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Security Advisory

USN-5901-1: GnuTLS vulnerability




Canonical Ubuntu

Versions Affected

  • Canonical Ubuntu 22.04


Hubert Kario discovered that GnuTLS had a timing side-channel when handling certain RSA messages. A remote attacker could possibly use this issue to recover sensitive information. Update Instructions: Run `sudo pro fix USN-5901-1` to fix the vulnerability. The problem can be corrected by updating your system to the following package versions: gnutls-doc – 3.6.13-2ubuntu1.8 libgnutls28-dev – 3.6.13-2ubuntu1.8 libgnutls-openssl27 – 3.6.13-2ubuntu1.8 libgnutls30 – 3.6.13-2ubuntu1.8 libgnutls-dane0 – 3.6.13-2ubuntu1.8 gnutls-bin – 3.6.13-2ubuntu1.8 guile-gnutls – 3.6.13-2ubuntu1.8 libgnutlsxx28 – 3.6.13-2ubuntu1.8 No subscription required

CVEs contained in this USN include: CVE-2023-0361.

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

  • cflinuxfs4
    • All versions prior to 0.67.0
  • Jammy Stemcells
    • 1.x versions prior to 1.93
    • All other stemcells not listed.
  • CF Deployment
    • All versions with Jammy Stemcells prior to 1.93


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

  • cflinuxfs4
    • Upgrade all versions to 0.67.0 or greater
  • Jammy Stemcells
    • Upgrade 1.x versions to 1.93 or greater
    • All other stemcells should be upgraded to the latest version available on
  • CF Deployment
    • For all versions, upgrade Jammy Stemcells to 1.93 or greater


2023-03-23: Initial vulnerability report published.

Cloud Foundry Foundation Security Team Profile Image

Cloud Foundry Foundation Security Team, AUTHOR