{"id":102262,"date":"2021-11-10T21:36:39","date_gmt":"2021-11-10T19:36:39","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/v-samba-ustraneno-8-opasnyh-uyazvimostej"},"modified":"2021-11-10T21:36:39","modified_gmt":"2021-11-10T19:36:39","slug":"v-samba-ustraneno-8-opasnyh-uyazvimostej","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pl\/blog\/news\/v-samba-ustraneno-8-opasnyh-uyazvimostej","title":{"rendered":"W Samba usuni\u0119to 8 gro\u017anych luk bezpiecze\u0144stwa","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Opublikowane zosta\u0142y poprawki dla pakietu Samba 4.15.2, 4.14.10 i 4.13.14, kt\u00f3re eliminuj\u0105 8 luk w zabezpieczeniach, z kt\u00f3rych wi\u0119kszo\u015b\u0107 mo\u017ce prowadzi\u0107 do ca\u0142kowitej kompromitacji domeny Active Directory. Warto zauwa\u017cy\u0107, \u017ce jeden z problem\u00f3w rozwi\u0105zywano od 2016 roku, a pi\u0119\u0107 \u2014 od 2020 roku, niemniej jednak jedna poprawka spowodowa\u0142a uniemo\u017cliwienie uruchomienia winbindd przy ustawieniu \u201eallow trusted domains = no\u201d (deweloperzy planuj\u0105 szybko opublikowa\u0107 kolejn\u0105 aktualizacj\u0119 z poprawk\u0105). Mo\u017cna \u015bledzi\u0107 wydania aktualizacji pakiet\u00f3w w dystrybucjach na stronach: Debian, Ubuntu, RHEL, SUSE, Fedora, Arch, FreeBSD.    <\/p>\n<p>Usuni\u0119te podatno\u015bci:  <\/p>\n<ul>\n<li class=\"l\"> CVE-2020-25717 \u2014 z powodu niedoci\u0105gni\u0119cia w logice mapowania u\u017cytkownik\u00f3w domeny na u\u017cytkownik\u00f3w lokalnego systemu, u\u017cytkownik domeny Active Directory, maj\u0105cy mo\u017cliwo\u015b\u0107 tworzenia nowych kont na swoim systemie, zarz\u0105dzanych przez ms-DS-MachineAccountQuota, m\u00f3g\u0142 uzyska\u0107 dost\u0119p z uprawnieniami root do innych system\u00f3w nale\u017c\u0105cych do <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/pl\/domain\/\"   title=\"domen\u0119\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"4094\">domen\u0119<\/a>.\n<li class=\"l\"> CVE-2021-3738 \u2014 dost\u0119p do ju\u017c zwolnionej pami\u0119ci (Use after free) w implementacji serwera RPC Samba AD DC (dsdb), co potencjalnie mo\u017ce prowadzi\u0107 do podniesienia uprawnie\u0144 przy manipulacji nawi\u0105zywaniem po\u0142\u0105cze\u0144.\n<li class=\"l\"> CVE-2016-2124 \u2014 po\u0142\u0105czenia klienckie ustanowione z u\u017cyciem protoko\u0142u SMB1 mog\u0142y by\u0107 przekszta\u0142cane w przesy\u0142anie parametr\u00f3w uwierzytelniaj\u0105cych w postaci otwartego tekstu lub przez NTLM (na przyk\u0142ad w celu okre\u015blenia danych uwierzytelniaj\u0105cych podczas atak\u00f3w MITM), nawet je\u015bli dla u\u017cytkownika lub aplikacji w ustawieniach okre\u015blono obligatoryjne uwierzytelnienie przez Kerberos.\n<li class=\"l\"> CVE-2020-25722 \u2014 w kontrolerze domeny Active Directory opartym na Samba nie wykonywano odpowiednich kontroli dost\u0119pu do przechowywanych danych, co pozwala\u0142o dowolnemu u\u017cytkownikowi omija\u0107 kontrole uprawnie\u0144 i ca\u0142kowicie kompromitowa\u0107 domen\u0119.