[USN-3504-1] libxml2 vulnerability

[Leonidas S. Barbosa]

==========================================================================
Ubuntu Security Notice USN-3504-1
December 05, 2017

libxml2 vulnerability
==========================================================================

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

- Ubuntu 17.10
- Ubuntu 17.04
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

libxml2 could be made to crash if it opened a specially crafted
file.

Software Description:
- libxml2: GNOME XML library

Details:

Wei Lei discovered that libxml2 incorrecty handled certain parameter
entities. An attacker could use this issue with specially constructed
XML data to cause libxml2 to consume resources, leading to a denial of
service.

Update instructions:

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

Ubuntu 17.10:
  libxml2                         2.9.4+dfsg1-4ubuntu1.1
  libxml2-utils                   2.9.4+dfsg1-4ubuntu1.1
  python-libxml2                  2.9.4+dfsg1-4ubuntu1.1
  python3-libxml2                 2.9.4+dfsg1-4ubuntu1.1

Ubuntu 17.04:
  libxml2                         2.9.4+dfsg1-2.2ubuntu0.2
  libxml2-utils                   2.9.4+dfsg1-2.2ubuntu0.2
  python-libxml2                  2.9.4+dfsg1-2.2ubuntu0.2
  python3-libxml2                 2.9.4+dfsg1-2.2ubuntu0.2

Ubuntu 16.04 LTS:
  libxml2                         2.9.3+dfsg1-1ubuntu0.4
  libxml2-utils                   2.9.3+dfsg1-1ubuntu0.4
  python-libxml2                  2.9.3+dfsg1-1ubuntu0.4

Ubuntu 14.04 LTS:
  libxml2                         2.9.1+dfsg1-3ubuntu4.11
  libxml2-utils                   2.9.1+dfsg1-3ubuntu4.11
  python-libxml2                  2.9.1+dfsg1-3ubuntu4.11

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

References:
  https://www.ubuntu.com/usn/usn-3504-1
  CVE-2017-16932

Package Information:
  https://launchpad.net/ubuntu/+source/libxml2/2.9.4+dfsg1-4ubuntu1.1
  https://launchpad.net/ubuntu/+source/libxml2/2.9.4+dfsg1-2.2ubuntu0.2
  https://launchpad.net/ubuntu/+source/libxml2/2.9.3+dfsg1-1ubuntu0.4
  https://launchpad.net/ubuntu/+source/libxml2/2.9.1+dfsg1-3ubuntu4.11
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