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Security Advisory

USN-6467-2: Kerberos vulnerability




Canonical Ubuntu

Versions Affected

  • Canonical Ubuntu 22.04


USN-6467-1 fixed a vulnerability in Kerberos. This update provides the corresponding update for Ubuntu 20.04 LTS, Ubuntu 22.04 LTS and Ubuntu 23.04. Original advisory details: Robert Morris discovered that Kerberos did not properly handle memory access when processing RPC data through kadmind, which could lead to the freeing of uninitialized memory. An authenticated remote attacker could possibly use this issue to cause kadmind to crash, resulting in a denial of service. Update Instructions: Run `sudo pro fix USN-6467-2` to fix the vulnerability. The problem can be corrected by updating your system to the following package versions: libk5crypto3 – 1.17-6ubuntu4.4 krb5-kpropd – 1.17-6ubuntu4.4 libkdb5-9 – 1.17-6ubuntu4.4 krb5-user – 1.17-6ubuntu4.4 libgssrpc4 – 1.17-6ubuntu4.4 libkrb5support0 – 1.17-6ubuntu4.4 krb5-doc – 1.17-6ubuntu4.4 libkrb5-dev – 1.17-6ubuntu4.4 krb5-pkinit – 1.17-6ubuntu4.4 libkrb5-3 – 1.17-6ubuntu4.4 krb5-kdc-ldap – 1.17-6ubuntu4.4 krb5-otp – 1.17-6ubuntu4.4 krb5-gss-samples – 1.17-6ubuntu4.4 krb5-multidev – 1.17-6ubuntu4.4 krb5-locales – 1.17-6ubuntu4.4 libgssapi-krb5-2 – 1.17-6ubuntu4.4 krb5-kdc – 1.17-6ubuntu4.4 libkrad-dev – 1.17-6ubuntu4.4 krb5-k5tls – 1.17-6ubuntu4.4 libkrad0 – 1.17-6ubuntu4.4 libkadm5srv-mit11 – 1.17-6ubuntu4.4 libkadm5clnt-mit11 – 1.17-6ubuntu4.4 krb5-admin-server – 1.17-6ubuntu4.4 No subscription required

CVEs contained in this USN include: CVE-2023-36054.

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

  • cflinuxfs4
    • All versions prior to 1.50.0
  • 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 1.50.0 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