{"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\/et\/blog\/novosti-interneta\/uyazvimost-v-protokole-radius-pozvolyayushhaya-poddelat-otvet-pri-autentifikaczii","title":{"rendered":"RADIUS protokolli haavatavus, mis v\u00f5imaldab valevastuste valeautentimise korral.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Mitme Ameerika \u00fclikooli ja ettev\u00f5tte, sealhulgas Cloudflare ja Microsoft, teadlaste r\u00fchm on v\u00e4lja t\u00f6\u00f6tanud uue RADIUS-protokolli r\u00fcnnaku tehnika, mille suhtes on vastuv\u00f5tlikud telekommunikatsiooniettev\u00f5tted, pilveteenused ja VPN-teenuse pakkujad kasutajate autentimiseks, autoriseerimiseks ja arveldamiseks. R\u00fcnnak, mille koodnimi on Blast-RADIUS, v\u00f5imaldab vale RADIUS-serveri vastuse simuleerimist autentimise k\u00e4igus ja kasutaja \u00fchenduse loomist ilma juurdep\u00e4\u00e4suparooli teadmiseta.     <\/p>\n<p>V\u00f5rguhaavatavuse (CVE-2024-3596) kasutamiseks peab r\u00fcndaja olema v\u00f5imeline p\u00fc\u00fcdma vahepealset liiklust ja teostama t\u00e4ie\u00f5iguslikku MITM-r\u00fcnnakut, mis v\u00f5imaldab lugeda, j\u00e4lgida, blokeerida ja muuta sissetulevaid ja v\u00e4ljaminevaid UDP-pakette, mis saadetakse juurdep\u00e4\u00e4supunktidelt kliendi autentimise taotluste (Access-Request) jaoks ja saadetakse RADIUS-serverilt operatsiooni kinnitamiseks v\u00f5i tagasil\u00fckkamiseks. Kui r\u00fcndaja on autentimise taotluse kinni p\u00fc\u00fcdnud, v\u00f5ib ta saata vale vastuse, m\u00e4rkides sellele vastusele teise tulemuse t\u00fc\u00fcbi (nt Access-Accept Access-Reject'i asemel). R\u00fcndaja v\u00f5ib samuti potentsiaalselt kinni p\u00fc\u00fcda Access-Challenge vastuse, mida kasutatakse kahefaktorilise autentimise puhul, ja asendada selle Access-Accept vastusega, et m\u00f6\u00f6duda lisakontrolli l\u00e4bimisest.    <center><img decoding=\"async\" alt=\"RADIUS protokolli haavatavus, mis v\u00f5imaldab valevastuste valeautentimise korral.\" src=\"\/wp-content\/uploads\/2024\/07\/387db9c9f51c3eebe36f97bf178eb451.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>      <\/p>\n<p>R\u00fcnnak p\u00f5hineb sellel, et RADIUS-protokoll kasutab transpordina UDP-d ja kontrollib edastatud s\u00f5numite terviklikkust MD5-algoritmiga. S\u00f5numite kontrollimiseks, mis edastatakse vahepeal <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/et\/server\/dts-prohoster\/\"   title=\"serveriga\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3085\">serveriga<\/a> juurdep\u00e4\u00e4su ja RADIUS-serveriga, kasutatakse saladuskoodi, mis on tuntud juurdep\u00e4\u00e4supunkti ja RADIUS-serveri jaoks, kuid mitte r\u00fcndaja jaoks. Vastuseks RADIUS-serveri kinnitustaotlusele genereerib RADIUS-server MD5-hashi, mille abil juurdep\u00e4\u00e4suserver saab veenduda, et s\u00f5num on saadetud volitatud serveri poolt. MD5-hash h\u00f5lmab taotluses saadetud juhuslikku v\u00e4\u00e4rtust, taotluse identifikaatorit, tagastatavaid atribuute ja saladuskoodi.    <\/p>\n<p>MITM-r\u00fcnnaku k\u00e4igus suudab r\u00fcndaja haarata edastatud p\u00e4ringus oleva identifikaatori ja juhusliku v\u00e4\u00e4rtuse ning ennustada toimingukoodi, suuruse ja atribuudid. \u00dclesanne on luua korrektne kontrollsumm, mis vastaks muudetud toimingu tulemile ja l\u00e4biks kontrolli, kasutades salajast v\u00f5ti. MD5 algoritm ei ole vastupidav kollisioonide \u00fcritamisele, mis v\u00f5imaldab r\u00fcndajal manipuleerida t\u00e4hendusteta t\u00e4iteelementidega, et leida andmete kombinatsioon, mille MD5-hash vastaks algse vastuse MD5-hashile, ja saata vale vastus, millel on \u00f5nnestunud autentimise kood (Access-Accept) vea teabe s\u00f5numi asemel.     <center><img decoding=\"async\" alt=\"RADIUS protokolli haavatavus, mis v\u00f5imaldab valevastuste valeautentimise korral.\" src=\"\/wp-content\/uploads\/2024\/07\/271cb7d8b85b87ba3517ba6baac6e790.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>      <\/p>\n<p>Kuna p\u00e4\u00e4sutaotluse (Access-Request) paketiga t\u00f6\u00f6tlemisel ei rakendata autentimist ja terviklikkuse kontrolli, suudab r\u00fcndaja algsesse p\u00e4ringusse libistada <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/et\/server\/dts-los-angeles\/\"   title=\"serverile\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3927\">serverile<\/a> r\u00fcndaja v\u00f5ib lisada t\u00e4iendava atribuut \u201eProxy-State\u201d, mis peegeldub RADIUS-serveris vastuses. \u201eProxy-State\u201d sisu valitakse nii, et reaalsete ja vale vastuste MD5-hash'i kontrollv\u00e4\u00e4rtus on identne. Katse k\u00e4igus v\u00f5ttis MD5 kokkulangevuse leidmine r\u00fcnnaku teostamiseks aega 3-6 minutit, mis on pikem kui t\u00fc\u00fcpiline timeout 30-60 sekundit, kuid kokkulangevuse leidmise aega saab l\u00fchendada, kasutades v\u00f5imsamat varustust, GPU-de kaasamist ja operatsioonide paralleelset t\u00f6\u00f6tlemist.                       <\/p>\n<p>Peamise meetmena haavatavuse kaitsmiseks soovitatakse kasutada EAP (Extensible Authentication Protocol, RFC 3579) protokolli, mille puhul kasutatakse s\u00f5numite t\u00e4iendavaks kontrollimiseks \u0430\u0442\u0440\u0438\u0431\u0443\u0442 Message-Authenticator. R\u00fcnnaku vastu kaitsmiseks v\u00f5ib kasutada ka protokolli laiendusi (RadSec), mis h\u00f5lmavad RADIUS-s\u00f5numite edastamist kr\u00fcpteeritud kanalite kaudu TLS v\u00f5i DTLS p\u00f5hjal. Lisaks on soovitatav v\u00e4hendada vastuse saamise ajavahemikke miinimumini ja blokeerida \u043e\u0442\u0432\u0435\u0442idega \u0430\u0442\u0440\u0438\u0431\u0443\u0442 Proxy-State. RADIUS-s\u00f5numite edastamine TCP peal muudab r\u00fcnnaku keerulisemaks, kuid ei v\u00e4lista selle teostamist.     <\/p>\n<p>R\u00fcnnakukoodi ei ole veel avalikult v\u00e4lja antud, kuid hashclash projektile on edastatud muudatused, mis parandavad MD5 kokkulangevuste leidmist r\u00fcnnaku spetsiifikat arvestades. FreeRADIUS RADIUS-serveris on probleem lahendatud versioonides 3.0.27 ja 3.2.5, kohustuslikku Message-Authenticator atribuut rakendades ning lisades seadistuse, mis piirab Proxy-State atribuudiga paketide t\u00f6\u00f6tlemist.<br \/>\n<br \/>Allikas: <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-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - 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 \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 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