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Security Advisory

USN-4015-1: DBus vulnerability

USN-4015-1: DBus vulnerability




Canonical Ubuntu

Versions Affected

  • Canonical Ubuntu 16.04
  • Canonical Ubuntu 18.04


Joe Vennix discovered that DBus incorrectly handled DBUS_COOKIE_SHA1 authentication. A local attacker could possibly use this issue to bypass authentication and connect to DBus servers with elevated privileges.

CVEs contained in this USN include: CVE-2019-12749

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

  • Cloud Foundry BOSH xenial-stemcells are vulnerable, including:
    • 315.x versions prior to 315.41
    • 250.x versions prior to 250.63
    • 170.x versions prior to 170.82
    • 97.x versions prior to 97.113
    • All other stemcells not listed.
  • All versions of Cloud Foundry cflinuxfs3 prior to 0.101.0


Users of affected products are strongly encouraged to follow one of the mitigations below:

  • The Cloud Foundry project recommends upgrading the following BOSH xenial-stemcells:
    • Upgrade 315.x versions to 315.41
    • Upgrade 250.x versions to 250.63
    • Upgrade 170.x versions to 170.82
    • Upgrade 97.x versions to 97.113
    • All other stemcells should be upgraded to the latest version available on
  • The Cloud Foundry project recommends that Cloud Foundry deployments run with cflinuxfs3 version 0.101.0 or later.


Cloud Foundry Foundation Security Team Profile Image

Cloud Foundry Foundation Security Team, AUTHOR