A Ghostscript security update has been released for Ubuntu Linux 20.04 LTS, 18.04 LTS, 16.04 LTS.

USN-4469-1: Ghostscript vulnerabilities

==========================================================================
Ubuntu Security Notice USN-4469-1
August 24, 2020

ghostscript vulnerabilities
==========================================================================

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

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in Ghostscript.

Software Description:
- ghostscript: PostScript and PDF interpreter

Details:

It was discovered that Ghostscript incorrectly handled certain document
files. If a user or automated system were tricked into processing a
specially crafted file, a remote attacker could use this issue to cause
Ghostscript to crash, resulting in a denial of service, or possibly
execute arbitrary code.

Update instructions:

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

Ubuntu 20.04 LTS:
ghostscript 9.50~dfsg-5ubuntu4.2
libgs9 9.50~dfsg-5ubuntu4.2

Ubuntu 18.04 LTS:
ghostscript 9.26~dfsg+0-0ubuntu0.18.04.13
libgs9 9.26~dfsg+0-0ubuntu0.18.04.13

Ubuntu 16.04 LTS:
ghostscript 9.26~dfsg+0-0ubuntu0.16.04.13
libgs9 9.26~dfsg+0-0ubuntu0.16.04.13

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

References:
  https://usn.ubuntu.com/4469-1
CVE-2020-16287, CVE-2020-16288, CVE-2020-16289, CVE-2020-16290,
CVE-2020-16291, CVE-2020-16292, CVE-2020-16293, CVE-2020-16294,
CVE-2020-16295, CVE-2020-16296, CVE-2020-16297, CVE-2020-16298,
CVE-2020-16299, CVE-2020-16300, CVE-2020-16301, CVE-2020-16302,
CVE-2020-16303, CVE-2020-16304, CVE-2020-16305, CVE-2020-16306,
CVE-2020-16307, CVE-2020-16308, CVE-2020-16309, CVE-2020-16310,
CVE-2020-17538

Package Information:
  https://launchpad.net/ubuntu/+source/ghostscript/9.50~dfsg-5ubuntu4.2
  https://launchpad.net/ubuntu/+source/ghostscript/9.26~dfsg+0-0ubuntu0.18.04.13
  https://launchpad.net/ubuntu/+source/ghostscript/9.26~dfsg+0-0ubuntu0.16.04.13