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Security Advisory

USN-4360-4: json-c vulnerability

USN-4360-4: json-c vulnerability




Canonical Ubuntu

Versions Affected

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


USN-4360-1 fixed a vulnerability in json-c. The security fix introduced a memory leak that was reverted in USN-4360-2 and USN-4360-3. This update provides the correct fix update for CVE-2020-12762.

Original advisory details:

It was discovered that json-c incorrectly handled certain JSON files. An attacker could possibly use this issue to execute arbitrary code.

CVEs contained in this USN include: CVE-2020-12762.

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

  • cflinuxfs3
    • All versions prior to 0.189.0
  • Xenial Stemcells
    • 170.x versions prior to 170.221
    • 250.x versions prior to 250.200
    • 315.x versions prior to 315.185
    • 456.x versions prior to 456.114
    • 621.x versions prior to 621.76
    • All other stemcells not listed.
  • CF Deployment
    • All versions prior to v13.5.0


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 0.189.0 or greater
  • Xenial Stemcells
    • Upgrade 170.x versions to 170.221 or greater
    • Upgrade 250.x versions to 250.200 or greater
    • Upgrade 315.x versions to 315.185 or greater
    • Upgrade 456.x versions to 456.114 or greater
    • Upgrade 621.x versions to 621.76 or greater
    • All other stemcells should be upgraded to the latest version available on
  • CF Deployment
    • Upgrade All versions to v13.5.0 or greater


2020-05-28: Initial vulnerability report published.

Cloud Foundry Foundation Security Team Profile Image

Cloud Foundry Foundation Security Team, AUTHOR