{"id":31424,"date":"2019-10-31T21:41:11","date_gmt":"2019-10-31T18:41:11","guid":{"rendered":"https:\/\/prohoster.info\/blog\/uyazvimosti-v-tehnologii-zashhity-besprovodnyh-setej-wpa3-i-v-eap-pwd\/"},"modified":"2019-10-31T21:41:11","modified_gmt":"2019-10-31T18:41:11","slug":"uyazvimosti-v-tehnologii-zashhity-besprovodnyh-setej-wpa3-i-v-eap-pwd","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sv\/blog\/news\/uyazvimosti-v-tehnologii-zashhity-besprovodnyh-setej-wpa3-i-v-eap-pwd","title":{"rendered":"S\u00e5rbarheter i WPA3-tr\u00e5dl\u00f6s s\u00e4kerhetsteknik och EAP-pwd","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Mathy Vanhoef, f\u00f6rfattaren av KRACK-attackerna mot tr\u00e5dl\u00f6sa n\u00e4tverk med WPA2, och Eyal Ronen, medf\u00f6rfattare till vissa attacker mot TLS, har avsl\u00f6jat information om sex s\u00e5rbarheter (CVE-2019-9494 \u2014 CVE-2019-9499) i skyddsteknologin f\u00f6r tr\u00e5dl\u00f6sa n\u00e4tverk WPA3. Dessa s\u00e5rbarheter m\u00f6jligg\u00f6r \u00e5terskapande av anslutningsl\u00f6senord och ger \u00e5tkomst till det tr\u00e5dl\u00f6sa n\u00e4tverket utan att veta l\u00f6senordet. S\u00e5rbarheterna samlas under kodnamnet Dragonblood och m\u00f6jligg\u00f6r kompromettering av anslutningsf\u00f6rhandlingsmetoden Dragonfly, som erbjuder skydd mot offline-l\u00f6senordsuppskattning. F\u00f6rutom WPA3 till\u00e4mpas metoden Dragonfly ocks\u00e5 f\u00f6r att skydda mot ordboksangrepp i EAP-pwd-protokollet, som anv\u00e4nds i Android, RADIUS-servrar och i hostapd\/wpa_supplicant.<\/p>\n<p>Forskningen har identifierat tv\u00e5 huvudsakliga typer av arkitekturproblem i WPA3. B\u00e5da typerna av problem kan i slut\u00e4ndan anv\u00e4ndas f\u00f6r att \u00e5terskapa \u00e5tkomstl\u00f6senordet. Den f\u00f6rsta typen m\u00f6jligg\u00f6r en nedgradering till os\u00e4kra kryptografiska metoder (nedgraderingsattack): verktyg f\u00f6r att s\u00e4kerst\u00e4lla kompatibilitet med WPA2 (transitl\u00e4ge som till\u00e5ter anv\u00e4ndning av b\u00e5de WPA2 och WPA3) g\u00f6r det m\u00f6jligt f\u00f6r en angripare att tvinga klienten att genomf\u00f6ra den WPA2 fyra-stegs anslutningsmetoden, vilket g\u00f6r det m\u00f6jligt att sedan anv\u00e4nda klassiska metoder f\u00f6r l\u00f6senordsattacker som \u00e4r till\u00e4mpliga p\u00e5 WPA2. Dessutom har m\u00f6jligheten f\u00f6r en nedgraderingsattack direkt p\u00e5 Dragonfly-metakonsensusmetoden identifierats, vilket till\u00e5ter en nedgradering till mindre skyddade typer av elliptiska kurvor.<\/p>\n<p>Den andra typen av problem leder till l\u00e4ckage av information om l\u00f6senordets egenskaper via sido-kanaler och bygger p\u00e5 brister i l\u00f6senordskodningsmetoden i Dragonfly, vilket m\u00f6jligg\u00f6r att \u00e5terskapa det ursprungliga l\u00f6senordet baserat p\u00e5 indirekta data, som \u00e4ndringar i f\u00f6rseningar under operationer. Den algoritm som anv\u00e4nds i Dragonfly f\u00f6r att omvandla hash till elliptisk kurva (hash-to-curve) visar sig vara s\u00e5rbar f\u00f6r attacker genom att sp\u00e5ra informationens kvarh\u00e5llande i processor-cacheminnet (cache-attack), medan algoritmen f\u00f6r att omvandla hash till grupp (hash-to-group) \u00e4r utsatt f\u00f6r attacker genom att m\u00e4ta operationernas exekveringstid (timing-attack).<\/p>\n<p> F\u00f6r att genomf\u00f6ra attacker via cacheanalys m\u00e5ste angriparen ha m\u00f6jlighet att k\u00f6ra oprivilegierad kod p\u00e5 anv\u00e4ndarens system som ansluter till det tr\u00e5dl\u00f6sa n\u00e4tverket. B\u00e5da metoderna ger m\u00f6jlighet att f\u00e5 information som \u00e4r n\u00f6dv\u00e4ndig f\u00f6r att klarg\u00f6ra valet av delar av l\u00f6senordet under processen f\u00f6r att kn\u00e4cka det. Effektiviteten av attacken \u00e4r tillr\u00e4ckligt h\u00f6g och g\u00f6r det m\u00f6jligt att kn\u00e4cka ett 8-teckens l\u00f6senord, inklusive sm\u00e5 bokst\u00e4ver, genom att f\u00e5nga endast 40 handskakningssessioner och spendera resurser motsvarande hyra av Amazon EC2-kapacitet f\u00f6r 125 dollar. <\/p>\n<p>Baserat p\u00e5 identifierade s\u00e5rbarheter har flera attackscenarier f\u00f6reslagits:<\/p>\n<ul>\n<li class=\"l\"> Rollbackattack p\u00e5 WPA2 med m\u00f6jlighet f\u00f6r ordlistes\u00f6kning. Under f\u00f6ruts\u00e4ttning att b\u00e5de klienten och \u00e5tkomstpunkten st\u00f6der b\u00e5de WPA3 och WPA2 kan angriparen st\u00e4lla upp en egen falsk \u00e5tkomstpunkt med samma n\u00e4tverksnamn som enbart st\u00f6der WPA2. I en s\u00e5dan situation kommer klienten att anv\u00e4nda den typiska WPA2-metoden f\u00f6r anslutningshandshake, d\u00e4r det kommer att fastst\u00e4llas att en s\u00e5dan nedgradering inte \u00e4r till\u00e5ten, men detta kommer att ske i ett skede d\u00e4r meddelanden om kanal-ackreditering redan har skickats och all n\u00f6dv\u00e4ndig information f\u00f6r en ordlistaattack redan har l\u00e4ckt. En liknande metod \u00e4r till\u00e4mplig f\u00f6r nedgradering till problematiska versioner av elliptiska kurvor i SAE.