sudo 1.6.0 through 1.7.10p6 and sudo 1.8.0 through 1.8.6p6 allows local users or physically proximate attackers to bypass intended time restrictions and retain privileges without re-authenticating by setting the system clock and sudo user timestamp to the epoch.
https://support.apple.com/kb/HT205031
http://www.ubuntu.com/usn/USN-1754-1
http://www.sudo.ws/sudo/alerts/epoch_ticket.html
http://www.slackware.com/security/viewer.php?l=slackware-security&y=2013&m=slackware-security.517440
http://www.securityfocus.com/bid/58203
http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
http://www.openwall.com/lists/oss-security/2013/02/27/22
http://www.debian.org/security/2013/dsa-2642
http://support.apple.com/kb/HT5880
http://rhn.redhat.com/errata/RHSA-2013-1701.html
http://rhn.redhat.com/errata/RHSA-2013-1353.html
http://lists.opensuse.org/opensuse-updates/2013-03/msg00066.html
http://lists.apple.com/archives/security-announce/2015/Aug/msg00001.html
http://lists.apple.com/archives/security-announce/2013/Sep/msg00002.html