{"id":117239,"date":"2024-07-10T15:43:03","date_gmt":"2024-07-10T13:43:04","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-protokole-radius-pozvolyayushhaya-poddelat-otvet-pri-autentifikaczii"},"modified":"2024-07-10T15:43:03","modified_gmt":"2024-07-10T13:43:04","slug":"uyazvimost-v-protokole-radius-pozvolyayushhaya-poddelat-otvet-pri-autentifikaczii","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/uyazvimost-v-protokole-radius-pozvolyayushhaya-poddelat-otvet-pri-autentifikaczii","title":{"rendered":"A RADIUS protokollban tal\u00e1lhat\u00f3 sebezhet\u0151s\u00e9g, amely lehet\u0151v\u00e9 teszi a v\u00e1lasz hamis\u00edt\u00e1s\u00e1t az azonos\u00edt\u00e1s sor\u00e1n.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Amerikai egyetemek \u00e9s a Cloudflare \u00e9s Microsoft c\u00e9gek kutat\u00f3csoportja \u00faj t\u00e1mad\u00e1si technik\u00e1t fejlesztett ki a RADIUS protokoll ellen, amelyet a szolg\u00e1ltat\u00f3k, felh\u0151szolg\u00e1ltat\u00f3k \u00e9s VPN-szolg\u00e1ltat\u00f3k haszn\u00e1lnak a felhaszn\u00e1l\u00f3k azonos\u00edt\u00e1s\u00e1ra, jogosults\u00e1gi ellen\u0151rz\u00e9s\u00e9re \u00e9s nyilv\u00e1ntart\u00e1s\u00e1ra. A Blast-RADIUS fed\u0151nev\u0171 t\u00e1mad\u00e1s lehet\u0151v\u00e9 teszi a RADIUS szerver v\u00e1lasz\u00e1nak hamis\u00edt\u00e1s\u00e1t az azonos\u00edt\u00e1s sor\u00e1n, \u00edgy a felhaszn\u00e1l\u00f3 kapcsol\u00f3dhat az hozz\u00e1f\u00e9r\u00e9si jelsz\u00f3 n\u00e9lk\u00fcl.     <\/p>\n<p>A sebezhet\u0151s\u00e9g kihaszn\u00e1l\u00e1s\u00e1hoz (CVE-2024-3596) a t\u00e1mad\u00f3nak k\u00e9pesnek kell lennie a tranzitforgalom lehallgat\u00e1s\u00e1ra \u00e9s egy teljes \u00e9rt\u00e9k\u0171 MITM-t\u00e1mad\u00e1s lebonyol\u00edt\u00e1s\u00e1ra, amely lehet\u0151v\u00e9 teszi a bel\u00e9p\u0151 \u00e9s t\u00e1voz\u00f3 tranzit UDP-csomagok olvas\u00e1s\u00e1t, lehallgat\u00e1s\u00e1t, blokkol\u00e1s\u00e1t \u00e9s m\u00f3dos\u00edt\u00e1s\u00e1t, melyek az \u00fcgyfelek azonos\u00edt\u00e1si k\u00e9r\u00e9s\u00e9re (Access-Request) ir\u00e1nyulnak \u00e9s a RADIUS szerver \u00e1ltal a m\u0171velet meger\u0151s\u00edt\u00e9s\u00e9vel vagy elutas\u00edt\u00e1s\u00e1val \u00e9rkeznek. Ha a t\u00e1mad\u00f3 megszerzi az azonos\u00edt\u00e1si k\u00e9r\u00e9st, hamis v\u00e1laszt k\u00fcldhet, megadva egy m\u00e1sik eredm\u00e9nyt\u00edpust (p\u00e9ld\u00e1ul Access-Accept ahelyett, hogy Access-Reject), illetve potenci\u00e1lisan \u00e1tveheti az Access-Challenge v\u00e1laszt, amelyet a k\u00e9tfaktoros azonos\u00edt\u00e1shoz haszn\u00e1lnak, \u00e9s kicser\u00e9lheti azt Access-Accept v\u00e1laszra, \u00edgy megker\u00fclve a tov\u00e1bbi ellen\u0151rz\u00e9si l\u00e9p\u00e9st.    <center><img decoding=\"async\" alt=\"A RADIUS protokollban tal\u00e1lhat\u00f3 sebezhet\u0151s\u00e9g, amely lehet\u0151v\u00e9 teszi a v\u00e1lasz hamis\u00edt\u00e1s\u00e1t az azonos\u00edt\u00e1s sor\u00e1n.