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Security Advisory

USN-5380-1: Bash vulnerability

USN-5380-1: Bash vulnerability




Canonical Ubuntu

Versions Affected

  • Canonical Ubuntu 16.04
  • Canonical Ubuntu 18.04


It was discovered that Bash did not properly drop privileges when the binary had the setuid bit enabled. An attacker could possibly use this issue to escalate privileges. Update Instructions: Run `sudo ua fix USN-5380-1` to fix the vulnerability. The problem can be corrected by updating your system to the following package versions: bash-builtins – 4.3-14ubuntu1.4+esm1 bash-doc – 4.3-14ubuntu1.4+esm1 bash – 4.3-14ubuntu1.4+esm1 bash-static – 4.3-14ubuntu1.4+esm1 Available with UA Infra or UA Desktop:

CVEs contained in this USN include: CVE-2019-18276.

Affected Cloud Foundry Products and Versions

Severity is low unless otherwise noted.

  • Bionic Stemcells
    • 1.x versions prior to 1.79
    • All other stemcells not listed.
  • cflinuxfs3
    • All versions prior to 0.287.0
  • CF Deployment
    • All versions prior to 20.2.0, or later versions with Bionic Stemcells prior to 1.79 or Xenial Stemcells prior to 621.241


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

The Cloud Foundry project recommends upgrading the following releases:

  • Bionic Stemcells
    • Upgrade 1.x versions to 1.79 or greater
    • All other stemcells should be upgraded to the latest version available on
  • cflinuxfs3
    • Upgrade all versions to 0.287.0 or greater
  • CF Deployment
    • Upgrade all versions to 20.2.0 or greater, upgrade Bionic Stemcells to 1.79 or greater, and upgrade Xenial Stemcells to 621.241 or greater


2022-05-23: Initial vulnerability report published.

Cloud Foundry Foundation Security Team Profile Image

Cloud Foundry Foundation Security Team, AUTHOR