A Perl security update has been released for Ubuntu Linux 14.04 LTS, 16.04 LTS, and 18.04 LTS.

[USN-6112-1] Perl vulnerability

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Ubuntu Security Notice USN-6112-1
May 29, 2023

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

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS (Available with Ubuntu Pro)
- Ubuntu 14.04 LTS (Available with Ubuntu Pro)

Summary:

Perl could be made to install modules from untrusted sources.

Software Description:
- perl: Practical Extraction and Report Language

Details:

It was discovered that Perl was not properly verifying TLS certificates
when using CPAN together with HTTP::Tiny to download modules over HTTPS.
If a remote attacker were able to intercept communications, this flaw
could potentially be used to install altered modules.

Update instructions:

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

Ubuntu 18.04 LTS:
  perl                            5.26.1-6ubuntu0.7

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
  perl                            5.22.1-9ubuntu0.9+esm2

Ubuntu 14.04 LTS (Available with Ubuntu Pro):
  perl                            5.18.2-2ubuntu1.7+esm5

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

References:
  https://ubuntu.com/security/notices/USN-6112-1
  CVE-2023-31484

Package Information:
  https://launchpad.net/ubuntu/+source/perl/5.26.1-6ubuntu0.7