KDC in MIT Kerberos 5 (krb5kdc) does not set a global variable for some krb4 message types, which allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via crafted messages that trigger a NULL pointer dereference or double-free.
https://www.redhat.com/archives/fedora-package-announce/2008-March/msg00544.html
https://www.redhat.com/archives/fedora-package-announce/2008-March/msg00537.html
https://exchange.xforce.ibmcloud.com/vulnerabilities/41275
http://www.vmware.com/security/advisories/VMSA-2008-0009.html
http://www.ubuntu.com/usn/usn-587-1
http://www.kb.cert.org/vuls/id/895609
http://www.gentoo.org/security/en/glsa/glsa-200803-31.xml
http://www.debian.org/security/2008/dsa-1524
http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2008-001.txt
http://marc.info/?l=bugtraq&m=130497213107107&w=2
http://lists.opensuse.org/opensuse-security-announce/2008-03/msg00006.html
http://lists.apple.com/archives/security-announce/2008/Mar/msg00001.html