{"id":115832,"date":"2024-05-16T14:59:26","date_gmt":"2024-05-16T12:59:27","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/ataka-ssid-confusion-pozvolyayushhaya-podmenit-set-wi-fi"},"modified":"2024-05-16T14:59:26","modified_gmt":"2024-05-16T12:59:27","slug":"ataka-ssid-confusion-pozvolyayushhaya-podmenit-set-wi-fi","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/ataka-ssid-confusion-pozvolyayushhaya-podmenit-set-wi-fi","title":{"rendered":"\u00datok SSID Confusion, kter\u00fd umo\u017e\u0148uje podvod s Wi-Fi s\u00edt\u00ed","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Skupina v\u00fdzkumn\u00edk\u016f z Katolick\u00e9 univerzity v Leuvenu (Belgie) zjistila architektonickou zranitelnost (CVE-2023-52424) ve standardu Wi-Fi IEEE 802.11, kter\u00e1 umo\u017e\u0148uje p\u0159ipojit se k m\u00e9n\u011b zabezpe\u010den\u00e9 bezdr\u00e1tov\u00e9 s\u00edti m\u00edsto d\u016fv\u011bryhodn\u00e9 s\u00edt\u011b, ke kter\u00e9 se u\u017eivatel zam\u00fd\u0161lel p\u0159ipojit. Pot\u00e9 lze zachytit a manipulovat s provozem. Probl\u00e9m se projevuje v bezdr\u00e1tov\u00fdch prototypech v\u0161ech opera\u010dn\u00edch syst\u00e9m\u016f a t\u00fdk\u00e1 se metod autentizace WPA3, WEP, EAP, AMPE a FILS.    <\/p>\n<p>Navrhovan\u00e1 technika \u00fatoku, kter\u00e1 byla pojmenov\u00e1na SSID Confusion, umo\u017e\u0148uje obej\u00edt p\u0159\u00edtomn\u00e9 metody autentizace p\u0159\u00edstupov\u00fdch bod\u016f v protokolu, kter\u00e9 chr\u00e1n\u00ed p\u0159ed podvr\u017een\u00edm identifik\u00e1tor\u016f s\u00edt\u011b SSID a neumo\u017e\u0148uj\u00ed vytv\u00e1\u0159et fale\u0161n\u00e9 s\u00edt\u011b s n\u00e1zvem s\u00edt\u011b, k n\u00ed\u017e se klient p\u0159ipojuje. P\u0159\u00ed\u010dinou probl\u00e9mu je definice v norm\u011b situac\u00ed, kdy m\u016f\u017ee b\u00fdt SSID neautentizov\u00e1no. Zejm\u00e9na pro ozna\u010den\u00ed sv\u00e9 p\u0159\u00edtomnosti p\u0159\u00edstupov\u00fd bod v \u0161irokop\u00e1smov\u00e9m re\u017eimu vys\u00edl\u00e1 beaconov\u00e9 r\u00e1mce, kter\u00e9 obsahuj\u00ed informace o SSID s\u00edt\u011b. Pro usnadn\u011bn\u00ed procesu vyhled\u00e1v\u00e1n\u00ed s\u00edt\u011b klienti neautentizuj\u00ed SSID v t\u011bchto r\u00e1mc\u00edch, proto\u017ee je p\u0159edpokl\u00e1d\u00e1no, \u017ee kontrola bude vy\u017eadov\u00e1na a\u017e pot\u00e9, co se klient rozhodne p\u0159ipojit k s\u00edti.    <\/p>\n<p>Pro \u00fasp\u011b\u0161n\u00e9 proveden\u00ed \u00fatoku je t\u0159eba, aby u\u017eivatel inicioval p\u0159ipojen\u00ed k ur\u010dit\u00e9 bezdr\u00e1tov\u00e9 s\u00edti a pobl\u00ed\u017e byla jin\u00e1 bezdr\u00e1tov\u00e1 s\u00ed\u0165 s t\u00fdmi\u017e parametry p\u0159ipojen\u00ed jako v prvn\u00ed s\u00edti. Takov\u00e9to praktiky se nap\u0159\u00edklad uplat\u0148uj\u00ed, kdy\u017e jsou pro p\u00e1sma 2.4GHz a 5GHz vytv\u00e1\u0159eny r\u016fzn\u00e9 s\u00edt\u011b, z nich\u017e jedna je slab\u011b chr\u00e1n\u011bna a zraniteln\u00e1 v\u016f\u010di