{"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\/hu\/blog\/news\/ataka-ssid-confusion-pozvolyayushhaya-podmenit-set-wi-fi","title":{"rendered":"SSID Confusion t\u00e1mad\u00e1s, amely lehet\u0151v\u00e9 teszi a Wi-Fi h\u00e1l\u00f3zatok hamis\u00edt\u00e1s\u00e1t","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>A kutat\u00f3k egy csoportja a Leuveni Katolikus Egyetemr\u0151l (Belgium) egy architektur\u00e1lis sebezhet\u0151s\u00e9get (CVE-2023-52424) t\u00e1rt fel a Wi-Fi IEEE 802.11 szabv\u00e1nyban, amely lehet\u0151v\u00e9 teszi, hogy a felhaszn\u00e1l\u00f3 egy kev\u00e9sb\u00e9 v\u00e9dett vezet\u00e9k n\u00e9lk\u00fcli h\u00e1l\u00f3zathoz csatlakozzon a megb\u00edzhat\u00f3 helyett, amelyhez a felhaszn\u00e1l\u00f3 csatlakozni sz\u00e1nd\u00e9kozott, ezut\u00e1n lehet\u0151s\u00e9g ny\u00edlik a forgalom lehallgat\u00e1s\u00e1ra \u00e9s manipul\u00e1l\u00e1s\u00e1ra. A probl\u00e9ma minden oper\u00e1ci\u00f3s rendszer vezet\u00e9k n\u00e9lk\u00fcli verem\u00e9ben megjelenik \u00e9s \u00e9rinti a WPA3, WEP, EAP, AMPE \u00e9s FILS hiteles\u00edt\u00e9si m\u00f3dszereket.    <\/p>\n<p>A javasolt t\u00e1mad\u00e1si technika, amely az SSID Confusion nevet kapta, lehet\u0151v\u00e9 teszi a hozz\u00e1f\u00e9r\u00e9si pont hiteles\u00edt\u00e9si m\u00f3dszereinek megker\u00fcl\u00e9s\u00e9t, amelyek v\u00e9dik a SSID-h\u00e1l\u00f3zat azonos\u00edt\u00f3j\u00e1nak hamis\u00edt\u00e1s\u00e1val szemben, \u00e9s megakad\u00e1lyozz\u00e1k a hamis h\u00e1l\u00f3zatok l\u00e9trehoz\u00e1s\u00e1t, amelyek ugyanazzal a n\u00e9vvel rendelkeznek, mint a kliens \u00e1ltal csatlakozott h\u00e1l\u00f3zat. A probl\u00e9ma oka a szabv\u00e1nyban szerepl\u0151 olyan helyzetek defini\u00e1l\u00e1sa, amikor az SSID nem hiteles\u00edtett. K\u00fcl\u00f6n\u00f6sen az\u00e9rt, hogy jelezze a jelenl\u00e9t\u00e9t, a hozz\u00e1f\u00e9r\u00e9si pont sz\u00e9lesk\u00f6r\u0171en k\u00f6zvet\u00edtett beacon kereteket k\u00fcld, amelyek tartalmazz\u00e1k az SSID-h\u00e1l\u00f3zatr\u00f3l sz\u00f3l\u00f3 inform\u00e1ci\u00f3kat. A h\u00e1l\u00f3zat keres\u00e9s\u00e9nek megk\u00f6nny\u00edt\u00e9se \u00e9rdek\u00e9ben a kliensek nem hiteles\u00edtik az SSID-t ezekben a keretekben, mivel felt\u00e9telezik, hogy a vizsg\u00e1latot csak akkor kell elv\u00e9gezni, amikor a kliens \u00fagy d\u00f6nt, hogy csatlakozni k\u00edv\u00e1n a h\u00e1l\u00f3zathoz.    <\/p>\n<p>A t\u00e1mad\u00e1s sikeres v\u00e9grehajt\u00e1s\u00e1hoz sz\u00fcks\u00e9ges, hogy a felhaszn\u00e1l\u00f3 elind\u00edtson egy kapcsolatot egy adott vezet\u00e9k n\u00e9lk\u00fcli h\u00e1l\u00f3zathoz, mik\u00f6zben a k\u00f6zelben legyen egy m\u00e1sik vezet\u00e9k n\u00e9lk\u00fcli h\u00e1l\u00f3zat, amely ugyanazokkal a kapcsol\u00f3d\u00e1si param\u00e9terekkel rendelkezik, mint az els\u0151 h\u00e1l\u00f3zat. Ez p\u00e9ld\u00e1ul akkor fordul el\u0151, amikor a 2.4GHz \u00e9s 5GHz s\u00e1vokhoz k\u00fcl\u00f6nb\u00f6z\u0151 h\u00e1l\u00f3zatok j\u00f6nnek l\u00e9tre, az egyik gyeng\u00e9n v\u00e9dett \u00e9s sebezhet\u0151 a forgalom lehallgat\u00e1s\u00e1ra ir\u00e1nyul\u00f3 tipikus t\u00e1mad\u00e1sokkal, p\u00e9ld\u00e1ul a KRACK vagy Frag ellen. A probl\u00e9m\u00e1s konfigur\u00e1ci\u00f3t n\u00e9h\u00e1ny egyetemi h\u00e1l\u00f3zatban is alkalmazz\u00e1k, amelyek t\u00e1mogatj\u00e1k az Eduroam szolg\u00e1ltat\u00e1st. A t\u00e1mad\u00f3nak a felhaszn\u00e1l\u00f3 \u00e9s a c\u00e9lh\u00e1l\u00f3zat k\u00f6z\u00e9 kell ker\u00fclnie (MitM), \u00e9s az t\u00e1mad\u00e1s v\u00e9grehajt\u00e1s\u00e1hoz nem sz\u00fcks\u00e9ges ismernie az \u00e1ldozat hiteles\u00edt\u0151 adatait.        <\/p>\n<p>A t\u00e1mad\u00e1s l\u00e9nyege, hogy a t\u00e1mad\u00f3 egy hozz\u00e1f\u00e9r\u00e9si pontot hoz l\u00e9tre (WrongAP a diagramon), amely egy m\u00e1sik csatorn\u00e1n k\u00f6zvet\u00edti a k\u00e9r\u00e9seket egy gyeng\u00e9bben v\u00e9dett helyettes\u00edt\u0151 h\u00e1l\u00f3zat (WrongNet) fel\u00e9, amelyhez a kliensnek csatlakoznia kell a k\u00edv\u00e1nt h\u00e1l\u00f3zat helyett (TrustedNet). A hozz\u00e1f\u00e9r\u00e9si pont l\u00e9trehozhat\u00f3 egy h\u00e9tk\u00f6znapi laptopon \u00e9s a c\u00e9lpont (MC MitM) t\u00f6bbcsatorn\u00e1s MitM t\u00e1mad\u00e1s\u00e1nak megszervez\u00e9s\u00e9re haszn\u00e1lj\u00e1k. A t\u00e1mad\u00e1s h\u00e1rom l\u00e9p\u00e9sre oszlik.    <\/p>\n<li class=\"l\"> H\u00e1l\u00f3zati felfedez\u00e9s (Network Discovery). A MitM rendszer elfogja az \u00e1ldozat \u00e9s a megb\u00edzhat\u00f3 hozz\u00e1f\u00e9r\u00e9si pont (TrustedNet) \u00e1ltal k\u00fcld\u00f6tt csomagokat, \u00e9s az SSID-t kicser\u00e9li benn\u00fck - a hozz\u00e1f\u00e9r\u00e9si pontt\u00f3l \u00e9rkez\u0151 csomagokban az SSID-t egy kev\u00e9sb\u00e9 v\u00e9dett h\u00e1l\u00f3zat azonos\u00edt\u00f3j\u00e1ra cser\u00e9li, m\u00edg az \u00e1ldozat v\u00e1laszaiban a val\u00f3di SSID-re, hogy szimul\u00e1lja az \u00e1ldozat \u00e9s a megb\u00edzhat\u00f3 hozz\u00e1f\u00e9r\u00e9si pont k\u00f6z\u00f6tti k\u00f6lcs\u00f6nhat\u00e1st. Ennek eredm\u00e9nyek\u00e9nt az \u00e1ldozat eszk\u00f6ze v\u00e1laszokat kap, \u00e9s azt hiszi, hogy a keresett h\u00e1l\u00f3zat a k\u00f6zelben van, annak ellen\u00e9re, hogy ezeket a v\u00e1laszokat a t\u00e1mad\u00f3 hozz\u00e1f\u00e9r\u00e9si pont tov\u00e1bb\u00edtja.