{"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\/fr\/blog\/news\/uyazvimost-v-dns-servere-bind-ne-isklyuchayushhaya-udalyonnoe-vypolnenie-koda","title":{"rendered":"Vuln\u00e9rabilit\u00e9 dans le serveur DNS BIND, n'excluant pas l'ex\u00e9cution de code \u00e0 distance","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Des mises \u00e0 jour correctives ont \u00e9t\u00e9 publi\u00e9es pour les branches stables des serveurs DNS BIND 9.11.28 et 9.16.12, ainsi que pour la branche exp\u00e9rimentale en cours de d\u00e9veloppement 9.17.10. Les nouvelles versions corrigent une vuln\u00e9rabilit\u00e9 (CVE-2020-8625) entra\u00eenant un d\u00e9bordement de tampon et pouvant potentiellement permettre l'ex\u00e9cution \u00e0 distance de code par un attaquant. Aucun exploit fonctionnel n'a encore \u00e9t\u00e9 d\u00e9tect\u00e9. <\/p>\n

Le probl\u00e8me est caus\u00e9 par une erreur dans la mise en \u0153uvre du m\u00e9canisme SPNEGO (Simple and Protected GSSAPI Negotiation Mechanism), utilis\u00e9 dans GSSAPI pour n\u00e9gocier les protocoles utilis\u00e9s par le client et serveur<\/a> les m\u00e9thodes de protection. GSSAPI est utilis\u00e9 comme protocole de haut niveau pour un \u00e9change s\u00e9curis\u00e9 de cl\u00e9s via l'extension GSS-TSIG, qui est utilis\u00e9e lors du processus d'authentification des mises \u00e0 jour dynamiques des zones DNS. <\/p>\n

La vuln\u00e9rabilit\u00e9 concerne les syst\u00e8mes pour lesquels l'utilisation de GSS-TSIG est activ\u00e9e (par exemple, si les options tkey-gssapi-keytab et tkey-gssapi-credential sont utilis\u00e9es). GSS-TSIG est g\u00e9n\u00e9ralement appliqu\u00e9 dans des environnements mixtes, o\u00f9 BIND est associ\u00e9 \u00e0 des contr\u00f4leurs de domaine<\/a> Active Directory ou dans le cadre d'une int\u00e9gration avec Samba. Dans la configuration par d\u00e9faut, GSS-TSIG est d\u00e9sactiv\u00e9. <\/p>\n

Une solution de contournement pour le blocage du probl\u00e8me, sans avoir besoin de d\u00e9sactiver GSS-TSIG, consiste \u00e0 assembler BIND sans le support du m\u00e9canisme SPNEGO, que l'on peut d\u00e9sactiver en sp\u00e9cifiant lors de l'ex\u00e9cution du script \u00ab configure \u00bb l'option \u00ab --disable-isc-spnego \u00bb. Dans les distributions, le probl\u00e8me reste actuellement non r\u00e9solu. Vous pouvez suivre l'apparition des mises \u00e0 jour sur les pages suivantes : Debian, RHEL, SUSE, Ubuntu, Fedora, Arch Linux, FreeBSD, NetBSD.
\n
Source : opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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