{"id":53879,"date":"2019-12-12T00:00:00","date_gmt":"2019-12-11T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/problema-konfidentsialnosti-dannyh-v-active-directory"},"modified":"2020-02-18T14:01:49","modified_gmt":"2020-02-18T11:01:49","slug":"problema-konfidentsialnosti-dannyh-v-active-directory","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/administrirovanie\/problema-konfidentsialnosti-dannyh-v-active-directory","title":{"rendered":"Az Active Directory adatv\u00e9delmi probl\u00e9m\u00e1ja","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"Az Active Directory adatv\u00e9delmi probl\u00e9m\u00e1ja\" src=\"\/wp-content\/uploads\/2019\/12\/75c9e3a02efe7a37321c3faba3c836e0.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nPenetr\u00e1ci\u00f3s tesztekkel foglalkoztam a k\u00f6vetkez\u0151kkel: <noindex><a rel=\"nofollow\" href=\"https:\/\/www.varonis.com\/blog\/powerview-for-penetration-testing\/\">PowerView<\/a><\/noindex> \u00e9s haszn\u00e1ltam az Active Directory (tov\u00e1bbiakban: AD) felhaszn\u00e1l\u00f3i inform\u00e1ci\u00f3inak kinyer\u00e9s\u00e9re. Abban az id\u0151ben a biztons\u00e1gi csoporttags\u00e1gra vonatkoz\u00f3 inform\u00e1ci\u00f3k begy\u0171jt\u00e9s\u00e9re \u00f6sszpontos\u00edtottam, majd ezt az inform\u00e1ci\u00f3t felhaszn\u00e1lva navig\u00e1ltam a h\u00e1l\u00f3zaton. Mindenesetre az AD bizalmas adatokat tartalmaz a munkav\u00e1llal\u00f3kr\u00f3l, amelyeket egyes esetekben nem szabadna mindenkinek el\u00e9rnie a szervezetben. Val\u00f3j\u00e1ban a Windows f\u00e1jlrendszerekben l\u00e9tezik egy megfelel\u0151 <noindex><a rel=\"nofollow\" href=\"https:\/\/www.varonis.com\/blog\/3-deadly-file-permissions-mistakes\/\">\u00bbEveryone\u00ab<\/a><\/noindex>, amelyet bels\u0151 \u00e9s k\u00fcls\u0151 t\u00e1mad\u00f3k egyar\u00e1nt felhaszn\u00e1lhatnak.<\/p>\n<p>De miel\u0151tt a mag\u00e1n\u00e9let probl\u00e9m\u00e1ir\u00f3l \u00e9s a megold\u00e1sokr\u00f3l besz\u00e9ln\u00e9nk, n\u00e9zz\u00fck meg az AD-ban t\u00e1rolt adatokat.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h2>Az Active Directory olyan, mint a v\u00e1llalati Facebook <\/h2>\n<p>\nDe ebben az esetben m\u00e1r mindenkivel bar\u00e1tkozott! Lehet, hogy nem tudja koll\u00e9g\u00e1i kedvenc filmjeir\u0151l, k\u00f6nyveir\u0151l \u00e9s \u00e9ttermeir\u0151l, de az AD \u00e9rz\u00e9keny kapcsolattart\u00e1si<br \/>\nadatokat \u00e9s m\u00e1s olyan mez\u0151ket tartalmaz, amelyeket hackerek \u00e9s ak\u00e1r insider t\u00e1mad\u00f3k is felhaszn\u00e1lhatnak k\u00fcl\u00f6n\u00f6sebb technikai k\u00e9szs\u00e9gek n\u00e9lk\u00fcl.<\/p>\n<p>A rendszergazd\u00e1k term\u00e9szetesen ismerik az al\u00e1bbi k\u00e9perny\u0151k\u00e9pet. Ez az Active Directory Felhaszn\u00e1l\u00f3k \u00e9s Sz\u00e1m\u00edt\u00f3g\u00e9pek (ADUC) fel\u00fclete, ahol be\u00e1ll\u00edtj\u00e1k \u00e9s m\u00f3dos\u00edtj\u00e1k a felhaszn\u00e1l\u00f3i inform\u00e1ci\u00f3kat, valamint hozz\u00e1rendelik a felhaszn\u00e1l\u00f3kat a megfelel\u0151 csoportokhoz.<\/p>\n<p><img decoding=\"async\" alt=\"Az Active Directory adatv\u00e9delmi probl\u00e9m\u00e1ja\" src=\"\/wp-content\/uploads\/2019\/12\/f64d75191b3c3b5f2ec0e300f8ee0b7f.