{"id":55464,"date":"2020-01-21T00:00:00","date_gmt":"2020-01-20T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/kak-kriticheskaya-uyazvimost-citrix-netscaler-cve-2019-19781-obnazhila-skrytye-problemy-it-otrasli"},"modified":"2020-02-18T14:03:35","modified_gmt":"2020-02-18T11:03:35","slug":"kak-kriticheskaya-uyazvimost-citrix-netscaler-cve-2019-19781-obnazhila-skrytye-problemy-it-otrasli","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/administrirovanie\/kak-kriticheskaya-uyazvimost-citrix-netscaler-cve-2019-19781-obnazhila-skrytye-problemy-it-otrasli","title":{"rendered":"A Playtonic Games st\u00fadi\u00f3 mikroblogj\u00e1n bejelentette a k\u00f6zelg\u0151t.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Kedves Olvas\u00f3, els\u0151sorban szeretn\u00e9m megjegyezni, hogy mivel N\u00e9metorsz\u00e1g lak\u00f3ja vagyok, els\u0151sorban itt zajl\u00f3 helyzetet \u00edrom le. Lehet, hogy a te orsz\u00e1godban a helyzet radik\u00e1lisan elt\u00e9r\u0151.<\/p>\n<p>2019. december 17-\u00e9n a Citrix Knowledge Center oldal\u00e1n k\u00f6zz\u00e9tett\u00e9k a Citrix Application Delivery Controller (NetScaler ADC) \u00e9s a Citrix Gateway, k\u00f6znyelvben NetScaler Gateway n\u00e9ven ismert term\u00e9kcsal\u00e1d kritikus sebezhet\u0151s\u00e9g\u00e9nek inform\u00e1ci\u00f3j\u00e1t. <noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex>K\u00e9s\u0151bb a sebezhet\u0151s\u00e9get a SD-WAN term\u00e9kcsal\u00e1dban is felfedezt\u00e9k. A sebezhet\u0151s\u00e9g minden term\u00e9kv\u00e1ltozatot \u00e9rintett, a 10.5-t\u0151l eg\u00e9szen a legfrissebb 13.0-ig, \u00e9s lehet\u0151v\u00e9 tette egy jogosulatlan t\u00e1mad\u00f3 sz\u00e1m\u00e1ra, hogy rosszindulat\u00fa k\u00f3dot futtasson a rendszeren, gyakorlatilag \u00e1talak\u00edtva a NetScaler-t arra, hogy tov\u00e1bbi t\u00e1mad\u00e1sok kiindul\u00f3pontja legyen a bels\u0151 h\u00e1l\u00f3zaton.<\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/support.citrix.com\/article\/CTX267027\">CTX267027: CVE-2019-19781 \u2014 Sebezhet\u0151s\u00e9g a Citrix Application Delivery Controller-ben<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/support.citrix.com\/article\/CTX267679\">CTX267679: L\u00e9p\u00e9sek a CVE-2019-19781 cs\u00f6kkent\u00e9s\u00e9re<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/support.citrix.com\/article\/CTX269180\">CTX269180: CVE-2019-19781 \u2013 Ellen\u0151rz\u0151 eszk\u00f6z (K\u00f6zz\u00e9t\u00e9ve: 2020.01.15!)<\/a><\/noindex><\/li>\n<\/ul>\n<p>\nA sebezhet\u0151s\u00e9g inform\u00e1ci\u00f3j\u00e1nak k\u00f6zz\u00e9t\u00e9tele egyidej\u0171leg a Citrix aj\u00e1nl\u00e1sait is tartalmazta a kock\u00e1zat cs\u00f6kkent\u00e9s\u00e9re (Workaround). A sebezhet\u0151s\u00e9g teljes megsz\u00fcntet\u00e9se csak 2020 janu\u00e1r v\u00e9g\u00e9re volt \u00edg\u00e9rve.