{"id":121386,"date":"2025-01-17T15:46:06","date_gmt":"2025-01-17T13:46:06","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-pam-u2f-pozvolyayushhaya-obojti-autentifikacziyu-na-baze-apparatnogo-tokena"},"modified":"2025-01-17T15:46:06","modified_gmt":"2025-01-17T13:46:06","slug":"uyazvimost-v-pam-u2f-pozvolyayushhaya-obojti-autentifikacziyu-na-baze-apparatnogo-tokena","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/uyazvimost-v-pam-u2f-pozvolyayushhaya-obojti-autentifikacziyu-na-baze-apparatnogo-tokena","title":{"rendered":"Se vulnerability in pam-u2f that allows bypassing hardware token-based authentication","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Az openSUSE projekt fejleszt\u0151i egy s\u00e9r\u00fcl\u00e9kenys\u00e9get (CVE-2025-23013) fedeztek fel a pam-u2f PAM modulban, amelyet YubiKey, Yubico Security Key, YubiHSM \u00e9s m\u00e1s U2F (Universal 2nd Factor) protokollt t\u00e1mogat\u00f3 FIDO-eszk\u00f6z\u00f6kkel t\u00f6rt\u00e9n\u0151 hiteles\u00edt\u00e9skor haszn\u00e1lnak. A s\u00e9r\u00fcl\u00e9kenys\u00e9g lehet\u0151v\u00e9 teszi, hogy egy nem privilegiz\u00e1lt helyi hozz\u00e1f\u00e9r\u00e9ssel rendelkez\u0151 felhaszn\u00e1l\u00f3 bizonyos PAM konfigur\u00e1ci\u00f3k mellett \u00fagy v\u00e9gezzen hiteles\u00edt\u00e9st, hogy nem helyez be hardvertokent. A gyakorlatban a pam-u2f modul \u00e1ltal\u00e1ban a k\u00e9tfaktoros vagy jelsz\u00f3 n\u00e9lk\u00fcli hiteles\u00edt\u00e9shez kapcsol\u00f3dik tok\u00e9nek haszn\u00e1lat\u00e1val (p\u00e9ld\u00e1ul parancsok v\u00e9grehajt\u00e1si jogosults\u00e1gainak meger\u0151s\u00edt\u00e9s\u00e9re az su \u00e9s sudo seg\u00e9dprogramok \u00e1ltal). <\/p>\n

A s\u00e9r\u00fcl\u00e9kenys\u00e9g oka, hogy a pam_sm_authenticate() f\u00fcggv\u00e9ny helytelen\u00fcl adja vissza a PAM_IGNORE \u00e9rt\u00e9ket. Ezt az \u00e9rt\u00e9ket akkor adja vissza, ha a gethostname(), pam_modutil_drop_priv(), pam_modutil_regain_priv() vagy resolve_authfile_path() h\u00edv\u00e1sok v\u00e9grehajt\u00e1sa hib\u00e1s, valamint ha mem\u00f3riaallok\u00e1ci\u00f3s probl\u00e9m\u00e1k l\u00e9pnek fel a strdup() vagy calloc() sor\u00e1n. A probl\u00e9m\u00e1t az okozza, hogy a libpam k\u00f6nyvt\u00e1r, ha egy PAM modul PAM_IGNORE k\u00f3d\u00fa eredm\u00e9nyt ad vissza, a v\u00e9gs\u0151 PAM_SUCCESS k\u00f3dot visszaadja, amely a sikeres hiteles\u00edt\u00e9st jelzi, ha a ellen\u0151rz\u00e9si l\u00e1ncban egy m\u00e1sik PAM modul sikeresen v\u00e9gezte el a hiteles\u00edt\u00e9st. <\/p>\n