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAz AD tartalmaz munkav\u00e1llal\u00f3i neveket, c\u00edmeket \u00e9s telefonsz\u00e1mokat, ez\u00e9rt hasonl\u00edt egy telefonk\u00f6nyvre. De sokkal t\u00f6bb van ott! M\u00e1s f\u00fcl\u00f6k\u00f6n e-mail c\u00edm \u00e9s webc\u00edm, k\u00f6zvetlen felettes \u00e9s megjegyz\u00e9sek is tal\u00e1lhat\u00f3k.<\/p>\n<p>Mindenkinek a szervezetben l\u00e1tnia kell ezt az inform\u00e1ci\u00f3t, k\u00fcl\u00f6n\u00f6sen az OSINT <noindex><a rel=\"nofollow\" href=\"https:\/\/www.varonis.com\/blog\/we-know-about-your-companys-data-osint-lessons-for-c-levels\/\">kor\u00e1ban, amikor minden \u00faj r\u00e9szlet megk\u00f6nny\u00edti a tov\u00e1bbi inform\u00e1ci\u00f3k keres\u00e9s\u00e9t?<\/a><\/noindex>Term\u00e9szetesen nem! A probl\u00e9ma s\u00falyosbodik, amikor a c\u00e9g fels\u0151 vezet\u0151inek adatai minden munkav\u00e1llal\u00f3 sz\u00e1m\u00e1ra el\u00e9rhet\u0151ek.<\/p>\n<p>PowerView mindenki sz\u00e1m\u00e1ra<\/p>\n<h2>Itt l\u00e9p a k\u00e9pbe a PowerView. Egy nagyon felhaszn\u00e1l\u00f3bar\u00e1t PowerShell fel\u00fcletet ny\u00fajt a m\u00f6g\u00f6ttes (\u00e9s bonyolult) Win32 funkci\u00f3khoz, amelyek az AD-hez kapcsol\u00f3dnak. R\u00f6viden:<\/h2>\n<p>\nez lehet\u0151v\u00e9 teszi az AD mez\u0151inek egyszer\u0171 lek\u00e9r\u00e9s\u00e9t, mint p\u00e9ld\u00e1ul egy nagyon r\u00f6vid parancs v\u00e9grehajt\u00e1sa.<br \/>\nez az AD mez\u0151inek megszerz\u00e9s\u00e9t ugyanolyan egyszer\u0171v\u00e9 teszi, mint egy nagyon r\u00f6vid parancs be\u00edr\u00e1s\u00e1t.<\/p>\n<p>N\u00e9zz\u00fck meg Cruella Deville inform\u00e1ci\u00f3gy\u0171jt\u00e9s\u00e9nek p\u00e9ld\u00e1j\u00e1t, aki a c\u00e9g egyik vezet\u0151je. Ehhez haszn\u00e1ljuk a PowerView get-NetUser parancsot:<\/p>\n<p><img decoding=\"async\" alt=\"Az Active Directory adatv\u00e9delmi probl\u00e9m\u00e1ja\" src=\"\/wp-content\/uploads\/2019\/12\/1fe5f1772d4042d476f0a8d173932739.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nA PowerView telep\u00edt\u00e9se nem jelent komoly probl\u00e9m\u00e1t \u2013 gy\u0151z\u0151dj meg r\u00f3la te is az oldalon <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/PowerShellMafia\/PowerSploit\/tree\/master\/Recon\">github<\/a><\/noindex>. \u00c9s ami m\u00e9g fontosabb, sok PowerView parancs v\u00e9grehajt\u00e1s\u00e1hoz, mint p\u00e9ld\u00e1ul a get-NetUser, nincs sz\u00fcks\u00e9ged emelt szint\u0171 jogosults\u00e1gokra. \u00cdgy egy motiv\u00e1lt, de nem t\u00fal technikai h\u00e1tt\u00e9rrel rendelkez\u0151 munkat\u00e1rs k\u00f6nnyed\u00e9n belefoghat az AD-be.<\/p>\n<p>Az el\u0151z\u0151 k\u00e9perny\u0151k\u00e9pb\u0151l l\u00e1that\u00f3, hogy az insider gyorsan sok \u00fajdons\u00e1got tudhat meg Cruell\u00e1r\u00f3l. Te is \u00e9szrevetted, hogy az 'info' mez\u0151ben inform\u00e1ci\u00f3k tal\u00e1lhat\u00f3k a felhaszn\u00e1l\u00f3 szem\u00e9lyes szok\u00e1sair\u00f3l \u00e9s jelszav\u00e1r\u00f3l?<\/p>\n<p>Ez nem elm\u00e9leti lehet\u0151s\u00e9g. Az <noindex><a rel=\"nofollow\" href=\"https:\/\/info.varonis.com\/recorded-webinar\/basic-pen-testing-techniques-en\">m\u00e1s pentesterekkel folytatott p\u00e1rbesz\u00e9dekb\u0151l<\/a><\/noindex> tudom, hogy az AD-t jelszavak, titkos\u00edtatlan form\u00e1ban t\u00f6rt\u00e9n\u0151 keres\u00e9s c\u00e9lj\u00e1b\u00f3l szkennelik, \u00e9s sajnos gyakran ezek a pr\u00f3b\u00e1lkoz\u00e1sok sikeresek. Tudj\u00e1k, hogy a c\u00e9gek hanyagul kezelik az AD inform\u00e1ci\u00f3it, \u00e9s \u00e1ltal\u00e1ban nem tudnak a k\u00f6vetkez\u0151 t\u00e9m\u00e1r\u00f3l \u2013 az AD enged\u00e9lyeir\u0151l.