{"id":31273,"date":"2019-10-31T21:40:23","date_gmt":"2019-10-31T18:40:23","guid":{"rendered":"https:\/\/prohoster.info\/blog\/vzlom-wpa3-dragonblood\/"},"modified":"2019-10-31T21:40:23","modified_gmt":"2019-10-31T18:40:23","slug":"vzlom-wpa3-dragonblood","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/administrirovanie\/vzlom-wpa3-dragonblood","title":{"rendered":"WPA3 felt\u00f6r\u00e9se: DragonBlood","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

\"WPA3
\n
\nB\u00e1r az \u00faj WPA3 standardot m\u00e9g nem vezett\u00e9k be teljes k\u00f6r\u0171en, a protokoll biztons\u00e1gi hi\u00e1nyoss\u00e1gai lehet\u0151v\u00e9 teszik a t\u00e1mad\u00f3k sz\u00e1m\u00e1ra a Wi-Fi jelszavak felt\u00f6r\u00e9s\u00e9t.
\n<\/a><\/noindex>
\nA Wi-Fi Protected Access III (WPA3) protokollt az\u00e9rt ind\u00edtott\u00e1k el, hogy megoldja a WPA2 protokoll technikai hi\u00e1nyoss\u00e1gait, amely hossz\u00fa id\u0151n kereszt\u00fcl biztons\u00e1gosnak \u00e9s a KRACK-t\u00e1mad\u00e1sokra (Key Reinstallation Attack) sebezhet\u0151nek sz\u00e1m\u00edtott. B\u00e1r a WPA3 egy biztons\u00e1gosabb k\u00e9zfog\u00f3ra t\u00e1maszkodik, amelyet Dragonfly-nak neveznek, \u00e9s amely c\u00e9lja a Wi-Fi h\u00e1l\u00f3zatok v\u00e9delme a sz\u00f3t\u00e1ri offline t\u00e1mad\u00e1sok ellen, Mathy Vanhoef \u00e9s Eyal Ronen biztons\u00e1gi kutat\u00f3k gyenge pontokat tal\u00e1ltak a WPA3-Personal korai megval\u00f3s\u00edt\u00e1s\u00e1ban, amelyek lehet\u0151v\u00e9 tehetik a t\u00e1mad\u00f3k sz\u00e1m\u00e1ra a Wi-Fi jelszavak vissza\u00e1ll\u00edt\u00e1s\u00e1t az id\u0151z\u00edt\u00e9sek vagy a mell\u00e9kcache kihaszn\u00e1l\u00e1s\u00e1val.<\/p>\n

A t\u00e1mad\u00f3k hozz\u00e1f\u00e9rhetnek olyan inform\u00e1ci\u00f3khoz, amelyeket a WPA3 biztons\u00e1gosan titkos\u00edt. Ezt felhaszn\u00e1lhatj\u00e1k olyan szem\u00e9lyes adatok, mint a hitelk\u00e1rtyasz\u00e1mok, jelszavak, cseveg\u0151\u00fczenetek, e-mailek stb. ellop\u00e1s\u00e1ra.<\/p><\/blockquote>\n

Ma k\u00f6zz\u00e9tett\u00e9k a kutat\u00e1si dokumentumot<\/a><\/noindex>, amelynek c\u00edme DragonBlood, ahol a kutat\u00f3k r\u00e9szletesen megvizsg\u00e1lt\u00e1k a WPA3-ban tal\u00e1lhat\u00f3 tervez\u00e9si hi\u00e1nyoss\u00e1gok k\u00e9t t\u00edpus\u00e1t: az els\u0151 az oszt\u00e1lyoz\u00e1s cs\u00f6kkent\u00e9s\u00e9vel t\u00e1mad\u00e1sokhoz vezet, m\u00edg a m\u00e1sodik a mell\u00e9kcache sziv\u00e1rg\u00e1s\u00e1hoz.<\/p>\n

