{"id":35281,"date":"2019-10-31T22:03:25","date_gmt":"2019-10-31T19:03:25","guid":{"rendered":"https:\/\/prohoster.info\/blog\/massovaya-ataka-na-uyazvimye-pochtovye-servery-na-osnove-exim\/"},"modified":"2019-10-31T22:03:25","modified_gmt":"2019-10-31T19:03:25","slug":"massovaya-ataka-na-uyazvimye-pochtovye-servery-na-osnove-exim","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/massovaya-ataka-na-uyazvimye-pochtovye-servery-na-osnove-exim","title":{"rendered":"T\u00f6meges t\u00e1mad\u00e1s sebezhet\u0151 Exim alap\u00fa levelez\u0151szerverek ellen","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A Cybereason biztons\u00e1gi kutat\u00f3i warned<\/a><\/noindex> a levelez\u0151 szerverek adminisztr\u00e1torait figyelmeztetik egy massz\u00edv automatiz\u00e1lt t\u00e1mad\u00e1sra, amely kihaszn\u00e1lja a kritikus sebezhet\u0151s\u00e9get<\/a><\/noindex> (CVE-2019-10149) az Exim-ben, amelyet a m\u00falt h\u00e9ten fedeztek fel. A t\u00e1mad\u00e1s sor\u00e1n a t\u00e1mad\u00f3k root jogosults\u00e1gokkal futtatj\u00e1k a k\u00f3djukat, \u00e9s rosszindulat\u00fa programokat telep\u00edtenek a szerverre, hogy kriptovaluta b\u00e1ny\u00e1szatot v\u00e9gezzenek.<\/p>\n

A j\u00faniusi adattal \u00f6sszhangban automatiz\u00e1lt felm\u00e9r\u00e9s szerint<\/a><\/noindex> Az Exim r\u00e9szesed\u00e9se 57,05% (egy \u00e9ve 56,56%), a Postfix az e-mail szerverek 34,52%-\u00e1ban (33,79%) van jelen, a Sendmail 4,05%-ot (4,59%), a Microsoft Exchange 0,57%-ot (0,85%) k\u00e9pvisel. A adatok<\/a><\/noindex> Shodan szolg\u00e1ltat\u00e1s szerint potenci\u00e1lisan sebezhet\u0151 t\u00f6bb mint 3,6 milli\u00f3 levelez\u0151 szerver van a glob\u00e1lis h\u00e1l\u00f3zatban, amelyek nem friss\u00fcltek a legutols\u00f3 Exim 4.92 verzi\u00f3ra. K\u00f6r\u00fclbel\u00fcl 2 milli\u00f3 potenci\u00e1lisan sebezhet\u0151 szerver tal\u00e1lhat\u00f3 az Egyes\u00fclt \u00c1llamokban, 192 ezer pedig Oroszorsz\u00e1gban. A inform\u00e1ci\u00f3<\/a><\/noindex> RiskIQ c\u00e9g adatai szerint a 4.92-es verzi\u00f3ra m\u00e1r 70%-ra friss\u00edtettek az Exim szerverek k\u00f6z\u00fcl.<\/p>\n

\"T\u00f6meges<\/center><\/p>\n

Az adminisztr\u00e1toroknak s\u00fcrg\u0151sen telep\u00edteni\u00fck kell a m\u00falt h\u00e9ten k\u00e9sz\u00fclt friss\u00edt\u00e9seket (Debian<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, openSUSE<\/a><\/noindex>, Arch Linux<\/a><\/noindex>, Fedora<\/a><\/noindex>, EPEL a RHEL\/CentOS-hoz<\/a><\/noindex>). Amennyiben a rendszerben felett\u00e9bb sebezhet\u0151 Exim verzi\u00f3 tal\u00e1lhat\u00f3 (4.87\u20134.91 k\u00f6z\u00f6tt), meg kell gy\u0151z\u0151dni\u00fck arr\u00f3l, hogy a rendszer m\u00e1r nem s\u00e9r\u00fclt, ellen\u0151rizve a crontab-ot gyan\u00fas h\u00edv\u00e1sok ut\u00e1n, \u00e9s biztos\u00edtaniuk kell, hogy nincsenek kieg\u00e9sz\u00edt\u0151 kulcsok a \/root\/.ssh mapp\u00e1ban. A t\u00e1mad\u00e1sra utalhat a t\u0171zfal napl\u00f3j\u00e1ban \u00e9szlelt aktivit\u00e1s az an7kmd2wp4xo7hpr.tor2web.su, an7kmd2wp4xo7hpr.tor2web.io \u00e9s an7kmd2wp4xo7hpr.onion.sh c\u00edmekr\u0151l, amelyeket a rosszindulat\u00fa programok bet\u00f6lt\u00e9s\u00e9hez haszn\u00e1lnak. <\/p>\n

