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Security Advisory

USN-4243-1: libbsd vulnerabilities

USN-4243-1: libbsd vulnerabilities




Canonical Ubuntu

Versions Affected

  • Canonical Ubuntu 14.04
  • Canonical Ubuntu 16.04
  • Canonical Ubuntu 18.04


It was discovered that libbsd incorrectly handled certain inputs. An attacker could possibly use this issue to execute arbitrary code. This issue only affected Ubuntu 14.04 ESM. (CVE-2016-2090)

It was discovered that libbsd incorrectly handled certain strings. An attacker could possibly use this issue to access sensitive information. (CVE-2019-20367)

CVEs contained in this USN include: CVE-2016-2090, CVE-2019-20367.

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

  • Xenial Stemcells
    • 621.x versions prior to 621.50
    • 456.x versions prior to 456.93
    • 315.x versions prior to 315.163
    • 250.x versions prior to 250.178
    • 170.x versions prior to 170.198
    • 97.x versions prior to 97.226
    • All other stemcells not listed.
  • cflinuxfs3
    • All versions prior to 0.155.0
  • CF Deployment
    • All versions prior to v12.27.0


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

  • Xenial Stemcells
    • Upgrade 621.x versions to 621.50 or greater
    • Upgrade 456.x versions to 456.93 or greater
    • Upgrade 315.x versions to 315.163 or greater
    • Upgrade 250.x versions to 250.178 or greater
    • Upgrade 170.x versions to 170.198 or greater
    • Upgrade 97.x versions to 97.226 or greater
    • All other stemcells should be upgraded to the latest version available on
  • cflinuxfs3
    • Upgrade all versions to 0.155.0 or greater
  • CF Deployment
    • Upgrade all versions to v12.27.0 or greater


2020-01-20: Initial vulnerability report published.

Cloud Foundry Foundation Security Team Profile Image

Cloud Foundry Foundation Security Team, AUTHOR