\" src=\"\/wp-content\/uploads\/2024\/07\/387db9c9f51c3eebe36f97bf178eb451.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>      <\/p>\n<p>A t\u00e1mad\u00e1s azon alapul, hogy a RADIUS protokoll UDP-t haszn\u00e1l sz\u00e1ll\u00edt\u00f3k\u00e9nt, \u00e9s az \u00e1tvitt \u00fczenetek integrit\u00e1s\u00e1t az MD5 algoritmus seg\u00edts\u00e9g\u00e9vel ellen\u0151rzi. Az \u00fczenetek, amelyek a <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/hu\/server\/dts-prohoster\/\"   title=\"szerverrel\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3085\">szerverrel<\/a> hozz\u00e1f\u00e9r\u00e9s \u00e9s a RADIUS-szerver k\u00f6z\u00f6tt ker\u00fclnek \u00e1tkonvert\u00e1l\u00e1sra, egy titkos kulcsot haszn\u00e1lnak, amely a hozz\u00e1f\u00e9r\u00e9si ponthoz \u00e9s a RADIUS-szerverhez ismert, de a t\u00e1mad\u00f3 sz\u00e1m\u00e1ra nem. Az azonos\u00edt\u00e1si k\u00e9r\u00e9sre adott v\u00e1lasz\u00e1ban a RADIUS-szerver MD5 hash-t gener\u00e1l, amivel a hozz\u00e1f\u00e9r\u00e9si szerver meger\u0151s\u00edtheti, hogy az \u00fczenetet egy hiteles\u00edtett szerver k\u00fcldte. Az MD5 hash mag\u00e1ban foglalja a k\u00e9r\u00e9sben k\u00fcld\u00f6tt v\u00e9letlenszer\u0171 \u00e9rt\u00e9ket, a k\u00e9r\u00e9s azonos\u00edt\u00f3j\u00e1t, a visszak\u00fcld\u00f6tt attrib\u00fatumokat \u00e9s a titkos kulcsot.    <\/p>\n<p>A t\u00e1mad\u00f3 az MITM-t\u00e1mad\u00e1s sor\u00e1n k\u00e9pes megfogni a k\u00e9r\u00e9sben tov\u00e1bb\u00edtott azonos\u00edt\u00f3t \u00e9s v\u00e9letlenszer\u0171 \u00e9rt\u00e9ket, valamint meg tudja j\u00f3solni a m\u0171velet k\u00f3dj\u00e1t, m\u00e9ret\u00e9t \u00e9s attrib\u00fatumait. A feladat az, hogy egy megfelel\u0151 ellen\u0151rz\u0151 hasht k\u00e9pezz\u00fcnk, amely illeszkedik a m\u00f3dos\u00edtott m\u0171velet eredm\u00e9ny\u00e9hez, \u00e9s amely \u00e1thalad a titkos kulccsal v\u00e9gzett hash-ellen\u0151rz\u00e9sen. Az MD5 algoritmus nem ellen\u00e1ll\u00f3 a \u00fctk\u00f6z\u00e9s keres\u00e9ssel szemben, \u00edgy a t\u00e1mad\u00f3 manipul\u00e1lva a l\u00e9nyegtelen extra kit\u00f6lt\u00e9st, k\u00e9pes olyan adatkombin\u00e1ci\u00f3kat tal\u00e1lni, amelyek a k\u00edv\u00e1nt param\u00e9terekkel rendelkez\u0151 MD5-hashe az eredeti v\u00e1lasz MD5-hashej\u00e9vel fog egyezni, \u00e9s bek\u00fcldeni egy hamis v\u00e1laszt a sikeres hiteles\u00edt\u00e9si k\u00f3d\u00fa v\u00e1lasz (Access-Accept) helyett, ami az error \u00fczenetet tartalmazza.     <center><img decoding=\"async\" alt=\"A RADIUS protokollban tal\u00e1lhat\u00f3 sebezhet\u0151s\u00e9g, amely lehet\u0151v\u00e9 teszi a v\u00e1lasz hamis\u00edt\u00e1s\u00e1t az azonos\u00edt\u00e1s sor\u00e1n.\" src=\"\/wp-content\/uploads\/2024\/07\/271cb7d8b85b87ba3517ba6baac6e790.