The kadm5_randkey_principal_3 function in lib/kadm5/srv/svr_principal.c in kadmind in MIT Kerberos 5 (aka krb5) before 1.13 sends old keys in a response to a -randkey -keepold request, which allows remote authenticated users to forge tickets by leveraging administrative access.
https://lists.debian.org/debian-lts-announce/2018/01/msg00040.html
https://github.com/krb5/krb5/commit/af0ed4df4dfae762ab5fb605f5a0c8f59cb4f6ca
https://exchange.xforce.ibmcloud.com/vulnerabilities/97028
https://bugzilla.redhat.com/show_bug.cgi?id=1145425
http://www.ubuntu.com/usn/USN-2498-1
http://www.securitytracker.com/id/1031003
http://www.securityfocus.com/bid/70380
http://www.mandriva.com/security/advisories?name=MDVSA-2014:224
http://security.gentoo.org/glsa/glsa-201412-53.xml
http://lists.opensuse.org/opensuse-updates/2015-02/msg00044.html
http://lists.opensuse.org/opensuse-security-announce/2015-02/msg00016.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-March/151103.html
http://lists.fedoraproject.org/pipermail/package-announce/2014-October/140132.html