Two security vulnerabilities have been found in the Tomcat servlet and JSP engine.
When Apache Tomcat is configured with the JMX Remote Lifecycle Listener, a
local attacker without access to the Tomcat process or configuration files is
able to manipulate the RMI registry to perform a man-in-the-middle attack to
capture user names and passwords used to access the JMX interface. The attacker
can then use these credentials to access the JMX interface and gain complete
control over the Tomcat instance.
When using FORM authentication with Apache Tomcat there was a narrow window
where an attacker could perform a session fixation attack. The window was
considered too narrow for an exploit to be practical but, erring on the side of
caution, this issue has been treated as a security vulnerability.
For Debian 7 Wheezy, these problems have been fixed in version 7.0.28-4+deb7u23.
We recommend that you upgrade your tomcat7 packages.
Further information about Extended LTS security advisories can be found in the dedicated section of our website.