CVE-2016-6796

Una aplicación web maliciosa en Apache Tomcat 9.0.0.M1 a 9.0.0.M9, 8.5.0 a 8.5.4, 8.0.0.RC1 a 8.0.36, 7.0.0 a 7.0.70, y 6.0.0 a 6.0.45 era capaz de eludir un SecurityManager configurado mediante la manipulación de los parámetros de configuración para el Servlet JSP.

It was discovered that a malicious web application could bypass a configured SecurityManager via manipulation of the configuration parameters for the JSP Servlet.

USN-3177-1 fixed vulnerabilities in Tomcat. The update introduced a regression in environments where Tomcat is started with a security manager. This update fixes the problem. It was discovered that the Tomcat realm implementations incorrectly handled passwords when a username didn't exist. A remote attacker could possibly use this issue to enumerate usernames. This issue only applied to Ubuntu 12.04 LTS, Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. Alvaro Munoz and Alexander Mirosh discovered that Tomcat incorrectly limited use of a certain utility method. A malicious application could possibly use this to bypass Security Manager restrictions. Various other issues were also addressed.