=========================================================================Ubuntu Security Notice USN-1359-1
February 13, 2012

tomcat6 vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 11.10
- Ubuntu 11.04
- Ubuntu 10.10
- Ubuntu 10.04 LTS

Summary:

Tomcat could be made to crash or expose sensitive information if it
received specially crafted network traffic.

Software Description:
- tomcat6: Servlet and JSP engine

Details:

It was discovered that Tomcat incorrectly performed certain caching and
recycling operations. A remote attacker could use this flaw to obtain read
access to IP address and HTTP header information in certain cases. This
issue only applied to Ubuntu 11.10. (CVE-2011-3375)

It was discovered that Tomcat computed hash values for form parameters
without restricting the ability to trigger hash collisions predictably.
A remote attacker could cause a denial of service by sending many crafted
parameters. (CVE-2011-4858)

It was discovered that Tomcat incorrectly handled parameters. A remote
attacker could cause a denial of service by sending requests with a large
number of parameters and values. (CVE-2012-0022)

Update instructions:

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

Ubuntu 11.10:
  libtomcat6-java                 6.0.32-5ubuntu1.2

Ubuntu 11.04:
  libtomcat6-java                 6.0.28-10ubuntu2.3

Ubuntu 10.10:
  libtomcat6-java                 6.0.28-2ubuntu1.6

Ubuntu 10.04 LTS:
  libtomcat6-java                 6.0.24-2ubuntu1.10

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

References:
  
  CVE-2011-3375, CVE-2011-4858, CVE-2012-0022

Package Information:
  https://launchpad.net/ubuntu/+source/tomcat6/6.0.32-5ubuntu1.2
  https://launchpad.net/ubuntu/+source/tomcat6/6.0.28-10ubuntu2.3
  https://launchpad.net/ubuntu/+source/tomcat6/6.0.28-2ubuntu1.6
  https://launchpad.net/ubuntu/+source/tomcat6/6.0.24-2ubuntu1.10