{"id":1112,"date":"2010-08-01T23:30:02","date_gmt":"2010-08-01T23:30:02","guid":{"rendered":"http:\/\/nethemba.com\/sk\/wpa2-hole-196-alebo-o-co-presne-ide\/"},"modified":"2010-08-01T23:30:02","modified_gmt":"2010-08-01T23:30:02","slug":"wpa2-hole-196-alebo-o-co-presne-ide","status":"publish","type":"post","link":"https:\/\/nethemba.com\/sk\/wpa2-hole-196-alebo-o-co-presne-ide\/","title":{"rendered":"WPA2 Hole 196 alebo o \u010do presne ide"},"content":{"rendered":"<p>Bezpe\u010dnostn\u00ed v\u00fdskumn\u00edci z AirTight Security objavili <a href=\"http:\/\/www.airtightnetworks.com\/WPA2-Hole196\">zauj\u00edmav\u00fa bezpe\u010dnostn\u00fa zranite\u013enos\u0165<\/a> t\u00fdkaj\u00facu sa WPA\/WPA2\u00a0\u0161ifrovania bezdr\u00f4tov\u00fdch wifi siet\u00ed. Predt\u00fdm ako sa pust\u00edm do trochu technickej\u0161\u00edch detailov, r\u00e1d by som na za\u010diatku zd\u00f4raznil:<\/p>\n<ul>\n<li><strong>nejde o prelomenie WPA2 v zmysle odhalenia priv\u00e1tneho k\u013e\u00fa\u010da, teda prienik zvonku do vn\u00fatra \u0161ifrovanej WPA2 siete<\/strong><\/li>\n<li><strong>\u00fatok sa t\u00fdka len WPA\/WPA2\u00a0Enterprise (korpor\u00e1tne wifi prostredie), mus\u00ed by\u0165 pou\u017eit\u00fd EAP\u00a0(nie PSK)<\/strong><\/li>\n<li><strong>ide o tzv. &#8222;insider&#8220; \u00fatok zvn\u00fatra, \u00fato\u010dn\u00edk mus\u00ed by\u0165 legit\u00edmne 802.1x autentifikovan\u00fd do \u0161ifrovanej WPA\/WPA2 siete a mus\u00ed pou\u017e\u00edva\u0165 rovnak\u00e9 ESSID ako obe\u0165<\/strong><\/li>\n<\/ul>\n<p>A\u017e vtedy je mo\u017en\u00e9 realizova\u0165 <a href=\"http:\/\/en.wikipedia.org\/wiki\/Man-in-the-middle_attack\">MITM \u00fatok<\/a>, teda kompletne odpo\u010d\u00fava\u0165 a upravova\u0165 komunik\u00e1ciu medzi legitimn\u00fdmi stanicami WPA\/WPA2 siete a samotn\u00fdm AP.<\/p>\n<p>Z h\u013eadiska zneu\u017eitia sa to d\u00e1 porovna\u0165 najsk\u00f4r s <a href=\"http:\/\/en.wikipedia.org\/wiki\/ARP_spoofing\">ARP cache spoofing\/poisoning \u00fatokom<\/a> na linkovej vrstve, kedy \u00fato\u010dn\u00edk dok\u00e1\u017ee podvrhn\u00fa\u0165 na linkovej vrstve vlastn\u00fa &#8222;default&#8220; br\u00e1nu a cez \u0148u smerova\u0165 klientov danej siete (do danej siete mus\u00ed ma\u0165 ale fyzick\u00fd pr\u00edstup, resp. pr\u00edstup na linkovu vrstvu).<\/p>\n<p>Najsk\u00f4r si stru\u010dne vysvetlime ako vyzer\u00e1 samotn\u00e1 autentifik\u00e1cia medzi klientskou stanicou a AP v pr\u00edpade WPA\/WPA2:<\/p>\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/a\/ac\/4-way-handshake.svg\/400px-4-way-handshake.svg.png\" alt=\"\" \/><\/p>\n<p>EAP\u00a0autenfik\u00e1ciou (PEAP, EAP-TLS, EAP-TTLS, ..) z\u00edskame (na strane stanice a\u00a0AP) zdie\u013ean\u00fd priv\u00e1tny k\u013e\u00fa\u010d PMK (Pairwise Master Key). Potom nasleduje tzv. &#8222;4-way handshake&#8220; (4-cestn\u00e1 v\u00fdmena) medzi stanicou a AP z ktorej sa vygeneruje tzv. PTK k\u013e\u00fa\u010d (Pairwise Transient Key) &#8211; tento k\u013e\u00fa\u010d sa generuje tak, \u017ee sa posp\u00e1jaj\u00fa nasleduj\u00face atrib\u00faty:\u00a0PMK\u00a0(z\u00edskan\u00fd predt\u00fdm z\u00a0EAP), ANonce (n\u00e1hodne \u010dslo vygenerovan\u00e9 AP), SNonce (n\u00e1hodne \u010d\u00edslo vygenerovan\u00e9 stanicou), MAC adresa AP a MAC\u00a0adresu samotnej stanice, z tohto v\u0161etk\u00e9ho sa vytvor\u00ed e\u0161te kryptografick\u00fd siln\u00fd hash. Samotn\u00fd PTK sa potom pou\u017e\u00edva na \u0161ifrovanie samotnej unicastovej komunik\u00e1cie (medzi stanicou a AP). To, \u017ee je MAC adresa stanice zahrnut\u00e1 pri generovan\u00ed PTK zabezpe\u010duje ochranu vo\u010di spofovaniu MAC adresy stanice.