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

[USN-6364-1] Ghostscript vulnerabilities

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Ubuntu Security Notice USN-6364-1
September 13, 2023

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

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS (Available with Ubuntu Pro)
- Ubuntu 16.04 LTS (Available with Ubuntu Pro)

Summary:

Several security issues were fixed in Ghostscript.

Software Description:
- ghostscript: PostScript and PDF interpreter

Details:

It was discovered that Ghostscript incorrectly handled certain PDF files.
An attacker could possibly use this issue to cause a denial of service.
(CVE-2020-21710)

It was discovered that Ghostscript incorrectly handled certain PDF files.
An attacker could possibly use this issue to cause a denial of service,
or possibly execute arbitrary code. (CVE-2020-21890)

Update instructions:

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

Ubuntu 20.04 LTS:
ghostscript 9.50~dfsg-5ubuntu4.10
libgs9 9.50~dfsg-5ubuntu4.10

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
ghostscript 9.26~dfsg+0-0ubuntu0.18.04.18+esm2
libgs9 9.26~dfsg+0-0ubuntu0.18.04.18+esm2

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
ghostscript 9.26~dfsg+0-0ubuntu0.16.04.14+esm7
libgs9 9.26~dfsg+0-0ubuntu0.16.04.14+esm7

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

References:
https://ubuntu.com/security/notices/USN-6364-1
CVE-2020-21710, CVE-2020-21890

Package Information:
https://launchpad.net/ubuntu/+source/ghostscript/9.50~dfsg-5ubuntu4.10