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>      <\/p>\n<p>Mivel a hozz\u00e1f\u00e9r\u00e9si k\u00e9relmek (Access-Request) csomagjainak feldolgoz\u00e1sakor nem alkalmaznak hiteles\u00edt\u00e9st \u00e9s integrit\u00e1s-ellen\u0151rz\u00e9st, a t\u00e1mad\u00e1s sor\u00e1n a t\u00e1mad\u00f3 k\u00e9pes az eredeti k\u00e9r\u00e9sbe egy extra attrib\u00fatumot, a \u201eProxy-State\u201d-t besz\u00farni, amely a RADIUS szerver v\u00e1lasz\u00e1ban fog megjelenni. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/hu\/server\/dts-los-angeles\/\"   title=\"a szerver\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3927\">a szerver<\/a> A t\u00e1mad\u00f3 olyan tov\u00e1bbi attrib\u00fatumot adhat hozz\u00e1, mint a &#171;Proxy-State&#187;, amelyet a RADIUS-szerver a v\u00e1lasz\u00e1ban t\u00fckr\u00f6z. A &#171;Proxy-State&#187; tartalm\u00e1t \u00fctk\u00f6z\u00e9s figyelembev\u00e9tel\u00e9vel v\u00e1lasztj\u00e1k ki, \u00edgy a val\u00f3di \u00e9s a hamis v\u00e1laszokban a hash \u00e9rt\u00e9ke az MD5-\u00f6n azonos. A k\u00eds\u00e9rlet sor\u00e1n az MD5-\u00f6s \u00fctk\u00f6z\u00e9skeres\u00e9s, amely a t\u00e1mad\u00e1s v\u00e9grehajt\u00e1s\u00e1hoz sz\u00fcks\u00e9ges, 3-6 percet vett ig\u00e9nybe, ami hosszabb, mint a tipikus id\u0151t\u00fall\u00e9p\u00e9s, amely 30-60 m\u00e1sodpercre tehet\u0151, de az \u00fctk\u00f6z\u00e9s keres\u00e9si id\u0151 cs\u00f6kkenthet\u0151 er\u0151sebb felszerel\u00e9s, GPU felhaszn\u00e1l\u00e1sa \u00e9s m\u0171veletek p\u00e1rhuzamos\u00edt\u00e1sa r\u00e9v\u00e9n.                       <\/p>\n<p>A sebezhet\u0151s\u00e9gek elleni alapvet\u0151 v\u00e9delmi int\u00e9zked\u00e9sk\u00e9nt a EAP (Extensible Authentication Protocol, RFC 3579) protokoll alkalmaz\u00e1s\u00e1t javasoljuk, amelyn\u00e9l az \u00fczenetek tov\u00e1bbi ellen\u0151rz\u00e9s\u00e9re a Message-Authenticator attrib\u00fatumot haszn\u00e1lj\u00e1k. A t\u00e1mad\u00e1sok elleni v\u00e9dekez\u00e9shez a protokoll kiterjeszt\u00e9seit (RadSec) is felhaszn\u00e1lhatjuk, amelyek tartalmazz\u00e1k a RADIUS \u00fczenetek TLS vagy DTLS alap\u00fa titkos\u00edtott csatorn\u00e1kon kereszt\u00fcli \u00e1tvitel\u00e9t. Ezenk\u00edv\u00fcl minimaliz\u00e1lni lehet a v\u00e1laszid\u0151k \u00e9rt\u00e9k\u00e9t, \u00e9s blokkolni lehet a Proxy-State attrib\u00fatummal rendelkez\u0151 v\u00e1laszokat. A RADIUS \u00fczenetek TCP-n kereszt\u00fcli tov\u00e1bb\u00edt\u00e1sa megnehez\u00edti a t\u00e1mad\u00e1st, de nem z\u00e1rja ki annak v\u00e9grehajt\u00e1s\u00e1t.     <\/p>\n<p>A t\u00e1mad\u00e1s v\u00e9grehajt\u00e1s\u00e1hoz sz\u00fcks\u00e9ges k\u00f3d m\u00e9g nem ker\u00fclt nyilv\u00e1noss\u00e1gra, de a hashclash projekthez \u00e1tadt\u00e1k a m\u00f3dos\u00edt\u00e1sokat, amelyek jav\u00edtj\u00e1k az MD5 \u00fctk\u00f6z\u00e9sek kiv\u00e1laszt\u00e1s\u00e1t a t\u00e1mad\u00e1s saj\u00e1toss\u00e1gainak figyelembev\u00e9tel\u00e9vel. A FreeRADIUS RADIUS-szerverben a probl\u00e9ma a 3.0.27 \u00e9s 3.2.5 kiad\u00e1sokban megold\u00f3dott az \u00fczenet-ellen\u0151rz\u0151 (Message-Authenticator) attrib\u00fatum k\u00f6telez\u0151 alkalmaz\u00e1s\u00e1nak aktiv\u00e1l\u00e1s\u00e1val, valamint a Proxy-State attrib\u00fatummal rendelkez\u0151 csomagok feldolgoz\u00e1s\u00e1nak korl\u00e1toz\u00e1s\u00e1ra szolg\u00e1l\u00f3 be\u00e1ll\u00edt\u00e1s hozz\u00e1ad\u00e1s\u00e1val.