{"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\/pl\/blog\/news\/obnovlenie-dns-servera-bind-c-ustraneniem-uyazvimosti-dopuskayushhej-udalyonnoe-vypolnenie-koda","title":{"rendered":"Aktualizacja serwera DNS BIND z poprawk\u0105 luki, umo\u017cliwiaj\u0105c\u0105 zdalne wykonanie kodu","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Opublikowane zosta\u0142y poprawki dla stabilnych wersji serwera DNS BIND 9.11.31 i 9.16.15, a tak\u017ce dla eksperymentalnej wersji 9.17.12, kt\u00f3ra jest w fazie rozwoju. W nowych wydaniach usuni\u0119to trzy luki bezpiecze\u0144stwa, z kt\u00f3rych jedna (CVE-2021-25216) prowadzi do przepe\u0142nienia bufora. W 32-bitowych systemach luka mo\u017ce by\u0107 wykorzystywana do zdalnego wykonywania kodu przez napastnika poprzez wys\u0142anie odpowiednio sformu\u0142owanego \u017c\u0105dania GSS-TSIG. W systemach 64-bitowych problem ogranicza si\u0119 do awarii procesu named.      <\/p>\n<p>Problem wyst\u0119puje tylko przy w\u0142\u0105czonym mechanizmie GSS-TSIG, aktywowanym za pomoc\u0105 ustawie\u0144 tkey-gssapi-keytab i tkey-gssapi-credential. GSS-TSIG jest domy\u015blnie wy\u0142\u0105czony w konfiguracji i zazwyczaj stosuje si\u0119 go w mieszanych \u015brodowiskach, w kt\u00f3rych BIND jest \u0142\u0105czony z kontrolerami domen Active Directory lub podczas integracji z Samb\u0105.       <\/p>\n<p>Luka bezpiecze\u0144stwa jest spowodowana b\u0142\u0119dem w implementacji mechanizmu SPNEGO (Simple and Protected GSSAPI Negotiation Mechanism), kt\u00f3ry jest u\u017cywany w GSSAPI do negocjowania u\u017cywanych metod przez klienta i <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/pl\/server\/dts-prohoster\/\"   title=\"serwerem\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3007\">serwerem<\/a> metod ochrony. GSSAPI s\u0142u\u017cy jako protok\u00f3\u0142 wysokiego poziomu do bezpiecznej wymiany kluczy za pomoc\u0105 rozszerzenia GSS-TSIG, stosowanego w procesie uwierzytelniania dynamicznych aktualizacji stref DNS.         <\/p>\n<p>Poniewa\u017c wcze\u015bniej odkrywano krytyczne luki w wbudowanej implementacji SPNEGO, ta implementacja zosta\u0142a usuni\u0119ta z bazy kodu BIND 9. U\u017cytkownikom, kt\u00f3rzy potrzebuj\u0105 wsparcia dla SPNEGO, zaleca si\u0119 korzystanie z zewn\u0119trznej implementacji udost\u0119pnianej przez systemow\u0105 bibliotek\u0119 GSSAPI (dost\u0119pn\u0105 w MIT Kerberos i 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>Dodatkowo w omawianych aktualizacjach BIND usuni\u0119to jeszcze dwie luki bezpiecze\u0144stwa:  <\/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\/pl\/server\/\"   title=\"serwer\u00f3w\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"1576\">serwer\u00f3w<\/a> problemowy rekord mo\u017cna uzyska\u0107 po zapytaniu do serwera autorytatywnego.\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>\u0179r\u00f3d\u0142o: <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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