=========================================================================Ubuntu Security Notice USN-4108-1
August 21, 2019

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

- Ubuntu 18.04 LTS

Summary:

Zstandard could be made to execute arbitrary code if it received
specially crafted input.

Software Description:
- libzstd: fast lossless compression algorithm -- development files

Details:

It was discovered that Zstandard incorrectly handled certain inputs.
An attacker could possibly use this issue to execute arbitrary code.

Update instructions:

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

Ubuntu 18.04 LTS:
  libzstd1                        1.3.3+dfsg-2ubuntu1.1
  zstd                            1.3.3+dfsg-2ubuntu1.1

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

References:
  https://ubuntu.com/security/notices/USN-4108-1
  CVE-2019-11922

Package Information:
  https://launchpad.net/ubuntu/+source/libzstd/1.3.3+dfsg-2ubuntu1.1