A pam-u2f modul pam_unix-szal val\u00f3 egy\u00fctt haszn\u00e1lata eset\u00e9n a s\u00e9r\u00fcl\u00e9kenys\u00e9g lehet\u0151v\u00e9 teszi a hiteles\u00edt\u00e9s sikeres v\u00e9grehajt\u00e1s\u00e1t, ha a jelsz\u00f3 ellen\u0151rz\u00e9se sikeres, an\u00e9lk\u00fcl, hogy a m\u00e1sodik faktort meger\u0151s\u00edten\u00e9. Jelsz\u00f3 n\u00e9lk\u00fcli hardvertokenes hiteles\u00edt\u00e9s v\u00e9grehajt\u00e1sakor a pam-u2f p\u00e1ros\u00edthat\u00f3 a pam_faillock PAM modullal, amely korl\u00e1tozza a hiteles\u00edt\u00e9si k\u00eds\u00e9rletek sz\u00e1m\u00e1t, \u00e9s PAM_SUCCESS-t ad vissza, ha a korl\u00e1t nem mer\u00fclt ki. <\/p>\n

A t\u00e1mad\u00e1s egyik p\u00e9ld\u00e1ja a token ellen\u0151rz\u00e9se megker\u00fcl\u00e9se, amikor egy helyi felhaszn\u00e1l\u00f3 privilegiz\u00e1lt parancsokat hajt v\u00e9gre, a sudo \u00e9s su seg\u00e9dprogramok felhaszn\u00e1l\u00e1s\u00e1val. E parancsok v\u00e9grehajt\u00e1sa k\u00f6zben a t\u00e1mad\u00f3 l\u00e9trehozhat olyan k\u00f6r\u00fclm\u00e9nyeket, amelyek lehet\u0151v\u00e9 teszik a pam-u2f modulnak a PAM_IGNORE \u00e9rt\u00e9k visszaad\u00e1s\u00e1t, p\u00e9ld\u00e1ul a rendelkez\u00e9sre \u00e1ll\u00f3 mem\u00f3ria kimer\u00edt\u00e9s\u00e9vel. A probl\u00e9ma a pam-u2f 1.3.1 verzi\u00f3j\u00e1ban megold\u00f3dott.
\n
Forr\u00e1s: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 openSUSE \u0432\u044b\u044f\u0432\u0438\u043b\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2025-23013) \u0432 PAM-\u043c\u043e\u0434\u0443\u043b\u0435 pam-u2f, \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u043e\u043c \u043f\u0440\u0438 \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438 \u0447\u0435\u0440\u0435\u0437 \u0442\u043e\u043a\u0435\u043d\u044b YubiKey, Yubico Security Key, YubiHSM \u0438 \u0434\u0440\u0443\u0433\u0438\u0435 FIDO-\u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430, \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u0438\u0432\u0430\u044e\u0449\u0438\u0435 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b U2F (Universal 2nd Factor). \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e, \u0438\u043c\u0435\u044e\u0449\u0435\u043c\u0443 \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0439 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u044b\u0439 \u0434\u043e\u0441\u0442\u0443\u043f \u043a \u0441\u0438\u0441\u0442\u0435\u043c\u0435, \u0432 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u044b\u0445 \u043a\u043e\u043d\u0444\u0438\u0433\u0443\u0440\u0430\u0446\u0438\u044f\u0445 PAM \u043f\u0440\u043e\u0439\u0442\u0438 \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u044e \u0431\u0435\u0437 \u0432\u0441\u0442\u0430\u0432\u043a\u0438 \u0430\u043f\u043f\u0430\u0440\u0430\u0442\u043d\u043e\u0433\u043e \u0442\u043e\u043a\u0435\u043d\u0430. \u041d\u0430 \u043f\u0440\u0430\u043a\u0442\u0438\u043a\u0435 \u043c\u043e\u0434\u0443\u043b\u044c pam-u2f \u043a\u0430\u043a \u043f\u0440\u0430\u0432\u0438\u043b\u043e \u043f\u043e\u0434\u043a\u043b\u044e\u0447\u0430\u0435\u0442\u0441\u044f \u0434\u043b\u044f […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-121386","post","type-post","status-publish","format-standard","hentry","category-news"],"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\udd47 S\u00e9r\u00fcl\u00e9kenys\u00e9g a pam-u2f-ben, amely lehet\u0151v\u00e9 teszi a hardvertoken alap\u00fa hiteles\u00edt\u00e9s megker\u00fcl\u00e9s\u00e9t | ProHoster","description":"Az openSUSE projekt fejleszt\u0151i egy s\u00e9r\u00fcl\u00e9kenys\u00e9get (CVE-2025-23013) fedeztek fel a 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