It was reported  that, within the kadmin protocol, the access controls for get_strings/set_string were insufficient; anyone with global list privileges could get or modify string attributed on any principal.
It was also noted that the exposure depends on how generous the kadmind acl was with list permissions and whether or not string attributes were used in deployment (and noting that nothing in the core code uses them yet).
This has been fixed upstream  and in Fedora .
This flaw was introduced in krb5 1.10, so only affected Fedora 17 (in current development). It has been fixed there; earlier versions of Fedora or Red Hat Enterprise Linux are not affected.
Not vulnerable. This issue did not affect the versions of krb5 as shipped with Red Hat Enterprise Linux 4, 5, or 6.