[USN-1780-1] Ruby vulnerability

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==========================================================================
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:
http://www.ubuntu.com/usn/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