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Ubuntu Security Notice USN-2461-3
January 12, 2015

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

- Ubuntu 14.10
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS

Summary:

Applications using PyYAML could be made to crash if they received
specially crafted input.

Software Description:
- pyyaml: YAML parser and emitter for Python

Details:

Stanislaw Pitucha and Jonathan Gray discovered that PyYAML did not
properly handle wrapped strings. An attacker could create specially
crafted YAML data to trigger an assert, causing a denial of service.

Update instructions:

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

Ubuntu 14.10:
  python-yaml                     3.11-1ubuntu0.1
  python3-yaml                    3.11-1ubuntu0.1

Ubuntu 14.04 LTS:
  python-yaml                     3.10-4ubuntu0.1
  python3-yaml                    3.10-4ubuntu0.1

Ubuntu 12.04 LTS:
  python-yaml                     3.10-2ubuntu0.1
  python3-yaml                    3.10-2ubuntu0.1

After a standard system update you need to restart applications using
PyYAML to make all the necessary changes.

References:
  https://www.ubuntu.com/usn/usn-2461-3
  CVE-2014-9130

Package Information:
  https://launchpad.net/ubuntu/+source/pyyaml/3.11-1ubuntu0.1
  https://launchpad.net/ubuntu/+source/pyyaml/3.10-4ubuntu0.1
  https://launchpad.net/ubuntu/+source/pyyaml/3.10-2ubuntu0.1