{"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\/da\/blog\/news\/fragattacks-seriya-uyazvimostej-standartah-i-realizacziyah-wi-fi","title":{"rendered":"FragAttacks \u2014 en serie s\u00e5rbarheder i Wi-Fi-standarder og implementeringer","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Mathy Vanhoef, forfatteren af KRACK-angrebet p\u00e5 tr\u00e5dl\u00f8se netv\u00e6rk, har afsl\u00f8ret oplysninger om 12 s\u00e5rbarheder, der p\u00e5virker forskellige tr\u00e5dl\u00f8se enheder. De identificerede problemer pr\u00e6senteres under kodenavnet FragAttacks og d\u00e6kker n\u00e6sten alle g\u00e6ngse tr\u00e5dl\u00f8se kort og adgangspunkter \u2014 af de 75 testede enheder var hver is\u00e6r udsat for mindst \u00e9n af de foresl\u00e5ede angrebsmetoder.     <\/p>\n<p>Problemerne er opdelt i to kategorier: 3 s\u00e5rbarheder er identificeret direkte i Wi-Fi-standarderne og d\u00e6kker alle enheder, der underst\u00f8tter de aktuelle IEEE 802.11-standarder (problemerne har v\u00e6ret til stede siden 1997). 9 s\u00e5rbarheder vedr\u00f8rer fejl og mangler i specifikke implementeringer af tr\u00e5dl\u00f8se stakke. Den anden kategori udg\u00f8r den st\u00f8rste fare, da organisering af angreb p\u00e5 standardfejl kr\u00e6ver specifikke indstillinger eller, at offeret udf\u00f8rer bestemte handlinger. Alle s\u00e5rbarheder viser sig uanset brugen af protokoller til sikkerhed i Wi-Fi, herunder ved brug af WPA3.    <\/p>\n<p>De fleste identificerede angrebsmetoder tillader en angriber at inds\u00e6tte L2-rammer i et beskyttet netv\u00e6rk, hvilket giver mulighed for at f\u00e5 adgang til offerets trafik. Som det mest realistiske angrebsscenario n\u00e6vnes \u00e6ndring af DNS-svar for at omdirigere brugeren til angribernes v\u00e6rt. Der giver ogs\u00e5 et eksempel p\u00e5 brugen af s\u00e5rbarheder til at omg\u00e5 adressetranslateren p\u00e5 en tr\u00e5dl\u00f8s router og organisere direkte adgang til enheden i det lokale netv\u00e6rk eller ignorere begr\u00e6nsningerne i firewall'en. Den anden del af s\u00e5rbarhederne, der relaterer sig til behandling af fragmenterede rammer, giver mulighed for at udtr\u00e6kke trafikdata i det tr\u00e5dl\u00f8se netv\u00e6rk og opsnappe brugerdata, der sendes uden brug af kryptering.     <\/p>\n<p>Forskeren har forberedt en demonstration, der viser, hvordan s\u00e5rbarheder kan udnyttes til at opsnappe adgangskoder, der sendes, n\u00e5r der tilg\u00e5s en hjemmeside via HTTP uden kryptering. Det vises ogs\u00e5, hvordan man kan angribe en smart stikd\u00e5se, der styres via Wi-Fi, og bruge den som en platform til at forts\u00e6tte angrebet p\u00e5 opdateringsmodtagende enheder i det lokale netv\u00e6rk, som har udbedrede s\u00e5rbarheder (for eksempel lykkedes det at angribe en opdateringsmodtagende computer med Windows 7 i det interne netv\u00e6rk ved at omg\u00e5 NAT).            <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=\"Afspil 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>For at udnytte s\u00e5rbarhederne skal angriberen v\u00e6re inden for r\u00e6kkevidde af det m\u00e5lrettede tr\u00e5dl\u00f8se enhed for at sende et specifikt designet s\u00e6t af pakker til offeret. Problemerne ber\u00f8rer b\u00e5de klientenheder og tr\u00e5dl\u00f8se kort samt adgangsnetv\u00e6rk og Wi-Fi-routere. Generelt er det tilstr\u00e6kkeligt at bruge HTTPS kombineret med kryptering af DNS-trafik ved hj\u00e6lp af DNS over TLS eller DNS over HTTPS som en beskyttelsesforanstaltning. Ogs\u00e5 anvendelse af <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/da\/vpn\/\"   title=\"VPN\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"162\">VPN<\/a>.     <\/p>\n<p>De mest farlige s\u00e5rbarheder kaldes fire s\u00e5rbarheder i implementeringer af tr\u00e5dl\u00f8se enheder, der g\u00f8r det muligt at opn\u00e5 substitution af deres ukrypterede pakker med trivielle metoder:  <\/p>\n<ul>\n<li class=\"l\"> S\u00e5rbarhederne CVE-2020-26140 og CVE-2020-26143 tillader pakke-substitution p\u00e5 visse adgangsnetv\u00e6rk og tr\u00e5dl\u00f8se kort i Linux, Windows og FreeBSD.\n<li class=\"l\"> S\u00e5rbarheden VE-2020-26145 tillader behandling af bredb\u00e5nds ukrypterede fragmenter som komplette pakker i macOS, iOS og FreeBSD samt NetBSD.\n<li class=\"l\"> S\u00e5rbarheden CVE-2020-26144 tillader behandling af ukrypterede sammenbyggede pakker A-MSDU med EtherType EAPOL i Huawei Y6, Nexus 5X, FreeBSD og LANCOM AP.   <\/ul>\n<p>Andre s\u00e5rbarheder i implementeringer er hovedsageligt relateret til problemer, der opst\u00e5r ved behandling af fragmenterede pakker:  <\/p>\n<ul>\n<li class=\"l\"> CVE-2020-26139: tillader omdirigering af pakker med EAPOL-flag sendt af en ikke-godkendt afsender (ber\u00f8rer 2\/4 godkendte adgangsnetv\u00e6rk samt l\u00f8sninger baseret p\u00e5 NetBSD og FreeBSD).\n<li class=\"l\"> CVE-2020-26146: tillader genopbygning (reassembling) af krypterede fragmenter uden kontrol af sekvensnummerr\u00e6kkef\u00f8lgen.\n<li class=\"l\"> CVE-2020-26147: tillader genopbygning af blandede krypterede og ukrypterede fragmenter.\n<li class=\"l\"> CVE-2020-26142: tillader behandling af fragmenterede pakker som komplette pakker (ber\u00f8rer OpenBSD og den tr\u00e5dl\u00f8se modul ESP12-F).\n<li class=\"l\"> CVE-2020-26141: mangler tjek af TKIP MIC for fragmenterede rammer.    <\/ul>\n<p>Problemer i specifikationerne:  <\/p>\n<ul>\n<li class=\"l\"> CVE-2020-24588 \u2014 angreb p\u00e5 aggregerede rammer (flaget \u201eis aggregated\u201c er ikke beskyttet og kan blive \u00e6ndret af en angriber i A-MSDU-rammer i WPA, WPA2, WPA3 og WEP). Som et eksempel n\u00e6vnes det at omdirigere brugeren til en ondsindet DNS-server eller omg\u00e5 NAT.  <center><img decoding=\"async\" alt=\"FragAttacks - en serie s\u00e5rbarheder i Wi-Fi standarder og implementeringer.\" src=\"\/wp-content\/uploads\/2021\/05\/bf3fed5fd117b86ac96dc8f23e8cd879.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>\n<li class=\"l\"> CVE-2020-245870 \u2014 angreb p\u00e5 n\u00f8gleblanding (det er tilladt at rekonstruere fragmenter, der er krypteret med forskellige n\u00f8gler i WPA, WPA2, WPA3 og WEP). Angrebet g\u00f8r det muligt at bestemme de data, der er sendt af klienten, f.eks. at identificere indholdet af cookies ved HTTP-anmodninger.  <center><img decoding=\"async\" alt=\"FragAttacks - en serie s\u00e5rbarheder i Wi-Fi standarder og implementeringer.\" src=\"\/wp-content\/uploads\/2021\/05\/e7acd01c5864ae3371f16440c3e47c2c.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>\n<li class=\"l\"> CVE-2020-24586 \u2014 angreb p\u00e5 fragmentcache (standarderne, der d\u00e6kker WPA, WPA2, WPA3 og WEP, kr\u00e6ver ikke, at fragmenter, der allerede er blevet gemt i cachen, fjernes efter genforbindelse til netv\u00e6rket). Det g\u00f8r det muligt at bestemme de data, der er sendt af klienten, og foretage erstatning med ens egne data.    <center><img decoding=\"async\" alt=\"FragAttacks - en serie s\u00e5rbarheder i Wi-Fi standarder og implementeringer.\" src=\"\/wp-content\/uploads\/2021\/05\/ef87a0afaee47e83071d8d2a55815a2e.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>  <\/ul>\n<p>Der er udarbejdet et specielt v\u00e6rkt\u00f8jsudstyr og et klar live-billede til oprettelse af en bootbar USB-n\u00f8gle for at teste s\u00e5rbarheden af ens enheder. Problemerne manifesterer sig i det tr\u00e5dl\u00f8se netv\u00e6rk mac80211, i bestemte tr\u00e5dl\u00f8se drivere og i firmware, der er indl\u00e6st p\u00e5 de tr\u00e5dl\u00f8se kort. For at afhj\u00e6lpe s\u00e5rbarhederne er der foresl\u00e5et et s\u00e6t patches, der d\u00e6kker mac80211-stakken og ath10k\/ath11k-drivere. For visse enheder, s\u00e5som Intel tr\u00e5dl\u00f8se kort, kr\u00e6ves desuden installation af en firmwareopdatering.    <\/p>\n<p>Test af typiske enheder:  <center><img decoding=\"async\" alt=\"FragAttacks - en serie s\u00e5rbarheder i Wi-Fi standarder og implementeringer.\" src=\"\/wp-content\/uploads\/2021\/05\/d255c5ffdb38c2a61a8da50a889167cd.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>  <\/p>\n<p>Test af tr\u00e5dl\u00f8se kort i Linux og Windows:  <center><img decoding=\"async\" alt=\"FragAttacks - en serie s\u00e5rbarheder i Wi-Fi standarder og implementeringer.\" src=\"\/wp-content\/uploads\/2021\/05\/06dd228788a85d2275ea19fd698202e0.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>  <\/p>\n<p>Test af tr\u00e5dl\u00f8se kort i FreeBSD og NetBSD:  <center><img decoding=\"async\" alt=\"FragAttacks - en serie s\u00e5rbarheder i Wi-Fi standarder og implementeringer.\" src=\"\/wp-content\/uploads\/2021\/05\/d3f3aa83a669cdc60710baff04493a92.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>    <\/p>\n<p>Producenterne blev informeret om problemerne for 9 m\u00e5neder siden. Den lange embargoperiode forklares med koordineret forberedelse af opdateringer og forsinkelser i tilpasningen af \u00e6ndringer i specifikationerne af organisationer som ICASI og Wi-Fi Alliance. Oprindeligt var det planlagt at offentligg\u00f8re oplysningerne den 9. marts, men efter en vurdering af risiciene blev det besluttet at uds\u00e6tte offentligg\u00f8relsen i yderligere to m\u00e5neder for at give mere tid til forberedelsen af patches i betragtning af de ikke-trivielle \u00e6ndringer og de vanskeligheder, der opst\u00e5r som f\u00f8lge af COVID-19-pandemien.     <\/p>\n<p>Bem\u00e6rkelsesv\u00e6rdigt er det, at Microsoft i martsopdateringen af Windows for tidligt har fjernet nogle s\u00e5rbarheder p\u00e5 trods af embargoen. Informationerne blev offentliggjort en uge f\u00f8r den oprindeligt planlagte dato, og Microsoft havde ikke tid til, eller \u00f8nskede ikke, at lave \u00e6ndringer i det planlagte opdateringsudgave, hvilket skabte en trussel for brugerne af andre systemer, da ondsindede akt\u00f8rer kunne afd\u00e6kke oplysninger om s\u00e5rbarhederne gennem reverse engineering af indholdet i opdateringerne.<br \/>\n<br \/>Kilde: <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 5.0.3 - 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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