CVE-2014-4343

Vulnerabilidad de doble liberación en la función init_ctx_reselect en el iniciador SPNEGO en lib/gssapi/spnego/spnego_mech.c en MIT Kerberos 5 (también conocido como krb5) 1.10.x hasta 1.12.x anterior a 1.12.2 permite a atacantes remotos causar una denegación de servicio (corrupción de memoria) o posiblemente ejecutar código arbitrario a través de trafico de la red que parece venir de un aceptador intencionado, pero especifica un mecanismo de seguridad diferente al propuesto por el iniciador.

A double-free flaw was found in the MIT Kerberos SPNEGO initiators. An attacker able to spoof packets to appear as though they are from an GSSAPI acceptor could use this flaw to crash a client application that uses MIT Kerberos.

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.