{"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\/cs\/blog\/news\/uyazvimost-v-pam-u2f-pozvolyayushhaya-obojti-autentifikacziyu-na-baze-apparatnogo-tokena","title":{"rendered":"Zranitelnost v pam-u2f, kter\u00e1 umo\u017e\u0148uje obejit\u00ed autentifikace na z\u00e1klad\u011b hardwarov\u00e9ho tokenu.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V\u00fdvoj\u00e1\u0159i projektu openSUSE odhalili zranitelnost (CVE-2025-23013) v PAM modulu pam-u2f, kter\u00fd se pou\u017e\u00edv\u00e1 p\u0159i autentizaci prost\u0159ednictv\u00edm token\u016f YubiKey, Yubico Security Key, YubiHSM a dal\u0161\u00edch FIDO za\u0159\u00edzen\u00ed podporuj\u00edc\u00edch protokol U2F (Universal 2nd Factor). Tato zranitelnost umo\u017e\u0148uje u\u017eivateli s neprivilegovan\u00fdm m\u00edstn\u00edm p\u0159\u00edstupem k syst\u00e9mu, v ur\u010dit\u00fdch konfigurac\u00edch PAM, proj\u00edt autentizac\u00ed bez vlo\u017een\u00ed hardwarov\u00e9ho tokenu. V praxi je modul pam-u2f obvykle p\u0159ipojen pro dvojfaktorovou nebo bezheslovou autentizaci s pou\u017eit\u00edm token\u016f (nap\u0159\u00edklad pro potvrzen\u00ed opr\u00e1vn\u011bn\u00ed k prov\u00e1d\u011bn\u00ed p\u0159\u00edkaz\u016f prost\u0159ednictv\u00edm utilit su a sudo). <\/p>\n

Zranitelnost je zp\u016fsobena nespr\u00e1vn\u00fdm vracen\u00edm hodnoty PAM_IGNORE funkc\u00ed pam_sm_authenticate(). Tato hodnota je vracena v p\u0159\u00edpad\u011b chyby p\u0159i prov\u00e1d\u011bn\u00ed vol\u00e1n\u00ed gethostname(), pam_modutil_drop_priv(), pam_modutil_regain_priv() nebo resolve_authfile_path(), stejn\u011b jako p\u0159i probl\u00e9mech s alokac\u00ed pam\u011bti ve funkc\u00edch strdup() nebo calloc(). Probl\u00e9m spo\u010d\u00edv\u00e1 v tom, \u017ee knihovna libpam, kdy\u017e od PAM modulu obdr\u017e\u00ed v\u00fdsledek s k\u00f3dem PAM_IGNORE, vr\u00e1t\u00ed kone\u010dn\u00fd k\u00f3d PAM_SUCCESS, co\u017e ozna\u010duje \u00fasp\u011b\u0161n\u00e9 dokon\u010den\u00ed autentizace, pokud v \u0159et\u011bzci kontrol n\u011bjak\u00fd jin\u00fd PAM modul vr\u00e1til \u00fasp\u011b\u0161n\u00fd v\u00fdsledek autentizace. <\/p>\n

P\u0159i pou\u017eit\u00ed modulu pam-u2f ve spojen\u00ed s pam_unix pro dvojfaktorovou autentizaci zranitelnost umo\u017e\u0148uje \u00fasp\u011b\u0161n\u00e9 projit\u00ed autentizac\u00ed v p\u0159\u00edpad\u011b \u00fasp\u011b\u0161n\u00e9ho ov\u011b\u0159en\u00ed hesla, bez potvrzen\u00ed druh\u00e9ho faktoru. P\u0159i prov\u00e1d\u011bn\u00ed bezheslov\u00e9 autentizace pomoc\u00ed hardwarov\u00e9ho tokenu m\u016f\u017ee b\u00fdt pam-u2f pou\u017eit v kombinaci s PAM modulem pam_faillock, kter\u00fd omezuje po\u010det pokus\u016f o autentizaci a vrac\u00ed PAM_SUCCESS, pokud limit nebyl vy\u010derp\u00e1n. <\/p>\n

Jako p\u0159\u00edklad \u00fatoku se uv\u00e1d\u00ed obch\u00e1zen\u00ed kontroly tokenu p\u0159i prov\u00e1d\u011bn\u00ed privilegovan\u00fdch p\u0159\u00edkaz\u016f m\u00edstn\u00edm u\u017eivatelem, pomoc\u00ed utilit sudo a su. B\u011bhem spu\u0161t\u011bn\u00ed t\u011bchto p\u0159\u00edkaz\u016f m\u016f\u017ee \u00fato\u010dn\u00edk vytvo\u0159it podm\u00ednky pro vr\u00e1cen\u00ed hodnoty PAM_IGNORE modulem pam-u2f, nap\u0159\u00edklad prost\u0159ednictv\u00edm vy\u010derp\u00e1n\u00ed dostupn\u00e9 pam\u011bti. Probl\u00e9m byl odstran\u011bn ve verzi pam-u2f 1.3.1.
\n
Zdroj: 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\udd47Zranitelnost v pam-u2f, kter\u00e1 umo\u017e\u0148uje obej\u00edt autentizaci zalo\u017eenou na hardwarov\u00e9m tokenu | ProHoster","description":"V\u00fdvoj\u00e1\u0159i projektu openSUSE odhalili zranitelnost (CVE-2025-23013) v PAM modulu pam-u2f, kter\u00fd se pou\u017e\u00edv\u00e1 p\u0159i autentizaci prost\u0159ednictv\u00edm token\u016f YubiKey, Yubico Security Key, YubiHSM a dal\u0161\u00edch FIDO za\u0159\u00edzen\u00ed podporuj\u00edc\u00edch.","canonical_url":"https:\/\/prohoster.info\/cs\/blog\/news\/uyazvimost-v-pam-u2f-pozvolyayushhaya-obojti-autentifikacziyu-na-baze-apparatnogo-tokena","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"cs_CZ","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 pam-u2f, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043e\u0431\u043e\u0439\u0442\u0438 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