{"id":105611,"date":"2022-11-17T15:36:54","date_gmt":"2022-11-17T13:36:54","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-samba-i-mit-heimdal-kerberos-privodyashhaya-k-perepolneniyu-bufera"},"modified":"2022-11-17T15:36:54","modified_gmt":"2022-11-17T13:36:54","slug":"uyazvimost-v-samba-i-mit-heimdal-kerberos-privodyashhaya-k-perepolneniyu-bufera","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/uyazvimost-v-samba-i-mit-heimdal-kerberos-privodyashhaya-k-perepolneniyu-bufera","title":{"rendered":"Zranitelnost v Samb\u011b a MIT\/Heimdal Kerberos, kter\u00e1 zp\u016fsobuje p\u0159ete\u010den\u00ed bufferu","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Byly zve\u0159ejn\u011bny opravy pro bal\u00ed\u010dky Samba 4.17.3, 4.16.7 a 4.15.12, kter\u00e9 \u0159e\u0161\u00ed zranitelnost (CVE-2022-42898) v knihovn\u00e1ch Kerberos, vedouc\u00ed k p\u0159ete\u010den\u00ed cel\u00e9ho \u010d\u00edsla a z\u00e1pisu dat mimo vyhrazen\u00fd vyrovn\u00e1vac\u00ed pam\u011b\u0165 p\u0159i zpracov\u00e1n\u00ed parametr\u016f PAC (Privileged Attribute Certificate) odeslan\u00fdch autentizovan\u00fdm u\u017eivatelem. Publikaci aktualizac\u00ed bal\u00ed\u010dk\u016f v distribuc\u00edch lze sledovat na str\u00e1nk\u00e1ch: Debian, Ubuntu, Gentoo, RHEL, SUSE, Arch, FreeBSD. <\/p>\n

Krom\u011b Samby se probl\u00e9m tak\u00e9 projevuje v bal\u00ed\u010dc\u00edch s MIT Kerberos a Heimdal Kerberos. V zpr\u00e1v\u011b o zranitelnosti od projektu Samba hrozba nen\u00ed podrobn\u011b pops\u00e1na, ale ve zpr\u00e1v\u011b MIT Kerberos se uv\u00e1d\u00ed, \u017ee zranitelnost m\u016f\u017ee v\u00e9st k vzd\u00e1len\u00e9mu spu\u0161t\u011bn\u00ed k\u00f3du. Zneu\u017eit\u00ed zranitelnosti je mo\u017en\u00e9 pouze na 32bitov\u00fdch syst\u00e9mech. <\/p>\n

Probl\u00e9m se t\u00fdk\u00e1 konfigurac\u00ed s KDC (Key Distribution Center) nebo kadmind. V konfigurac\u00edch bez Active Directory se zranitelnost tak\u00e9 projevuje na souborov\u00fdch serverech<\/a> Samb\u00e1ch vyu\u017e\u00edvaj\u00edc\u00edch Kerberos. Probl\u00e9m je zp\u016fsoben chybou ve funkci krb5_parse_pac(), kter\u00e1 nespr\u00e1vn\u011b vypo\u010d\u00edt\u00e1vala velikost vyrovn\u00e1vac\u00ed pam\u011bti pou\u017e\u00edvan\u00e9 p\u0159i anal\u00fdze pol\u00ed PAC. Na 32bitov\u00fdch syst\u00e9mech p\u0159i zpracov\u00e1n\u00ed speci\u00e1ln\u011b upraven\u00fdch PAC mohla chyba v\u00e9st k um\u00edst\u011bn\u00ed \u00fato\u010dn\u00edkem zaslan\u00e9ho 16bajtov\u00e9ho bloku mimo vyhrazenou vyrovn\u00e1vac\u00ed pam\u011b\u0165.
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\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 \u0432\u044b\u043f\u0443\u0441\u043a\u0438 \u043f\u0430\u043a\u0435\u0442\u0430 Samba 4.17.3, 4.16.7 \u0438 4.15.12 \u0441 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435\u043c \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (CVE-2022-42898) \u0432 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430\u0445 Kerberos, \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0435\u0439 \u043a \u0446\u0435\u043b\u043e\u0447\u0438\u0441\u043b\u0435\u043d\u043d\u043e\u043c\u0443 \u043f\u0435\u0440\u0435\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044e \u0438 \u0437\u0430\u043f\u0438\u0441\u0438 \u0434\u0430\u043d\u043d\u044b\u0445 \u0437\u0430 \u043f\u0440\u0435\u0434\u0435\u043b\u044b \u0432\u044b\u0434\u0435\u043b\u0435\u043d\u043d\u043e\u0433\u043e \u0431\u0443\u0444\u0435\u0440\u0430 \u043f\u0440\u0438 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0435 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u043e\u0432 PAC (Privileged Attribute Certificate), \u043e\u0442\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u043d\u044b\u0445 \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u0446\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u043c \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u043c. \u041f\u0443\u0431\u043b\u0438\u043a\u0430\u0446\u0438\u044e \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0439 \u043f\u0430\u043a\u0435\u0442\u043e\u0432 \u0432 \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u0430\u0445 \u043c\u043e\u0436\u043d\u043e \u043f\u0440\u043e\u0441\u043b\u0435\u0434\u0438\u0442\u044c \u043d\u0430 \u0441\u0442\u0440\u0430\u043d\u0438\u0446\u0430\u0445: Debian, Ubuntu, Gentoo, RHEL, SUSE, Arch, FreeBSD. \u041a\u0440\u043e\u043c\u0435 Samba […]<\/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-105611","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\udd47Zranitelnost v Samb\u011b a MIT\/Heimdal Kerberos, vedouc\u00ed k p\u0159ete\u010den\u00ed vyrovn\u00e1vac\u00ed pam\u011bti | ProHoster","description":"Byly zve\u0159ejn\u011bny opravy pro bal\u00ed\u010dky Samba 4.17.3, 4.16.7 a 4.15.12, kter\u00e9 \u0159e\u0161\u00ed zranitelnost (CVE-2022-42898) v knihovn\u00e1ch Kerberos, vedouc\u00ed k p\u0159ete\u010den\u00ed cel\u00e9ho \u010d\u00edsla a z\u00e1pisu dat 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\u043f\u0440\u0435\u0434\u0435\u043b\u044b.","og:url":"https:\/\/prohoster.info\/cs\/blog\/news\/uyazvimost-v-samba-i-mit-heimdal-kerberos-privodyashhaya-k-perepolneniyu-bufera","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2022-11-17T13:36:54+00:00","article:modified_time":"2022-11-17T13:36:54+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":[],"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts\/105611","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/comments?post=105611"}],"version-history":[{"count":1,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts\/105611\/revisions"}],"predecessor-version":[{"id":164425,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts\/105611\/revisions\/164425"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/media?parent=105611"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/categories?post=105611"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/tags?post=105611"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}