=========================================================================
Ubuntu Security Notice USN-4040-1
June 26, 2019

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

- Ubuntu 19.04
- Ubuntu 18.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Expat could be made to consume a high amount of RAM and CPU resources
if it received a specially crafted XML file.

Software Description:
- expat: XML parsing C library

Details:

It was discovered that Expat incorrectly handled certain XML files.
An attacker could possibly use this issue to cause a denial of service.

Update instructions:

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

Ubuntu 19.04:
  libexpat1                       2.2.6-1ubuntu0.19.04

Ubuntu 18.10:
  libexpat1                       2.2.6-1ubuntu0.18.10

Ubuntu 18.04 LTS:
  libexpat1                       2.2.5-3ubuntu0.1

Ubuntu 16.04 LTS:
  lib64expat1                     2.1.0-7ubuntu0.16.04.4
  libexpat1                       2.1.0-7ubuntu0.16.04.4

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

References:
  https://usn.ubuntu.com/4040-1
  CVE-2018-20843

Package Information:
  https://launchpad.net/ubuntu/+source/expat/2.2.6-1ubuntu0.19.04
  https://launchpad.net/ubuntu/+source/expat/2.2.6-1ubuntu0.18.10
  https://launchpad.net/ubuntu/+source/expat/2.2.5-3ubuntu0.1
  https://launchpad.net/ubuntu/+source/expat/2.1.0-7ubuntu0.16.04.4