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Security Advisory

USN-4398-1: DBus vulnerability

USN-4398-1: DBus vulnerability




Canonical Ubuntu

Versions Affected

  • Canonical Ubuntu 16.04
  • Canonical Ubuntu 18.04


Kevin Backhouse discovered that DBus incorrectly handled file descriptors. A local attacker could possibly use this issue to cause DBus to crash, resulting in a denial of service.

CVEs contained in this USN include: CVE-2020-12049.

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

  • cflinuxfs3
    • All versions prior to 0.195.0
  • Xenial Stemcells
    • 170.x versions prior to 170.222
    • 250.x versions prior to 250.201
    • 315.x versions prior to 315.188
    • 456.x versions prior to 456.115
    • 621.x versions prior to 621.77
    • All other stemcells not listed.
  • CF Deployment
    • All versions prior to v13.5.0


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

  • cflinuxfs3
    • Upgrade All versions to 0.195.0 or greater
  • Xenial Stemcells
    • Upgrade 170.x versions to 170.222 or greater
    • Upgrade 250.x versions to 250.201 or greater
    • Upgrade 315.x versions to 315.188 or greater
    • Upgrade 456.x versions to 456.115 or greater
    • Upgrade 621.x versions to 621.77 or greater
    • All other stemcells should be upgraded to the latest version available on
  • CF Deployment
    • Upgrade All versions to v13.5.0 or greater


2020-06-16: Initial vulnerability report published.

Cloud Foundry Foundation Security Team Profile Image

Cloud Foundry Foundation Security Team, AUTHOR