[SECURITY] [DLA 623-1] tomcat7 security update

Package : tomcat7
Version : 7.0.28-4+deb7u6
CVE ID : CVE-2016-1240

Dawid Golunski from legalhackers.com discovered that Debian's version
of Tomcat 7 was vulnerable to a local privilege escalation. Local
attackers who have gained access to the server in the context of the
tomcat7 user through a vulnerability in a web application were able to
replace the file with a symlink to an arbitrary file.

The full advisory can be found at

http://legalhackers.com/advisories/Tomcat-Debian-based-Root-Privilege-Escalation-Exploit.txt

In addition this security update also fixes Debian bug #821391. File
ownership in /etc/tomcat7 will no longer be unconditionally overridden
on upgrade. As another precaution the file permissions of Debian
specific configuration files in /etc/tomcat7 were changed to 640 to
disallow world readable access.

For Debian 7 "Wheezy", these problems have been fixed in version
7.0.28-4+deb7u6.

We recommend that you upgrade your tomcat7 packages.

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