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Ubuntu: Security update for Tomcat

It was discovered that Tomcat incorrectly performed certain security constraint checks in the FORM authenticator. A remote attacker could possibly use this flaw with a specially-crafted URI to bypass security constraint checks. It was discovered that Tomcat incorrectly handled requests that lack a session identifier. A remote attacker could possibly use this flaw to bypass the cross-site request forgery protection. It was discovered that Tomcat incorrectly handled sendfile and HTTPS when the NIO connector is used. A remote attacker could use this flaw to cause Tomcat to stop responsing, resulting in a denial of service.

Updated packages are available from security.ubuntu.com.

==========================================================================
Ubuntu Security Notice USN-1685-1
January 14, 2013

tomcat6, tomcat7 vulnerabilities
==========================================================================

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

- Ubuntu 12.10
- Ubuntu 12.04 LTS
- Ubuntu 11.10
- Ubuntu 10.04 LTS

Summary:

Several security issues were fixed in Tomcat.

Software Description:
- tomcat7: Servlet and JSP engine
- tomcat6: Servlet and JSP engine

Details:

It was discovered that Tomcat incorrectly performed certain security
constraint checks in the FORM authenticator. A remote attacker could
possibly use this flaw with a specially-crafted URI to bypass security
constraint checks. This issue only affected Ubuntu 10.04 LTS, Ubuntu 11.10
and Ubuntu 12.04 LTS. (CVE-2012-3546)

It was discovered that Tomcat incorrectly handled requests that lack a
session identifier. A remote attacker could possibly use this flaw to
bypass the cross-site request forgery protection. (CVE-2012-4431)

It was discovered that Tomcat incorrectly handled sendfile and HTTPS when
the NIO connector is used. A remote attacker could use this flaw to cause
Tomcat to stop responsing, resulting in a denial of service. This issue
only affected Ubuntu 10.04 LTS, Ubuntu 11.10 and Ubuntu 12.04 LTS.
(CVE-2012-4534)

Update instructions:

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

Ubuntu 12.10:
 libtomcat7-java                 7.0.30-0ubuntu1.1

Ubuntu 12.04 LTS:
 libtomcat6-java                 6.0.35-1ubuntu3.2

Ubuntu 11.10:
 libtomcat6-java                 6.0.32-5ubuntu1.4

Ubuntu 10.04 LTS:
 libtomcat6-java                 6.0.24-2ubuntu1.12

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

References:
 http://www.ubuntu.com/usn/usn-1685-1
 CVE-2012-3546, CVE-2012-4431, CVE-2012-4534

Package Information:
 https://launchpad.net/ubuntu/+source/tomcat7/7.0.30-0ubuntu1.1
 https://launchpad.net/ubuntu/+source/tomcat6/6.0.35-1ubuntu3.2
 https://launchpad.net/ubuntu/+source/tomcat6/6.0.32-5ubuntu1.4
 https://launchpad.net/ubuntu/+source/tomcat6/6.0.24-2ubuntu1.12
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