sudo - several issues

Several vulnerabilities have been discovered in sudo, a program designed
to allow a sysadmin to give limited root privileges to users. The Common
Vulnerabilities and Exposures project identifies the following problems:

• CVE-2013-1775
  Marco Schoepl discovered an authentication bypass when the clock is
  set to the UNIX epoch [00:00:00 UTC on 1 January 1970].
• CVE-2013-1776
  Ryan Castellucci and James Ogden discovered aspects of an issue that
  would allow session id hijacking from another authorized tty.

For the stable distribution (squeeze), these problems have been fixed in
version 1.7.4p4-2.squeeze.4.

For the testing (wheezy) and unstable (sid) distributions, these problems
have been fixed in version 1.8.5p2-1+nmu1.

We recommend that you upgrade your sudo packages.