tomcat8 - security update

It was discovered that malicious web applications could use the
Expression Language to bypass protections of a Security Manager as
expressions were evaluated within a privileged code section.

For the stable distribution (jessie), this problem has been fixed in
version 8.0.14-1+deb8u1.

For the testing distribution (stretch), this problem has been fixed
in version 8.0.21-2.

For the unstable distribution (sid), this problem has been fixed in
version 8.0.21-2.

We recommend that you upgrade your tomcat8 packages.