{"id":30258,"date":"2019-10-31T21:34:32","date_gmt":"2019-10-31T18:34:32","guid":{"rendered":"https:\/\/prohoster.info\/blog\/netbios-v-rukah-hakera\/"},"modified":"2019-10-31T21:34:32","modified_gmt":"2019-10-31T18:34:32","slug":"netbios-v-rukah-hakera","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/netbios-v-rukah-hakera","title":{"rendered":"NetBIOS k\u00fcberh\u00e4kki k\u00e4tes","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Selles artiklis r\u00e4\u00e4gime l\u00fchidalt, mida meile r\u00e4\u00e4gib n\u00e4iliselt tavaline asi nagu <i>NetBIOS<\/i>. Millist teavet ta v\u00f5ib anda potentsiaalsele kurjategijale\/pentestijale.<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<p>Kuvatud rakenduste ala kuulub sisemistele ehk isoleeritud ja v\u00e4ljast ligip\u00e4\u00e4smatutele v\u00f5rkudele. Sellised v\u00f5rgud on tavaliselt igasugustes, isegi pisikeses ettev\u00f5ttes.<\/p>\n<p>Isegi <i>NetBIOS<\/i> kasutatakse tavaliselt v\u00f5rgunime hankimiseks. Ja seda piisab, et teha v\u00e4hemalt nelja asja.<\/p>\n<p><b>Hostide avastamine<\/b><br \/>\nKuna NetBIOS v\u00f5ib kasutada UDP-d transpordina, v\u00f5imaldab selle t\u00f6\u00f6kiirus avastada hoste v\u00e4ga suurtes v\u00f5rgus. N\u00e4iteks t\u00f6\u00f6riist <i>nbtscan<\/i>, mis kuulub samanimelisse paketti, v\u00f5ib vaid kahe sekundi jooksul (v\u00f5ib rivistuse maale panna) lahendada v\u00f5rguaadresse nagu 192.168.0.0\/16, samas kui traditsiooniline TCP-skannimine v\u00f5tab k\u00fcmneid minuteid. Seda funktsiooni saab kasutada hostide avastamise tehnikana (host sweep) v\u00e4ga suurtes v\u00f5rgus, millest ei ole midagi teada, enne kui jooksutada nmap'i. Kuigi tulemus ei taga 100% avastamist, kuna peamiselt vastavad Windowsi hostid ja mitte k\u00f5ik neist, v\u00f5imaldab see siiski kindlaks teha, millistes ligikaudsetes vahemikes elavad hostid asuvad.<\/p>\n<p><b>Hostide identifitseerimine<\/b><br \/>\nKasutades tulemusi nimede saamisest IP-aadressidest:<\/p>\n<p><img decoding=\"async\" alt=\"NetBIOS k\u00fcberh\u00e4kki k\u00e4tes\" src=\"\/wp-content\/uploads\/2019\/03\/c56ad0590b7023bf3fb192f46b8e23c8.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nsaame n\u00e4ha: peale selle, et nimi paljastab t\u00f6\u00f6jaama omaniku (kuigi see ei ole kaugel alati t\u00f5si), eristub \u00fcks aadress selgelt \u00fclej\u00e4\u00e4nutest. Me n\u00e4eme, et saime nime <i>KALI<\/i>. Selline k\u00e4itumine on enamasti iseloomulik <i>unix<\/i>-rakendusele <i>SMB\/NetBIOS<\/i> programmide paketis <i>samba<\/i> v\u00f5i v\u00e4ga vanadele <i>Windows 2000<\/i>. <br \/>\nNime saamine <i>KALI<\/i>, samas kui teistes hostides see &lt;<i>unknown<\/i>&gt; viitab nn <i>null-session<\/i>. Vaikeseadistustega <i>SMB<\/i>-serverid on selle suhtes altid. <i>linux<\/i> Null-session <i>ainult v\u00f5imaldab t\u00e4iesti anon\u00fc\u00fcmselt (ja me ei ole mitte \u00fchtki parooli sisestanud, nagu ekraanilt n\u00e4ha) saada piisavalt palju lisainfot, n\u00e4iteks kohalikud paroolipoliitikad, kohalike kasutajate nimekiri, grupid ja jagatud ressursside nimekiri (shar):<\/i> Sageli linux SMB<\/p>\n<p><img decoding=\"async\" alt=\"NetBIOS k\u00fcberh\u00e4kki k\u00e4tes\" src=\"\/wp-content\/uploads\/2019\/03\/29d9c5e9f760d95166abe62a5e8aef4d.