=========================================================================Ubuntu Security Notice USN-2397-1
November 04, 2014

ruby1.8, ruby1.9.1, ruby2.0, ruby2.1 vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 14.10
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS

Summary:

Several security issues were fixed in Ruby.

Software Description:
- ruby2.0: Object-oriented scripting language
- ruby2.1: Object-oriented scripting language
- ruby1.9.1: Object-oriented scripting language
- ruby1.8: Object-oriented scripting language

Details:

Will Wood discovered that Ruby incorrectly handled the encodes() function.
An attacker could possibly use this issue to cause Ruby to crash, resulting
in a denial of service, or possibly execute arbitrary code. The default
compiler options for affected releases should reduce the vulnerability to a
denial of service. (CVE-2014-4975)

Willis Vandevanter discovered that Ruby incorrectly handled XML entity
expansion. An attacker could use this flaw to cause Ruby to consume large
amounts of resources, resulting in a denial of service. (CVE-2014-8080)

Update instructions:

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

Ubuntu 14.10:
  libruby2.0                      2.0.0.484+really457-3ubuntu1.1
  libruby2.1                      2.1.2-2ubuntu1.1
  ruby2.0                         2.0.0.484+really457-3ubuntu1.1
  ruby2.1                         2.1.2-2ubuntu1.1

Ubuntu 14.04 LTS:
  libruby1.9.1                    1.9.3.484-2ubuntu1.1
  libruby2.0                      2.0.0.484-1ubuntu2.1
  ruby1.9.1                       1.9.3.484-2ubuntu1.1
  ruby2.0                         2.0.0.484-1ubuntu2.1

Ubuntu 12.04 LTS:
  libruby1.8                      1.8.7.352-2ubuntu1.5
  libruby1.9.1                    1.9.3.0-1ubuntu2.9
  ruby1.8                         1.8.7.352-2ubuntu1.5
  ruby1.9.1                       1.9.3.0-1ubuntu2.9

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

References:
  https://ubuntu.com/security/notices/USN-2397-1
  CVE-2014-4975, CVE-2014-8080

Package Information:
  https://launchpad.net/ubuntu/+source/ruby2.0/2.0.0.484+really457-3ubuntu1.1
  https://launchpad.net/ubuntu/+source/ruby2.1/2.1.2-2ubuntu1.1
  https://launchpad.net/ubuntu/+source/ruby1.9.1/1.9.3.484-2ubuntu1.1
  https://launchpad.net/ubuntu/+source/ruby2.0/2.0.0.484-1ubuntu2.1
  https://launchpad.net/ubuntu/+source/ruby1.8/1.8.7.352-2ubuntu1.5
  https://launchpad.net/ubuntu/+source/ruby1.9.1/1.9.3.0-1ubuntu2.9