{"id":98911,"date":"2021-01-21T14:42:14","date_gmt":"2021-01-21T12:42:14","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/dnspooq-sem-novyh-uyazvimostej-v-dnsmasq"},"modified":"2021-01-21T14:42:14","modified_gmt":"2021-01-21T12:42:14","slug":"dnspooq-sem-novyh-uyazvimostej-v-dnsmasq","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/dnspooq-sem-novyh-uyazvimostej-v-dnsmasq","title":{"rendered":"DNSpooq \u2013 h\u00e9t \u00faj s\u00e9r\u00fcl\u00e9kenys\u00e9g a dnsmasq-ban","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A JSOF kutat\u00f3 laborat\u00f3rium szakemberei h\u00e9t \u00faj sebezhet\u0151s\u00e9gr\u0151l sz\u00e1moltak be a dnsmasq DNS\/DHCP szerver\u00e9n. A dnsmasq szerver rendk\u00edv\u00fcl n\u00e9pszer\u0171, \u00e9s alap\u00e9rtelmez\u00e9s szerint sok Linux disztrib\u00faci\u00f3ban, valamint Cisco, Ubiquiti \u00e9s m\u00e1s h\u00e1l\u00f3zati berendez\u00e9sekben haszn\u00e1lj\u00e1k. A Dnspooq sebezhet\u0151s\u00e9gek k\u00f6z\u00e9 tartozik a DNS-k\u00e9szlet m\u00e9rgez\u00e9se \u00e9s a t\u00e1voli k\u00f3dv\u00e9grehajt\u00e1s. A sebezhet\u0151s\u00e9geket a dnsmasq 2.83 verzi\u00f3j\u00e1ban jav\u00edtott\u00e1k.<\/p>\n

2008-ban a biztons\u00e1gi kutat\u00f3, Dan Kaminsky felfedezett \u00e9s nyilv\u00e1noss\u00e1gra hozott egy alapvet\u0151 hi\u00e1nyoss\u00e1got az Internet DNS mechanizmus\u00e1ban. Kaminsky bizony\u00edtotta, hogy a t\u00e1mad\u00f3k k\u00e9pesek hamis\u00edtani az c\u00edmeket domainok<\/a> \u00e9s adatokat lopni. Az\u00f3ta ezt «Kaminski-t\u00e1mad\u00e1snak» nevezik.<\/p>\n

A DNS \u00e9vtizedek \u00f3ta biztons\u00e1gtalan protokollnak sz\u00e1m\u00edt, b\u00e1r azt felt\u00e9telezik, hogy biztos\u00edt egy bizonyos szint\u0171 integrit\u00e1st. \u00c9ppen ez\u00e9rt m\u00e9g mindig nagym\u00e9rt\u00e9kben t\u00e1maszkodnak r\u00e1. Ugyanakkor biztons\u00e1gi mechanizmusokat dolgoztak ki a DNS alap protokollj\u00e1nak fejleszt\u00e9s\u00e9re. Ezek a mechanizmusok k\u00f6z\u00e9 tartozik a HTTPS, HSTS, DNSSEC \u00e9s m\u00e1s kezdem\u00e9nyez\u00e9sek. Mindazon\u00e1ltal, m\u00e9g a fenti mechanizmusokkal egy\u00fctt is, a DNS elfog\u00e1s m\u00e9g mindig vesz\u00e9lyes t\u00e1mad\u00e1snak sz\u00e1m\u00edt 2021-ben. Az internet legnagyobb r\u00e9sze tov\u00e1bbra is \u00fagy t\u00e1maszkodik a DNS-re, mint 2008-ban, \u00e9s ki van t\u00e9ve az ilyen t\u00edpus\u00fa t\u00e1mad\u00e1soknak.<\/p>\n