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nkasutamine on. <i>linux SMB<\/i>-serverites on olemas avalikult ligip\u00e4\u00e4setavaid jagamisi, mitte ainult lugemiseks, vaid ka kirjutamiseks. Nende olemasolu erineb omavahel ning toob endaga kaasa erinevaid ohte, mille kasutamine \u00fcletab k\u00e4esoleva artikli raame.<\/p>\n<p><i>NetBIOS<\/i> samuti v\u00f5imaldab saada k\u00f5igi t\u00fc\u00fcpide nimed, mida t\u00f6\u00f6jaam salvestab:<\/p>\n<p><img decoding=\"async\" alt=\"NetBIOS k\u00fcberh\u00e4kki k\u00e4tes\" src=\"\/wp-content\/uploads\/2019\/03\/0d0f2d46683ff0a829668fafc9dc99d8.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nantud juhul v\u00f5imaldab teada saada, et host on ka domeeni kontroller <i>ARRIVA<\/i>.<\/p>\n<p>Samuti tasub veel lisaks t\u00e4helepanu p\u00f6\u00f6rata, et <i>NetBIOS<\/i> v\u00f5imaldab saada <i>mac<\/i>-aadress. Ja erinevalt arp-p\u00e4ringutest suudavad NetBIOS-p\u00e4ringud v\u00e4lja minna alamv\u00f5rgust. See v\u00f5ib olla kasulik, kui n\u00e4iteks tuleb leida mingisugune s\u00fclearvuti v\u00f5i spetsiifiline riistvara, teades selle tootjat. Kuna esimesed kolm oktetti <i>mac<\/i>-aadressidest iseloomustavad tootjat, saab laiali saata sarnaseid <i>NetBIOS<\/i>-p\u00e4ringuid k\u00f5igisse tuntud alamv\u00f5rkudesse, et leida vajalik seade (http:\/\/standards-oui.ieee.org\/oui.txt).<\/p>\n<p><b>Mugavuse m\u00e4\u00e4ramine <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/domain\/\"   title=\"domeeniga\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"1221\">domeeniga<\/a><\/b><br \/>\nSageli, liikudes ringi sisemistes ettev\u00f5tte v\u00f5rkudes, on vajalik r\u00fcnnata just t\u00f6\u00f6jaama, mis on domeenis (n\u00e4iteks, et t\u00f5sta \u00f5igusi domeeni administraatori tasemele) v\u00f5i vastupidi. Antud juhul <i>NetBIOS<\/i> v\u00f5ib taas aidata:<\/p>\n<p><img decoding=\"async\" alt=\"NetBIOS k\u00fcberh\u00e4kki k\u00e4tes\" src=\"\/wp-content\/uploads\/2019\/03\/4488df62ea520dc1898e0e52e5a419a1.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAntud juhul saadi abil <i>NetBIOS<\/i> k\u00f5ik t\u00fc\u00fcbid nimed. Nende seas v\u00f5ib n\u00e4ha, peale PC nime (mida oli juba varem saadud), ka t\u00f6\u00f6grupi nime. Vaikimisi on see tavaliselt midagi sellist <i>windows<\/i> WORKGROUP <i>IVAN-PC<\/i> v\u00f5i <i>, kuid kui t\u00f6\u00f6jaam on domeenis, siis on tema t\u00f6\u00f6grupp just domeeni nimi.<\/i>Nii v\u00f5ib abil<br \/>\nsaada teada, kas t\u00f6\u00f6jaam on domeenis ja kui jah, siis millises. <i>NetBIOS<\/i> Kuid kui on vajalik saada loetelu domeeni hostidest alamv\u00f5rgus, siis piisab \u00fche laiali saadetud p\u00e4ringu kohta domeeni nimega:<br \/>\nvastuseid saavad k\u00f5ik hostid, mis kuuluvad antud domeeni.<\/p>\n<p><img decoding=\"async\" alt=\"NetBIOS k\u00fcberh\u00e4kki k\u00e4tes\" src=\"\/wp-content\/uploads\/2019\/03\/d99e6b6ed805bebb425d9d2f22cd0bea.