Ubuntu 12.04 LTS / 12.10 / 13.10 : libyaml regression (USN-2098-2)

Medium Nessus Plugin ID 72502


The remote Ubuntu host is missing a security-related patch.


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.

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.

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.


Update the affected libyaml-0-2 package.

Plugin Details

Severity: Medium

ID: 72502

File Name: ubuntu_USN-2098-2.nasl

Version: $Revision: 1.4 $

Type: local

Agent: unix

Published: 2014/02/14

Modified: 2016/05/25

Dependencies: 12634

Risk Information

Risk Factor: Medium


Base Score: 6.8

Temporal Score: 5.9

Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P

Temporal Vector: CVSS2#E:ND/RL:OF/RC:C

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:libyaml-0-2, cpe:/o:canonical:ubuntu_linux:12.04:-:lts, cpe:/o:canonical:ubuntu_linux:12.10, cpe:/o:canonical:ubuntu_linux:13.10

Required KB Items: Host/cpu, Host/Ubuntu, Host/Ubuntu/release, Host/Debian/dpkg-l

Exploit Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2014/02/13

Reference Information

BID: 65258

USN: 2098-2