libxml2 vulnerabilities

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

* Ubuntu 19.10
* Ubuntu 18.04 LTS
* Ubuntu 16.04 LTS
* Ubuntu 14.04 ESM
* Ubuntu 12.04 ESM

Summary

Several security issues were fixed in libxml2.

Software Description

* libxml2 - GNOME XML library

Details

It was discovered that libxml2 incorrectly handled certain XML
files. An attacker could possibly use this issue to cause a denial
of service. (CVE-2019-19956, CVE-2020-7595)

Update instructions

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

Ubuntu 19.10
libxml2 - 2.9.4+dfsg1-7ubuntu3.1
libxml2-utils - 2.9.4+dfsg1-7ubuntu3.1

Ubuntu 18.04 LTS
libxml2 - 2.9.4+dfsg1-6.1ubuntu1.3
libxml2-utils - 2.9.4+dfsg1-6.1ubuntu1.3

Ubuntu 16.04 LTS
libxml2 - 2.9.3+dfsg1-1ubuntu0.7
libxml2-utils - 2.9.3+dfsg1-1ubuntu0.7

Ubuntu 14.04 ESM
libxml2 - 2.9.1+dfsg1-3ubuntu4.13+esm1
libxml2-utils - 2.9.1+dfsg1-3ubuntu4.13+esm1

Ubuntu 12.04 ESM
libxml2 - 2.7.8.dfsg-5.1ubuntu4.22
libxml2-utils - 2.7.8.dfsg-5.1ubuntu4.22

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

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

References

* CVE-2019-19956
* CVE-2020-7595

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