\n<p>Dessutom har det uppt\u00e4ckts att demon iwd, som utvecklas av Intel som ett alternativ till wpa_supplicant, och det tr\u00e5dl\u00f6sa stacken i Samsung Galaxy S10 \u00e4r s\u00e5rbara f\u00f6r nedgraderingsattacker \u00e4ven i n\u00e4tverk som endast anv\u00e4nder WPA3 \u2014 om dessa enheter tidigare har anslutit till ett WPA3-n\u00e4tverk, kommer de att f\u00f6rs\u00f6ka ansluta till en falsk WPA2-n\u00e4tverksanslutning med samma namn.<\/p>\n<li class=\"l\"> Attack through side channels extracting information from the processor cache. The password encoding algorithm in Dragonfly contains conditional branching, and an attacker, having the ability to execute code in the user\u2019s wireless network system, can determine which block from the if-then-else expression has been selected based on cache behavior analysis. The obtained information can be used for performing a successive password guessing attack, employing methods similar to offline dictionary attacks on WPA2 passwords. It is recommended to switch to operations with constant execution time, independent of the nature of the processed data;\n<li class=\"l\"> Attack through side channels assessing the execution time of operations. In the Dragonfly code for password encoding, several multiplicative groups (MODP) and a variable number of iterations are used, the number of which depends on the password being used and the MAC address of the access point or client. A remote attacker can determine how many iterations were performed during password encoding and use them as a criterion for successive password guessing.\n<li class=\"l\"> Denial-of-service attack. An attacker can block certain functions of the access point due to resource exhaustion by sending a large number of connection negotiation requests. To bypass the flood protection provided in WPA3, it is sufficient to send requests from fictitious unique MAC addresses.\n<li class=\"l\">  Rollback to less secure cryptographic groups used during connection negotiation in WPA3. For example, if a client supports the elliptic curves P-521 and P-256, and uses P-521 as a preferred option, the attacker, regardless of whether P-521 is supported on the access point side, can force the client to use P-256. The attack is carried out by filtering out some messages during the connection negotiation process and sending fake messages indicating the lack of support for certain types of elliptic curves.<br \/>\nTo check devices for vulnerabilities, several scripts with examples of attacks have been prepared:<\/p>\n<\/ul>\n<p>Dragonslayer \u2014 implementation of attacks on EAP-pwd;<\/p>\n<ul>\n<li class=\"l\"> Dragonslayer \u2014 en implementering av attacker p\u00e5 EAP-pwd;\n<li class=\"l\"> Dragondrain \u2014 ett verktyg f\u00f6r att kontrollera s\u00e5rbarheten hos \u00e5tkomstpunkter i implementationen av anslutningsf\u00f6rhandlingsmetoden SAE (Simultaneous Authentication of Equals), som kan anv\u00e4ndas f\u00f6r att initiera en tj\u00e4nsteavbrott;\n<li class=\"l\"> Dragontime \u2014 ett skript f\u00f6r att genomf\u00f6ra attacker via sidokanaler mot SAE, som tar h\u00e4nsyn till skillnader i bearbetningstid av operationer vid anv\u00e4ndning av MODP-grupper 22, 23 och 24;\n<li class=\"l\"> Dragonforce \u2014 ett verktyg f\u00f6r att \u00e5terst\u00e4lla information (l\u00f6senordsuppskattning) baserat p\u00e5 information om olika bearbetningstider av operationer eller identifiering av data som sitter i cache.