Cache-alap\u00fa mell\u00e9kcsatorna t\u00e1mad\u00e1s<\/h3>\n

\nA Dragonfly jelsz\u00f3k\u00f3dol\u00f3 algoritmus, amelyet \u201evad\u00e1szat \u00e9s csipeget\u00e9s\u201d algoritmusk\u00e9nt is ismernek, felt\u00e9teles \u00e1gakat tartalmaz. Ha a t\u00e1mad\u00f3 k\u00e9pes meghat\u00e1rozni, hogy az if-then-else \u00e1g melyik \u00e1ga lett v\u00e1lasztva, megtudhatja, hogy a jelsz\u00f3elem a konkr\u00e9t iter\u00e1ci\u00f3ban megtal\u00e1lhat\u00f3 volt-e a folyamat sor\u00e1n. Gyakorlatilag kider\u00fclt, hogy ha a t\u00e1mad\u00f3 k\u00e9pes jogosults\u00e1g n\u00e9lk\u00fcli k\u00f3dot futtatni az \u00e1ldozat sz\u00e1m\u00edt\u00f3g\u00e9p\u00e9n, a cache-alap\u00fa t\u00e1mad\u00e1sok felhaszn\u00e1lhat\u00f3k a jelsz\u00f3gener\u00e1l\u00f3 algoritmus els\u0151 iter\u00e1ci\u00f3ja sor\u00e1n megval\u00f3s\u00edtott \u00e1gazat meghat\u00e1roz\u00e1s\u00e1ra. Ezt az inform\u00e1ci\u00f3t felhaszn\u00e1lhatj\u00e1k a jelsz\u00f3megoszt\u00e1sos t\u00e1mad\u00e1s v\u00e9grehajt\u00e1s\u00e1hoz (ez hasonl\u00f3 az offline sz\u00f3t\u00e1ri t\u00e1mad\u00e1shoz).<\/p>\n

Ez a sebezhet\u0151s\u00e9g a CVE-2019-9494 azonos\u00edt\u00f3val k\u00f6vethet\u0151 nyomon.<\/p>\n

A v\u00e9delem a titkos \u00e9rt\u00e9kekt\u0151l f\u00fcgg\u0151 felt\u00e9teles \u00e1gak helyettes\u00edt\u00e9s\u00e9b\u0151l \u00e1ll \u00e1lland\u00f3 id\u0151ben v\u00e9grehajtott v\u00e1laszt\u00e1si seg\u00e9dek alkalmaz\u00e1s\u00e1val. A megval\u00f3s\u00edt\u00e1soknak azt is figyelembe kell venni\u00fck a Legendre-szimb\u00f3lumot<\/a><\/noindex> \u00e1lland\u00f3 id\u0151ben.<\/p>\n

Szinkroniz\u00e1l\u00e1s alap\u00fa mell\u00e9kcsatorna-t\u00e1mad\u00e1s<\/h3>\n

\nAmikor a Dragonfly k\u00e9zfog\u00e1s bizonyos multiplikat\u00edv csoportokat haszn\u00e1l, a jelsz\u00f3 k\u00f3dol\u00f3 algoritmus v\u00e9letlenszer\u0171 sz\u00e1m\u00fa iter\u00e1ci\u00f3t haszn\u00e1l a jelsz\u00f3 k\u00f3dol\u00e1s\u00e1hoz. Az iter\u00e1ci\u00f3k pontos sz\u00e1ma a haszn\u00e1lt jelsz\u00f3t\u00f3l, valamint az hozz\u00e1f\u00e9r\u00e9si pont \u00e9s a kliens MAC-c\u00edm\u00e9t\u0151l f\u00fcgg. A t\u00e1mad\u00f3 t\u00e1voli id\u0151alap\u00fa t\u00e1mad\u00e1st v\u00e9gezhet a jelsz\u00f3 k\u00f3dol\u00f3 algoritmus ellen, hogy meghat\u00e1rozza, h\u00e1ny iter\u00e1ci\u00f3 sz\u00fcks\u00e9ges a jelsz\u00f3 k\u00f3dol\u00e1s\u00e1hoz. A helyre\u00e1ll\u00edtott inform\u00e1ci\u00f3k felhaszn\u00e1lhat\u00f3k jelsz\u00f3 t\u00e1mad\u00e1s v\u00e9grehajt\u00e1s\u00e1ra, amely hasonl\u00f3 az offline sz\u00f3t\u00e1ralap\u00fa t\u00e1mad\u00e1shoz.<\/p>\n

A szinkroniz\u00e1l\u00e1s alap\u00fa t\u00e1mad\u00e1sok megel\u0151z\u00e9se \u00e9rdek\u00e9ben a megval\u00f3s\u00edt\u00e1soknak ki kell kapcsolniuk a sebezhet\u0151 multiplikat\u00edv csoportokat. Technikai szempontb\u00f3l a MODP 22, 23 \u00e9s 24 csoportokat ki kell kapcsolni. Tov\u00e1bb\u00e1 aj\u00e1nlott a MODP 1, 2 \u00e9s 5 csoportok kikapcsol\u00e1sa is.<\/p>\n

