{"id":100142,"date":"2021-05-12T10:22:35","date_gmt":"2021-05-12T08:22:39","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/fragattacks-seriya-uyazvimostej-standartah-i-realizacziyah-wi-fi"},"modified":"2021-05-12T10:22:35","modified_gmt":"2021-05-12T08:22:39","slug":"fragattacks-seriya-uyazvimostej-standartah-i-realizacziyah-wi-fi","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hr\/blog\/news\/fragattacks-seriya-uyazvimostej-standartah-i-realizacziyah-wi-fi","title":{"rendered":"FragAttacks \u2014 serija ranjivosti u standardima i implementacijama Wi-Fi","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Mathy Vanhoef, autor napada KRACK na be\u017ei\u010dne mre\u017ee, otkrio je informacije o 12 ranjivosti koje poga\u0111aju razli\u010dite be\u017ei\u010dne ure\u0111aje. Utvr\u0111eni problemi predstavljeni su pod kodnim imenom FragAttacks i obuhva\u0107aju gotovo sve uobi\u010dajene be\u017ei\u010dne plo\u010de i pristupne to\u010dke \u2014 od testiranih 75 ure\u0111aja, svaki je bio podlo\u017ean barem jednom od navedenih metoda napada.     <\/p>\n<p>Problemi su podijeljeni u dvije kategorije: 3 ranjivosti su otkrivene izravno u Wi-Fi standardima i obuhva\u0107aju sve ure\u0111aje koji podr\u017eavaju aktualne IEEE 802.11 standarde (problemi su prisutni od 1997. godine). 9 ranjivosti odnosi se na gre\u0161ke i propuste u specifi\u010dnim implementacijama be\u017ei\u010dnih stekova. Druga kategorija predstavlja ve\u0107u opasnost, jer organizacija napada na propuste standarda zahtijeva specifi\u010dne postavke ili izvr\u0161avanje odre\u0111enih radnji od strane \u017ertve. Sve ranjivosti se manifestiraju neovisno o kori\u0161tenju protokola za osiguranje Wi-Fi-a, uklju\u010duju\u0107i i kori\u0161tenje WPA3.    <\/p>\n<p>Ve\u0107ina otkrivenih metoda napada omogu\u0107uje napada\u010du da izvr\u0161i zamjenu L2-okvire u za\u0161ti\u0107enoj mre\u017ei, \u0161to mu omogu\u0107ava da se ubaci u promet \u017ertve. Najrealisti\u010dniji scenarij napada uklju\u010duje zamjenu DNS odgovora kako bi se korisnik preusmjerio na napada\u010dev poslu\u017eitelj. Tako\u0111er se navodi primjer kori\u0161tenja ranjivosti za zaobila\u017eenje prevoditelja adresa na be\u017ei\u010dnom usmjeriva\u010du i organizaciju izravnog pristupa ure\u0111aju u lokalnoj mre\u017ei ili ignoriranje ograni\u010denja vatrozida. Drugi dio ranjivosti, koji je povezan s obradom fragmentiranih okvira, omogu\u0107ava ekstrakciju podataka o prometu u be\u017ei\u010dnoj mre\u017ei i presretanje korisni\u010dkih podataka koji se prenose bez \u0161ifriranja.     <\/p>\n<p>Istra\u017eitelj je pripremio demonstraciju koja pokazuje kako iskoristiti ranjivosti za presretanje lozinke koja se \u0161alje prilikom pristupa web-stranici putem ne\u0161ifriranog HTTP protokola. Tako\u0111er je prikazano kako napasti pametnu uti\u010dnicu koja se upravlja putem Wi-Fi veze i kako je koristiti kao platformu za nastavak napada na neure\u0111ene ure\u0111aje u lokalnoj mre\u017ei koji imaju neispravljene ranjivosti (na primjer, uspjelo je napasti neure\u0111eni ra\u010dunalni sustav s Windows 7 unutar mre\u017ee zaobila\u017eenjem NAT-a).            <center><div class=\"youtube-placeholder\" data-id=\"88YZ4061tYw\" onclick=\"loadVideo(this)\">\r\n        <img decoding=\"async\" src=\"https:\/\/img.youtube.com\/vi\/88YZ4061tYw\/hqdefault.jpg\" alt=\"Pogledajte video\" loading=\"lazy\" width=\"480\" height=\"360\" style=\"width:100%;height:auto;\">\r\n        <div class=\"play-button\"><\/div>\r\n    <\/div><\/center>    <\/p>\n<p>Kako bi napada\u010d iskoristio ranjivosti, mora se nalaziti unutar dosega ciljane be\u017ei\u010dne ure\u0111aja kako bi \u017ertvi poslao posebno oblikovan niz okvira. Problemi se ti\u010du kako klijentskih ure\u0111aja i be\u017ei\u010dnih kartica, tako i pristupnih to\u010daka i Wi-Fi usmjeriva\u010da. Op\u0107enito, kao za\u0161titne mjere dovoljna je upotreba HTTPS-a u kombinaciji s \u0161ifriranjem DNS prometa putem DNS over TLS ili DNS over HTTPS. Tako\u0111er je primjenjivo kori\u0161tenje <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/hr\/vpn\/\"   title=\"VPN\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"162\">VPN<\/a>.     <\/p>\n<p>\u010cetiri ranjivosti u implementacijama be\u017ei\u010dnih ure\u0111aja smatraju se najopasnijima, jer omogu\u0107uju trivijalne metode za postavljanje vlastitih ne\u0161ifriranih okvira:  <\/p>\n<ul>\n<li class=\"l\"> Ranjivosti CVE-2020-26140 i CVE-2020-26143 omogu\u0107uju umetanje okvira na nekim pristupnim to\u010dkama i be\u017ei\u010dnim karticama u Linuxu, Windowsima i FreeBSD-u.\n<li class=\"l\"> Ranjivost VE-2020-26145 omogu\u0107uje obradu \u0161irokopojasnih ne\u0161ifriranih fragmenata kao punopravnih okvira u macOS-u, iOS-u, FreeBSD-u i NetBSD-u.\n<li class=\"l\"> Ranjivost CVE-2020-26144 omogu\u0107uje obradu ne\u0161ifriranih rekonstruiranih okvira A-MSDU s EtherType EAPOL u Huawei Y6, Nexus 5X, FreeBSD-u i LANCOM AP-u.   <\/ul>\n<p>Ostale ranjivosti u implementacijama uglavnom su vezane uz probleme koji se javljaju prilikom obrade fragmentiranih okvira:  <\/p>\n<ul>\n<li class=\"l\"> CVE-2020-26139: omogu\u0107uje preusmjeravanje okvira s EAPOL zastavicom koje \u0161alje neautentificirani po\u0161iljatelj (poga\u0111a 2\/4 potvr\u0111ene pristupne to\u010dke, kao i rje\u0161enja zasnovana na NetBSD-u i FreeBSD-u).\n<li class=\"l\"> CVE-2020-26146: omogu\u0107uje rekonstruiranje \u0161ifriranih fragmenata bez provjere redoslijeda brojeva sekvenci.\n<li class=\"l\"> CVE-2020-26147: omogu\u0107uje rekonstruiranje mje\u0161ovitih \u0161ifriranih i ne\u0161ifriranih fragmenata.\n<li class=\"l\"> CVE-2020-26142: omogu\u0107uje obradu fragmentiranih okvira kao cjelovitih okvira (poga\u0111a OpenBSD i be\u017ei\u010dni modul ESP12-F).\n<li class=\"l\"> CVE-2020-26141: nedostaje provjera TKIP MIC za fragmentirane okvire.    <\/ul>\n<p>Problemi u specifikacijama:  <\/p>\n<ul>\n<li class=\"l\"> CVE-2020-24588 \u2014 napad na agregirane okvire (zastavica \u201eis aggregated\u201c nije za\u0161ti\u0107ena i mo\u017ee je napada\u010d zamijeniti u A-MSDU okvirima u WPA, WPA2, WPA3 i WEP). Kao primjer primjene napada spominje se preusmjeravanje korisnika na zlonamjenski DNS poslu\u017eitelj ili zaobila\u017eenje NAT-a.  <center><img decoding=\"async\" alt=\"FragAttacks - niz ranjivosti u standardima i implementacijama Wi-Fi\" src=\"\/wp-content\/uploads\/2021\/05\/bf3fed5fd117b86ac96dc8f23e8cd879.