The following security updates are available for Debian:

[DLA 382-1] sudo security update
[DSA 3438-1] xscreensaver security update

[DLA 382-1] sudo security update

Package        : sudo
Version        : 1.7.4p4-2.squeeze.6
CVE ID         : CVE-2015-5602
Debian Bug     : 804149

When sudo is configured to allow a user to edit files under a
directory that they can already write to without using sudo, they can
actually edit (read and write) arbitrary files.  Daniel Svartman
reported that a configuration like this might be introduced
unintentionally if the editable files are specified using wildcards,
for example:

    operator ALL=(root) sudoedit /home/*/*/test.txt

The default behaviour of sudo has been changed so that it does not
allow editing of a file in a directory that the user can write to, or
that is reached by following a symlink in a directory that the user
can write to.  These restrictions can be disabled, but this is
strongly discouraged.

For the oldoldstable distribution (squeeze), this has been fixed in
version 1.7.4p4-2.squeeze.6.

For the oldstable distribution (wheezy) and the stable distribution
(jessie), this will be fixed soon.

[DSA 3438-1] xscreensaver security update

- -------------------------------------------------------------------------
Debian Security Advisory DSA-3438-1 security@debian.org
https://www.debian.org/security/ Michael Gilbert
January 09, 2016 https://www.debian.org/security/faq
- -------------------------------------------------------------------------

Package : xscreensaver
CVE ID : CVE-2015-8025
Debian Bug : 802914

It was discovered that unplugging one of the monitors in a multi-monitor
setup can cause xscreensaver to crash. Someone with physical access to
a machine could use this problem to bypass a locked session.

For the oldstable distribution (wheezy), this problem has been fixed
in version 5.15-3+deb7u1.

For the stable distribution (jessie), this problem has been fixed in
version 5.30-1+deb8u1.

For the testing (stretch) and unstable (sid) distributions, this problem
has been fixed in version 5.34-1.

We recommend that you upgrade your xscreensaver packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/