USN-2098-2: LibYAML regression

Releases

• Ubuntu 13.10
• Ubuntu 12.10
• Ubuntu 12.04

Packages

• 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

• 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

• https://launchpad.net/bugs/1279805