<\/p>\n<p>T\u00fato vlastnos\u0165 ale nem\u00e1 GTK k\u013e\u00fa\u010d, ktor\u00fd sa pou\u017e\u00edva na \u0161ifrovanie multicastovej a broadcastovej komunik\u00e1cie\u00a0(na hromadn\u00e9 oslovenie v\u0161etk\u00fdch klientov, ktor\u00ed pou\u017e\u00edvaj\u00fa dan\u00fd ESSID), je to dokonca ofici\u00e1lne uveden\u00e9 priamo v \u0161pecifik\u00e1cii <a href=\"http:\/\/standards.ieee.org\/getieee802\/download\/802.11-2007.pdf\">\u0161tandardu IEEE 802.11<\/a> konkr\u00e9tne na strane \u010d\u00edslo 196 pod\u013ea ktorej sa dan\u00fd \u00fatok vol\u00e1:<\/p>\n<p><code>RSNA defines two key hierarchies:<br \/>\na) Pairwise key hierarchy, to protect unicast traffic<br \/>\nb) GTK, a hierarchy consisting of a single key to protect multicast and broadcast traffic<br \/>\nNOTE\u2014Pairwise key support with TKIP or CCMP allows a receiving STA to detect MAC address spoofing<br \/>\nand data forgery. The RSNA architecture binds the transmit and receive addresses to the pairwise key. If an<br \/>\nattacker creates an MPDU with the spoofed TA, then the decapsulation procedure at the receiver will generate<br \/>\nan error. <\/code><strong><code>GTKs do not have this property.<\/code><\/strong><\/p>\n<p>V praxi to znamen\u00e1, \u017ee \u00fato\u010dn\u00edk m\u00f4\u017ee vytvori\u0165 vlastn\u00fd GTK broadcast r\u00e1mec s podvrhnutou\u00a0(naspoofovanou) MAC adresou AP, posla\u0165 ho v\u0161etk\u00fdm klientom a vyd\u00e1va\u0165 sa za p\u00f4vodn\u00e9 AP (pri\u010dom samotn\u00e9 wifi stanice to nespoznaj\u00fa).<\/p>\n<p><strong>Z\u00e1ver:\u00a0<\/strong><\/p>\n<p>Ide v ka\u017edom pr\u00edpade o zauj\u00edmav\u00fd druh \u00fatoku na ktor\u00fd sa da pr\u00eds\u0165 len detailn\u00fdm \u0161tudovan\u00edm existuj\u00facich \u0161tandardov, je ale obmedzen\u00fd na korpor\u00e1tnu wifi sie\u0165 a intern\u00fdch \u00fato\u010dn\u00edkov, ktor\u00ed do nej musia ma\u0165 legit\u00edmny 802.1x pr\u00edstup (obvykle tak\u00edto \u00fato\u010dn\u00edci maj\u00fa aj fyzick\u00fd pr\u00edstup k dr\u00f4tovej sieti, kedy dok\u00e1\u017eu realizova\u0165 \u00faspe\u0161n\u00fd ARP cache spoofing\/poisoning \u00fatok, na ktor\u00fd existuj\u00fa u\u017e <a href=\"http:\/\/ettercap.sourceforge.net\/\">funk\u010dn\u00e9 n\u00e1stroje<\/a>).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Bezpe\u010dnostn\u00ed v\u00fdskumn\u00edci z AirTight Security objavili zauj\u00edmav\u00fa bezpe\u010dnostn\u00fa zranite\u013enos\u0165 t\u00fdkaj\u00facu sa WPA\/WPA2\u00a0\u0161ifrovania bezdr\u00f4tov\u00fdch wifi siet\u00ed. Predt\u00fdm ako sa pust\u00edm do trochu technickej\u0161\u00edch detailov, r\u00e1d by som na za\u010diatku zd\u00f4raznil: nejde o prelomenie WPA2 v zmysle odhalenia priv\u00e1tneho k\u013e\u00fa\u010da, teda prienik zvonku do vn\u00fatra \u0161ifrovanej WPA2 siete \u00fatok sa t\u00fdka len WPA\/WPA2\u00a0Enterprise (korpor\u00e1tne wifi prostredie), mus\u00ed [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[13],"tags":[339,340,208,88,341],"class_list":["post-1112","post","type-post","status-publish","format-standard","hentry","category-uncategorized-sk","tag-802-1x-sk","tag-hole-196-sk","tag-mitm-sk","tag-nethemba-sk","tag-wpa2-utok-sk"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>WPA2 Hole 196 alebo o \u010do presne ide - Nethemba<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/nethemba.com\/sk\/wpa2-hole-196-alebo-o-co-presne-ide\/\" \/>\n<meta property=\"og:locale\" content=\"sk_SK\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"WPA2 Hole 196 alebo o \u010do presne ide - Nethemba\" \/>\n<meta property=\"og:description\" content=\"Bezpe\u010dnostn\u00ed v\u00fdskumn\u00edci z AirTight Security objavili zauj\u00edmav\u00fa bezpe\u010dnostn\u00fa zranite\u013enos\u0165 t\u00fdkaj\u00facu sa WPA\/WPA2\u00a0\u0161ifrovania bezdr\u00f4tov\u00fdch wifi siet\u00ed. 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