Cloud Foundry Logo
blog single gear
Security Advisory

USN-6390-1: Bind vulnerabilities

USN-6390-1: Bind vulnerabilities




Canonical Ubuntu

Versions Affected

  • Canonical Ubuntu 22.04


It was discovered that Bind incorrectly handled certain control channel messages. A remote attacker with access to the control channel could possibly use this issue to cause Bind to crash, resulting in a denial of service. (CVE-2023-3341) Robert Story discovered that Bind incorrectly handled certain DNS-over-TLS queries. 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, and Ubuntu 23.04. (CVE-2023-4236) Update Instructions: Run `sudo pro fix USN-6390-1` to fix the vulnerability. The problem can be corrected by updating your system to the following package versions: dnsutils – 1:9.18.12-0ubuntu0.22.04.3 bind9-libs – 1:9.18.12-0ubuntu0.22.04.3 bind9utils – 1:9.18.12-0ubuntu0.22.04.3 bind9-dev – 1:9.18.12-0ubuntu0.22.04.3 bind9-doc – 1:9.18.12-0ubuntu0.22.04.3 bind9-utils – 1:9.18.12-0ubuntu0.22.04.3 bind9 – 1:9.18.12-0ubuntu0.22.04.3 bind9-dnsutils – 1:9.18.12-0ubuntu0.22.04.3 bind9-host – 1:9.18.12-0ubuntu0.22.04.3 No subscription required

CVEs contained in this USN include: CVE-2023-3341, CVE-2023-4236.

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

  • cflinuxfs4
    • All versions prior to 1.39.0
  • Jammy Stemcells
    • 1.x versions prior to 1.250
    • All other stemcells not listed.
  • CF Deployment
    • All versions with Jammy Stemcells prior to 1.250


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 1.39.0 or greater
  • Jammy Stemcells
    • Upgrade 1.x versions to 1.250 or greater
    • All other stemcells should be upgraded to the latest version available on
  • CF Deployment
    • For all versions, upgrade Jammy Stemcells to 1.250 or greater


2023-10-05: Initial vulnerability report published.

Cloud Foundry Foundation Security Team Profile Image

Cloud Foundry Foundation Security Team, AUTHOR