[USN-2461-3] PyYAML vulnerability

Steve Beattie sbeattie at ubuntu.com
Mon Jan 12 22:28:00 UTC 2015

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

pyyaml vulnerability

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

- Ubuntu 14.10
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS


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

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


Stanisław 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.


Package Information:

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