Ezt a sebezhet\u0151s\u00e9get a t\u00e1mad\u00e1s megval\u00f3s\u00edt\u00e1s\u00e1nak hasonl\u00f3s\u00e1ga miatt a CVE-2019-9494 azonos\u00edt\u00f3val is nyomon k\u00f6vetik.<\/p>\n

WPA3 visszal\u00e9p\u00e9s<\/h3>\n

\nMivel a 15 \u00e9ves WPA2 protokollat milli\u00e1rdnyi eszk\u00f6z sz\u00e9les k\u00f6rben haszn\u00e1lta, a WPA3 sz\u00e9les k\u00f6r\u0171 elterjed\u00e9se nem fog egyik napr\u00f3l a m\u00e1sikra megt\u00f6rt\u00e9nni. A r\u00e9gi eszk\u00f6z\u00f6k t\u00e1mogat\u00e1sa \u00e9rdek\u00e9ben a tan\u00fas\u00edtott WPA3 eszk\u00f6z\u00f6k \"\u00e1tmeneti \u00fczemm\u00f3dot\" k\u00edn\u00e1lnak, amely be\u00e1ll\u00edthat\u00f3 arra, hogy fogadjon kapcsolatokat mind WPA3-SAE, mind WPA2 haszn\u00e1lat\u00e1val.<\/p>\n

A kutat\u00f3k \u00fagy v\u00e9lik, hogy az \u00e1tmeneti \u00fczemm\u00f3d sebezhet\u0151 a visszal\u00e9p\u0151 t\u00e1mad\u00e1sokkal szemben, amelyeket a t\u00e1mad\u00f3k felhaszn\u00e1lhatnak egy csak WPA2-t t\u00e1mogat\u00f3 hamis hozz\u00e1f\u00e9r\u00e9si pont l\u00e9trehoz\u00e1s\u00e1ra, ami arra k\u00e9nyszer\u00edti a WPA3 t\u00e1mogat\u00e1s\u00fa eszk\u00f6z\u00f6ket, hogy a nem biztons\u00e1gos WPA2 n\u00e9gyir\u00e1ny\u00fa k\u00e9zfog\u00e1son kereszt\u00fcl csatlakozzanak.<\/p>\n

\"A SAE k\u00e9zfog\u00e1s ellen is felfedezt\u00fcnk egy visszal\u00e9p\u0151 t\u00e1mad\u00e1st (\u201eEgyenl\u0151k egyidej\u0171 hiteles\u00edt\u00e9se\u201d, \u00e1ltal\u00e1ban \"Dragonfly\" n\u00e9ven ismert), ahol arra k\u00e9nyszer\u00edthetj\u00fck az eszk\u00f6zt, hogy gyeng\u00e9bb elliptikus g\u00f6rb\u00e9t haszn\u00e1ljon, mint amit \u00e1ltal\u00e1ban\", mondj\u00e1k a kutat\u00f3k.<\/p><\/blockquote>\n

\nTov\u00e1bb\u00e1 a \"k\u00f6z\u00e9ppontban l\u00e9v\u0151 szem\u00e9ly\" jelenl\u00e9te nem sz\u00fcks\u00e9ges a visszal\u00e9p\u0151 t\u00e1mad\u00e1s v\u00e9grehajt\u00e1s\u00e1hoz. Ehelyett a t\u00e1mad\u00f3knak csak a WPA3-SAE h\u00e1l\u00f3zat SSID-j\u00e1t kell ismerni\u00fck.<\/p>\n

A kutat\u00f3k bejelentett\u00e9k eredm\u00e9nyeiket a Wi-Fi Alliance-nak, egy nonprofit szervezetnek, amely tan\u00fas\u00edtja a WiFi szabv\u00e1nyokat \u00e9s a Wi-Fi term\u00e9keket. Felismert\u00e9k a probl\u00e9m\u00e1kat, \u00e9s egy\u00fcttm\u0171k\u00f6dnek a szolg\u00e1ltat\u00f3kkal a m\u00e1r megl\u00e9v\u0151 WPA3 tan\u00fas\u00edtv\u00e1nnyal rendelkez\u0151 eszk\u00f6z\u00f6k jav\u00edt\u00e1sa \u00e9rdek\u00e9ben.<\/p>\n