\n<li class=\"l\"> Autentik\u00e1ci\u00f3 elfog\u00e1sa (Authentication hijacking). A t\u00e1mad\u00f3 sikeres autentik\u00e1ci\u00f3t szimul\u00e1l, \u00e9s r\u00e1veszi a klienst, hogy csatlakozzon a gyeng\u00e9bben v\u00e9dett h\u00e1l\u00f3zathoz, ahelyett, hogy a megb\u00edzhat\u00f3hoz csatlakozna. Mint az el\u0151z\u0151 szakaszban, a t\u00e1mad\u00f3 elfogja az autentik\u00e1ci\u00f3 sor\u00e1n k\u00fcld\u00f6tt kereteket, megv\u00e1ltoztatja az SSID-t \u00e9s \u00fajra elk\u00fcldi a hozz\u00e1f\u00e9r\u00e9si pontnak.\n<li class=\"l\"> MitM. Miut\u00e1n a kommunik\u00e1ci\u00f3s csatorna l\u00e9trej\u00f6tt, a t\u00e1mad\u00f3 az SSID-t a WrongNet-r\u0151l TrustedNet-re cser\u00e9li, hogy azt a benyom\u00e1st keltse, hogy a felhaszn\u00e1l\u00f3 a megb\u00edzhat\u00f3 h\u00e1l\u00f3zaton kereszt\u00fcl dolgozik, nem pedig a gyeng\u00e9bben v\u00e9dett h\u00e1l\u00f3zaton.                                      <center><img decoding=\"async\" alt=\"SSID Confusion t\u00e1mad\u00e1s, amely lehet\u0151v\u00e9 teszi a Wi-Fi h\u00e1l\u00f3zatok hamis\u00edt\u00e1s\u00e1t\" src=\"\/wp-content\/uploads\/2024\/05\/61f99d8f551828c4300bd9b1b498617a.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/center>\n<p>Kihaszn\u00e1lva a sebezhet\u0151s\u00e9get, a t\u00e1mad\u00f3 r\u00e1 tudja k\u00e9nyszer\u00edteni a klienst, hogy csatlakozzon a gyeng\u00e9bben v\u00e9dett h\u00e1l\u00f3zathoz, mik\u00f6zben az interf\u00e9szen a h\u00e1l\u00f3zat SSID-je fog megjelenni, amelyhez a felhaszn\u00e1l\u00f3 eredetileg csatlakozni akart, nem az, amelyhez val\u00f3j\u00e1ban csatlakozik. Miut\u00e1n siker\u00fclt csatlakoztatnia a felhaszn\u00e1l\u00f3t a nem v\u00e9dett h\u00e1l\u00f3zaton kereszt\u00fcl, a t\u00e1mad\u00f3 k\u00e9pes elemezni \u00e9s beavatkozni a titkos\u00edtatlan forgalmi \u00e1raml\u00e1sokba. Ezen k\u00edv\u00fcl bizonyos esetekben <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/hu\/vpn\/\"   title=\"VPN\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"142\">VPN<\/a>, mint p\u00e9ld\u00e1ul a WARP, hide.me \u00e9s Windscribe, a VPN nem lesz haszn\u00e1lva a megb\u00edzhat\u00f3k\u00e9nt megjel\u00f6lt h\u00e1l\u00f3zatokhoz val\u00f3 csatlakoz\u00e1skor.    <\/p>\n<p>A t\u00e1mad\u00e1s alkalmazhat\u00f3 olyan vezet\u00e9k n\u00e9lk\u00fcli hiteles\u00edt\u00e9si protokollokra, amelyek EAP (Extensible Authentication Protocol), SAE (Simultaneous Authentication of Equals) \u00e9s 802.1X-t haszn\u00e1lnak, valamint a WPA3 protokoll opcion\u00e1lis \u00fczemm\u00f3dj\u00e1ra, ahol az SSID nem haszn\u00e1latos a PMK (Pairwise Master Key) kulcs l\u00e9trehoz\u00e1sakor, ami az\u00e9rt t\u00f6rt\u00e9nik, hogy kiz\u00e1rj\u00e1k az alapb\u00f3l ismert adatokat a kulcs gener\u00e1l\u00e1s\u00e1b\u00f3l a k\u00fcl\u00f6nb\u00f6z\u0151 kriptogr\u00e1fiai t\u00e1mad\u00e1sok v\u00e9delme \u00e9rdek\u00e9ben. A FILS (Fast Initial Link Setup) protokoll sebezhet\u0151, ha az EAP-alap\u00fa kapcsolat sor\u00e1n l\u00e9trehozott PMK-ot haszn\u00e1lnak. A WPA1, WPA2 \u00e9s FT (Fast BSS Transition) protokollok nem szenvednek probl\u00e9m\u00e1t\u00f3l, mivel megfelel\u0151 SSID-t k\u00f6vetelnek meg a kapcsolat egyeztet\u00e9sekor.      <\/p>\n<p>Az SSID Confusion t\u00e1mad\u00e1s ellen a hozz\u00e1f\u00e9r\u00e9si pont oldal\u00e1n megeml\u00edtik az 802.11 szabv\u00e1nyba az SSID hiteles\u00edt\u00e9si k\u00f6vetelm\u00e9nyeinek be\u00e9p\u00edt\u00e9s\u00e9t csatlakoz\u00e1skor, amelyet meg lehet val\u00f3s\u00edtani az SSID hozz\u00e1ad\u00e1s\u00e1val a kulcs gener\u00e1l\u00e1si funkci\u00f3hoz vagy az SSID tov\u00e1bbi adatok k\u00f6z\u00e9 val\u00f3 beilleszt\u00e9s\u00e9vel, amelyeket a kapcsolat egyeztet\u00e9se k\u00f6zben ellen\u0151riznek. A kliens oldal\u00e1n a v\u00e9delem a beacon keretek v\u00e9delm\u00e9nek biztos\u00edt\u00e1s\u00e1val \u00e9rhet\u0151 el (ez alkalmaz\u00e1sra ker\u00fcl a WiFi 7-ben). A h\u00e1l\u00f3zatot l\u00e9trehoz\u00f3k megakad\u00e1lyozhatj\u00e1k a t\u00e1mad\u00e1s elk\u00f6vet\u00e9s\u00e9t, ha elker\u00fclik a k\u00f6z\u00f6s hiteles\u00edt\u0151 adatok haszn\u00e1lat\u00e1t k\u00fcl\u00f6nb\u00f6z\u0151 SSID-vel rendelkez\u0151 h\u00e1l\u00f3zatokban. A felhaszn\u00e1l\u00f3k v\u00e9dhetik magukat megb\u00edzhat\u00f3 VPN haszn\u00e1lat\u00e1val b\u00e1rmely vezet\u00e9k n\u00e9lk\u00fcli h\u00e1lzatra t\u00f6rt\u00e9n\u0151 csatlakoz\u00e1skor.          <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=\"Vide\u00f3 lej\u00e1tsz\u00e1sa\" 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 \/>Forr\u00e1s: <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 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