\n<li class=\"l\"> CVE-2020-25718 \u2014 w kontrolerze domeny Active Directory opartym na Samba nieprawid\u0142owo izolowane by\u0142y bilety Kerberos wydawane przez RODC (Read-only domain controller), co mog\u0142o by\u0107 wykorzystywane do uzyskiwania bilet\u00f3w administratora z RODC bez odpowiednich uprawnie\u0144.\n<li class=\"l\"> CVE-2020-25719 \u2014 kontroler domeny Active Directory oparty na Sambie nie zawsze uwzgl\u0119dnia\u0142 w powi\u0105zaniu pola SID i PAC w biletach Kerberos (przy ustawieniu \u201egensec:require_pac = true\u201d sprawdzano tylko nazw\u0119, a PAC nie by\u0142 brany pod uwag\u0119), co pozwala\u0142o u\u017cytkownikowi, kt\u00f3ry mia\u0142 prawo do tworzenia kont na lokalnej maszynie, podszywa\u0107 si\u0119 pod innego u\u017cytkownika w domenie, w tym pod u\u017cytkownika z uprawnieniami.\n<li class=\"l\"> CVE-2020-25721 \u2014 dla u\u017cytkownik\u00f3w, kt\u00f3rzy przeszli uwierzytelnienie za pomoc\u0105 Kerberos, nie zawsze wydawano unikalne identyfikatory dla Active Directory (objectSid), co mog\u0142o prowadzi\u0107 do kolizji mi\u0119dzy jednym u\u017cytkownikiem a innym.\n<li class=\"l\"> CVE-2021-23192 \u2014 w trakcie ataku MITM istnia\u0142a mo\u017cliwo\u015b\u0107 podmieniania fragment\u00f3w w du\u017cych \u017c\u0105daniach DCE\/RPC, kt\u00f3re by\u0142y dzielone na kilka cz\u0119\u015bci.  <\/ul>\n<p>\u0179r\u00f3d\u0142o: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=56132\">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 \u0432\u044b\u043f\u0443\u0441\u043a\u0438 \u043f\u0430\u043a\u0435\u0442\u0430 Samba 4.15.2, 4.14.10 \u0438 4.13.14 \u0441 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435\u043c 8 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, \u0431\u043e\u043b\u044c\u0448\u0438\u043d\u0441\u0442\u0432\u043e \u0438\u0437 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u043c\u043e\u0433\u0443\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u043f\u043e\u043b\u043d\u043e\u0439 \u043a\u043e\u043c\u043f\u0440\u043e\u043c\u0435\u0442\u0430\u0446\u0438\u0438 \u0434\u043e\u043c\u0435\u043d\u0430 Active Directory. \u041f\u0440\u0438\u043c\u0435\u0447\u0430\u0442\u0435\u043b\u044c\u043d\u043e, \u0447\u0442\u043e \u043e\u0434\u043d\u0443 \u0438\u0437 \u043f\u0440\u043e\u0431\u043b\u0435\u043c \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u044f\u043b\u0438 \u0441 2016 \u0433\u043e\u0434\u0430, \u0430 \u043f\u044f\u0442\u044c &#8212; \u0441 2020 \u0433\u043e\u0434\u0430, \u0442\u0435\u043c \u043d\u0435 \u043c\u0435\u043d\u0435\u0435 \u043e\u0434\u043d\u043e \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u043f\u0440\u0438\u0432\u0435\u043b\u043e \u043a \u043d\u0435\u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u0438 \u0437\u0430\u043f\u0443\u0441\u0442\u0438\u0442\u044c winbindd \u043f\u0440\u0438 \u043d\u0430\u043b\u0438\u0447\u0438\u0438 \u043d\u0430\u0441\u0442\u0440\u043e\u0439\u043a\u0438 &#171;allow trusted domains [&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-102262","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 \u0432\u044b\u043f\u0443\u0441\u043a\u0438 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