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.
http://lists.apple.com/archives/security-announce/2013/Sep/msg00002.html
http://lists.apple.com/archives/security-announce/2015/Aug/msg00001.html
http://lists.opensuse.org/opensuse-updates/2013-03/msg00066.html
http://rhn.redhat.com/errata/RHSA-2013-1353.html
http://rhn.redhat.com/errata/RHSA-2013-1701.html
https://support.apple.com/kb/HT205031
http://support.apple.com/kb/HT5880
http://www.debian.org/security/2013/dsa-2642
http://www.openwall.com/lists/oss-security/2013/02/27/22
http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html