{"id":107077,"date":"2023-03-03T12:48:24","date_gmt":"2023-03-03T10:48:24","guid":{"rendered":"https:\/\/prohoster.info\/?p=107077"},"modified":"2023-03-05T11:49:19","modified_gmt":"2023-03-05T09:49:19","slug":"uyazvimost-v-strongswan-ipsec-dopuskayushhaya-udalyonnoe-vypolnenie-koda","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/uyazvimost-v-strongswan-ipsec-dopuskayushhaya-udalyonnoe-vypolnenie-koda","title":{"rendered":"Zranitelnost v strongSwan IPsec, umo\u017e\u0148uj\u00edc\u00ed vzd\u00e1len\u00e9 spu\u0161t\u011bn\u00ed k\u00f3du","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Byla vyd\u00e1na verze strongSwan 5.9.10, svobodn\u00e9ho bal\u00ed\u010dku pro vytv\u00e1\u0159en\u00ed VPN p\u0159ipojen\u00ed zalo\u017een\u00fdch na protokolu IPSec, pou\u017e\u00edvan\u00e9ho na Linuxu, Androidu, FreeBSD a macOS. V nov\u00e9 verzi byla odstran\u011bna kritick\u00e1 zranitelnost (CVE-2023-26463), kter\u00e1 mohla b\u00fdt vyu\u017eita k obch\u00e1zen\u00ed autentizace, a potenci\u00e1ln\u011b tak\u00e9 mohla v\u00e9st k proveden\u00ed k\u00f3du \u00fato\u010dn\u00edka na stran\u011b serveru nebo klienta. Probl\u00e9m se projevuje p\u0159i ov\u011b\u0159ov\u00e1n\u00ed speci\u00e1ln\u011b p\u0159ipraven\u00fdch certifik\u00e1t\u016f v metod\u00e1ch autentizace EAP (Extensible Authentication Protocol) zalo\u017een\u00fdch na TLS. <\/p>\n

Zranitelnost je zp\u016fsobena t\u00edm, \u017ee TLS zpracovatel nespr\u00e1vn\u011b p\u0159ij\u00edm\u00e1 ve\u0159ejn\u00e9 kl\u00ed\u010de z certifik\u00e1tu sousedn\u00edho uzlu (peer), pova\u017euje je za d\u016fv\u011bryhodn\u00e9, i kdy\u017e certifik\u00e1t nelze \u00fasp\u011b\u0161n\u011b verifikovat. Konkr\u00e9tn\u011b p\u0159i vol\u00e1n\u00ed funkce tls_find_public_key() se pro ur\u010den\u00ed d\u016fv\u011bryhodn\u00fdch certifik\u00e1t\u016f pou\u017e\u00edv\u00e1 v\u00fdb\u011br na z\u00e1klad\u011b typu ve\u0159ejn\u00e9ho kl\u00ed\u010de. Probl\u00e9m spo\u010d\u00edv\u00e1 v tom, \u017ee prom\u011bnn\u00e1 pou\u017e\u00edvan\u00e1 k ur\u010den\u00ed typu kl\u00ed\u010de pro vyhled\u00e1vac\u00ed operaci je nastavena v ka\u017ed\u00e9m p\u0159\u00edpad\u011b, i kdy\u017e certifik\u00e1t nen\u00ed d\u016fv\u011bryhodn\u00fd. <\/p>\n

Nav\u00edc, manipulac\u00ed s kl\u00ed\u010dem lze dos\u00e1hnout sn\u00ed\u017een\u00ed po\u010d\u00edtadla odkaz\u016f (pokud certifik\u00e1t nen\u00ed d\u016fv\u011bryhodn\u00fd, odkaz na objekt je uvoln\u011bn po ur\u010den\u00ed typu kl\u00ed\u010de) a uvoln\u011bn\u00ed pam\u011bti pod dal\u0161\u00edm pou\u017eit\u00fdm objektem s kl\u00ed\u010dem. Zkouman\u00e1 nedostatka nevylu\u010duje vytvo\u0159en\u00ed exploit\u016f pro uspo\u0159\u00e1d\u00e1n\u00ed \u00faniku informac\u00ed z pam\u011bti a prov\u00e1d\u011bn\u00ed vlastn\u00edho k\u00f3du. <\/p>\n

\u00datok na server<\/a> se prov\u00e1d\u00ed prost\u0159ednictv\u00edm zasl\u00e1n\u00ed klientem vlastn\u00edm certifik\u00e1tu pro autentizaci klienta s pou\u017eit\u00edm metod EAP-TLS, EAP-TTLS, EAP-PEAP a EAP-TNC. \u00datok na klienta m\u016f\u017ee b\u00fdt proveden prost\u0159ednictv\u00edm vr\u00e1cen\u00ed serverem<\/a> speci\u00e1ln\u011b p\u0159ipraven\u00e9ho certifik\u00e1tu. Zranitelnost se projevuje ve verz\u00edch strongSwan 5.9.8 a 5.9.9. Publikaci aktualizac\u00ed bal\u00ed\u010dk\u016f v distribuc\u00edch lze sledovat na str\u00e1nk\u00e1ch: Debian, Ubuntu, Gentoo, RHEL, SUSE, Arch, FreeBSD, NetBSD.
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0414\u043e\u0441\u0442\u0443\u043f\u0435\u043d \u0432\u044b\u043f\u0443\u0441\u043a strongSwan 5.9.10, \u0441\u0432\u043e\u0431\u043e\u0434\u043d\u043e\u0433\u043e \u043f\u0430\u043a\u0435\u0442\u0430 \u0434\u043b\u044f \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f VPN-\u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0439 \u043d\u0430 \u0431\u0430\u0437\u0435 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 IPSec, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u043e\u0433\u043e \u0432 Linux, Android, FreeBSD \u0438 macOS. \u0412 \u043d\u043e\u0432\u043e\u0439 \u0432\u0435\u0440\u0441\u0438\u0438 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u043e\u043f\u0430\u0441\u043d\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2023-26463), \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0430 \u0434\u043b\u044f \u043e\u0431\u0445\u043e\u0434\u0430 \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438, \u043d\u043e \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u0442\u0430\u043a\u0436\u0435 \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044e \u043a\u043e\u0434\u0430 \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0435\u0433\u043e \u043d\u0430 \u0441\u0442\u043e\u0440\u043e\u043d\u0435 \u0441\u0435\u0440\u0432\u0435\u0440\u0430 \u0438\u043b\u0438 \u043a\u043b\u0438\u0435\u043d\u0442\u0430. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043f\u0440\u0438 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0435 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u044b\u0445 \u0441\u0435\u0440\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0432 […]<\/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-107077","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 strongSwan IPsec umo\u017e\u0148uj\u00edc\u00ed vzd\u00e1len\u00e9 prov\u00e1d\u011bn\u00ed k\u00f3du | ProHoster","description":"Byla vyd\u00e1na verze strongSwan 5.9.10, svobodn\u00e9ho bal\u00ed\u010dku pro vytv\u00e1\u0159en\u00ed VPN p\u0159ipojen\u00ed zalo\u017een\u00fdch na protokolu IPSec, pou\u017e\u00edvan\u00e9ho na Linuxu, 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