PoC (kiad\u00e1skori \u00e1llapot szerint \u2014 404)<\/h3>\n

\nA koncepci\u00f3 bizony\u00edt\u00e9kak\u00e9nt a kutat\u00f3k a k\u00f6zelj\u00f6v\u0151ben n\u00e9gy k\u00fcl\u00f6n\u00e1ll\u00f3 eszk\u00f6zt fognak kiadni (a GitHub-repozit\u00f3riumokban al\u00e1bb tal\u00e1lhat\u00f3 hiperhivatkoz\u00e1s seg\u00edts\u00e9g\u00e9vel), amelyek a sebezhet\u0151s\u00e9gek ellen\u0151rz\u00e9s\u00e9re haszn\u00e1lhat\u00f3ak.<\/p>\n

Dragondrain<\/noindex> \u2014 egy eszk\u00f6z, amely ellen\u0151rzi, hogy a hozz\u00e1f\u00e9r\u00e9si pont mennyire sebezhet\u0151 a WPA3 Dragonfly k\u00e9zfog\u00e1sra ir\u00e1nyul\u00f3 DoS t\u00e1mad\u00e1sokkal szemben.
\nDragontime<\/noindex> \u2014 egy k\u00eds\u00e9rleti eszk\u00f6z, amely id\u0151beli t\u00e1mad\u00e1sokat hajt v\u00e9gre a Dragonfly k\u00e9zfog\u00e1s ellen.
\nDragonforce<\/a><\/noindex> \u2014 egy k\u00eds\u00e9rleti eszk\u00f6z, amely inform\u00e1ci\u00f3t gy\u0171jt a id\u0151beli t\u00e1mad\u00e1sok ut\u00e1ni helyre\u00e1ll\u00edt\u00e1shoz, \u00e9s v\u00e9grehajt jelsz\u00f3 t\u00e1mad\u00e1st.
\nDragonslayer<\/a><\/noindex> \u2014 egy eszk\u00f6z, amely EAP-pwd t\u00e1mad\u00e1sokat hajt v\u00e9gre.<\/p>\n

Dragonblood: A Security Analysis of WPA3 SAE K\u00e9zfog\u00e1s\u00e1nak Elemz\u00e9se<\/a><\/noindex>
\nA projekt weboldala \u2014 wpa3.mathyvanhoef.com<\/a><\/noindex>
\n
Forr\u00e1s: habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u041d\u0435\u0441\u043c\u043e\u0442\u0440\u044f \u043d\u0430 \u0442\u043e, \u0447\u0442\u043e \u043d\u043e\u0432\u044b\u0439 \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442 WPA3 \u0435\u0449\u0435 \u0442\u043e\u043b\u043a\u043e\u043c \u043d\u0435 \u0432\u0432\u0435\u0434\u0435\u043d \u0432 \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u044e, \u043d\u0435\u0434\u043e\u0441\u0442\u0430\u0442\u043a\u0438 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 \u0432 \u044d\u0442\u043e\u043c \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0435 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0442 \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a\u0430\u043c \u0432\u0437\u043b\u043e\u043c\u0430\u0442\u044c \u043f\u0430\u0440\u043e\u043b\u044c Wi-Fi. \u041f\u0440\u043e\u0442\u043e\u043a\u043e\u043b Wi-Fi Protected Access III (WPA3) \u0431\u044b\u043b \u0437\u0430\u043f\u0443\u0449\u0435\u043d \u0432 \u043f\u043e\u043f\u044b\u0442\u043a\u0435 \u0443\u0441\u0442\u0440\u0430\u043d\u0438\u0442\u044c \u0442\u0435\u0445\u043d\u0438\u0447\u0435\u0441\u043a\u0438\u0435 \u043d\u0435\u0434\u043e\u0441\u0442\u0430\u0442\u043a\u0438 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 WPA2, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u0434\u043e\u043b\u0433\u043e\u0435 \u0432\u0440\u0435\u043c\u044f \u0441\u0447\u0438\u0442\u0430\u043b\u0441\u044f \u043d\u0435\u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u044b\u043c \u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u044b\u043c \u0434\u043b\u044f KRACK-\u0430\u0442\u0430\u043a\u0438 (Key Reinstallation Attack). \u0425\u043e\u0442\u044f WPA3 \u043e\u043f\u0438\u0440\u0430\u0435\u0442\u0441\u044f \u043d\u0430 \u0431\u043e\u043b\u0435\u0435 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":23239,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-31273","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47WPA3 felt\u00f6r\u00e9se: DragonBlood | ProHoster","description":"Annak ellen\u00e9re, hogy az \u00faj WPA3 szabv\u00e1ny m\u00e9g nem ker\u00fclt teljesen 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