<\/p>\n<h2>Az Active Directory saj\u00e1t ACL-jeivel rendelkezik<\/h2>\n<p>\nAz AD Felhaszn\u00e1l\u00f3k \u00e9s Sz\u00e1m\u00edt\u00f3g\u00e9pek interf\u00e9sze lehet\u0151v\u00e9 teszi az AD objektumainak enged\u00e9lyeinek be\u00e1ll\u00edt\u00e1s\u00e1t. Az AD-ban l\u00e9teznek ACL-ek, \u00e9s az adminisztr\u00e1torok ezeken kereszt\u00fcl rendelhetnek vagy tilthatnak le hozz\u00e1f\u00e9r\u00e9st. Kattints az ADUC View men\u00fc 'Advanced' opci\u00f3j\u00e1ra, majd amikor megnyitod a felhaszn\u00e1l\u00f3t, l\u00e1tni fogod a 'Security' f\u00fclet, ahol be\u00e1ll\u00edthatod az ACL-t. <\/p>\n<p>Cruella eset\u00e9ben nem akartam, hogy minden hiteles\u00edtett felhaszn\u00e1l\u00f3 (Authenticated Users) l\u00e1thassa a szem\u00e9lyes adatait, ez\u00e9rt megtiltottam a hozz\u00e1f\u00e9r\u00e9st a sz\u00e1mukra:<\/p>\n<p><img decoding=\"async\" alt=\"Az Active Directory adatv\u00e9delmi probl\u00e9m\u00e1ja\" src=\"\/wp-content\/uploads\/2019\/12\/d23fdce2d51fca00abc4af8e292936d6.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n\u00c9s most egy \u00e1tlagos felhaszn\u00e1l\u00f3 ezt l\u00e1tni fogja, ha megpr\u00f3b\u00e1lja a Get-NetUser-t a PowerView-ban:<\/p>\n<p><img decoding=\"async\" alt=\"Az Active Directory adatv\u00e9delmi probl\u00e9m\u00e1ja\" src=\"\/wp-content\/uploads\/2019\/12\/f27c39df9915865816b060b3111f4dcf.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSiker\u00fclt elrejtenem a potenci\u00e1lisan \u00e9rz\u00e9keny inform\u00e1ci\u00f3t a k\u00edv\u00e1ncsi szemek el\u0151l. Az relev\u00e1ns felhaszn\u00e1l\u00f3k hozz\u00e1f\u00e9r\u00e9s\u00e9nek meg\u0151rz\u00e9se \u00e9rdek\u00e9ben l\u00e9trehoztam egy m\u00e1sik ACL-t, hogy a VIP-csoport tagjai (Cruella \u00e9s m\u00e1s magas rang\u00fa koll\u00e9g\u00e1i) hozz\u00e1f\u00e9rjenek ezekhez az \u00e9rz\u00e9keny adatokhoz. M\u00e1s szavakkal, az AD enged\u00e9lyeit szerepk\u00f6r-alap\u00fa modellen val\u00f3s\u00edtottam meg, \u00edgy a \u00e9rz\u00e9keny adatok el\u00e9rhetetlenn\u00e9 v\u00e1ltak a legt\u00f6bb munkat\u00e1rs, k\u00f6zt\u00fck az insider sz\u00e1m\u00e1ra.<\/p>\n<p>Ennek ellen\u00e9re lehet\u0151s\u00e9g van a csoporttags\u00e1g l\u00e1thatatlann\u00e1 t\u00e9tel\u00e9re a felhaszn\u00e1l\u00f3k sz\u00e1m\u00e1ra, ha megfelel\u0151en \u00e1ll\u00edtod be az ACL-t a csoport objektum\u00e1ra az AD-n bel\u00fcl. Ez seg\u00edt a mag\u00e1n\u00e9let \u00e9s a biztons\u00e1g szempontj\u00e1b\u00f3l.<\/p>\n<p>A saj\u00e1t <noindex><a rel=\"nofollow\" href=\"https:\/\/www.varonis.com\/blog\/powerview-for-penetration-testing\/\">epikus pentest sorozatok<\/a><\/noindex> Megmutattam, hogyan lehet navig\u00e1lni a rendszeren, tanulm\u00e1nyozva a csoporttags\u00e1got a PowerViews Get-NetGroupMember seg\u00edts\u00e9g\u00e9vel. Az \u00e9n forgat\u00f3k\u00f6nyvemben a hozz\u00e1f\u00e9r\u00e9st korl\u00e1toztam egy adott csoport tagd\u00edj\u00e1ra vonatkoz\u00f3an. L\u00e1tja a parancs v\u00e9grehajt\u00e1s\u00e1nak eredm\u00e9ny\u00e9t a v\u00e1ltoz\u00e1sok el\u0151tt \u00e9s ut\u00e1n:<\/p>\n<p><img decoding=\"async\" alt=\"Az Active Directory adatv\u00e9delmi probl\u00e9m\u00e1ja\" src=\"\/wp-content\/uploads\/2019\/12\/4b0393315480c6dad9b57cf6289a3f00.