CVE-2014-5352

La función krb5_gss_process_context_token en lib/gssapi/krb5/process_context_token.c en la libraría libgssapi_krb5 en MIT Kerberos 5 (también conocido como krb5) hasta 1.11.5, 1.12.x hasta 1.12.2, y 1.13.x anterior a 1.13.1 no mantiene correctamente los manejos en el contexto de seguridad, lo que permite a usuarios remotos autenticados causar una denegación de servicio (uso después de liberación y doble liberación, y caída del demonio) o posiblemente ejecutar código arbitrario a través de trafico GSSAPI manipulado, tal y como fue demostrado por trafico a kadmind.

A use-after-free flaw was found in the way the MIT Kerberos libgssapi_krb5 library processed valid context deletion tokens. An attacker able to make an application using the GSS-API library (libgssapi) call the gss_process_context_token() function could use this flaw to crash that application.

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. A buffer overflow was found in the KADM5 administration server when it was used with an LDAP back end for the KDC database. A remote, authenticated attacker could potentially use this flaw to execute arbitrary code on the system running kadmind. A use-after-free flaw was found in the way the MIT Kerberos libgssapi_krb5 library processed valid context deletion tokens. An attacker able to make an application using the GSS-API library call the gss_process_context_token() function could use this flaw to crash that application.