USN-3723-1: Tomcat vulnerabilities

25 July 2018

tomcat7, tomcat8 vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS


Several security issues were fixed in Tomcat.

Software Description

  • tomcat8 - Servlet and JSP engine
  • tomcat7 - Servlet and JSP engine


It was discovered that Tomcat incorrectly handled decoding certain UTF-8 strings. A remote attacker could possibly use this issue to cause Tomcat to crash, resulting in a denial of service. (CVE-2018-1336)

It was discovered that the Tomcat WebSocket client incorrectly performed hostname verification. A remote attacker could possibly use this issue to intercept sensitive information. (CVE-2018-8034)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 16.04 LTS
libtomcat8-java - 8.0.32-1ubuntu1.7
tomcat8 - 8.0.32-1ubuntu1.7
Ubuntu 14.04 LTS
libtomcat7-java - 7.0.52-1ubuntu0.15
tomcat7 - 7.0.52-1ubuntu0.15

To update your system, please follow these instructions:

In general, a standard system update will make all the necessary changes.