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Security Advisory

USN-6450-1: OpenSSL vulnerabilities




Canonical Ubuntu

Versions Affected

  • Canonical Ubuntu 22.04


Tony Battersby discovered that OpenSSL incorrectly handled key and initialization vector (IV) lengths. This could lead to truncation issues and result in loss of confidentiality for some symmetric cipher modes. (CVE-2023-5363) Juerg Wullschleger discovered that OpenSSL incorrectly handled the AES-SIV cipher. This could lead to empty data entries being ignored, resulting in certain applications being misled. This issue only affected Ubuntu 22.04 LTS and Ubuntu 23.04. (CVE-2023-2975) It was discovered that OpenSSL incorrectly handled checking excessively long DH keys or parameters. A remote attacker could possibly use this issue to cause OpenSSL to consume resources, leading to a denial of service. This issue only affected Ubuntu 22.04 LTS and Ubuntu 23.04. (CVE-2023-3446, CVE-2023-3817) Update Instructions: Run `sudo pro fix USN-6450-1` to fix the vulnerability. The problem can be corrected by updating your system to the following package versions: libssl-dev – 3.0.2-0ubuntu1.12 openssl – 3.0.2-0ubuntu1.12 libssl-doc – 3.0.2-0ubuntu1.12 libssl3 – 3.0.2-0ubuntu1.12 No subscription required

CVEs contained in this USN include: CVE-2023-3446, CVE-2023-3817, CVE-2023-2975, CVE-2023-5363.

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

  • cflinuxfs4
    • All versions prior to 1.47.0
  • Jammy Stemcells
    • 1.x versions prior to 1.289
    • All other stemcells not listed.
  • CF Deployment
    • All versions with Jammy Stemcells prior to 1.289


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 1.47.0 or greater
  • Jammy Stemcells
    • Upgrade 1.x versions to 1.289 or greater
    • All other stemcells should be upgraded to the latest version available on
  • CF Deployment
    • For all versions, upgrade Jammy Stemcells to 1.289 or greater


2023-11-09: Initial vulnerability report published.

Cloud Foundry Foundation Security Team Profile Image

Cloud Foundry Foundation Security Team, AUTHOR