Kerberos Critical Security Patch

Microsoft released a critical out of cycle patch yesterday (https://technet.microsoft.com/en-us/library/security/MS14-068). The security vulnerability affects Microsoft Windows Kerberos KDCs, allowing remote attackers to elevate unprivileged domain user account privileges to those of the domain administrator account.
We are notifying you of this, as some of our clients use Kerberos to provide seamless logins to their Shibboleth Identity Provider. The vulnerability however is a much larger issue than this, so should be updated regardless of whether you have seamless SSO in place or not.