<br \/>\n<br \/>Forr\u00e1s: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=61517\">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 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u0438\u0445 \u0430\u043c\u0435\u0440\u0438\u043a\u0430\u043d\u0441\u043a\u0438\u0445 \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u043e\u0432 \u0438 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0439 Cloudflare \u0438 Microsoft \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0430\u043b\u0430 \u043d\u043e\u0432\u0443\u044e \u0442\u0435\u0445\u043d\u0438\u043a\u0443 \u0430\u0442\u0430\u043a\u0438 \u043d\u0430 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b RADIUS, \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u044b\u0439 \u043e\u043f\u0435\u0440\u0430\u0442\u043e\u0440\u0430\u043c\u0438 \u0441\u0432\u044f\u0437\u0438, \u043e\u0431\u043b\u0430\u0447\u043d\u044b\u043c\u0438 \u0441\u0435\u0440\u0432\u0438\u0441\u0430\u043c\u0438 \u0438 VPN-\u043f\u0440\u043e\u0432\u0430\u0439\u0434\u0435\u0440\u0430\u043c\u0438 \u0434\u043b\u044f \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438, \u0430\u0432\u0442\u043e\u0440\u0438\u0437\u0430\u0446\u0438\u0438 \u0438 \u0430\u043a\u043a\u0430\u0443\u043d\u0442\u0438\u043d\u0433\u0430 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439. \u0410\u0442\u0430\u043a\u0430, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043f\u043e\u043b\u0443\u0447\u0438\u043b\u0430 \u043a\u043e\u0434\u043e\u0432\u043e\u0435 \u0438\u043c\u044f Blast-RADIUS, \u0434\u0430\u0451\u0442 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u043f\u043e\u0434\u0434\u0435\u043b\u0430\u0442\u044c \u043e\u0442\u0432\u0435\u0442 RADIUS-\u0441\u0435\u0440\u0432\u0435\u0440\u0430 \u043f\u0440\u0438 \u043f\u0440\u043e\u0445\u043e\u0436\u0434\u0435\u043d\u0438\u0438 \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438 \u0438 \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u043e\u0432\u0430\u0442\u044c \u043f\u043e\u0434\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435 \u0430\u0431\u043e\u043d\u0435\u043d\u0442\u0430 \u0431\u0435\u0437 \u0437\u043d\u0430\u043d\u0438\u044f \u043f\u0430\u0440\u043e\u043b\u044f \u0434\u043e\u0441\u0442\u0443\u043f\u0430. \u0414\u043b\u044f \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":117240,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-117239","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0413\u0440\u0443\u043f\u043f\u0430 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u0438\u0437 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u0438\u0445 \u0430\u043c\u0435\u0440\u0438\u043a\u0430\u043d\u0441\u043a\u0438\u0445 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