A Ghostscript security update has been released for Ubuntu Linux 20.04 LTS and 21.04.

==========================================================================
Ubuntu Security Notice USN-5075-1
September 10, 2021

ghostscript vulnerability
==========================================================================

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

- Ubuntu 21.04
- Ubuntu 20.04 LTS

Summary:

Ghostscript could be made to crash, access files, or run programs if it
opened a specially crafted file.

Software Description:
- ghostscript: PostScript and PDF interpreter

Details:

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

Update instructions:

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

Ubuntu 21.04:
ghostscript 9.53.3~dfsg-7ubuntu0.1
libgs9 9.53.3~dfsg-7ubuntu0.1

Ubuntu 20.04 LTS:
ghostscript 9.50~dfsg-5ubuntu4.3
libgs9 9.50~dfsg-5ubuntu4.3

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

References:
  https://ubuntu.com/security/notices/USN-5075-1
CVE-2021-3781

Package Information:
  https://launchpad.net/ubuntu/+source/ghostscript/9.53.3~dfsg-7ubuntu0.1
  https://launchpad.net/ubuntu/+source/ghostscript/9.50~dfsg-5ubuntu4.3