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Ubuntu Security Notice USN-2098-2

Ubuntu Security Notice USN-2098-2
Posted Feb 13, 2014
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2098-2 - USN-2098-1 fixed a vulnerability in LibYAML. The security fix used introduced a regression that caused parsing failures for certain valid YAML files. This update fixes the problem. Florian Weimer discovered that LibYAML incorrectly handled certain large yaml documents. An attacker could use this issue to cause LibYAML to crash, resulting in a denial of service, or possibly execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary
systems | linux, ubuntu
SHA-256 | 4efd4e0efc0efabf9de7ceae7a958c7cc618c8dde47260642b5eca7eb63ef5a0

Ubuntu Security Notice USN-2098-2

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-2098-2
February 13, 2014

libyaml regression
==========================================================================

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

- Ubuntu 13.10
- Ubuntu 12.10
- Ubuntu 12.04 LTS

Summary:

USN-2098-1 introduced a regression in LibYAML.

Software Description:
- libyaml: Fast YAML 1.1 parser and emitter library

Details:

USN-2098-1 fixed a vulnerability in LibYAML. The security fix used
introduced a regression that caused parsing failures for certain valid YAML
files. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

Florian Weimer discovered that LibYAML incorrectly handled certain large
yaml documents. An attacker could use this issue to cause LibYAML to crash,
resulting in a denial of service, or possibly execute arbitrary code.

Update instructions:

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

Ubuntu 13.10:
libyaml-0-2 0.1.4-2ubuntu0.13.10.2

Ubuntu 12.10:
libyaml-0-2 0.1.4-2ubuntu0.12.10.2

Ubuntu 12.04 LTS:
libyaml-0-2 0.1.4-2ubuntu0.12.04.2

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

References:
http://www.ubuntu.com/usn/usn-2098-2
http://www.ubuntu.com/usn/usn-2098-1
https://launchpad.net/bugs/1279805

Package Information:
https://launchpad.net/ubuntu/+source/libyaml/0.1.4-2ubuntu0.13.10.2
https://launchpad.net/ubuntu/+source/libyaml/0.1.4-2ubuntu0.12.10.2
https://launchpad.net/ubuntu/+source/libyaml/0.1.4-2ubuntu0.12.04.2




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