krb5: S4U2Self KDC crash when anon is restricted

A NULL pointer dereference flaw was found in MIT Kerberos krb5kdc service. An authenticated attacker could use this flaw to cause krb5kdc to dereference a null pointer and crash by making an S4U2Self request, if the restrictanonymoustotgt option was set to true...

UBUNTU-CVE-2016-3120

The validateasrequest function in kdcutil.c in the Key Distribution Center KDC in MIT Kerberos 5 aka krb5 before 1.13.6 and 1.4.x before 1.14.3, when restrictanonymoustotgt is enabled, uses an incorrect client data structure, which allows remote authenticated users to cause a denial of service NU...