b\u011b\u017en\u00fdm \u00fatok\u016fm na zachycen\u00ed provozu, jako je KRACK nebo Frag. Problematick\u00e1 konfigurace se tak\u00e9 pou\u017e\u00edv\u00e1 v n\u011bkter\u00fdch univerzitn\u00edch s\u00edt\u00edch, kter\u00e9 podporuj\u00ed slu\u017ebu Eduroam. \u00dato\u010dn\u00edk mus\u00ed b\u00fdt v dosahu sign\u00e1lu, aby se mohl vm\u00edsit mezi u\u017eivatele a c\u00edlovou s\u00ed\u0165 (MitM). K proveden\u00ed \u00fatoku \u00fato\u010dn\u00edkovi nen\u00ed t\u0159eba zn\u00e1t p\u0159ihla\u0161ovac\u00ed \u00fadaje ob\u011bti.        <\/p>\n<p>\u00datok spo\u010d\u00edv\u00e1 ve vytvo\u0159en\u00ed p\u0159\u00edstupov\u00e9ho bodu \u00fato\u010dn\u00edkem (WrongAP na diagramu), kter\u00fd na jin\u00e9m kan\u00e1lu zaji\u0161\u0165uje p\u0159enos po\u017eadavk\u016f do m\u00e9n\u011b chr\u00e1n\u011bn\u00e9 podvodn\u00e9 s\u00edt\u011b (WrongNet), ke kter\u00e9 se m\u00e1 klient p\u0159ipojit m\u00edsto po\u017eadovan\u00e9 s\u00edt\u011b (TrustedNet). P\u0159\u00edstupov\u00fd bod m\u016f\u017ee b\u00fdt vytvo\u0159en na b\u011b\u017en\u00e9m notebooku a pou\u017e\u00edv\u00e1 se k organizaci v\u00edcestup\u0148ov\u00e9ho MitM \u00fatoku na ob\u011b\u0165 (MC MitM). \u00datok prob\u00edh\u00e1 ve t\u0159ech f\u00e1z\u00edch:    <\/p>\n<li class=\"l\"> Definice s\u00edt\u011b (Network Discovery). Syst\u00e9m MitM zachycuje pakety, kter\u00e9 ob\u011b\u0165 pos\u00edl\u00e1 do vzduchu, a d\u016fv\u011bryhodn\u00e9 p\u0159\u00edstupov\u00e9 m\u00edsto (TrustedNet), a nahrazuje v nich SSID \u2014 v paketech od p\u0159\u00edstupov\u00e9ho m\u00edsta je SSID nahrazeno identifik\u00e1torem m\u00e9n\u011b zabezpe\u010den\u00e9 s\u00edt\u011b, a v odpov\u011bd\u00edch ob\u011bti je nahrazeno skute\u010dn\u00fdm, aby se simulovala interakce klienta a d\u016fv\u011bryhodn\u00e9ho p\u0159\u00edstupov\u00e9ho m\u00edsta. Nakonec za\u0159\u00edzen\u00ed ob\u011bti obdr\u017e\u00ed odpov\u011bdi a domn\u00edv\u00e1 se, \u017ee po\u017eadovan\u00e1 s\u00ed\u0165 je v okol\u00ed, i kdy\u017e tyto odpov\u011bdi p\u0159en\u00e1\u0161\u00ed p\u0159\u00edstupov\u00e9 m\u00edsto \u00fato\u010dn\u00edka.\n<li class=\"l\"> Zachycen\u00ed autentizace (Authentication hijacking). \u00dato\u010dn\u00edk simuluje \u00fasp\u011b\u0161nou autentizaci a nut\u00ed klienta, aby se p\u0159ipojil k m\u00e9n\u011b chr\u00e1n\u011bn\u00e9 s\u00edti, m\u00edsto k d\u016fv\u011bryhodn\u00e9. Jak v p\u0159edchoz\u00ed f\u00e1zi, \u00fato\u010dn\u00edk zachycuje r\u00e1mce odes\u00edlan\u00e9 p\u0159i autentizaci klientem, nahrazuje v nich SSID a op\u011btovn\u011b je odes\u00edl\u00e1 p\u0159\u00edstupov\u00e9mu bodu.\n<li class=\"l\"> MitM. Po dohod\u011b kan\u00e1lu komunikace \u00fato\u010dn\u00edk m\u011bn\u00ed SSID z WrongNet na TrustedNet, \u010d\u00edm\u017e vytv\u00e1\u0159\u00ed dojem, \u017ee u\u017eivatel pracuje prost\u0159ednictv\u00edm d\u016fv\u011bryhodn\u00e9 s\u00edt\u011b a ne prost\u0159ednictv\u00edm m\u00e9n\u011b chr\u00e1n\u011bn\u00e9 s\u00edt\u011b.                                      <center><img decoding=\"async\" alt=\"\u00datok SSID Confusion, kter\u00fd umo\u017e\u0148uje podvod s Wi-Fi s\u00edt\u00ed\" src=\"\/wp-content\/uploads\/2024\/05\/61f99d8f551828c4300bd9b1b498617a.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/center>\n<p>Vyu\u017eit\u00edm zranitelnosti m\u016f\u017ee \u00fato\u010dn\u00edk donutit klienta p\u0159ipojit se k m\u00e9n\u011b chr\u00e1n\u011bn\u00e9 s\u00edti, p\u0159i\u010dem\u017e se v rozhran\u00ed bude zobrazovat SSID s\u00edt\u011b, k n\u00ed\u017e se p\u016fvodn\u011b cht\u011bl u\u017eivatel p\u0159ipojit, a ne t\u00e9, ke kter\u00e9 je vlastn\u011b p\u0159ipojen. Kdy\u017e dojde k p\u0159ipojen\u00ed u\u017eivatele p\u0159es nezabezpe\u010denou s\u00ed\u0165, m\u016f\u017ee \u00fato\u010dn\u00edk analyzovat a zasahovat do neza\u0161ifrovan\u00fdch tok\u016f provozu. P\u0159itom p\u0159i pou\u017eit\u00ed n\u011bkter\u00fdch <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/cs\/vpn\/\"   title=\"VPN\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"142\">VPN<\/a>, jako je WARP, hide.me a Windscribe, VPN nebude aktivov\u00e1n p\u0159i p\u0159ipojen\u00ed k s\u00edt\u00edm ozna\u010den\u00fdm v nastaven\u00ed jako d\u016fv\u011bryhodn\u00e9.    <\/p>\n<p>\u00datok je aplikovateln\u00fd na protokoly bezdr\u00e1tov\u00e9 autentizace vyu\u017e\u00edvaj\u00edc\u00ed EAP (Extensible Authentication Protocol), SAE (Simultaneous Authentication of Equals) a 802.1X, jako\u017e i v voliteln\u00e9m re\u017eimu provozu protokolu WPA3, kde se SSID nepou\u017e\u00edv\u00e1 p\u0159i vytv\u00e1\u0159en\u00ed kl\u00ed\u010de PMK (Pairwise Master Key), co\u017e se d\u011bl\u00e1 za \u00fa\u010delem vylou\u010den\u00ed p\u016fvodn\u011b zn\u00e1m\u00fdch dat p\u0159i formov\u00e1n\u00ed kl\u00ed\u010de s c\u00edlem chr\u00e1nit p\u0159ed r\u016fzn\u00fdmi kryptografick\u00fdmi \u00fatoky. Protokol FILS (Fast Initial Link Setup) je zraniteln\u00fd p\u0159i pou\u017eit\u00ed PMK, vytvo\u0159en\u00e9ho p\u0159i dohod\u011b spojen\u00ed na z\u00e1klad\u011b EAP. Protokoly WPA1, WPA2 a FT (Fast BSS Transition) nejsou na tento probl\u00e9m n\u00e1chyln\u00e9, proto\u017ee vy\u017eaduj\u00ed spr\u00e1vn\u00e9 SSID p\u0159i dohod\u011b spojen\u00ed.      <\/p>\n<p>Pro ochranu proti \u00fatoku SSID Confusion na stran\u011b p\u0159\u00edstupov\u00e9ho bodu se uv\u00e1d\u00ed zahrnut\u00ed do standardu 802.11 po\u017eadavku na autentizaci SSID p\u0159i p\u0159ipojen\u00ed, co\u017e m\u016f\u017ee b\u00fdt realizov\u00e1no p\u0159id\u00e1n\u00edm SSID do funkce formov\u00e1n\u00ed kl\u00ed\u010de nebo zahrnut\u00edm SSID mezi dal\u0161\u00ed data kontrolovan\u00e1 b\u011bhem dohod\u011b spojen\u00ed. Na stran\u011b klienta m\u016f\u017ee b\u00fdt ochrana zaji\u0161t\u011bna prost\u0159ednictv\u00edm zabezpe\u010den\u00ed beaconov\u00fdch r\u00e1mc\u016f (bude aplikov\u00e1no ve WiFi 7). Tvo\u0159itel\u00e9 s\u00edt\u00ed mohou zabr\u00e1nit \u00fatoku t\u00edm, \u017ee se vzdaj\u00ed pou\u017e\u00edv\u00e1n\u00ed spole\u010dn\u00fdch p\u0159ihla\u0161ovac\u00edch \u00fadaj\u016f v s\u00edt\u00edch s r\u016fzn\u00fdmi SSID. U\u017eivatel\u00e9 se mohou chr\u00e1nit pou\u017e\u00edv\u00e1n\u00edm spolehliv\u00fdch VPN p\u0159i p\u0159ipojen\u00ed p\u0159es jak\u00e9koliv bezdr\u00e1tov\u00e9 s\u00edt\u011b.          <center><div class=\"youtube-placeholder\" data-id=\"VKJwek9eCig\" onclick=\"loadVideo(this)\">\r\n        <img decoding=\"async\" src=\"https:\/\/img.youtube.com\/vi\/VKJwek9eCig\/hqdefault.jpg\" alt=\"P\u0159ehr\u00e1t video\" loading=\"lazy\" width=\"480\" height=\"360\" style=\"width:100%;height:auto;\">\r\n        <div class=\"play-button\"><\/div>\r\n    <\/div><\/center><br \/>\n<br \/>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=61189\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0413\u0440\u0443\u043f\u043f\u0430 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u0438\u0437 \u041b\u0451\u0432\u0435\u043d\u0441\u043a\u043e\u0433\u043e \u043a\u0430\u0442\u043e\u043b\u0438\u0447\u0435\u0441\u043a\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 (\u0411\u0435\u043b\u044c\u0433\u0438\u044f), \u0432\u044b\u044f\u0432\u0438\u043b\u0430 \u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u043d\u0443\u044e \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2023-52424) \u0432 \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u0435 Wi-Fi IEEE 802.11, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0443\u044e \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u043e\u0432\u0430\u0442\u044c \u043f\u043e\u0434\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435 \u043a \u043c\u0435\u043d\u0435\u0435 \u0437\u0430\u0449\u0438\u0449\u0451\u043d\u043d\u043e\u0439 \u0431\u0435\u0441\u043f\u0440\u043e\u0432\u043e\u0434\u043d\u043e\u0439 \u0441\u0435\u0442\u0438, \u0432\u043c\u0435\u0441\u0442\u043e \u0437\u0430\u0441\u043b\u0443\u0436\u0438\u0432\u0430\u044e\u0449\u0435\u0439 \u0434\u043e\u0432\u0435\u0440\u0438\u044f \u0441\u0435\u0442\u0438, \u043a \u043a\u043e\u0442\u043e\u0440\u043e\u0439 \u043d\u0430\u043c\u0435\u0440\u0435\u0432\u0430\u043b\u0441\u044f \u043f\u043e\u0434\u043a\u043b\u044e\u0447\u0438\u0442\u044c\u0441\u044f \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044c, \u043f\u043e\u0441\u043b\u0435 \u0447\u0435\u0433\u043e \u043c\u043e\u0436\u043d\u043e \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u043e\u0432\u0430\u0442\u044c \u043f\u0435\u0440\u0435\u0445\u0432\u0430\u0442 \u0438 \u043c\u0430\u043d\u0438\u043f\u0443\u043b\u044f\u0446\u0438\u0438 \u0442\u0440\u0430\u0444\u0438\u043a\u043e\u043c. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0432 \u0431\u0435\u0441\u043f\u0440\u043e\u0432\u043e\u0434\u043d\u044b\u0445 \u0441\u0442\u0435\u043a\u0430\u0445 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