tomcat7 - security update

Paul Szabo discovered a potential privilege escalation that could be
exploited in the situation envisaged in DLA-622-1. This update also
addresses several regressions stemming from incomplete fixes for
CVE-2015-5345, CVE-2016-5018 and CVE-2016-6797.

For Debian 7 Wheezy, these problems have been fixed in version
7.0.28-4+deb7u8.

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&gt;