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Ubuntu Security Notice USN-2214-2

Ubuntu Security Notice USN-2214-2
Posted Jun 9, 2014
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2214-2 - USN-2214-1 fixed vulnerabilities in libxml2. The upstream fix introduced a regression when using xmllint with the --postvalid option. This update fixes the problem. Daniel Berrange discovered that libxml2 would incorrectly perform entity substitution even when requested not to. If a user or automated system were tricked into opening a specially crafted document, an attacker could possibly cause resource consumption, resulting in a denial of service. Various other issues were also addressed.

tags | advisory, denial of service, vulnerability
systems | linux, ubuntu
MD5 | 93f526e13d50d8b89634b9b2d8d065ec

Ubuntu Security Notice USN-2214-2

Change Mirror Download
============================================================================
Ubuntu Security Notice USN-2214-2
June 09, 2014

libxml2 regression
============================================================================

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

- Ubuntu 14.04 LTS
- Ubuntu 13.10
- Ubuntu 12.04 LTS
- Ubuntu 10.04 LTS

Summary:

USN-2214-1 introduced a regression in libxml2.

Software Description:
- libxml2: GNOME XML library

Details:

USN-2214-1 fixed vulnerabilities in libxml2. The upstream fix introduced a
regression when using xmllint with the --postvalid option. This update
fixes the problem.

We apologize for the inconvenience.

Original advisory details:

Daniel Berrange discovered that libxml2 would incorrectly perform entity
substitution even when requested not to. If a user or automated system were
tricked into opening a specially crafted document, an attacker could
possibly cause resource consumption, resulting in a denial of service.

Update instructions:

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

Ubuntu 14.04 LTS:
libxml2 2.9.1+dfsg1-3ubuntu4.2

Ubuntu 13.10:
libxml2 2.9.1+dfsg1-3ubuntu2.2

Ubuntu 12.04 LTS:
libxml2 2.7.8.dfsg-5.1ubuntu4.8

Ubuntu 10.04 LTS:
libxml2 2.7.6.dfsg-1ubuntu1.12

In general, a standard system update will make all the necessary changes.

References:
http://www.ubuntu.com/usn/usn-2214-2
http://www.ubuntu.com/usn/usn-2214-1
https://launchpad.net/bugs/1321869

Package Information:
https://launchpad.net/ubuntu/+source/libxml2/2.9.1+dfsg1-3ubuntu4.2
https://launchpad.net/ubuntu/+source/libxml2/2.9.1+dfsg1-3ubuntu2.2
https://launchpad.net/ubuntu/+source/libxml2/2.7.8.dfsg-5.1ubuntu4.8
https://launchpad.net/ubuntu/+source/libxml2/2.7.6.dfsg-1ubuntu1.12
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