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Security Advisory

USN-6112-1: Perl vulnerability




Canonical Ubuntu

Versions Affected

  • Canonical Ubuntu 16.04
  • Canonical Ubuntu 18.04


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: Run `sudo pro fix USN-6112-1` to fix the vulnerability. The problem can be corrected by updating your system to the following package versions: perl-modules-5.22 – 5.22.1-9ubuntu0.9+esm2 libperl-dev – 5.22.1-9ubuntu0.9+esm2 perl-doc – 5.22.1-9ubuntu0.9+esm2 perl – 5.22.1-9ubuntu0.9+esm2 perl-base – 5.22.1-9ubuntu0.9+esm2 perl-debug – 5.22.1-9ubuntu0.9+esm2 libperl5.22 – 5.22.1-9ubuntu0.9+esm2 Available with Ubuntu Pro (Infra-only):

CVEs contained in this USN include: CVE-2023-31484.

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

  • Bionic Stemcells
    • 1.x versions prior to 1.204
    • All other stemcells not listed.
  • cflinuxfs3
    • All versions prior to 0.369.0
  • CF Deployment
    • All versions prior to 30.0.0, or later versions with Bionic Stemcells prior to 1.204


Users of affected products are strongly encouraged to follow the mitigations below. The Cloud Foundry project recommends upgrading the following releases:

  • Bionic Stemcells
    • Upgrade 1.x versions to 1.204 or greater
    • All other stemcells should be upgraded to the latest version available on
  • cflinuxfs3
    • Upgrade all versions to 0.369.0 or greater
  • CF Deployment
    • Upgrade all versions to 30.0.0 or greater and upgrade Bionic Stemcells to 1.204 or greater


2023-06-29: Initial vulnerability report published.

Cloud Foundry Foundation Security Team Profile Image

Cloud Foundry Foundation Security Team, AUTHOR