===========================================================================
Ubuntu Security Notice USN-3177-2
February 02, 2017

tomcat6, tomcat7 regression
===========================================================================

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

- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS

Summary:

USN-3177-1 introduced a regression in Tomcat.

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

Details:

USN-3177-1 fixed vulnerabilities in Tomcat. The update introduced a
regression in environments where Tomcat is started with a security manager.
This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

 It was discovered that the Tomcat realm implementations incorrectly handled
 passwords when a username didn't exist. A remote attacker could possibly
 use this issue to enumerate usernames. This issue only applied to Ubuntu
 12.04 LTS, Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2016-0762)
  Alvaro Munoz and Alexander Mirosh discovered that Tomcat incorrectly
 limited use of a certain utility method. A malicious application could
 possibly use this to bypass Security Manager restrictions. This issue only
 applied to Ubuntu 12.04 LTS, Ubuntu 14.04 LTS and Ubuntu 16.04 LTS.
 (CVE-2016-5018)
  It was discovered that Tomcat did not protect applications from untrusted
 data in the HTTP_PROXY environment variable. A remote attacker could
 possibly use this issue to redirect outbound traffic to an arbitrary proxy
 server. This issue only applied to Ubuntu 12.04 LTS, Ubuntu 14.04 LTS and
 Ubuntu 16.04 LTS. (CVE-2016-5388)
  It was discovered that Tomcat incorrectly controlled reading system
 properties. A malicious application could possibly use this to bypass
 Security Manager restrictions. This issue only applied to Ubuntu 12.04 LTS,
 Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2016-6794)
  It was discovered that Tomcat incorrectly controlled certain configuration
 parameters. A malicious application could possibly use this to bypass
 Security Manager restrictions. This issue only applied to Ubuntu 12.04 LTS,
 Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2016-6796)
  It was discovered that Tomcat incorrectly limited access to global JNDI
 resources. A malicious application could use this to access any global JNDI
 resource without an explicit ResourceLink. This issue only applied to
 Ubuntu 12.04 LTS, Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2016-6797)
  Regis Leroy discovered that Tomcat incorrectly filtered certain invalid
 characters from the HTTP request line. A remote attacker could possibly
 use this issue to inject data into HTTP responses. (CVE-2016-6816)
  Pierre Ernst discovered that the Tomcat JmxRemoteLifecycleListener did not
 implement a recommended fix. A remote attacker could possibly use this
 issue to execute arbitrary code. (CVE-2016-8735)
  It was discovered that Tomcat incorrectly handled error handling in the
 send file code. A remote attacker could possibly use this issue to access
 information from other requests. (CVE-2016-8745)
  Paul Szabo discovered that the Tomcat package incorrectly handled upgrades
 and removals. A local attacker could possibly use this issue to obtain
 root privileges. (CVE-2016-9774, CVE-2016-9775)

Update instructions:

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

Ubuntu 14.04 LTS:
  libtomcat7-java                 7.0.52-1ubuntu0.9
  tomcat7                         7.0.52-1ubuntu0.9

Ubuntu 12.04 LTS:
  libtomcat6-java                 6.0.35-1ubuntu3.10
  tomcat6                         6.0.35-1ubuntu3.10

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

References:
  http://www.ubuntu.com/usn/usn-3177-2
  http://www.ubuntu.com/usn/usn-3177-1
  https://launchpad.net/bugs/1659589

Package Information:
  https://launchpad.net/ubuntu/+source/tomcat7/7.0.52-1ubuntu0.9
  https://launchpad.net/ubuntu/+source/tomcat6/6.0.35-1ubuntu3.10