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Ubuntu Security Notice USN-6182-1
June 21, 2023

pngcheck 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 pngcheck.

Software Description:
- pngcheck: Verifies the integrity of PNG, JNG and MNG files

Details:

It was discovered that pngcheck incorrectly handled certain inputs. If a
user or an automated system were tricked into opening a specially crafted
input file, a remote attacker could possibly use this issue to cause a
denial of service.

Update instructions:

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

Ubuntu 20.04 LTS:
   pngcheck                        2.3.0-7ubuntu0.20.04.1

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
   pngcheck                        2.3.0-7ubuntu0.18.04.1~esm1

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
   pngcheck                        2.3.0-7ubuntu0.16.04.1~esm1

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

References:
   https://ubuntu.com/security/notices/USN-6182-1
   CVE-2020-27818, CVE-2020-35511

Package Information:
   https://launchpad.net/ubuntu/+source/pngcheck/2.3.0-7ubuntu0.20.04.1