{"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\/es\/blog\/news\/uyazvimost-v-strongswan-ipsec-dopuskayushhaya-udalyonnoe-vypolnenie-koda","title":{"rendered":"Vulnerabilidad en strongSwan IPsec que permite la ejecuci\u00f3n remota de c\u00f3digo.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Est\u00e1 disponible la versi\u00f3n strongSwan 5.9.10, un paquete libre para crear conexiones VPN basado en el protocolo IPSec, utilizado en Linux, Android, FreeBSD y macOS. En esta nueva versi\u00f3n se ha solucionado una vulnerabilidad cr\u00edtica (CVE-2023-26463), que podr\u00eda ser utilizada para eludir la autenticaci\u00f3n, pero que potencialmente tambi\u00e9n podr\u00eda llevar a la ejecuci\u00f3n de c\u00f3digo del atacante en el lado del servidor o del cliente. El problema se manifiesta al verificar certificados especialmente dise\u00f1ados en los m\u00e9todos de autenticaci\u00f3n EAP (Protocolo de Autenticaci\u00f3n Extensible) basados en TLS. <\/p>\n

La vulnerabilidad se debe a que el manejador TLS acepta incorrectamente claves p\u00fablicas del certificado de un nodo vecino (peer), consider\u00e1ndolas confiables, incluso si el certificado no puede ser verificado con \u00e9xito. En particular, al llamar a la funci\u00f3n tls_find_public_key(), se utiliza un muestreo basado en el tipo de clave p\u00fablica para determinar los certificados de confianza. El problema radica en que la variable utilizada para definir el tipo de clave para la operaci\u00f3n de b\u00fasqueda se establece en cualquier caso, incluso si el certificado no es confiable. <\/p>\n

Adem\u00e1s, mediante la manipulaci\u00f3n de la clave, se puede lograr reducir el contador de referencias (si el certificado no es confiable, la referencia al objeto se libera despu\u00e9s de determinar el tipo de clave) y liberar memoria para otro objeto que todav\u00eda utiliza la clave. La deficiencia discutida no excluye la creaci\u00f3n de exploits para organizar filtraciones de informaci\u00f3n de la memoria y ejecutar su propio c\u00f3digo. <\/p>\n

El ataque a servidor<\/a> se lleva a cabo mediante el env\u00edo por parte del cliente de un certificado autofirmado para la autenticaci\u00f3n del cliente utilizando los m\u00e9todos EAP-TLS, EAP-TTLS, EAP-PEAP y EAP-TNC. Un ataque al cliente puede realizarse a trav\u00e9s del retorno de el servidor<\/a> un certificado especialmente dise\u00f1ado. La vulnerabilidad se manifiesta en las versiones strongSwan 5.9.8 y 5.9.9. Se puede rastrear la publicaci\u00f3n de actualizaciones de paquetes en las distribuciones en las p\u00e1ginas: Debian, Ubuntu, Gentoo, RHEL, SUSE, Arch, FreeBSD, NetBSD.
\n
Fuente: 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 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