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nMultihomed hostide avastamine<\/p>\n<p><b>Ja l\u00f5puks, veel \u00fcks v\u00f5ib-olla v\u00e4ga v\u00e4he tuntud tehnika, mis on lihtsalt h\u00e4davajalik<\/b><br \/>\nteede leidmiseks <i>kaitstud, v\u00f5ib-olla isegi f\u00fc\u00fcsiliselt isoleeritud, v\u00f5rkudesse. Need v\u00f5ivad olla t\u00f6\u00f6stuslikud ettev\u00f5tte v\u00f5rgud, mis on t\u00e4idetud kontrolleritega. Selle v\u00f5rgu juurde p\u00e4\u00e4semine t\u00e4hendab r\u00fcndajale v\u00f5imalust m\u00f5jutada tehnoloogilist protsessi, ja ettev\u00f5ttele on see risk kannatada tohutuid kahjusid.<\/i> kaitstud, v\u00f5ib-olla isegi f\u00fc\u00fcsiliselt isoleeritud, v\u00f5rkudesse. Need v\u00f5ivad olla ettev\u00f5tete tehasev\u00f5rgud, millel on suured kontrollerid. Juhtimine sellele v\u00f5rku t\u00e4hendab r\u00fcndajale v\u00f5imalust m\u00f5jutada tehnoloogilist protsessi, ja ettev\u00f5ttele v\u00f5ib see t\u00e4hendada tohutuid rahalisi kaotusi.<br \/>\nSeega, asjaolu on see, et isegi kui v\u00f5rk on eraldatud ettev\u00f5tte v\u00f5rgust, armastavad m\u00f5ned administraatorid kas laiskuse t\u00f5ttu v\u00f5i muul viisil oma arvutitele t\u00f5sta veel \u00fche v\u00f5rgukaardi, et p\u00e4\u00e4seda sellesse v\u00f5rku. Ja see juhtub muidugi linnulennult m\u00f6\u00f6da k\u00f5iki ettev\u00f5tte v\u00f5rgu tulem\u00fc\u00fcri reegleid. Mugav, jah, aga mitte just v\u00e4ga ohutu, kui teid h\u00e4kitakse, muutute te sildaks sellesse v\u00f5rku ja kannate vastutust.<br \/>\nSiiski esineb sellele kuritegelikul isikul probleem \u2014 leida see administraator, kes on sellesse kaitstud v\u00f5rku sisenenud ebaseaduslikult. Veelgi enam, see on keeruline probleem ka v\u00f5rgu turvameestele. Suurtel ettev\u00f5tetel on see t\u00f5eliselt keeruline \u00fclesanne, justkui otsides n\u00f5ela heinas.<br \/>\nSelles situatsioonis oleks kuritegelikule isikule selgeid v\u00f5imalusi kaks:<br \/>\n1. proovida kasutada igat arvutit ettev\u00f5tte alamv\u00f5rgus sillana soovitud v\u00f5rku. See oleks v\u00e4ga mugav, kuid selline asi esineb harva, kuna <i>windows<\/i> hostidel <i>ip edastamine<\/i> on peaaegu alati v\u00e4lja l\u00fclitatud. Veelgi enam, selline kontroll on v\u00f5imalik vaid oma alamv\u00f5rgus, ning see n\u00f5uab kuritegelikult isikult t\u00e4pset teadmist sihtaadressist eraldatud v\u00f5rgus.<br \/>\n2. proovida kaugelt siseneda igasse hosti ja sooritada lihtne k\u00e4sk <i>ipconfig\/ifconfig<\/i>. Ja siin ei ole see sugugi lihtne. Isegi kui kuritegelik isik on saanud domeeni administraatori \u00f5igused, ei ole v\u00f5rgu tulem\u00fc\u00fcrid ja kohalikud tulem\u00fc\u00fcrid kadunud. Seega ei ole see \u00fclesanne 100% automatiseeritud. Tulemusena j\u00e4\u00e4b ebamugavus iga hosti juurde siseneda, \u00fcletades v\u00f5rgu tulem\u00fc\u00fcre (kiirelt blokeeriva 445\/tcp pordi) lootuses l\u00f5puks n\u00e4ha soovitud v\u00f5rgu liidest.