[USN-3504-2] libxml2 vulnerability

[Leonidas S. Barbosa]

==========================================================================
Ubuntu Security Notice USN-3504-2
December 05, 2017

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

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

- Ubuntu 12.04 ESM

Summary:

curl could be made to crash if it received specially crafted
input.

Software Description:
- libxml2: GNOME XML library

Details:

USN-3504-1 fixed a vulnerability in libxml2. This update provides
the corresponding update for Ubuntu 12.04 ESM.

Original advisory 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 12.04 ESM:
  libxml2                         2.7.8.dfsg-5.1ubuntu4.19
  libxml2-utils                   2.7.8.dfsg-5.1ubuntu4.19
  python-libxml2                  2.7.8.dfsg-5.1ubuntu4.19

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

References:
  https://www.ubuntu.com/usn/usn-3504-2
  https://www.ubuntu.com/usn/usn-3504-1
  CVE-2017-16932
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