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Security Advisory

USN-5446-1: dpkg vulnerability


USN-5446-1: dpkg vulnerability




Canonical Ubuntu

Versions Affected

  • Canonical Ubuntu 18.04


Max Justicz discovered that dpkg incorrectly handled unpacking certain source packages. If a user or an automated system were tricked into unpacking a specially crafted source package, a remote attacker could modify files outside the target unpack directory, leading to a denial of service or potentially gaining access to the system. Update Instructions: Run `sudo ua fix USN-5446-1` to fix the vulnerability. The problem can be corrected by updating your system to the following package versions: dpkg-dev – dselect – libdpkg-dev – dpkg – libdpkg-perl – No subscription required

CVEs contained in this USN include: CVE-2022-1664.

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

  • Bionic Stemcells
    • 1.x versions prior to 1.87
    • All other stemcells not listed.
  • cflinuxfs3
    • All versions prior to 0.301.0
  • CF Deployment
    • All versions prior to 21.0.0, or later versions with Bionic Stemcells prior to 1.87


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 1.87 or greater
    • All other stemcells should be upgraded to the latest version available on
  • cflinuxfs3
    • Upgrade all versions to 0.301.0 or greater
  • CF Deployment
    • Upgrade all versions to 21.0.0 or greater and upgrade Bionic Stemcells to 1.87 or greater


2022-07-28: Initial vulnerability report published.


Cloud Foundry Foundation Security Team Profile Image

Cloud Foundry Foundation Security Team, AUTHOR