{"id":94510,"date":"2020-09-18T01:41:56","date_gmt":"2020-09-17T23:41:56","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/realizacziya-kontrollera-domena-v-samba-okazalas-podverzhena-uyazvimosti-zerologin"},"modified":"2020-09-18T01:41:56","modified_gmt":"2020-09-17T23:41:56","slug":"realizacziya-kontrollera-domena-v-samba-okazalas-podverzhena-uyazvimosti-zerologin","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/realizacziya-kontrollera-domena-v-samba-okazalas-podverzhena-uyazvimosti-zerologin","title":{"rendered":"Implementace dom\u00e9nov\u00e9ho kontrol\u00e9ru v Samba byla vystavena zranitelnosti ZeroLogin.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V\u00fdvoj\u00e1\u0159i projektu Samba varovali<\/a><\/noindex> u\u017eivatele, \u017ee ned\u00e1vno byla odhalena<\/a><\/noindex> zranitelnost ZeroLogin v syst\u00e9mu Windows (CVE-2020-1472<\/a><\/noindex>) se projevuje<\/a><\/noindex> a v implementaci dom\u00e9nov\u00e9ho \u0159adi\u010de zalo\u017een\u00e9ho na Samba. Zranitelnost byl zp\u016fsoben<\/a><\/noindex> vypl\u00fdv\u00e1 z nedostatk\u016f v protokolu MS-NRPC a kryptografick\u00e9m algoritmu AES-CFB8 a p\u0159i \u00fasp\u011b\u0161n\u00e9m vyu\u017eit\u00ed umo\u017e\u0148uje \u00fato\u010dn\u00edkovi z\u00edskat p\u0159\u00edstup administr\u00e1tora v dom\u00e9nov\u00e9m \u0159adi\u010di.<\/p>\n

Podstatou zranitelnosti je, \u017ee protokol MS-NRPC (Netlogon Remote Protocol) umo\u017e\u0148uje p\u0159i v\u00fdm\u011bn\u011b \u00fadaj\u016f o autentizaci p\u0159ej\u00edt na pou\u017e\u00edv\u00e1n\u00ed ne\u0161ifrovan\u00e9ho RPC spojen\u00ed. Po tomto m\u016f\u017ee \u00fato\u010dn\u00edk vyu\u017e\u00edt slabinu v algoritmu AES-CFB8 pro podvr\u017een\u00ed (spu\u0444ing) \u00fasp\u011b\u0161n\u00e9ho p\u0159ihl\u00e1\u0161en\u00ed. Pro p\u0159ihl\u00e1\u0161en\u00ed s administr\u00e1torsk\u00fdmi pr\u00e1vy je pr\u016fm\u011brn\u011b zapot\u0159eb\u00ed p\u0159ibli\u017en\u011b 256 pokus\u016f o spu\u0444ing. K proveden\u00ed \u00fatoku nen\u00ed nutn\u00e9 m\u00edt platn\u00fd \u00fa\u010det na \u0159\u00edd\u00edc\u00edm serveru dom\u00e9ny \u2014 pokusy o spu\u0444ing lze prov\u00e1d\u011bt s pou\u017eit\u00edm nespr\u00e1vn\u00e9ho hesla. Po\u017eadavek na autentizaci p\u0159es NTLM bude p\u0159esm\u011brov\u00e1n na \u0159\u00edd\u00edc\u00ed server dom\u00e9ny, kter\u00fd vr\u00e1t\u00ed odm\u00edtnut\u00ed p\u0159\u00edstupu, ale \u00fato\u010dn\u00edk m\u016f\u017ee tento odpov\u011b\u010f zfal\u0161ovat, a napaden\u00fd syst\u00e9m to pova\u017euje za \u00fasp\u011b\u0161n\u00e9 p\u0159ihl\u00e1\u0161en\u00ed.<\/p>\n

Ve Samba se zranitelnost projevuje pouze v syst\u00e9mech, kter\u00e9 nepou\u017e\u00edvaj\u00ed nastaven\u00ed \u00abserver schannel = yes\u00bb, kter\u00e9 je od Samba 4.8 nastaveno jako v\u00fdchoz\u00ed. Konkr\u00e9tn\u011b mohou b\u00fdt ohro\u017eeny syst\u00e9my s nastaven\u00edm \u00abserver schannel = no\u00bb a \u00abserver schannel = auto\u00bb, kter\u00e9 umo\u017e\u0148uj\u00ed v Samba pou\u017e\u00edvat stejn\u00e9 nedostatky v algoritmu AES-CFB8, jak\u00e9 jsou ve Windows. <\/p>\n

P\u0159i pou\u017eit\u00ed p\u0159ipraven\u00e9ho referen\u010dn\u00edho prototypu exploitu<\/a><\/noindex>, v Samb\u011b se provede pouze vol\u00e1n\u00ed ServerAuthenticate3, zat\u00edmco operace ServerPasswordSet2 kon\u010d\u00ed chybou (exploit vy\u017eaduje p\u0159izp\u016fsoben\u00ed pro Sambu). O vzniku alternativn\u00edch exploit\u016f (1<\/a><\/noindex>, 2<\/a><\/noindex>, 3<\/a><\/noindex>, 4<\/a><\/noindex>) nejsou k dispozici \u017e\u00e1dn\u00e9 informace. Pokusy o \u00fatok na syst\u00e9my lze sledovat anal\u00fdzou p\u0159\u00edtomnosti z\u00e1znam\u016f s odkazem na ServerAuthenticate3 a ServerPasswordSet v log\u00e1ch audit\u016f Samba.<\/p>\n

<\/a><\/noindex><\/p>\n

Zdroj: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 Samba \u043f\u0440\u0435\u0434\u0443\u043f\u0440\u0435\u0434\u0438\u043b\u0438 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439, \u0447\u0442\u043e \u043d\u0435\u0434\u0430\u0432\u043d\u043e \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u043d\u0430\u044f \u0432 Windows \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c ZeroLogin (CVE-2020-1472) \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0438 \u0432 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u043b\u0435\u0440\u0430 \u0434\u043e\u043c\u0435\u043d\u0430 \u043d\u0430 \u0431\u0430\u0437\u0435 Samba. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u043d\u0435\u0434\u043e\u0440\u0430\u0431\u043e\u0442\u043a\u0430\u043c\u0438 \u0432 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0435 MS-NRPC \u0438 \u043a\u0440\u0438\u043f\u0442\u043e\u0430\u043b\u0433\u043e\u0440\u0438\u0442\u043c\u0435 AES-CFB8, \u0438 \u043f\u0440\u0438 \u0443\u0441\u043f\u0435\u0448\u043d\u043e\u0439 \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a\u0443 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u0434\u043e\u0441\u0442\u0443\u043f \u0430\u0434\u043c\u0438\u043d\u0438\u0441\u0442\u0440\u0430\u0442\u043e\u0440\u0430 \u0432 \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u043b\u0435\u0440\u0435 \u0434\u043e\u043c\u0435\u043d\u0430. \u0421\u0443\u0442\u044c \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432 \u0442\u043e\u043c, \u0447\u0442\u043e \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b MS-NRPC (Netlogon Remote Protocol) \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u043f\u0440\u0438 […]<\/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-94510","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\udd47Implementace dom\u00e9nov\u00e9ho \u0159adi\u010de v Samb\u011b byla vystavena zranitelnosti ZeroLogin | ProHoster","description":"V\u00fdvoj\u00e1\u0159i projektu Samba varovali u\u017eivatele, \u017ee 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