Cloud Foundry Logo
blog single gear
Security Advisory

USN-6183-1: Bind vulnerabilities




Canonical Ubuntu

Versions Affected

  • Canonical Ubuntu 22.04


Shoham Danino, Anat Bremler-Barr, Yehuda Afek, and Yuval Shavitt discovered that Bind incorrectly handled the cache size limit. A remote attacker could possibly use this issue to consume memory, leading to a denial of service. (CVE-2023-2828) It was discovered that Bind incorrectly handled the recursive-clients quota. A remote attacker could possibly use this issue to cause Bind to crash, resulting in a denial of service. This issue only affected Ubuntu 22.04 LTS, Ubuntu 22.10, and Ubuntu 23.04. (CVE-2023-2911) Update Instructions: Run `sudo pro fix USN-6183-1` to fix the vulnerability. The problem can be corrected by updating your system to the following package versions: dnsutils – 1:9.16.1-0ubuntu2.15 bind9-libs – 1:9.16.1-0ubuntu2.15 bind9utils – 1:9.16.1-0ubuntu2.15 bind9-doc – 1:9.16.1-0ubuntu2.15 bind9-utils – 1:9.16.1-0ubuntu2.15 bind9 – 1:9.16.1-0ubuntu2.15 bind9-dnsutils – 1:9.16.1-0ubuntu2.15 bind9-host – 1:9.16.1-0ubuntu2.15 No subscription required

CVEs contained in this USN include: CVE-2023-2828, CVE-2023-2911.

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

  • cflinuxfs4
    • All versions prior to 1.21.0
  • Jammy Stemcells
    • 1.x versions prior to 1.147
    • All other stemcells not listed.
  • CF Deployment
    • All versions with Jammy Stemcells prior to 1.147


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

  • cflinuxfs4
    • Upgrade all versions to 1.21.0 or greater
  • Jammy Stemcells
    • Upgrade 1.x versions to 1.147 or greater
    • All other stemcells should be upgraded to the latest version available on
  • CF Deployment
    • For all versions, upgrade Jammy Stemcells to 1.147 or greater


2023-08-04: Initial vulnerability report published.

Cloud Foundry Foundation Security Team Profile Image

Cloud Foundry Foundation Security Team, AUTHOR