<\/p>\n<p>Siiski on asi palju lihtsam. On \u00fcks \u00e4\u00e4rmiselt lihtne meetod, mis v\u00f5imaldab saada mingilt hostilt v\u00f5rgu liideste nimekirja. Oletame, et meil on mingi host:<\/p>\n<p><img decoding=\"async\" alt=\"NetBIOS k\u00fcberh\u00e4kki k\u00e4tes\" src=\"\/wp-content\/uploads\/2019\/03\/79b10413cb1b0c3ab1f3116af8d6609b.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nsee on tagasivaateline resolv ip-aadress \u2192 v\u00f5rgu nimi. Kui n\u00fc\u00fcd p\u00fc\u00fcame teha otsest resolvi v\u00f5rgu nimi \u2192 ip-aadress:<\/p>\n<p><img decoding=\"async\" alt=\"NetBIOS k\u00fcberh\u00e4kki k\u00e4tes\" src=\"\/wp-content\/uploads\/2019\/03\/e72c3b210658d935c58354d6a8e6092b.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nsiis saame teada, et antud host on samuti sillaks (ilmselt) mingisse teise v\u00f5rku. T\u00f5siselt tasub mainida, et antud juhul p\u00f6\u00f6rdus p\u00e4ring laialdasele levitusele. Teisis\u00f5nu, seda kuulevad ainult kuritegeliku isiku alamv\u00f5rgu hostid.<br \/>\nKui sihthost on alamv\u00f5rgust v\u00e4ljas, saab saata sihitud p\u00e4ringu:<\/p>\n<p><img decoding=\"async\" alt=\"NetBIOS k\u00fcberh\u00e4kki k\u00e4tes\" src=\"\/wp-content\/uploads\/2019\/03\/525de9a6d615691458beff622ea60d5b.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSelles olukorras on n\u00e4ha, et siht asub r\u00fcndaja alamv\u00f5rgust v\u00e4ljas. -B v\u00f5tmega on m\u00e4rgitud, et p\u00e4ring tuleks saata konkreetsele aadressile, mitte p\u00e4ringule.<br \/>\nN\u00fc\u00fcd tuleb lihtsalt koguda teavet kogu huvipakkuvast alamv\u00f5rgust, mitte \u00fchest aadressist. Selleks saab kasutada v\u00e4ikest <i>python<\/i>-skripti:<\/p>\n<p><img decoding=\"async\" alt=\"NetBIOS k\u00fcberh\u00e4kki k\u00e4tes\" src=\"\/wp-content\/uploads\/2019\/03\/f70721f54fe98d16c6ac6ae85b41c19c.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nJa m\u00f5ne sekundi p\u00e4rast:<\/p>\n<p><img decoding=\"async\" alt=\"NetBIOS k\u00fcberh\u00e4kki k\u00e4tes\" src=\"\/wp-content\/uploads\/2019\/03\/d37932871820fcf07de8ca68b5060f6d.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nK\u00e4esolevas improviseeritud n\u00e4ites oleks just nimelt p\u00fchendatud host esimeseks sihtm\u00e4rgiks, kui r\u00fcndaja j\u00e4litaks v\u00f5rku 172.16.1\/24.<\/p>\n<p><img decoding=\"async\" alt=\"NetBIOS k\u00fcberh\u00e4kki k\u00e4tes\" src=\"\/wp-content\/uploads\/2019\/03\/e5a4a9e3f61f1b7232ae230304e56b93.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nKorratud nimed erinevatel ip-del viitavad sellele, et host\u2019il on samuti kaks v\u00f5rguadapterit, kuid juba \u00fches alamv\u00f5rgus. Siinkohal tasub m\u00e4rkida, et <i>NetBIOS<\/i> ei avalikusta <i>alias<\/i>-te (mille saab h\u00f5lpsasti ARP-p\u00e4ringute kaudu v\u00e4lja arvutada, nagu ip samadega <i>mac<\/i>). Antud juhul <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/lir\/ipv4\/\"   title=\"ip-aadresside\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"620\">ip-aadresside<\/a> on erinevad <i>mac<\/i>.