The URL pattern of "" (the empty string) which exactly maps to the
context root was not correctly handled in Apache Tomcat when used as
part of a security constraint definition. This caused the constraint
to be ignored. It was, therefore, possible for unauthorized users to
gain access to web application resources that should have been
protected. Only security constraints with a URL pattern of the empty
string were affected.
Security constraints defined by annotations of Servlets in Apache
Tomcat were only applied once a Servlet had been loaded. Because
security constraints defined in this way apply to the URL pattern
and any URLs below that point, it was possible - depending on the
order Servlets were loaded - for some security constraints not to be
applied. This could have exposed resources to users who were not
authorized to access them.
For Debian 8 "Jessie", these problems have been fixed in version
We recommend that you upgrade your tomcat8 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