CVE-2015-5346

Vulnerabilidad de fijación de sesión en Apache Tomcat 7.x en versiones anteriores a 7.0.66, 8.x en versiones anteriores a 8.0.30 y 9.x en versiones anteriores a 9.0.0.M2, cuando se utilizan configuraciones de sesión diferentes para despliegues de múltiples versiones de la misma aplicación web, podría permitir a atacantes remotos secuestrar sesiones web aprovechando el uso de un campo requestedSessionSSL para una petición no intencionada, relacionado con CoyoteAdapter.java y Request.java.

A session fixation flaw was found in the way Tomcat recycled the requestedSessionSSL field. If at least one web application was configured to use the SSL session ID as the HTTP session ID, an attacker could reuse a previously used session ID for further requests.

When recycling the Request object to use for a new request, the requestedSessionSSL field was not recycled. This meant that a session ID provided in the next request to be processed using the recycled Request object could be used when it should not have been. This gave the client the ability to control the session ID. In theory, this could have been used as part of a session fixation attack but it would have been hard to achieve as the attacker would not have been able to force the victim to use the 'correct' Request object. It was also necessary for at least one web application to be configured to use the SSL session ID as the HTTP session ID. This is not a common configuration. Apache Tomcat versions 7.0.5 through 7.0.65, 8.0.0.RC1 through 8.0.30, and 9.0.0.M1 are affected.