\n<\/ul>\n<p>Wi-Fi Alliance, som utvecklar standarder f\u00f6r tr\u00e5dl\u00f6sa n\u00e4tverk, har meddelat att problemet ber\u00f6r ett begr\u00e4nsat antal tidiga implementationer av WPA3-Personal och kan l\u00f6sas genom firmware- och programvaruuppdateringar. Det har inte rapporterats n\u00e5gra fall av utnyttjande av s\u00e5rbarheter f\u00f6r skadliga syften. F\u00f6r att st\u00e4rka skyddet har Wi-Fi Alliance i den tr\u00e5dl\u00f6sa enhetscertifieringsprogrammet lagt till ytterligare tester f\u00f6r att kontrollera korrektheten i implementationerna och har kontaktat enhetstillverkare f\u00f6r samordning av avhj\u00e4lpande \u00e5tg\u00e4rder. Patcher f\u00f6r att \u00e5tg\u00e4rda problemen har redan sl\u00e4ppts f\u00f6r hostap\/wpa_supplicant. Paketuppdateringar finns tillg\u00e4ngliga f\u00f6r Ubuntu. I Debian, RHEL, SUSE\/openSUSE, Arch, Fedora och FreeBSD kvarst\u00e5r problemen ol\u00f6sta.<br \/>\n<br \/>K\u00e4lla: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=50493\">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 \u0441 WPA2, \u0438 \u042d\u044f\u043b\u044c \u0420\u043e\u043d\u0435\u043d (Eyal Ronen), \u0441\u043e\u0430\u0432\u0442\u043e\u0440 \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0430\u0442\u0430\u043a \u043d\u0430 TLS, \u0440\u0430\u0441\u043a\u0440\u044b\u043b\u0438 \u0441\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u043e \u0448\u0435\u0441\u0442\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044f\u0445 (CVE-2019-9494 &#8212; CVE-2019-9499) \u0432 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0438 \u0437\u0430\u0449\u0438\u0442\u044b \u0431\u0435\u0441\u043f\u0440\u043e\u0432\u043e\u0434\u043d\u044b\u0445 \u0441\u0435\u0442\u0435\u0439 WPA3, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0445 \u0432\u043e\u0441\u0441\u043e\u0437\u0434\u0430\u0442\u044c \u043f\u0430\u0440\u043e\u043b\u044c \u043f\u043e\u0434\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u044f \u0438 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u0434\u043e\u0441\u0442\u0443\u043f \u043a \u0431\u0435\u0441\u043f\u0440\u043e\u0432\u043e\u0434\u043d\u043e\u0439 \u0441\u0435\u0442\u0438 \u0431\u0435\u0437 \u0437\u043d\u0430\u043d\u0438\u044f \u043f\u0430\u0440\u043e\u043b\u044f. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u0435\u043d\u044b \u043f\u043e\u0434 \u043a\u043e\u0434\u043e\u0432\u044b\u043c \u0438\u043c\u0435\u043d\u0435\u043c Dragonblood [&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":[702],"tags":[],"class_list":["post-31424","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - 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CVE-2019-9499) \u0432.\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/prohoster.info\/sv\/blog\/news\/uyazvimosti-v-tehnologii-zashhity-besprovodnyh-setej-wpa3-i-v-eap-pwd\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg\" \/>\n\t\t<meta property=\"og:image:width\" content=\"350\" \/>\n\t\t<meta property=\"og:image:height\" content=\"350\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2019-10-31T18:41:11+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2019-10-31T18:41:11+00:00\" \/>\n\t\t<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"\ud83e\udd47S\u00e5rbarheter i skyddstekniken f\u00f6r tr\u00e5dl\u00f6sa n\u00e4tverk WPA3 och i EAP-pwd | ProHoster","description":"Mathy Vanhoef, skaparen av KRACK-attacken mot tr\u00e5dl\u00f6sa n\u00e4tverk med WPA2, och Eyal Ronen, medf\u00f6rfattare till vissa attacker mot TLS, har avsl\u00f6jat information om sex s\u00e5rbarheter (CVE-2019-9494 - CVE-2019-9499) i.","canonical_url":"https:\/\/prohoster.info\/sv\/blog\/news\/uyazvimosti-v-tehnologii-zashhity-besprovodnyh-setej-wpa3-i-v-eap-pwd","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"sv_SE","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0438 \u0437\u0430\u0449\u0438\u0442\u044b \u0431\u0435\u0441\u043f\u0440\u043e\u0432\u043e\u0434\u043d\u044b\u0445 \u0441\u0435\u0442\u0435\u0439 WPA3 \u0438 \u0432 EAP-pwd | ProHoster","og:description":"\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 \u0441 WPA2, \u0438 \u042d\u044f\u043b\u044c \u0420\u043e\u043d\u0435\u043d (Eyal Ronen), \u0441\u043e\u0430\u0432\u0442\u043e\u0440 \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0430\u0442\u0430\u043a \u043d\u0430 TLS, \u0440\u0430\u0441\u043a\u0440\u044b\u043b\u0438 \u0441\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u043e \u0448\u0435\u0441\u0442\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044f\u0445 (CVE-2019-9494 - 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