A vulnerability has been found and corrected in krb5:

The process_chpw_request function in schpw.c in the password-changing
functionality in kadmind in MIT Kerberos 5 (aka krb5) 1.7 through 1.9
frees an invalid pointer, which allows remote attackers to execute
arbitrary code or cause a denial of service (daemon crash) via a
crafted request that triggers an error condition (CVE-2011-0285).

The updated packages have been patched to correct this issue.