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>\n<li class=\"l\"> CVE-2020-245870 \u2014 napad na mije\u0161anje klju\u010deva (dozvoljena je rekonstrukcija fragmenata koji su \u0161ifrirani kori\u0161tenjem razli\u010ditih klju\u010deva u WPA, WPA2, WPA3 i WEP). Napad omogu\u0107ava odre\u0111ivanje podataka koje klijent \u0161alje, na primjer, utvr\u0111ivanje sadr\u017eaja kola\u010di\u0107a prilikom pristupa putem HTTP-a.  <center><img decoding=\"async\" alt=\"FragAttacks - niz ranjivosti u standardima i implementacijama Wi-Fi\" src=\"\/wp-content\/uploads\/2021\/05\/e7acd01c5864ae3371f16440c3e47c2c.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>\n<li class=\"l\"> CVE-2020-24586 \u2014 napad na predmemoriju fragmenata (standardi koji obuhva\u0107aju WPA, WPA2, WPA3 i WEP ne zahtijevaju uklanjanje ve\u0107 u\u010ditanih fragmenata iz predmemorije nakon novog povezivanja na mre\u017eu). Omogu\u0107ava odre\u0111ivanje podataka koje klijent \u0161alje te izvo\u0111enje zamjene vlastitih podataka.    <center><img decoding=\"async\" alt=\"FragAttacks - niz ranjivosti u standardima i implementacijama Wi-Fi\" src=\"\/wp-content\/uploads\/2021\/05\/ef87a0afaee47e83071d8d2a55815a2e.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>  <\/ul>\n<p>Za testiranje razine izlo\u017eenosti problemima svojih ure\u0111aja pripremljen je poseban alat i gotova Live slika za izradu bootabilnog USB ure\u0111aja. U Linuxu, problemi se manifestiraju u be\u017ei\u010dnoj mre\u017ei mac80211, u pojedinim be\u017ei\u010dnim upravlja\u010dkim programima i u firmverima koji se u\u010ditavaju na be\u017ei\u010dne kartice. Za otklanjanje ranjivosti predlo\u017een je set zakrpa koji pokriva mac80211 stog i upravlja\u010dke programe ath10k\/ath11k. Za neke ure\u0111aje, kao \u0161to su be\u017ei\u010dne kartice Intel, dodatno je potrebno instalirati a\u017euriranje firmvera.    <\/p>\n<p>Testovi tipi\u010dnih ure\u0111aja:  <center><img decoding=\"async\" alt=\"FragAttacks - niz ranjivosti u standardima i implementacijama Wi-Fi\" src=\"\/wp-content\/uploads\/2021\/05\/d255c5ffdb38c2a61a8da50a889167cd.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>  <\/p>\n<p>Testovi be\u017ei\u010dnih kartica u Linuxu i Windowsu:  <center><img decoding=\"async\" alt=\"FragAttacks - niz ranjivosti u standardima i implementacijama Wi-Fi\" src=\"\/wp-content\/uploads\/2021\/05\/06dd228788a85d2275ea19fd698202e0.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>  <\/p>\n<p>Testovi be\u017ei\u010dnih kartica u FreeBSD i NetBSD:  <center><img decoding=\"async\" alt=\"FragAttacks - niz ranjivosti u standardima i implementacijama Wi-Fi\" src=\"\/wp-content\/uploads\/2021\/05\/d3f3aa83a669cdc60710baff04493a92.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>    <\/p>\n<p>Proizvo\u0111a\u010di su o problemima obavije\u0161teni jo\u0161 prije 9 mjeseci. Ovoliki period embarga obja\u0161njava se koordiniranom pripremom a\u017euriranja i ka\u0161njenjima pri pripremi promjena specifikacija od strane ICASI i Wi-Fi Alliance. Prvotno je bilo planirano otkrivanje informacija 9. o\u017eujka, ali nakon procjene rizika odlu\u010deno je odgoditi objavu jo\u0161 dva mjeseca kako bi se omogu\u0107ilo vi\u0161e vremena za pripremu zakrpa uzimaju\u0107i u obzir slo\u017eenost promjena i pote\u0161ko\u0107e uzrokovane pandemijom COVID-19.     <\/p>\n<p>Zanimljivo je da, un despite embarga, Microsoft je u o\u017eujku u a\u017euriranju Windowsa prethodno ispravio neka sigurnosna ranjivost. Otkrivanje informacija odgo\u0111eno je tjedan dana od prvobitno planiranog roka, a Microsoft nije stigao ili nije htio izvr\u0161iti promjene u unaprijed pripremljenom planiranom a\u017euriranju, \u010dime je stvorio prijetnju za korisnike drugih sustava, jer su zlonamjerni akteri mogli dobiti informacije o ranjivostima putem izvo\u0111enja obratnog in\u017eenjeringa sadr\u017eaja a\u017euriranja.<br \/>\n<br \/>Izvor: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=55133\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041c\u044d\u0442\u0438 \u0412\u0430\u043d\u0445\u043e\u0444\u043e\u043c (Mathy Vanhoef), \u0430\u0432\u0442\u043e\u0440 \u0430\u0442\u0430\u043a\u0438 KRACK \u043d\u0430 \u0431\u0435\u0441\u043f\u0440\u043e\u0432\u043e\u0434\u043d\u044b\u0435 \u0441\u0435\u0442\u0438, \u0440\u0430\u0441\u043a\u0440\u044b\u043b \u0441\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u043e 12 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044f\u0445, \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u044e\u0449\u0438\u0445 \u0440\u0430\u0437\u043b\u0438\u0447\u043d\u044b\u0435 \u0431\u0435\u0441\u043f\u0440\u043e\u0432\u043e\u0434\u043d\u044b\u0435 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430. \u0412\u044b\u044f\u0432\u043b\u0435\u043d\u043d\u044b\u0435 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u044b \u043f\u043e\u0434 \u043a\u043e\u0434\u043e\u0432\u044b\u043c \u0438\u043c\u0435\u043d\u0435\u043c FragAttacks \u0438 \u043e\u0445\u0432\u0430\u0442\u044b\u0432\u0430\u044e\u0442 \u043f\u0440\u0430\u043a\u0442\u0438\u0447\u0435\u0441\u043a\u0438 \u0432\u0441\u0435 \u043d\u0430\u0445\u043e\u0434\u044f\u0449\u0438\u0435\u0441\u044f \u0432 \u043e\u0431\u0438\u0445\u043e\u0434\u0435 \u0431\u0435\u0441\u043f\u0440\u043e\u0432\u043e\u0434\u043d\u044b\u0435 \u043f\u043b\u0430\u0442\u044b \u0438 \u0442\u043e\u0447\u043a\u0438 \u0434\u043e\u0441\u0442\u0443\u043f\u0430 &#8212; \u0438\u0437 \u043f\u0440\u043e\u0442\u0435\u0441\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 75 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432, \u043a\u0430\u0436\u0434\u043e\u0435 \u0431\u044b\u043b\u043e \u043f\u043e\u0434\u0432\u0435\u0440\u0436\u0435\u043d\u043e \u043a\u0430\u043a \u043c\u0438\u043d\u0438\u043c\u0443\u043c \u043e\u0434\u043d\u043e\u043c\u0443 \u0438\u0437 \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u043d\u044b\u0445 \u043c\u0435\u0442\u043e\u0434\u043e\u0432 \u0430\u0442\u0430\u043a\u0438. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0440\u0430\u0437\u0434\u0435\u043b\u0435\u043d\u044b [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":100143,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-100142","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041c\u044d\u0442\u0438 \u0412\u0430\u043d\u0445\u043e\u0444\u043e\u043c (Mathy Vanhoef), \u0430\u0432\u0442\u043e\u0440 \u0430\u0442\u0430\u043a\u0438 KRACK \u043d\u0430 \u0431\u0435\u0441\u043f\u0440\u043e\u0432\u043e\u0434\u043d\u044b\u0435 \u0441\u0435\u0442\u0438, \u0440\u0430\u0441\u043a\u0440\u044b\u043b \u0441\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u043e 12 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044f\u0445, 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