<\/p>\n<p>Teine n\u00e4ide selle meetodi kasutamisest on avalik Wi-Fi. M\u00f5nikord v\u00f5ib esineda olukordi, kus avaliku v\u00f5rgu k\u00fclalisseadmete seas on \u00fchendatud t\u00f6\u00f6tajad, kes t\u00f6\u00f6tavad suletud korporatiivses segmendis. Siis saab r\u00fcndaja v\u00e4ga kiiresti m\u00e4\u00e4rata endale tee juurdep\u00e4\u00e4suks suletud v\u00f5rgule, kasutades seda luuretehnikat:<\/p>\n<p><img decoding=\"async\" alt=\"NetBIOS k\u00fcberh\u00e4kki k\u00e4tes\" src=\"\/wp-content\/uploads\/2019\/03\/5feac7ee3cfbd70c4c323f8e9583227c.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAntud juhul oli 65 avaliku Wi-Fi kliendi seas kaks t\u00f6\u00f6jaama, millel oli lisaliides, mis t\u00f5en\u00e4oliselt kuulub ettev\u00f5tte v\u00f5rgule.<\/p>\n<p>Kui vahel on v\u00f5rgu segmentide vahel v\u00f5i otse t\u00f6\u00f6jaamades t\u00f5rke filtreerimine 445\/tcp pordi kaudu, mis takistab kaugjuurdep\u00e4\u00e4su s\u00fcsteemile (kaugkoodi t\u00e4itmine), siis antud juhul kasutatakse nimede lahendamiseks <i>NetBIOS<\/i> 137\/udp porti, mille teadlik blokeerimine on peaaegu tundmatu, kuna see m\u00f5jutab tugevalt v\u00f5rgu kasutusmugavust, n\u00e4iteks v\u00f5rgu\u00fcmbrus ja jne.<\/p>\n<p>Nagu \u00f6eldud, <i>enumeration is the key<\/i><br \/>\nKas selle vastu on kaitse? Seda pole, kuna see pole haavatavuse ning see on lihtsalt see, mis on vaikimisi olemas <i>windows<\/i> (Kalis <i>linux<\/i> k\u00e4itumine on veidi erinev). Ja kui te, ootamatult, v\u00f5rgu marsruutimise reeglite eiramise kaudu, l\u00fclitute suletud segmendi, leiab r\u00fcndaja teid kindlasti ja teeb seda v\u00e4ga kiiresti.<br \/>\n<br \/>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/445212\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u0434\u0430\u043d\u043d\u043e\u0439 \u0441\u0442\u0430\u0442\u044c\u0435 \u043f\u043e\u0439\u0434\u0451\u0442 \u043a\u0440\u0430\u0442\u043a\u043e\u0435 \u043f\u043e\u0432\u0435\u0441\u0442\u0432\u043e\u0432\u0430\u043d\u0438\u0435 \u043e \u0442\u043e\u043c, \u0447\u0442\u043e \u043d\u0430\u043c \u043c\u043e\u0436\u0435\u0442 \u0440\u0430\u0441\u0441\u043a\u0430\u0437\u0430\u0442\u044c \u0442\u0430\u043a\u0430\u044f \u043f\u0440\u0438\u0432\u044b\u0447\u043d\u0430\u044f \u0441 \u0432\u0438\u0434\u0443 \u0432\u0435\u0449\u044c \u043a\u0430\u043a NetBIOS. \u041a\u0430\u043a\u0443\u044e \u043e\u043d \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u0438\u0442\u044c \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044e \u0434\u043b\u044f \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e\u0433\u043e \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a\u0430\/\u043f\u0435\u043d\u0442\u0435\u0441\u0442\u0435\u0440\u0430. \u041f\u0440\u043e\u0434\u0435\u043c\u043e\u043d\u0441\u0442\u0440\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u0430\u044f \u043e\u0431\u043b\u0430\u0441\u0442\u044c \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u0440\u0430\u0437\u0432\u0435\u0434\u044b\u0432\u0430\u0442\u0435\u043b\u044c\u043d\u044b\u0445 \u0442\u0435\u0445\u043d\u0438\u043a \u043e\u0442\u043d\u043e\u0441\u0438\u0442\u0441\u044f \u043a \u0432\u043d\u0443\u0442\u0440\u0435\u043d\u043d\u0438\u043c, \u0442\u043e \u0435\u0441\u0442\u044c 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