specifikationen CVSS v3.0, tilldelades problemet en h\u00f6g sv\u00e5righetsgrad av attack och m\u00f6jligheten till utnyttjande bed\u00f6mdes till enbart 2.2 po\u00e4ng av 10.<\/p>\n

Enligt rapporten<\/a><\/noindex> fr\u00e5n Cisco utnyttjas s\u00e5rbarheten p\u00e5 distans genom att skicka TCP-paket till aktiva n\u00e4tverkstj\u00e4nster RDS<\/a><\/noindex> och en prototyp av en exploit finns redan. Hur mycket denna information st\u00e4mmer \u00f6verens med verkligheten \u00e4r fortfarande oklart, det kan h\u00e4nda att rapporten bara konstn\u00e4rligt uttrycker antaganden fr\u00e5n NVD. Enligt information<\/a><\/noindex> VulDB har exploiten \u00e4nnu inte skapats och problemet utnyttjas endast lokalt.<\/p>\n

Problemet visar sig i k\u00e4rnor upp till 5.0.8 och blockeras av mars korrigeringen<\/a><\/noindex>, som ing\u00e5r i k\u00e4rnan 5.0.8. I de flesta distributioner f\u00f6rblir problemet o\u00e5tg\u00e4rdat (Debian<\/a><\/noindex>, RHEL<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, SUSE<\/a><\/noindex>). Korrigeringen har sl\u00e4ppts f\u00f6r SLE12 SP3, openSUSE 42.3 och Fedora<\/a><\/noindex>.<\/p>\n

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

K\u00e4lla: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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