[USN-3739-1] libxml2 vulnerabilities

[Leonidas S. Barbosa]

==========================================================================
Ubuntu Security Notice USN-3739-1
August 14, 2018

libxml2 vulnerabilities
==========================================================================

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

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in libxml2.

Software Description:
- libxml2: GNOME XML library

Details:

Matias Brutti discovered that libxml2 incorrectly handled certain XML
files. An attacker could possibly use this issue to expose sensitive
information. (CVE-2016-9318)

It was discovered that libxml2 incorrectly handled certain files.
An attacker could possibly use this issue to cause a denial of service.
This issue only affected Ubuntu 18.04 LTS. (CVE-2017-16932)

It was discovered that libxml2 incorrectly handled certain files.
An attacker could possibly use this issue to cause a denial of service.
(CVE-2017-18258, CVE-2018-14404, CVE-2018-14567)

Update instructions:

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

Ubuntu 18.04 LTS:
  libxml2                         2.9.4+dfsg1-6.1ubuntu1.2
  libxml2-utils                   2.9.4+dfsg1-6.1ubuntu1.2
  python-libxml2                  2.9.4+dfsg1-6.1ubuntu1.2
  python3-libxml2                 2.9.4+dfsg1-6.1ubuntu1.2

Ubuntu 16.04 LTS:
  libxml2                         2.9.3+dfsg1-1ubuntu0.6
  libxml2-utils                   2.9.3+dfsg1-1ubuntu0.6
  python-libxml2                  2.9.3+dfsg1-1ubuntu0.6

Ubuntu 14.04 LTS:
  libxml2                         2.9.1+dfsg1-3ubuntu4.13
  libxml2-utils                   2.9.1+dfsg1-3ubuntu4.13
  python-libxml2                  2.9.1+dfsg1-3ubuntu4.13

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

References:
  https://usn.ubuntu.com/usn/usn-3739-1
  CVE-2016-9318, CVE-2017-16932, CVE-2017-18258, CVE-2018-14404,
  CVE-2018-14567

Package Information:
  https://launchpad.net/ubuntu/+source/libxml2/2.9.4+dfsg1-6.1ubuntu1.2
  https://launchpad.net/ubuntu/+source/libxml2/2.9.3+dfsg1-1ubuntu0.6
  https://launchpad.net/ubuntu/+source/libxml2/2.9.1+dfsg1-3ubuntu4.13
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