{"id":100059,"date":"2021-04-29T10:22:42","date_gmt":"2021-04-29T08:22:42","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/obnovlenie-dns-servera-bind-c-ustraneniem-uyazvimosti-dopuskayushhej-udalyonnoe-vypolnenie-koda"},"modified":"2021-04-29T10:22:42","modified_gmt":"2021-04-29T08:22:42","slug":"obnovlenie-dns-servera-bind-c-ustraneniem-uyazvimosti-dopuskayushhej-udalyonnoe-vypolnenie-koda","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/news\/obnovlenie-dns-servera-bind-c-ustraneniem-uyazvimosti-dopuskayushhej-udalyonnoe-vypolnenie-koda","title":{"rendered":"Aggiornamento del server DNS BIND per la correzione di una vulnerabilit\u00e0 che consente l'esecuzione remota di codice.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Sono stati pubblicati aggiornamenti correttivi per i rami stabili del server DNS BIND 9.11.31 e 9.16.15, nonch\u00e9 per il ramo sperimentale in fase di sviluppo 9.17.12. Le nuove versioni risolvono tre vulnerabilit\u00e0, una delle quali (CVE-2021-25216) porta a un overflow del buffer. Su sistemi a 32 bit, la vulnerabilit\u00e0 pu\u00f2 essere sfruttata per l'esecuzione remota di codice da parte di un aggressore inviando una richiesta GSS-TSIG appositamente formattata. Su sistemi a 64 bit, il problema \u00e8 limitato al crash del processo named.      <\/p>\n<p>Il problema si manifesta solo con l'attivazione del meccanismo GSS-TSIG, attivato tramite le impostazioni tkey-gssapi-keytab e tkey-gssapi-credential. GSS-TSIG \u00e8 disabilitato nella configurazione predefinita ed \u00e8 generalmente utilizzato in ambienti misti, in cui BIND viene combinato con controller di dominio Active Directory o durante l'integrazione con Samba.       <\/p>\n<p>La vulnerabilit\u00e0 \u00e8 causata da un errore nell'implementazione del meccanismo SPNEGO (Simple and Protected GSSAPI Negotiation Mechanism), utilizzato in GSSAPI per la negoziazione del protocollo client e <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/it\/server\/dts-prohoster\/\"   title=\"server\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3007\">server<\/a> metodi di protezione. GSSAPI viene utilizzato come protocollo di alto livello per lo scambio sicuro di chiavi tramite l'estensione GSS-TSIG, utilizzata nel processo di autenticazione degli aggiornamenti dinamici delle zone DNS.         <\/p>\n<p>Poich\u00e9 in passato sono state trovate vulnerabilit\u00e0 critiche nell'implementazione integrata di SPNEGO, l'implementazione di questo protocollo \u00e8 stata rimossa dalla base di codice di BIND 9. Per gli utenti che necessitano del supporto SPNEGO, si consiglia di utilizzare un'implementazione esterna fornita dalla libreria di sistema GSSAPI (disponibile in MIT Kerberos e Heimdal Kerberos).     <\/p>\n<p>\u041f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0441\u0442\u0430\u0440\u044b\u0445 \u0432\u0435\u0440\u0441\u0438\u0439 BIND \u0432 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u043e\u0431\u0445\u043e\u0434\u043d\u043e\u0433\u043e \u043f\u0443\u0442\u0438 \u0431\u043b\u043e\u043a\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b, \u043c\u043e\u0433\u0443\u0442 \u043e\u0442\u043a\u043b\u044e\u0447\u0438\u0442\u044c GSS-TSIG \u0432 \u043d\u0430\u0441\u0442\u0440\u043e\u0439\u043a\u0430\u0445  (\u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u044b tkey-gssapi-keytab \u0438 tkey-gssapi-credential) \u0438\u043b\u0438 \u043f\u0435\u0440\u0435\u0441\u0431\u043e\u0440\u0430\u0442\u044c BIND \u0431\u0435\u0437 \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0438 \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c\u0430 SPNEGO (\u043e\u043f\u0446\u0438\u044f &#171;&#8212;disable-isc-spnego&#187; \u0432 \u0441\u043a\u0440\u0438\u043f\u0442\u0435 &#171;configure&#187;). \u041f\u0440\u043e\u0441\u043b\u0435\u0434\u0438\u0442\u044c \u0437\u0430 \u043f\u043e\u044f\u0432\u043b\u0435\u043d\u0438\u0435\u043c \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0439 \u0432 \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u0430\u0445 \u043c\u043e\u0436\u043d\u043e \u043d\u0430 \u0441\u0442\u0440\u0430\u043d\u0438\u0446\u0430\u0445: Debian, SUSE, Ubuntu, Fedora, Arch Linux, FreeBSD, NetBSD. \u041f\u0430\u043a\u0435\u0442\u044b RHEL  \u0438 ALT Linux \u0441\u043e\u0431\u0438\u0440\u0430\u044e\u0442\u0441\u044f \u0431\u0435\u0437 \u0432\u0441\u0442\u0440\u043e\u0435\u043d\u043d\u043e\u0439 \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0438 SPNEGO.              <\/p>\n<p>In aggiunta, negli aggiornamenti considerati, BIND ha risolto altre due vulnerabilit\u00e0:  <\/p>\n<ul>\n<li class=\"l\"> CVE-2021-25215 &#8212; \u043a\u0440\u0430\u0445 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0430 named \u043f\u0440\u0438 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0435 \u0437\u0430\u043f\u0438\u0441\u0435\u0439 DNAME (\u0440\u0435\u0434\u0438\u0440\u0435\u043a\u0442 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u0447\u0430\u0441\u0442\u0438 \u043f\u043e\u0434\u0434\u043e\u043c\u0435\u043d\u043e\u0432), \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0438\u0445 \u043a \u0434\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u0438\u044e \u0432 \u0441\u0435\u043a\u0446\u0438\u044e ANSWER \u0434\u0443\u0431\u043b\u0438\u043a\u0430\u0442\u043e\u0432.  \u0414\u043b\u044f \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043d\u0430 \u0430\u0432\u0442\u043e\u0440\u0438\u0442\u0435\u0442\u043d\u044b\u0445 DNS-\u0441\u0435\u0440\u0432\u0435\u0440\u0430\u0445  \u0442\u0440\u0435\u0431\u0443\u0435\u0442\u0441\u044f \u0432\u043d\u0435\u0441\u0435\u043d\u0438\u0435 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u0439 \u0432 \u043e\u0431\u0440\u0430\u0431\u0430\u0442\u044b\u0432\u0430\u0435\u043c\u044b\u0435 DNS-\u0437\u043e\u043d\u044b, \u0430 \u0434\u043b\u044f \u0440\u0435\u043a\u0443\u0440\u0441\u0438\u0432\u043d\u044b\u0445 <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/it\/server\/\"   title=\"server\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"1576\">server<\/a> il record problematico pu\u00f2 essere ottenuto dopo aver contattato un server autorevole.\n<li class=\"l\"> CVE-2021-25214 &#8212; \u043a\u0440\u0430\u0445 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0430 named \u043f\u0440\u0438 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0435 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u043e\u0433\u043e \u0432\u0445\u043e\u0434\u044f\u0449\u0435\u0433\u043e \u0437\u0430\u043f\u0440\u043e\u0441\u0430  IXFR (\u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442\u0441\u044f \u0434\u043b\u044f \u0438\u043d\u043a\u0440\u0435\u043c\u0435\u043d\u0442\u0430\u043b\u044c\u043d\u043e\u0439 \u043f\u0435\u0440\u0435\u0434\u0430\u0447\u0438 \u043c\u0435\u0436\u0434\u0443 DNS-\u0441\u0435\u0440\u0432\u0435\u0440\u0430\u043c\u0438 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u0439 \u0432 \u0437\u043e\u043d\u0430\u0445 DNS).   \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0435 \u043f\u043e\u0434\u0432\u0435\u0440\u0436\u0435\u043d\u044b \u0442\u043e\u043b\u044c\u043a\u043e \u0441\u0438\u0441\u0442\u0435\u043c\u044b, \u0440\u0430\u0437\u0440\u0435\u0448\u0438\u0432\u0448\u0438\u0435 \u043f\u0435\u0440\u0435\u0434\u0430\u0447\u0443 \u0437\u043e\u043d DNS \u0441 \u0441\u0435\u0440\u0432\u0435\u0440\u0430 \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0435\u0433\u043e (\u043e\u0431\u044b\u0447\u043d\u043e \u043f\u0435\u0440\u0435\u0434\u0430\u0447\u0430 \u0437\u043e\u043d \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442\u0441\u044f \u0434\u043b\u044f \u0441\u0438\u043d\u0445\u0440\u043e\u043d\u0438\u0437\u0430\u0446\u0438\u0438 master- \u0438 slave-\u0441\u0435\u0440\u0432\u0435\u0440\u043e\u0432 \u0438 \u0432\u044b\u0431\u043e\u0440\u043e\u0447\u043d\u043e \u0440\u0430\u0437\u0440\u0435\u0448\u0430\u0435\u0442\u0441\u044f \u0442\u043e\u043b\u044c\u043a\u043e \u0434\u043b\u044f \u0437\u0430\u0441\u043b\u0443\u0436\u0438\u0432\u0430\u044e\u0449\u0438\u0445 \u0434\u043e\u0432\u0435\u0440\u0438\u0435 \u0441\u0435\u0440\u0432\u0435\u0440\u043e\u0432). \u0412 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u043e\u0431\u0445\u043e\u0434\u043d\u043e\u0433\u043e \u043f\u0443\u0442\u0438 \u0437\u0430\u0449\u0438\u0442\u044b \u043c\u043e\u0436\u043d\u043e \u043e\u0442\u043a\u043b\u044e\u0447\u0438\u0442\u044c \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0443 IXFR  \u043f\u0440\u0438 \u043f\u043e\u043c\u043e\u0449\u0438 \u043d\u0430\u0441\u0442\u0440\u043e\u0439\u043a\u0438 &#171;request-ixfr no;&#187;.    <\/ul>\n<p>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=55042\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u044b \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0435 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f \u0441\u0442\u0430\u0431\u0438\u043b\u044c\u043d\u044b\u0445 \u0432\u0435\u0442\u043e\u043a DNS-\u0441\u0435\u0440\u0432\u0435\u0440\u0430 BIND 9.11.31 \u0438 9.16.15, \u0430 \u0442\u0430\u043a\u0436\u0435 \u043d\u0430\u0445\u043e\u0434\u044f\u0449\u0435\u0439\u0441\u044f \u0432 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0435 \u044d\u043a\u0441\u043f\u0435\u0440\u0438\u043c\u0435\u043d\u0442\u0430\u043b\u044c\u043d\u043e\u0439 \u0432\u0435\u0442\u043a\u0438 9.17.12. \u0412 \u043d\u043e\u0432\u044b\u0445 \u0432\u044b\u043f\u0443\u0441\u043a\u0430\u0445 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u044b \u0442\u0440\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438, \u043e\u0434\u043d\u0430 \u0438\u0437 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 (CVE-2021-25216) \u043f\u0440\u0438\u0432\u043e\u0434\u0438\u0442 \u043a \u043f\u0435\u0440\u0435\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044e \u0431\u0443\u0444\u0435\u0440\u0430. \u041d\u0430 32-\u0440\u0430\u0437\u0440\u044f\u0434\u043d\u044b\u0445 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0430 \u0434\u043b\u044f \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u0433\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043a\u043e\u0434\u0430 \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a\u0430 \u0447\u0435\u0440\u0435\u0437 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0443 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u043e\u0433\u043e \u0437\u0430\u043f\u0440\u043e\u0441\u0430 GSS-TSIG. \u041d\u0430 64-\u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0438\u0432\u0430\u0435\u0442\u0441\u044f \u043a\u0440\u0430\u0445\u043e\u043c [&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":[702],"tags":[],"class_list":["post-100059","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u044b \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0435 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f \u0441\u0442\u0430\u0431\u0438\u043b\u044c\u043d\u044b\u0445 \u0432\u0435\u0442\u043e\u043a DNS-\u0441\u0435\u0440\u0432\u0435\u0440\u0430 BIND 9.11.31 \u0438 9.16.15, \u0430 \u0442\u0430\u043a\u0436\u0435 \u043d\u0430\u0445\u043e\u0434\u044f\u0449\u0435\u0439\u0441\u044f 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\u0441\u0435\u0440\u0432\u0435\u0440\u044b\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"\ud83e\udd47\u041e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0435 DNS-\u0441\u0435\u0440\u0432\u0435\u0440\u0430 BIND c \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435\u043c \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438, \u0434\u043e\u043f\u0443\u0441\u043a\u0430\u044e\u0449\u0435\u0439 \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u0435 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u043a\u043e\u0434\u0430 | ProHoster\" \/>\n\t\t<meta property=\"og:description\" content=\"\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u044b \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0435 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f \u0441\u0442\u0430\u0431\u0438\u043b\u044c\u043d\u044b\u0445 \u0432\u0435\u0442\u043e\u043a 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