<\/p>\n<p>A sebezhet\u0151s\u00e9g kritikalit\u00e1s\u00e1t (CVE-2019-19781) <noindex><a rel=\"nofollow\" href=\"https:\/\/nvd.nist.gov\/vuln\/detail\/CVE-2019-19781\">9.8 pontra \u00e9rt\u00e9kelt\u00e9k 10-b\u0151l<\/a><\/noindex>. A Positive Technologies t\u00e1j\u00e9koztat\u00e1sa szerint <noindex><a rel=\"nofollow\" href=\"https:\/\/www.ptsecurity.com\/ru-ru\/about\/news\/obnaruzhena-uyazvimost-v-po-citrix-pozvolyayushchaya-proniknut-v-seti-80-000-kompaniy\/\">a sebezhet\u0151s\u00e9g t\u00f6bb mint 80 000 c\u00e9get \u00e9rint vil\u00e1gszerte.<\/a><\/noindex> A lehets\u00e9ges reakci\u00f3 a h\u00edrre<\/p>\n<h3>Felel\u0151s emberk\u00e9nt azt felt\u00e9teleztem, hogy minden IT szakember, aki a NetScaler term\u00e9keket haszn\u00e1l a rendszer\u00e9ben, a k\u00f6vetkez\u0151k\u00e9ppen j\u00e1r el:<\/h3>\n<p>\nazonnal v\u00e9grehajtotta a CTX267679 cikkben megadott kock\u00e1zatminimaliz\u00e1l\u00f3 aj\u00e1nl\u00e1sokat.<\/p>\n<ol>\n<li>\u00e1tellen\u0151rizte a t\u0171zfal be\u00e1ll\u00edt\u00e1sait a NetScaler-b\u0151l a bels\u0151 h\u00e1l\u00f3zat ir\u00e1ny\u00e1ba enged\u00e9lyezett forgalom szempontj\u00e1b\u00f3l.<\/li>\n<li>aj\u00e1nlotta az IT-biztons\u00e1gi adminisztr\u00e1toroknak, hogy figyeljenek a NetScaler-hez val\u00f3 \"szokatlan\" hozz\u00e1f\u00e9r\u00e9si k\u00eds\u00e9rletekre, \u00e9s sz\u00fcks\u00e9g eset\u00e9n blokkolj\u00e1k azokat. Eml\u00e9keztetem, hogy a NetScaler \u00e1ltal\u00e1ban a DMZ-ben tal\u00e1lhat\u00f3.<\/li>\n<li>\u00e9rt\u00e9kelt\u00e9k a NetScaler ideiglenes lev\u00e1laszt\u00e1s\u00e1nak lehet\u0151s\u00e9g\u00e9t a h\u00e1l\u00f3zatr\u00f3l, am\u00edg r\u00e9szletesebb inform\u00e1ci\u00f3kat nem kapnak a probl\u00e9m\u00e1r\u00f3l. Az \u00fcnnepek alatt, nyaral\u00e1sok idej\u00e9n stb. ez nem lenne olyan f\u00e1jdalmas. Ezen k\u00edv\u00fcl sok c\u00e9gn\u00e9l van alternat\u00edv hozz\u00e1f\u00e9r\u00e9si lehet\u0151s\u00e9g VPN-en kereszt\u00fcl.<\/li>\n<li>Mi t\u00f6rt\u00e9nt ezut\u00e1n?<\/li>\n<\/ol>\n<p><\/p>\n<h3>Sajnos, ahogy k\u00e9s\u0151bb kider\u00fcl, a fent eml\u00edtett l\u00e9p\u00e9sek, amelyek a szok\u00e1sos megk\u00f6zel\u00edt\u00e9st k\u00e9pezik, a t\u00f6bbs\u00e9g \u00e1ltal figyelmen k\u00edv\u00fcl lettek hagyva.