{"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\/cs\/blog\/news\/v-samba-ustraneno-8-opasnyh-uyazvimostej","title":{"rendered":"V Samba bylo odstran\u011bno 8 kritick\u00fdch zranitelnost\u00ed","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Byly zve\u0159ejn\u011bny opravy pro bal\u00ed\u010dky Samba 4.15.2, 4.14.10 a 4.13.14, kter\u00e9 \u0159e\u0161\u00ed 8 zranitelnost\u00ed, z nich\u017e v\u011bt\u0161ina m\u016f\u017ee v\u00e9st k \u00fapln\u00e9mu kompromitaci dom\u00e9ny Active Directory. Je pozoruhodn\u00e9, \u017ee jeden z probl\u00e9m\u016f byl opraven u\u017e od roku 2016 a p\u011bt \u2014 od roku 2020; nicm\u00e9n\u011b jedna oprava vedla k neschopnosti spustit winbindd p\u0159i nastaven\u00ed \u201eallow trusted domains = no\u201c (v\u00fdvoj\u00e1\u0159i maj\u00ed v \u00famyslu rychle zve\u0159ejnit dal\u0161\u00ed aktualizaci s opravou). Distribuci aktualizac\u00ed bal\u00ed\u010dk\u016f v distribuc\u00edch lze sledovat na str\u00e1nk\u00e1ch: Debian, Ubuntu, RHEL, SUSE, Fedora, Arch, FreeBSD.    <\/p>\n<p>Odstran\u011bn\u00e9 zranitelnosti:  <\/p>\n<ul>\n<li class=\"l\"> CVE-2020-25717 \u2014 z d\u016fvodu nedostatku v logice mapov\u00e1n\u00ed u\u017eivatel\u016f dom\u00e9ny na u\u017eivatele m\u00edstn\u00edho syst\u00e9mu mohl u\u017eivatel dom\u00e9ny Active Directory, kter\u00fd m\u011bl mo\u017enost vytv\u00e1\u0159et nov\u00e9 \u00fa\u010dty na sv\u00e9m syst\u00e9mu spravovan\u00e9 p\u0159es ms-DS-MachineAccountQuota, z\u00edskat p\u0159\u00edstup s pr\u00e1vy root na jin\u00e9 syst\u00e9my, kter\u00e9 pat\u0159\u00ed do <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/cs\/domain\/\"   title=\"dom\u00e9na\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"4094\">dom\u00e9na<\/a>.\n<li class=\"l\"> CVE-2021-3738 \u2014 p\u0159\u00edstup k ji\u017e uvoln\u011bn\u00e9 pam\u011b\u0165ov\u00e9 oblasti (Use after free) v implementaci RPC serveru Samba AD DC (dsdb), co\u017e potenci\u00e1ln\u011b m\u016f\u017ee v\u00e9st k eskalaci opr\u00e1vn\u011bn\u00ed p\u0159i manipulaci s ustanoven\u00edm spojen\u00ed.\n<li class=\"l\"> CVE-2016-2124 \u2014 klientsk\u00e1 spojen\u00ed, kter\u00e1 byla nav\u00e1z\u00e1na pomoc\u00ed protokolu SMB1, mohla b\u00fdt p\u0159evedena na p\u0159ed\u00e1v\u00e1n\u00ed parametr\u016f autentizace v otev\u0159en\u00e9m textu nebo prost\u0159ednictv\u00edm NTLM (nap\u0159\u00edklad pro odhalen\u00ed p\u0159ihla\u0161ovac\u00edch \u00fadaj\u016f b\u011bhem MITM \u00fatok\u016f), i kdy\u017e pro u\u017eivatele nebo aplikaci je v nastaven\u00ed definov\u00e1na povinn\u00e1 autentizace pomoc\u00ed Kerberos.\n<li class=\"l\"> CVE-2020-25722 \u2014 v dom\u00e9nov\u00e9m \u0159adi\u010di Active Directory na b\u00e1zi Samba se neprov\u00e1d\u011bly \u0159\u00e1dn\u00e9 kontroly p\u0159\u00edstupu k ulo\u017een\u00fdm dat\u016fm, co\u017e umo\u017enilo jak\u00e9mukoliv u\u017eivateli obej\u00edt autorizace a zcela kompromitovat dom\u00e9nu.\n<li class=\"l\"> CVE-2020-25718 \u2014 v dom\u00e9nov\u00e9m \u0159adi\u010di Active Directory na b\u00e1zi Samba nebyly spr\u00e1vn\u011b izolov\u00e1ny ticket-y Kerberos vydan\u00e9 RODC (Read-only domain controller), co\u017e mohlo b\u00fdt vyu\u017eito k z\u00edsk\u00e1n\u00ed tiket\u016f administr\u00e1tora od RODC bez po\u017eadovan\u00fdch opr\u00e1vn\u011bn\u00ed.\n<li class=\"l\"> CVE-2020-25719 \u2014 \u0159adi\u010d dom\u00e9ny Active Directory zalo\u017een\u00fd na Samb\u011b v\u017edy nezohled\u0148oval ve spojen\u00ed pole SID a PAC v Kerberos ticketech (p\u0159i nastaven\u00ed \u201egensec:require_pac = true\u201c se kontrolovalo pouze jm\u00e9no, a PAC nebyl br\u00e1n v \u00favahu), co\u017e umo\u017enilo u\u017eivateli s pr\u00e1vem vytv\u00e1\u0159et \u00fa\u010dty v m\u00edstn\u00edm syst\u00e9mu p\u0159edst\u00edrat, \u017ee je jin\u00fdm u\u017eivatelem v dom\u00e9n\u011b, v\u010detn\u011b privilegovan\u00fdch.\n<li class=\"l\"> CVE-2020-25721 \u2014 pro u\u017eivatele, kte\u0159\u00ed se autentizovali pomoc\u00ed Kerberos, nebyly v\u017edy vyd\u00e1v\u00e1ny unik\u00e1tn\u00ed identifik\u00e1tory pro Active Directory (objectSid), co\u017e mohlo v\u00e9st k p\u0159ekryv\u016fm jednoho u\u017eivatele s jin\u00fdm.\n<li class=\"l\"> CVE-2021-23192 \u2014 p\u0159i prov\u00e1d\u011bn\u00ed MITM \u00fatoku byla mo\u017enost podvodu fragment\u016f ve velk\u00fdch DCE\/RPC po\u017eadavc\u00edch, kter\u00e9 byly rozd\u011bleny do n\u011bkolika \u010d\u00e1st\u00ed.  <\/ul>\n<p>Zdroj: <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 5.0.3 - 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 \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 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