{"id":181775,"date":"2026-05-28T02:48:09","date_gmt":"2026-05-28T00:48:09","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimosti-v-samba-dopuskayushhie-udalyonnoe-vypolnenie-koda-v-redkih-konfiguracziyah"},"modified":"2026-05-28T02:48:09","modified_gmt":"2026-05-28T00:48:09","slug":"uyazvimosti-v-samba-dopuskayushhie-udalyonnoe-vypolnenie-koda-v-redkih-konfiguracziyah","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/uyazvimosti-v-samba-dopuskayushhie-udalyonnoe-vypolnenie-koda-v-redkih-konfiguracziyah","title":{"rendered":"Zranitelnosti v Samba umo\u017e\u0148uj\u00edc\u00ed vzd\u00e1len\u00e9 spu\u0161t\u011bn\u00ed k\u00f3du v vz\u00e1cn\u00fdch konfigurac\u00edch","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Byly uvedeny opravn\u00e9 verze bal\u00ed\u010dku Samba 4.24.3, 4.23.8 a 4.22.10, kter\u00e9 poskytuj\u00ed otev\u0159enou implementaci protokol\u016f SMB a Active Directory. V nov\u00fdch verz\u00edch bylo odstran\u011bno 6 zranitelnost\u00ed, z nich\u017e dv\u011b umo\u017e\u0148uj\u00ed vzd\u00e1len\u00e9mu neautorizovan\u00e9mu \u00fato\u010dn\u00edkovi prov\u00e9st sv\u016fj k\u00f3d na serveru:<\/p>\n<ul>\n<li class=\"l\"> CVE-2026-4408 \u2014 zranitelnost v implementaci serveru SAMR (Security Account Manager) nad DCE\/RPC, kter\u00fd se pou\u017e\u00edv\u00e1 pro spr\u00e1vu u\u017eivatelsk\u00fdch \u00fadaj\u016f a datab\u00e1z\u00ed s u\u017eivateli a skupinami. Probl\u00e9m se t\u00fdk\u00e1 souborov\u00fdch <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/cs\/server\/\" title=\"servery\" data-wpil-keyword-link=\"linked\">servery<\/a> a klasick\u00fdch dom\u00e9nov\u00fdch \u0159adi\u010d\u016f (ne Active Directory), kter\u00e9 spou\u0161t\u011bj\u00ed proces samba-dcerpcd jako syst\u00e9movou slu\u017ebu (ve v\u00fdchoz\u00edm nastaven\u00ed nen\u00ed spu\u0161t\u011bna) a pou\u017e\u00edvaj\u00ed skript pro ov\u011b\u0159ov\u00e1n\u00ed hesla, ur\u010den\u00fd v smb.conf pomoc\u00ed nastaven\u00ed \u201echeck password script\u201c s pou\u017eit\u00edm z\u00e1stupn\u00e9ho symbolu \u201e%u\u201c v p\u0159\u00edkazu spu\u0161t\u011bn\u00ed (konfigurace bez z\u00e1stupn\u00e9ho symbolu \u201e%u\u201c probl\u00e9mu nepodl\u00e9haj\u00ed).\n<p>Zranitelnost je zp\u016fsobena t\u00edm, \u017ee RPC slu\u017eby SamValidatePasswordChange a SamValidatePasswordReset p\u0159ed\u00e1vaj\u00ed u\u017eivatelsk\u00e9 jm\u00e9no a heslo do skriptu, ur\u010den\u00e9ho p\u0159es nastaven\u00ed \u201echeck password script\u201c, bez escapov\u00e1n\u00ed speci\u00e1ln\u00edch znak\u016f p\u0159i dosazen\u00ed u\u017eivatelsk\u00e9ho jm\u00e9na p\u0159es \u201e%u\u201c. Zranitelnost umo\u017e\u0148uje prov\u00e9st libovoln\u00e9 shell p\u0159\u00edkazy na <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/cs\/server\/dts-dronten\/\" title=\"serveru\" data-wpil-keyword-link=\"linked\">serveru<\/a> p\u0159i zad\u00e1n\u00ed speci\u00e1ln\u011b form\u00e1tovan\u00e9ho u\u017eivatelsk\u00e9ho jm\u00e9na. Jako obchvat zabezpe\u010den\u00ed se doporu\u010duje p\u0159ed\u00e1vat do skriptu u\u017eivatelsk\u00e9 jm\u00e9no nikoli p\u0159es z\u00e1stupn\u00fd symbol \u201e%u\u201c, ale p\u0159es prom\u011bnnou prost\u0159ed\u00ed SAMBA_CPS_ACCOUNT_NAME.