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Security Advisory

USN-6242-1: OpenSSH vulnerability




Canonical Ubuntu

Versions Affected

  • Canonical Ubuntu 22.04


It was discovered that OpenSSH incorrectly handled loading certain PKCS#11 providers. If a user forwarded their ssh-agent to an untrusted system, a remote attacker could possibly use this issue to load arbitrary libraries from the user’s system and execute arbitrary code. Update Instructions: Run `sudo pro fix USN-6242-1` to fix the vulnerability. The problem can be corrected by updating your system to the following package versions: openssh-client – 1:8.2p1-4ubuntu0.8 openssh-server – 1:8.2p1-4ubuntu0.8 ssh-askpass-gnome – 1:8.2p1-4ubuntu0.8 ssh – 1:8.2p1-4ubuntu0.8 openssh-tests – 1:8.2p1-4ubuntu0.8 openssh-sftp-server – 1:8.2p1-4ubuntu0.8 No subscription required

CVEs contained in this USN include: CVE-2023-38408.

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

  • cflinuxfs4
    • All versions prior to 1.24.0
  • Jammy Stemcells
    • 1.x versions prior to 1.181
    • All other stemcells not listed.
  • CF Deployment
    • All versions with Jammy Stemcells prior to 1.181


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 1.24.0 or greater
  • Jammy Stemcells
    • Upgrade 1.x versions to 1.181 or greater
    • All other stemcells should be upgraded to the latest version available on
  • CF Deployment
    • For all versions, upgrade Jammy Stemcells to 1.181 or greater


2023-08-10: Initial vulnerability report published.

Cloud Foundry Foundation Security Team Profile Image

Cloud Foundry Foundation Security Team, AUTHOR