A DNSpooq DNS-k\u00e9szlet m\u00e9rgez\u00e9si sebezhet\u0151s\u00e9gek:
\nCVE-2020-25686, CVE-2020-25684, CVE-2020-25685. Ezek a sebezhet\u0151s\u00e9gek hasonl\u00edtanak a nemr\u00e9giben a Kaliforniai Egyetem \u00e9s a Tsinghua Egyetem kutat\u00f3i \u00e1ltal jelentett SAD DNS t\u00e1mad\u00e1sokra. A SAD DNS \u00e9s a DNSpooq sebezhet\u0151s\u00e9gek egy\u00fcttesen is alkalmazhat\u00f3k a t\u00e1mad\u00e1sok megk\u00f6nny\u00edt\u00e9se \u00e9rdek\u00e9ben. Tov\u00e1bbi, tiszt\u00e1zatlan k\u00f6vetkezm\u00e9nyekkel j\u00e1r\u00f3 t\u00e1mad\u00e1sokr\u00f3l is besz\u00e1moltak az egyetemek k\u00f6z\u00f6s er\u0151fesz\u00edt\u00e9seivel (Poison Over Troubled Forwarders stb.).
\nA sebezhet\u0151s\u00e9gek az entr\u00f3pia cs\u00f6kkent\u00e9s\u00e9n kereszt\u00fcl m\u0171k\u00f6dnek. A DNS-k\u00e9r\u00e9sek azonos\u00edt\u00e1s\u00e1hoz haszn\u00e1lt gyenge hash \u00e9s a k\u00e9r\u00e9s-v\u00e1lasz eml\u00e9kezetbe illeszt\u00e9s\u00e9nek hi\u00e1nya miatt az entr\u00f3pia jelent\u0151sen cs\u00f6kkenthet\u0151, \u00e9s csak ~19 bitet kell kital\u00e1lni, ami lehet\u0151v\u00e9 teszi a k\u00e9szlet m\u00e9rgez\u00e9s\u00e9t. A dnsmasq CNAME rekordok feldolgoz\u00e1si m\u00f3dja lehet\u0151v\u00e9 teszi a CNAME rekordl\u00e1nc hamis\u00edt\u00e1s\u00e1t, \u00e9s hat\u00e9konyan teszi lehet\u0151v\u00e9 ak\u00e1r 9 DNS-rekord egyidej\u0171 m\u00e9rgez\u00e9s\u00e9t.<\/p>\n

Buffer overflow vulnerabilities: CVE-2020-25687, CVE-2020-25683, CVE-2020-25682, CVE-2020-25681. All four identified vulnerabilities are present in the code implementing DNSSEC and only manifest when DNSSEC validation is enabled in the settings.<\/p>\n

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

\u0421\u043f\u0435\u0446\u0438\u0430\u043b\u0438\u0441\u0442\u044b \u0438\u0437 JSOF research labs \u0441\u043e\u043e\u0431\u0449\u0438\u043b\u0438 \u043e \u0441\u0435\u043c\u0438 \u043d\u043e\u0432\u044b\u0445 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044f\u0445 \u0432 DNS\/DHCP \u0441\u0435\u0440\u0432\u0435\u0440\u0435 dnsmasq. \u0421\u0435\u0440\u0432\u0435\u0440 dnsmasq \u0432\u0435\u0441\u044c\u043c\u0430 \u043f\u043e\u043f\u0443\u043b\u044f\u0440\u0435\u043d \u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442\u0441\u044f \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u0432\u043e \u043c\u043d\u043e\u0433\u0438\u0445 \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u0430\u0445 linux, \u0430 \u0442\u0430\u043a\u0436\u0435 \u0432 \u0441\u0435\u0442\u0435\u0432\u043e\u043c \u043e\u0431\u043e\u0440\u0443\u0434\u043e\u0432\u0430\u043d\u0438\u0438 Cisco, Ubiquiti \u0438 \u043f\u0440\u043e\u0447\u0438\u0445. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 Dnspooq \u0432\u043a\u043b\u044e\u0447\u0430\u044e\u0442 \u0432 \u0441\u0435\u0431\u044f \u043e\u0442\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 DNS-\u043a\u044d\u0448\u0430, \u0430 \u0442\u0430\u043a\u0436\u0435 \u0443\u0434\u0430\u043b\u0435\u043d\u043d\u043e\u0435 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u043a\u043e\u0434\u0430. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u044b \u0432 dnsmasq 2.83. \u0412 2008 \u0433\u043e\u0434\u0443 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-98911","post","type-post","status-publish","format-standard","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\udd47DNSpooq \u2014 seven new vulnerabilities in dnsmasq | ProHoster","description":"Experts from JSOF research labs reported seven new vulnerabilities in the DNS\/DHCP server 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