<\/h3>\n<p>\nEzeket a l\u00e9p\u00e9seket legt\u00f6bben figyelmen k\u00edv\u00fcl hagyt\u00e1k. <\/p>\n<p>Sokan, akik felel\u0151sek a Citrix-infrastrukt\u00far\u00e1\u00e9rt, csak 2020. janu\u00e1r 13-\u00e1n \u00e9rtes\u00fcltek a sebezhet\u0151s\u00e9gr\u0151l. <noindex><a rel=\"nofollow\" href=\"https:\/\/www.tagesschau.de\/investigativ\/swr\/citrix-sicherheitsluecke-101.html\">a k\u00f6zponti h\u00edrekb\u0151l<\/a><\/noindex>. Akkor \u00e9rtes\u00fcltek r\u00f3la, amikor a hat\u00e1sk\u00f6r\u00fck al\u00e1 tartoz\u00f3 rendszerek \u00f3ri\u00e1si r\u00e9sze m\u00e1r kompromitt\u00e1l\u00f3dott. A helyzet abszurdit\u00e1sa od\u00e1ig fajult, hogy a sz\u00fcks\u00e9ges exploitok teljesen <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/projectzeroindia\/CVE-2019-19781\">leg\u00e1lisan let\u00f6lthet\u0151k az interneten.<\/a><\/noindex>.<br \/>\nValami\u00e9rt azt hittem, hogy az IT-szakemberek olvass\u00e1k a gy\u00e1rt\u00f3k h\u00edrleveleit, tudj\u00e1k, hogyan kell haszn\u00e1lni a Twittert, k\u00f6vetik a vezet\u0151 szakembereket a ter\u00fclet\u00fck\u00f6n, \u00e9s k\u00f6telesek t\u00e1j\u00e9koz\u00f3dni az aktu\u00e1lis esem\u00e9nyekr\u0151l.<\/p>\n<p>Val\u00f3j\u00e1ban t\u00f6bb mint h\u00e1rom h\u00e9t eltelt\u00e9vel sz\u00e1mos Citrix-\u00fcgyf\u00e9l teljesen figyelmen k\u00edv\u00fcl hagyta a gy\u00e1rt\u00f3 aj\u00e1nl\u00e1sait. A Citrix \u00fcgyfelei gyakorlatilag minden nagy \u00e9s k\u00f6zepes m\u00e9ret\u0171 n\u00e9met v\u00e1llalat, valamint szinte minden \u00e1llami int\u00e9zm\u00e9ny. Els\u0151sorban a sebezhet\u0151s\u00e9g \u00e9ppen a k\u00f6zigazgat\u00e1si strukt\u00far\u00e1kat \u00e9rintette.<\/p>\n<h3>Viszont van mit csin\u00e1lni.<\/h3>\n<p>\nAzok sz\u00e1m\u00e1ra, akiknek a rendszereit kompromitt\u00e1lt\u00e1k, sz\u00fcks\u00e9ges a teljes \u00fajratelep\u00edt\u00e9s, bele\u00e9rtve a TSL-tan\u00fas\u00edtv\u00e1nyok cser\u00e9j\u00e9t is. Lehets\u00e9ges, hogy azok a Citrix-\u00fcgyfelek, akik akt\u00edvabb l\u00e9p\u00e9seket v\u00e1rtak a gy\u00e1rt\u00f3t\u00f3l a kritikus sebezhet\u0151s\u00e9g megsz\u00fcntet\u00e9se \u00e9rdek\u00e9ben, komolyan fontol\u00f3ra veszik az alternat\u00edv\u00e1k keres\u00e9s\u00e9t. Be kell vallani, hogy a Citrix reakci\u00f3ja nem t\u00fal biztat\u00f3.<\/p>\n<h3>T\u00f6bb a k\u00e9rd\u00e9s, mint a v\u00e1lasz.<\/h3>\n<p>\nFelk\u00e9rdez\u0151dik, hogy mivel foglalkoztak a Citrix sz\u00e1mos partnere, k\u00fcl\u00f6n\u00f6sen a platinum \u00e9s gold partnerek? Mi\u00e9rt csak 2020 harmadik het\u00e9ben jelent meg n\u00e9h\u00e1ny partner oldalon a sz\u00fcks\u00e9ges inform\u00e1ci\u00f3? Nyilv\u00e1nval\u00f3, hogy a j\u00f3l megfizetett k\u00fcls\u0151 tan\u00e1csad\u00f3k is lek\u00e9st\u00e9k ezt a vesz\u00e9lyes helyzetet. Nem szeretn\u00e9k senkit megb\u00e1ntani, de a partner feladata els\u0151sorban a probl\u00e9m\u00e1k megel\u0151z\u00e9se, nem pedig a megold\u00e1sukra val\u00f3 seg\u00edts\u00e9gny\u00fajt\u00e1s = elad\u00e1s.