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Security Advisory

USN-4263-1: Sudo vulnerability

USN-4263-1: Sudo vulnerability




Canonical Ubuntu

Versions Affected

  • Canonical Ubuntu 16.04
  • Canonical Ubuntu 18.04


Joe Vennix discovered that Sudo incorrectly handled memory operations when the pwfeedback option is enabled. A local attacker could possibly use this issue to obtain unintended access to the administrator account.

CVEs contained in this USN include: CVE-2019-18634.

Affected Cloud Foundry Products and Versions

Severity is low unless otherwise noted.

  • cflinuxfs3
    • All versions prior to 0.161.0
  • Xenial Stemcells
    • 621.x versions prior to 621.55
    • 456.x versions prior to 456.96
    • 315.x versions prior to 315.167
    • 250.x versions prior to 250.181
    • 170.x versions prior to 170.201
    • 97.x versions prior to 97.230
    • All other stemcells not listed.
  • CF Deployment
      • All versions prior to v12.31.0


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 0.161.0 or greater
  • Xenial Stemcells
    • Upgrade 621.x versions to 621.55 or greater
    • Upgrade 456.x versions to 456.96 or greater
    • Upgrade 315.x versions to 315.167 or greater
    • Upgrade 250.x versions to 250.181 or greater
    • Upgrade 170.x versions to 170.201 or greater
    • Upgrade 97.x versions to 97.230 or greater
    • All other stemcells should be upgraded to the latest version available onĀ
  • CF Deployment
    • Upgrade All versions to v12.31.0 or greater


2020-02-03: Initial vulnerability report published.

Cloud Foundry Foundation Security Team Profile Image

Cloud Foundry Foundation Security Team, AUTHOR