{"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\/hu\/blog\/news\/udalyonno-ekspluatiruemye-uyazvimosti-vo-freebsd","title":{"rendered":"T\u00e1volr\u00f3l kihaszn\u00e1lhat\u00f3 s\u00e9r\u00fcl\u00e9kenys\u00e9gek a FreeBSD-ben","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>A FreeBSD <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2020-May\/thread.html\">hanem<\/a><\/noindex> \u00d6t sebezhet\u0151s\u00e9g, amelyek k\u00f6z\u00f6tt vannak probl\u00e9m\u00e1k, amelyek potenci\u00e1lisan adat\u00edr\u00e1sa a kernel szintj\u00e9n, amikor bizonyos h\u00e1l\u00f3zati csomagokat k\u00fcldnek, vagy lehet\u0151v\u00e9 teszik a helyi felhaszn\u00e1l\u00f3 sz\u00e1m\u00e1ra, hogy emelje a jogosults\u00e1gait. A sebezhet\u0151s\u00e9gek jav\u00edtva lettek a 12.1-RELEASE-p5 \u00e9s 11.3-RELEASE-p9 friss\u00edt\u00e9sekben. <\/p>\n<p>A legvesz\u00e9lyesebb sebezhet\u0151s\u00e9g (<noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2020-May\/001950.html\">CVE-2020-7454<\/a><\/noindex>) a libalias k\u00f6nyvt\u00e1rban a csomag m\u00e9ret\u00e9nek helytelen ellen\u0151rz\u00e9se miatt l\u00e9p fel, amikor a protokoll-specifikus fejl\u00e9cet elemzik. A libalias k\u00f6nyvt\u00e1r alkalmazva van az ipfw csomagsz\u0171r\u0151ben az IP-c\u00edmek ford\u00edt\u00e1s\u00e1ra, \u00e9s tartalmazza az IP-csomagok c\u00edmeinek helyettes\u00edt\u00e9s\u00e9hez \u00e9s a protokollok elemz\u00e9s\u00e9hez sz\u00fcks\u00e9ges alapvet\u0151 funkci\u00f3kat. A sebezhet\u0151s\u00e9g lehet\u0151v\u00e9 teszi, hogy speci\u00e1lisan form\u00e1zott h\u00e1l\u00f3zati csomag k\u00fcld\u00e9s\u00e9vel az adatokat olvass\u00e1k vagy \u00edrj\u00e1k a kernel mem\u00f3riak\u00f6zel\u00e9be (NAT implement\u00e1ci\u00f3 haszn\u00e1lata eset\u00e9n a kernelben) vagy a natd folyamathoz.<br \/>\nA probl\u00e9ma nem \u00e9rinti azokat a NAT konfigur\u00e1ci\u00f3kat, amelyeket pf \u00e9s ipf csomagsz\u0171r\u0151k haszn\u00e1lat\u00e1val \u00e9p\u00edtettek, valamint az ipfw konfigur\u00e1ci\u00f3kat, amelyekben nem alkalmazz\u00e1k a NAT-ot. <\/p>\n<p>Egy\u00e9b sebezhet\u0151s\u00e9gek:<\/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 egy \u00faj t\u00e1voli kihaszn\u00e1lhat\u00f3 s\u00e9r\u00fcl\u00e9kenys\u00e9g a libalias-ban, amely a csomagok hossz\u00e1nak helytelen sz\u00e1m\u00edt\u00e1s\u00e1hoz kapcsol\u00f3dik az FTP kezel\u0151j\u00e9ben. A probl\u00e9ma a kernel vagy a natd folyamat mem\u00f3ri\u00e1j\u00e1b\u00f3l sz\u00e1rmaz\u00f3 n\u00e9h\u00e1ny b\u00e1jt adat kisziv\u00e1rg\u00e1s\u00e1ra korl\u00e1toz\u00f3dik.\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 s\u00e9r\u00fcl\u00e9kenys\u00e9g a cryptodev modulban, amely a m\u00e1r felszabad\u00edtott mem\u00f3ria ter\u00fclethez val\u00f3 hozz\u00e1f\u00e9r\u00e9s (use-after-free) miatt keletkezik, \u00e9s lehet\u0151v\u00e9 teszi, hogy egy nem privilegiz\u00e1lt folyamat tetsz\u0151leges kernel mem\u00f3ria ter\u00fcleteket fel\u00fcl\u00edrjon. A s\u00e9r\u00fcl\u00e9kenys\u00e9g blokkol\u00e1s\u00e1nak ker\u00fcl\u0151\u00fatk\u00e9nt aj\u00e1nlott a cryptodev modul le\u00e1ll\u00edt\u00e1sa a 'kldunload cryptodev' parancs seg\u00edts\u00e9g\u00e9vel, ha az bet\u00f6lt\u00e9sre ker\u00fclt (alap\u00e9rtelmezetten a cryptodev nem t\u00f6lt\u0151dik be). A cryptodev modul hozz\u00e1f\u00e9r\u00e9st biztos\u00edt a felhaszn\u00e1l\u00f3i t\u00e9rb\u0151l sz\u00e1rmaz\u00f3 alkalmaz\u00e1sok sz\u00e1m\u00e1ra a \/dev\/crypto interf\u00e9szhez, amely a kriptogr\u00e1fiai m\u0171veletek hardveres gyors\u00edt\u00e1s\u00e1nak mechanizmusaihoz val\u00f3 hozz\u00e1f\u00e9r\u00e9st ny\u00fajt (az AES-NI \u00e9s az OpenSSL \/dev\/crypto nem haszn\u00e1lhat\u00f3).\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 a cryptodev m\u00e1sodik s\u00e9r\u00fcl\u00e9kenys\u00e9ge, amely lehet\u0151v\u00e9 teszi, hogy egy nem privilegiz\u00e1lt felhaszn\u00e1l\u00f3 a kernel \u00f6sszeoml\u00e1s\u00e1t kezdem\u00e9nyezze, ha hib\u00e1s MAC-val k\u00e9r kriptogr\u00e1fiai m\u0171veletet. A probl\u00e9ma a MAC-kulcs m\u00e9ret\u00e9nek ellen\u0151rz\u00e9s\u00e9nek hi\u00e1ny\u00e1b\u00f3l ad\u00f3dik a t\u00e1rol\u00e1s\u00e1hoz sz\u00fcks\u00e9ges puffer allok\u00e1l\u00e1sa sor\u00e1n (a puffert a felhaszn\u00e1l\u00f3 \u00e1ltal megadott m\u00e9ret alapj\u00e1n hozt\u00e1k l\u00e9tre, a t\u00e9nyleges m\u00e9ret ellen\u0151rz\u00e9se n\u00e9lk\u00fcl).\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 s\u00e9r\u00fcl\u00e9kenys\u00e9g az SCTP (Stream Control Transmission Protocol) protokoll implement\u00e1ci\u00f3j\u00e1ban, amely a SCTP-AUTH kiterjeszt\u00e9s \u00e1ltal haszn\u00e1lt megosztott kulcs helytelen ellen\u0151rz\u00e9s\u00e9b\u0151l fakad a SCTP szekvenci\u00e1k hiteles\u00edt\u00e9s\u00e9hez. A helyi alkalmaz\u00e1s a Socket API-n kereszt\u00fcl friss\u00edtheti a kulcsot, mik\u00f6zben megszak\u00edtja az SCTP kapcsolatot, ami a m\u00e1r felszabad\u00edtott mem\u00f3ria ter\u00fclethez val\u00f3 hozz\u00e1f\u00e9r\u00e9shez (use-after-free) vezethet.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Forr\u00e1s: <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 5.0.3 - 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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