USN-3177-2: Tomcat regression

Ubuntu Security Notice USN-3177-2

2nd February, 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

• tomcat6
  - Servlet and JSP engine
  
  





• tomcat7
  - 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. ()

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. ()

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. ()

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. ()

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. (,







.

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

References

LP: 1659589