A Ghostscript security update has been released for Ubuntu Linux 16.04 ESM.

USN-5224-2: Ghostscript vulnerabilities

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Ubuntu Security Notice USN-5224-2
January 13, 2022

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

- Ubuntu 16.04 ESM

Summary:

Several security issues were fixed in Ghostscript.

Software Description:
- ghostscript: PostScript and PDF interpreter

Details:

USN-5224-1 fixed several vulnerabilities in Ghostscript. This update provides
the corresponding update for Ubuntu 16.04 ESM.

Original advisory 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
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 16.04 ESM:
ghostscript 9.26~dfsg+0-0ubuntu0.16.04.14+esm1
libgs9 9.26~dfsg+0-0ubuntu0.16.04.14+esm1

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

References:
https://ubuntu.com/security/notices/USN-5224-2
https://ubuntu.com/security/notices/USN-5224-1
CVE-2021-45944, CVE-2021-45949