sudo before 1.8.12 does not ensure that the TZ environment variable is associated with a zoneinfo file, which allows local users to open arbitrary files for read access (but not view file contents) by running a program within an sudo session, as demonstrated by interfering with terminal output, discarding kernel-log messages, or repositioning tape drives.
https://security.gentoo.org/glsa/201504-02
https://euvd.enisa.europa.eu/vulnerability/EUVD-2014-9490
http://www.sudo.ws/alerts/tz.html
http://www.securitytracker.com/id/1033158