Information Exposure
When a `SecurityManager` is configured, a web application's ability to read system properties should be controlled by the `SecurityManager`. In Apache Tomcat, the system property replacement feature for configuration files could be used by a malicious web application to bypass the SecurityManager and read system properties that should not be visible.
Incorrect Authorization
The ResourceLinkFactory implementation in Apache Tomcat 9.0.0.M1 to 9.0.0.M9, 8.5.0 to 8.5.4, 8.0.0.RC1 to 8.0.36, 7.0.0 to 7.0.70 and 6.0.0 to 6.0.45 does not limit web application access to global JNDI resources to those resources explicitly linked to the web application. Therefore, it was possible for a web application to access any global JNDI resource whether an explicit ResourceLink had been configured or not.
Apache Tomcat vulnerable to SecurityManager bypass
A malicious web application running on Apache Tomcat 9.0.0.M1 to 9.0.0.M9, 8.5.0 to 8.5.4, 8.0.0.RC1 to 8.0.36, 7.0.0 to 7.0.70 and 6.0.0 to 6.0.45 was able to bypass a configured SecurityManager via manipulation of the configuration parameters for the JSP Servlet.
Information Exposure Through Timing Discrepancy
The Realm implementations in Apache Tomcat does not process the supplied password if the supplied user name did not exist which makes it possible to use a timing attack to determine valid user names.