=========================================================================Ubuntu Security Notice USN-1780-1
March 25, 2013

ruby1.8, ruby1.9.1 vulnerability
=========================================================================
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:

Ruby could be made to hang if it received specially crafted input.

Software Description:
- ruby1.8: Object-oriented scripting language
- ruby1.9.1: Object-oriented scripting language

Details:

Ben Murphy discovered that the Ruby REXML library incorrectly handled XML
entity expansion. An attacker could use this flaw to cause Ruby to consume
large amounts of memory, resulting in a denial of service.

Update instructions:

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

Ubuntu 12.10:
  libruby1.8                      1.8.7.358-4ubuntu0.2
  libruby1.9.1                    1.9.3.194-1ubuntu1.4
  ruby1.8                         1.8.7.358-4ubuntu0.2
  ruby1.9.1                       1.9.3.194-1ubuntu1.4

Ubuntu 12.04 LTS:
  libruby1.8                      1.8.7.352-2ubuntu1.2
  libruby1.9.1                    1.9.3.0-1ubuntu2.6
  ruby1.8                         1.8.7.352-2ubuntu1.2
  ruby1.9.1                       1.9.3.0-1ubuntu2.6

Ubuntu 11.10:
  libruby1.8                      1.8.7.352-2ubuntu0.3
  ruby1.8                         1.8.7.352-2ubuntu0.3

Ubuntu 10.04 LTS:
  libruby1.8                      1.8.7.249-2ubuntu0.3
  ruby1.8                         1.8.7.249-2ubuntu0.3

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

References:
  https://ubuntu.com/security/notices/USN-1780-1
  CVE-2013-1821

Package Information:
  https://launchpad.net/ubuntu/+source/ruby1.8/1.8.7.358-4ubuntu0.2
  https://launchpad.net/ubuntu/+source/ruby1.9.1/1.9.3.194-1ubuntu1.4
  https://launchpad.net/ubuntu/+source/ruby1.8/1.8.7.352-2ubuntu1.2
  https://launchpad.net/ubuntu/+source/ruby1.9.1/1.9.3.0-1ubuntu2.6
  https://launchpad.net/ubuntu/+source/ruby1.8/1.8.7.352-2ubuntu0.3
  https://launchpad.net/ubuntu/+source/ruby1.8/1.8.7.249-2ubuntu0.3