<\/p>\n<li class=\"l\"> CVE-2026-4480 \u2014 zranitelnost v syst\u00e9mu tisku, kter\u00fd pou\u017e\u00edv\u00e1 nastaven\u00ed \u201eprint command\u201c se z\u00e1stupn\u00fdm symbolem \u201e%J\u201c. Probl\u00e9m je zp\u016fsoben t\u00edm, \u017ee u\u017eivatelsky zadan\u00fd popis pr\u00e1ce tisku je p\u0159ed\u00e1n p\u0159es z\u00e1stupn\u00fd symbol \u201e%J\u201c bez \u0159\u00e1dn\u00e9ho escapov\u00e1n\u00ed speci\u00e1ln\u00edch znak\u016f, co\u017e umo\u017e\u0148uje vzd\u00e1len\u011b prov\u00e9st sv\u016fj k\u00f3d p\u0159i zasl\u00e1n\u00ed \u00falohy na tisk, v\u010detn\u011b dostupn\u00e9ho ve v\u00fdchoz\u00edm stavu v re\u017eimu hosta. Jako obchvat zabezpe\u010den\u00ed lze odstranit z\u00e1stupn\u00fd symbol<br \/>\n\u201e%J\u201c z nastaven\u00ed \u201eprint command\u201c v smb.conf.<\/p>\n<\/ul>\n<p>Tak\u00e9 v nov\u00fdch verz\u00edch bylo odstran\u011bno n\u011bkolik dal\u0161\u00edch zranitelnost\u00ed, kter\u00e9 umo\u017e\u0148uje obej\u00edt kontrolu p\u0159\u00edstupu k xattr atributu \u201ereparse point\u201c, op\u011btovn\u011b p\u0159epsat soubor p\u0159i pou\u017eit\u00ed vfs modulu WORM (Write-Once, Read Many), nainstalovat certifik\u00e1t p\u0159es HTTP bez ov\u011b\u0159en\u00ed a zp\u016fsobit havarijn\u00ed ukon\u010den\u00ed. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/cs\/server\/dts-los-angeles\/\" title=\"serveru\" data-wpil-keyword-link=\"linked\">serveru<\/a> AD DC WINS zasl\u00e1n\u00edm speci\u00e1ln\u011b form\u00e1tovan\u00e9ho UDP paketu.<br \/>\n<br \/>Zdroj: <a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=65545\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u044b \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0435 \u0440\u0435\u043b\u0438\u0437\u044b \u043f\u0430\u043a\u0435\u0442\u0430 Samba 4.24.3, 4.23.8 \u0438 4.22.10, \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0435\u0433\u043e \u043e\u0442\u043a\u0440\u044b\u0442\u0443\u044e \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044e \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u043e\u0432 SMB \u0438 Active Directory. \u0412 \u043d\u043e\u0432\u044b\u0445 \u0432\u0435\u0440\u0441\u0438\u044f\u0445 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u043e 6 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, \u0438\u0437 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0434\u0432\u0435 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0442 \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u043c\u0443 \u043d\u0435\u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u0446\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c\u0443 \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0435\u043c\u0443 \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u0441\u0432\u043e\u0439 \u043a\u043e\u0434 \u043d\u0430 \u0441\u0435\u0440\u0432\u0435\u0440\u0435: CVE-2026-4408 &#8212; \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u0441\u0435\u0440\u0432\u0435\u0440\u0430 SAMR (Security Account Manager) \u043f\u043e\u0432\u0435\u0440\u0445 DCE\/RPC, \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u043e\u0433\u043e \u0434\u043b\u044f \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u0443\u0447\u0451\u0442\u043d\u044b\u043c\u0438 \u0434\u0430\u043d\u043d\u044b\u043c\u0438 \u0438 \u0411\u0414 c [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-181775","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=\"\u041f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u044b \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0435 \u0440\u0435\u043b\u0438\u0437\u044b \u043f\u0430\u043a\u0435\u0442\u0430 Samba 4.24.3, 4.23.8 \u0438 4.22.10, \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0435\u0433\u043e \u043e\u0442\u043a\u0440\u044b\u0442\u0443\u044e \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044e 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