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSiker\u00fclt elrejtenem Cruella \u00e9s Monty Burns tags\u00e1g\u00e1t a VIP csoportban, ami megnehez\u00edtette a hackerek \u00e9s bels\u0151 inform\u00e1torok sz\u00e1m\u00e1ra az infrastrukt\u00fara felfedez\u00e9s\u00e9t.<\/p>\n<p>Ez a bejegyz\u00e9s az\u00e9rt k\u00e9sz\u00fclt, hogy \u00f6szt\u00f6n\u00f6zz\u00f6n arra, hogy figyelmesebben vizsg\u00e1lja meg a mez\u0151ket<br \/>\nAD \u00e9s a kapcsol\u00f3d\u00f3 enged\u00e9lyeket. Az AD kiv\u00e1l\u00f3 forr\u00e1s, de gondoljon arra, hogyan szeretn\u00e9<br \/>\nmegosztani a bizalmas inform\u00e1ci\u00f3kat \u00e9s szem\u00e9lyes adatokat, k\u00fcl\u00f6n\u00f6sen,<br \/>\namikor a szervezete vezet\u0151 szem\u00e9lyeir\u0151l van sz\u00f3. \u00a0<br \/>\n<br \/>Forr\u00e1s: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/varonis\/blog\/479814\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u042f \u0437\u0430\u043d\u0438\u043c\u0430\u043b\u0441\u044f \u0442\u0435\u0441\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f\u043c\u0438 \u043d\u0430 \u043f\u0440\u043e\u043d\u0438\u043a\u043d\u043e\u0432\u0435\u043d\u0438\u0435 \u0441 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435\u043c PowerView \u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043b \u0435\u0433\u043e \u0434\u043b\u044f \u0438\u0437\u0432\u043b\u0435\u0447\u0435\u043d\u0438\u044f \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438 \u043e \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f\u0445 \u0438\u0437 Active Directory (\u0434\u0430\u043b\u0435\u0435 \u2013 AD). \u0412 \u0442\u043e \u0432\u0440\u0435\u043c\u044f \u044f \u0434\u0435\u043b\u0430\u043b \u0430\u043a\u0446\u0435\u043d\u0442 \u043d\u0430 \u0441\u0431\u043e\u0440\u0435 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438 \u043e \u0447\u043b\u0435\u043d\u0441\u0442\u0432\u0435 \u0432 \u0433\u0440\u0443\u043f\u043f\u0430\u0445 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438, \u0430 \u0437\u0430\u0442\u0435\u043c \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043b \u044d\u0442\u0443 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044e, \u0447\u0442\u043e\u0431\u044b \u043f\u0435\u0440\u0435\u043c\u0435\u0449\u0430\u0442\u044c\u0441\u044f \u043f\u043e \u0441\u0435\u0442\u0438. \u0412 \u043b\u044e\u0431\u043e\u043c \u0441\u043b\u0443\u0447\u0430\u0435, AD \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u0442 \u043a\u043e\u043d\u0444\u0438\u0434\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0435 \u0434\u0430\u043d\u043d\u044b\u0435 \u043e \u0441\u043e\u0442\u0440\u0443\u0434\u043d\u0438\u043a\u0430\u0445, \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0435 [&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":[688],"tags":[],"class_list":["post-53879","post","type-post","status-publish","format-standard","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u042f \u0437\u0430\u043d\u0438\u043c\u0430\u043b\u0441\u044f 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