{"id":81560,"date":"2020-05-14T19:42:19","date_gmt":"2020-05-14T17:42:19","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/udalyonno-ekspluatiruemye-uyazvimosti-vo-freebsd"},"modified":"2020-05-14T19:42:19","modified_gmt":"2020-05-14T17:42:19","slug":"udalyonno-ekspluatiruemye-uyazvimosti-vo-freebsd","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sv\/blog\/news\/udalyonno-ekspluatiruemye-uyazvimosti-vo-freebsd","title":{"rendered":"Fj\u00e4rran utnyttjade s\u00e5rbarheter i FreeBSD","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>I FreeBSD <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2020-May\/thread.html\">flera s\u00e5rbarheter har \u00e5tg\u00e4rdats:<\/a><\/noindex> Fem s\u00e5rbarheter, varav en potentiellt kan leda till dataskrivning p\u00e5 k\u00e4rnniv\u00e5 genom att skicka specifika n\u00e4tverkspaket, eller m\u00f6jligg\u00f6r f\u00f6r en lokal anv\u00e4ndare att h\u00f6ja sina privilegier. S\u00e5rbarheterna har \u00e5tg\u00e4rdats i uppdateringarna 12.1-RELEASE-p5 och 11.3-RELEASE-p9. <\/p>\n<p>Den mest allvarliga s\u00e5rbarheten (<noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2020-May\/001950.html\">CVE-2020-7454<\/a><\/noindex>) orsakas av bristande kontroll av paketstorleken i biblioteket libalias vid analys av protokollspecifika rubriker. Biblioteket libalias anv\u00e4nds i paketfilter ipfw f\u00f6r adress\u00f6vers\u00e4ttning och inneh\u00e5ller typiska funktioner f\u00f6r adressers\u00e4ttning i IP-paket och analys av protokoll. S\u00e5rbarheten m\u00f6jligg\u00f6r l\u00e4sning eller skrivning av data i k\u00e4rnans minnesomr\u00e5de (vid anv\u00e4ndning av NAT-implementering i k\u00e4rnan) eller i processen<br \/>\nnatd (vid anv\u00e4ndning av NAT-implementering i anv\u00e4ndarrummet). Problemet p\u00e5verkar inte NAT-konfigurationer som byggs med paketfilter pf och ipf, eller ipfw-konfigurationer d\u00e4r NAT inte anv\u00e4nds. <\/p>\n<p>\u00d6vriga s\u00e5rbarheter:<\/p>\n<ul>\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2020-May\/001951.html\">CVE-2020-7455<\/a><\/noindex> \u2014 \u00e4nnu en fj\u00e4rrutnyttjad s\u00e5rbarhet i libalias, relaterad till felaktig ber\u00e4kning av paketl\u00e4ngd i FTP-processor. Problemet begr\u00e4nsas till l\u00e4ckage av n\u00e5gra byte data fr\u00e5n k\u00e4rnans eller natd-processens minnesomr\u00e5de.\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2020-May\/001953.html\">CVE-2019-15879<\/a><\/noindex> \u2014 en s\u00e5rbarhet i modulens cryptodev, orsakad av \u00e5tkomst till ett redan frigivet minnesomr\u00e5de (use-after-free), som till\u00e5ter en obeh\u00f6rig process att skriva \u00f6ver godtyckliga omr\u00e5den i k\u00e4rnans minne. Som en tillf\u00e4llig l\u00f6sning f\u00f6r att blockera s\u00e5rbarheten rekommenderas att avlastar modulen cryptodev med kommandot \u00abkldunload cryptodev\u00bb, om den har laddats (som standard laddas inte cryptodev). Modulen cryptodev ger anv\u00e4ndarutrymmesapplikationer \u00e5tkomst till gr\u00e4nssnittet \/dev\/crypto f\u00f6r att anv\u00e4nda h\u00e5rdvaruaccelerationsmekanismer f\u00f6r kryptografiska operationer (i AES-NI och OpenSSL anv\u00e4nds inte \/dev\/crypto).\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2020-May\/001954.html\">CVE-2019-15880<\/a><\/noindex> \u2014 den andra s\u00e5rbarheten i cryptodev, som till\u00e5ter en obeh\u00f6rig anv\u00e4ndare att initiera en k\u00e4rnkrasch genom att skicka en beg\u00e4ran om att utf\u00f6ra en kryptografisk operation med en felaktig MAC. Problemet orsakas av bristen p\u00e5 kontroll av MAC-nyckelns storlek vid tilldelning av en buffer f\u00f6r dess lagring (bufferten skapades baserat p\u00e5 de anv\u00e4ndar\u00f6verf\u00f6rda storleksuppgifterna, utan kontroll av den faktiska storleken).\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2020-May\/001952.html\">CVE-2019-15878<\/a><\/noindex> \u2014 en s\u00e5rbarhet i implementeringen av SCTP-protokollet (Stream Control Transmission Protocol), orsakad av felaktig kontroll av den delade nyckeln som anv\u00e4nds av SCTP-AUTH-utvidgningen f\u00f6r autentisering av SCTP-sekvenser. En lokal applikation kan via Socket API uppdatera nyckeln, samtidigt som den avbryter SCTP-anslutningen, vilket leder till en \u00e5tkomst till ett redan frigivet minnesomr\u00e5de (use-after-free).\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>K\u00e4lla: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52948\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412\u043e FreeBSD \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u043e \u043f\u044f\u0442\u044c \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, \u0441\u0440\u0435\u0434\u0438 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0438\u043c\u0435\u044e\u0442\u0441\u044f \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043c\u043e\u0433\u0443\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u043f\u0435\u0440\u0435\u0437\u0430\u043f\u0438\u0441\u0438 \u0434\u0430\u043d\u043d\u044b\u0445 \u043d\u0430 \u0443\u0440\u043e\u0432\u043d\u0435 \u044f\u0434\u0440\u0430 \u043f\u0440\u0438 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0435 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u044b\u0445 \u0441\u0435\u0442\u0435\u0432\u044b\u0445 \u043f\u0430\u043a\u0435\u0442\u043e\u0432 \u0438\u043b\u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0442 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u043f\u043e\u0432\u044b\u0441\u0438\u0442\u044c \u0441\u0432\u043e\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u044b \u0432 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f\u0445 12.1-RELEASE-p5 \u0438 11.3-RELEASE-p9. \u041d\u0430\u0438\u0431\u043e\u043b\u0435\u0435 \u043e\u043f\u0430\u0441\u043d\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2020-7454) \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u043e\u0442\u0441\u0443\u0442\u0441\u0442\u0432\u0438\u0435\u043c \u0434\u043e\u043b\u0436\u043d\u043e\u0439 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u0440\u0430\u0437\u043c\u0435\u0440\u0430 \u043f\u0430\u043a\u0435\u0442\u0430 \u0432 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0435 libalias \u043f\u0440\u0438 \u0440\u0430\u0437\u0431\u043e\u0440\u0435 \u0441\u043f\u0435\u0446\u0438\u0444\u0438\u0447\u043d\u044b\u0445 \u0434\u043b\u044f [&hellip;]<\/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-81560","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412\u043e FreeBSD \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u043e \u043f\u044f\u0442\u044c \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, \u0441\u0440\u0435\u0434\u0438 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0438\u043c\u0435\u044e\u0442\u0441\u044f \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e.\" \/>\n\t<meta name=\"robots\" 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