CVE-2013-1418

La función setup_server_realm en main.c en Key Distribution Center (KDC) de MIT Kerberos 5 (también conocido como krb5) anterior a la versión 1.10.7, cuando se configuran varios campos, permite a atacantes remotos provocar una denegación de servicio (referencia a un puntero NULL y cierre del demonio) a través de una petición manipulada.

It was found that if a KDC served multiple realms, certain requests could cause the setup_server_realm() function to dereference a NULL pointer. A remote, unauthenticated attacker could use this flaw to crash the KDC using a specially crafted request.

Kerberos is an authentication system which allows clients and services to authenticate to each other with the help of a trusted third party, a Kerberos Key Distribution Center. It was found that if a KDC served multiple realms, certain requests could cause the setup_server_realm() function to dereference a NULL pointer. A remote, unauthenticated attacker could use this flaw to crash the KDC using a specially crafted request. A NULL pointer dereference flaw was found in the MIT Kerberos SPNEGO acceptor for continuation tokens. A remote, unauthenticated attacker could use this flaw to crash a GSSAPI-enabled server application.