Az Exim szerverek elleni t\u00e1mad\u00e1si k\u00eds\u00e9rletek j\u00fan. 9-\u00e9n kezd\u0151dtek.<\/a><\/noindex> J\u00fan. 13-ra a t\u00e1mad\u00e1s t\u00f6meges<\/a><\/noindex> jelleget \u00f6lt\u00f6tt. Az sebezhet\u0151s\u00e9g kihaszn\u00e1l\u00e1sa ut\u00e1n a tor2web csatorn\u00e1kon a Tor rejtett szolg\u00e1ltat\u00e1s\u00e1b\u00f3l (an7kmd2wp4xo7hpr) egy szkript t\u00f6lthet\u0151 le, amely ellen\u0151rzi az OpenSSH megl\u00e9t\u00e9t (ha nincs,<\/a><\/noindex> telep\u00edti ), megv\u00e1ltoztatja annak be\u00e1ll\u00edt\u00e1sait (<\/a><\/noindex>root bel\u00e9p\u00e9s \u00e9s kulcs alap\u00fa hiteles\u00edt\u00e9s) \u00e9s telep\u00edt egyingyenes<\/a><\/noindex> RSA kulcsot , amely privilegiz\u00e1lt hozz\u00e1f\u00e9r\u00e9st ny\u00fajt a rendszerhez SSH-n kereszt\u00fcl.<\/a><\/noindex>, amely kiv\u00e9teles hozz\u00e1f\u00e9r\u00e9st biztos\u00edt a rendszerhez SSH-n kereszt\u00fcl.<\/p>\n

A h\u00e1tt\u00e9rprogram be\u00e1ll\u00edt\u00e1sa ut\u00e1n portszkenner ker\u00fcl a rendszerbe az egy\u00e9b sebezhet\u0151 szerverek azonos\u00edt\u00e1sa \u00e9rdek\u00e9ben. Emellett keres\u00e9st v\u00e9geznek a rendszerben m\u00e1r megl\u00e9v\u0151 b\u00e1ny\u00e1sz\u00f3 rendszerek ut\u00e1n, melyeket elt\u00e1vol\u00edtanak, ha felfedez\u00e9sre ker\u00fclnek. Az utols\u00f3 l\u00e9p\u00e9sben saj\u00e1t b\u00e1ny\u00e1sz\u00f3 ker\u00fcl bet\u00f6lt\u00e9sre \u00e9s a crontabba bejegyz\u00e9sre. A b\u00e1ny\u00e1sz\u00f3 ico-f\u00e1jl form\u00e1j\u00e1ban t\u00f6lt\u0151dik le (val\u00f3j\u00e1ban egy zip-arch\u00edvum a 'no-password' jelsz\u00f3val), amely tartalmaz egy v\u00e9grehajthat\u00f3 f\u00e1jlt ELF form\u00e1tumban Linuxhoz Glibc 2.7+ verzi\u00f3val.<\/p>\n

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

Forr\u00e1s: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Cybereason \u043f\u0440\u0435\u0434\u0443\u043f\u0440\u0435\u0434\u0438\u043b\u0438 \u0430\u0434\u043c\u0438\u043d\u0438\u0441\u0442\u0440\u0430\u0442\u043e\u0440\u043e\u0432 \u043f\u043e\u0447\u0442\u043e\u0432\u044b\u0445 \u0441\u0435\u0440\u0432\u0435\u0440\u043e\u0432 \u043e \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0438\u0438 \u043c\u0430\u0441\u0441\u043e\u0432\u043e\u0439 \u0430\u0432\u0442\u043e\u043c\u0430\u0442\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u0439 \u0430\u0442\u0430\u043a\u0438, \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0438\u0440\u0443\u044e\u0449\u0435\u0439 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0443\u044e \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2019-10149) \u0432 Exim, 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\u0438\u044e\u043d\u044c\u0441\u043a\u0438\u043c \u0430\u0432\u0442\u043e\u043c\u0430\u0442\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u043c \u043e\u043f\u0440\u043e\u0441\u043e\u043c \u0434\u043e\u043b\u044f Exim \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 57.05% (\u0433\u043e\u0434 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":26492,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-35281","post","type-post","status-publish","format-standard","has-post-thumbnail","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\udd47T\u00f6meges t\u00e1mad\u00e1s sebezhet\u0151 Exim alap\u00fa levelez\u0151szerverek 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