6.4 - USN-3519-1

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

- Ubuntu 17.04 - Ubuntu 16.04 LTS - Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in Tomcat.

Software Description: - tomcat8: Servlet and JSP engine - tomcat7: Servlet and JSP engine

Details:

It was discovered that Tomcat incorrectly handled certain pipelined requests when sendfile was used. A remote attacker could use this issue to obtain wrong responses possibly containing sensitive information. (CVE-2017-5647)

It was discovered that Tomcat incorrectly used the appropriate facade object. A malicious application could possibly use this to bypass Security Manager restrictions. (CVE-2017-5648)

It was discovered that Tomcat incorrectly handled error pages. A remote attacker could possibly use this issue to replace or remove the custom error page. (CVE-2017-5664)

It was discovered that Tomcat incorrectly handled the CORS filter. A remote attacker could possibly use this issue to perform cache poisoning. (CVE-2017-7674)

Update instructions:

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

Ubuntu 17.04:
libtomcat8-java 8.0.38-2ubuntu2.2
tomcat8 8.0.38-2ubuntu2.2

Ubuntu 16.04 LTS:
libtomcat8-java 8.0.32-1ubuntu1.5
tomcat8 8.0.32-1ubuntu1.5

Ubuntu 14.04 LTS:
libtomcat7-java 7.0.52-1ubuntu0.13
tomcat7 7.0.52-1ubuntu0.13

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

References:
https://www.ubuntu.com/usn/usn-3519-1
CVE-2017-5647, CVE-2017-5648, CVE-2017-5664, CVE-2017-7674

Package Information:
https://launchpad.net/ubuntu/+source/tomcat8/8.0.38-2ubuntu2.2
https://launchpad.net/ubuntu/+source/tomcat8/8.0.32-1ubuntu1.5
https://launchpad.net/ubuntu/+source/tomcat7/7.0.52-1ubuntu0.13