The MITRE CVE dictionary describes this issue as:
The check_1_6_dummy function in lib/kadm5/srv/svr_principal.c in kadmind in MIT Kerberos 5 (aka krb5) 1.8.x, 1.9.x, and 1.10.x before 1.10.2 allows remote authenticated administrators to cause a denial of service (NULL pointer dereference and daemon crash) via a KRB5_KDB_DISALLOW_ALL_TIX create request that lacks a password.
Find out more about CVE-2012-1013 from the
MITRE CVE dictionary dictionary and
Not vulnerable. This issue did not affect the versions of krb5 as shipped with Red Hat Enterprise Linux 4 and 5.