{"id":99192,"date":"2021-02-18T10:23:05","date_gmt":"2021-02-18T08:23:05","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-dns-servere-bind-ne-isklyuchayushhaya-udalyonnoe-vypolnenie-koda"},"modified":"2021-02-18T10:23:05","modified_gmt":"2021-02-18T08:23:05","slug":"uyazvimost-v-dns-servere-bind-ne-isklyuchayushhaya-udalyonnoe-vypolnenie-koda","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/uyazvimost-v-dns-servere-bind-ne-isklyuchayushhaya-udalyonnoe-vypolnenie-koda","title":{"rendered":"A BIND DNS-kiszolg\u00e1l\u00f3 sebezhet\u0151s\u00e9ge, amely lehet\u0151v\u00e9 teszi a t\u00e1voli k\u00f3dv\u00e9grehajt\u00e1st","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Megjelentek a BIND DNS-szerver 9.11.28 \u00e9s 9.16.12 stabil \u00e1gainak, valamint a fejleszt\u00e9s alatt \u00e1ll\u00f3 k\u00eds\u00e9rleti 9.17.10 \u00e1gnak a hibajav\u00edt\u00f3 friss\u00edt\u00e9sei. Az \u00faj verzi\u00f3k orvosolj\u00e1k a (CVE-2020-8625) sebezhet\u0151s\u00e9get, amely puffert\u00falcsordul\u00e1st okozhat, \u00e9s potenci\u00e1lisan t\u00e1voli k\u00f3dv\u00e9grehajt\u00e1st eredm\u00e9nyezhet a t\u00e1mad\u00f3 r\u00e9sz\u00e9r\u0151l. M\u00e9g nem tal\u00e1ltak bizony\u00edt\u00e9kokat m\u0171k\u00f6d\u0151 exploitokra. <\/p>\n

A probl\u00e9ma egy hiba miatt l\u00e9pett fel a SPNEGO (Simple and Protected GSSAPI Negotiation Mechanism) mechanizmus megval\u00f3s\u00edt\u00e1s\u00e1ban, amelyet a GSSAPI alkalmaz az \u00fcgyf\u00e9l \u00e1ltal haszn\u00e1lt \u00e9s szerverrel<\/a> Az GSSAPI egy magas szint\u0171 protokoll, amely a GSS-TSIG kiterjeszt\u00e9s\u00e9vel kulcsok v\u00e9dett cser\u00e9j\u00e9re szolg\u00e1l, amelyet a DNS z\u00f3n\u00e1k dinamikus friss\u00edt\u00e9seinek hiteles\u00edt\u00e9s\u00e9n\u00e9l alkalmaznak. <\/p>\n

A sebezhet\u0151s\u00e9g \u00e9rinti azokat a rendszereket, ahol enged\u00e9lyezve van a GSS-TSIG haszn\u00e1lata (p\u00e9ld\u00e1ul ha a tkey-gssapi-keytab \u00e9s a tkey-gssapi-credential be\u00e1ll\u00edt\u00e1sok vannak haszn\u00e1latban). A GSS-TSIG \u00e1ltal\u00e1ban vegyes k\u00f6rnyezetekben haszn\u00e1latos, ahol a BIND Active Directory vez\u00e9rl\u0151kkel, vagy Samba integr\u00e1ci\u00f3val domain<\/a> dolgozik. Az alap\u00e9rtelmezett konfigur\u00e1ci\u00f3ban a GSS-TSIG ki van kapcsolva. <\/p>\n

A blokkol\u00e1si probl\u00e9ma megker\u00fcl\u00e9s\u00e9nek alternat\u00edv\u00e1ja, amely nem ig\u00e9nyli a GSS-TSIG letilt\u00e1s\u00e1t, a BIND olyan verzi\u00f3ja, amely nem t\u00e1mogatja az SPNEGO mechanizmust, \u00e9s amely letilthat\u00f3 a «configure» szkript futtat\u00e1sakor az «—disable-isc-spnego» opci\u00f3 megad\u00e1s\u00e1val. A disztrib\u00faci\u00f3kban a probl\u00e9ma jelenleg m\u00e9g nem jav\u00edtott. Az aktualiz\u00e1l\u00e1sok nyomon k\u00f6vet\u00e9s\u00e9re a k\u00f6vetkez\u0151 oldalakat lehet felkeresni: Debian, RHEL, SUSE, Ubuntu, Fedora, Arch Linux, FreeBSD, NetBSD.
\n
Forr\u00e1s: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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\u043f\u0435\u0440\u0435\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044e \u0431\u0443\u0444\u0435\u0440\u0430 \u0438 \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u0441\u043f\u043e\u0441\u043e\u0431\u043d\u0430\u044f \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u043c\u0443 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044e \u043a\u043e\u0434\u0430 \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a\u0430. \u0421\u043b\u0435\u0434\u043e\u0432 \u043d\u0430\u043b\u0438\u0447\u0438\u044f \u0440\u0430\u0431\u043e\u0447\u0438\u0445 \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u043e\u0432 \u043f\u043e\u043a\u0430 \u043d\u0435 \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u043e. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u043e\u0448\u0438\u0431\u043a\u043e\u0439 \u0432 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