<\/p>\n<p>Val\u00f3j\u00e1ban ez a helyzet megmutatta az IT-biztons\u00e1g val\u00f3s \u00e1llapot\u00e1t. Az IT-oszt\u00e1lyok dolgoz\u00f3inak, valamint a Citrix partnereinek tan\u00e1csad\u00f3inak meg kell \u00e9rteni\u00fck egy igazs\u00e1got: ha van sebezhet\u0151s\u00e9g, azt meg kell sz\u00fcntetni. A kritikus sebezhet\u0151s\u00e9get pedig azonnal el kell h\u00e1r\u00edtani!<br \/>\n<br \/>Forr\u00e1s: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/484548\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0414\u043e\u0440\u043e\u0433\u043e\u0439 \u0447\u0438\u0442\u0430\u0442\u0435\u043b\u044c, \u043f\u0440\u0435\u0436\u0434\u0435 \u0432\u0441\u0435\u0433\u043e \u0445\u043e\u0442\u0435\u043b\u043e\u0441\u044c \u0431\u044b \u0443\u043a\u0430\u0437\u0430\u0442\u044c \u043d\u0430 \u0442\u043e, \u0447\u0442\u043e \u0431\u0443\u0434\u0443\u0447\u0438 \u0436\u0438\u0442\u0435\u043b\u0435\u043c \u0413\u0435\u0440\u043c\u0430\u043d\u0438\u0438, \u044f \u043f\u0440\u0435\u0436\u0434\u0435 \u0432\u0441\u0435\u0433\u043e \u043e\u043f\u0438\u0441\u044b\u0432\u0430\u044e \u0441\u0438\u0442\u0443\u0430\u0446\u0438\u044e \u0432 \u0434\u0430\u043d\u043d\u043e\u0439 \u0441\u0442\u0440\u0430\u043d\u0435. \u0412\u043e\u0437\u043c\u043e\u0436\u043d\u043e, \u0432 \u0432\u0430\u0448\u0435\u0439 \u0441\u0442\u0440\u0430\u043d\u0435 \u0441\u0438\u0442\u0443\u0430\u0446\u0438\u044f \u043a\u0430\u0440\u0434\u0438\u043d\u0430\u043b\u044c\u043d\u043e \u0438\u043d\u0430\u044f. 17 \u0434\u0435\u043a\u0430\u0431\u0440\u044f 2019 \u0433\u043e\u0434\u0430 \u043d\u0430 \u0441\u0442\u0440\u0430\u043d\u0438\u0446\u0435 Citrix Knowledge Center \u0431\u044b\u043b\u0430 \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u0430 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f \u043e \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u043e\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432 \u043b\u0438\u043d\u0435\u0439\u043a\u0430\u0445 \u043f\u0440\u043e\u0434\u0443\u043a\u0442\u043e\u0432 Citrix Application Delivery Controller (NetScaler ADC) \u0438 Citrix Gateway, [&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":[688],"tags":[],"class_list":["post-55464","post","type-post","status-publish","format-standard","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0414\u043e\u0440\u043e\u0433\u043e\u0439 \u0447\u0438\u0442\u0430\u0442\u0435\u043b\u044c, \u043f\u0440\u0435\u0436\u0434\u0435 \u0432\u0441\u0435\u0433\u043e \u0445\u043e\u0442\u0435\u043b\u043e\u0441\u044c \u0431\u044b \u0443\u043a\u0430\u0437\u0430\u0442\u044c \u043d\u0430 \u0442\u043e, \u0447\u0442\u043e \u0431\u0443\u0434\u0443\u0447\u0438 \u0436\u0438\u0442\u0435\u043b\u0435\u043c \u0413\u0435\u0440\u043c\u0430\u043d\u0438\u0438, \u044f 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