USN-4635-1: Kerberos vulnerability | Cloud Foundry

Severity

Medium

Vendor

Canonical Ubuntu

Versions Affected

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

Description

Demi Obenour discovered that Kerberos incorrectly handled certain ASN.1. An attacker could possibly use this issue to cause a denial of service.

CVEs contained in this USN include: CVE-2020-28196.

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

• cflinuxfs3
  • All versions prior to 0.211.0
• Xenial Stemcells
  • 315.x versions prior to 315.202
  • 456.x versions prior to 456.129
  • 621.x versions prior to 621.93
  • All other stemcells not listed.
• CF Deployment
  • All versions prior to 15.4.0

Mitigation

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 0.211.0 or greater
• Xenial Stemcells
  • Upgrade 315.x versions to 315.202 or greater
  • Upgrade 456.x versions to 456.129 or greater
  • Upgrade 621.x versions to 621.93 or greater
  • All other stemcells should be upgraded to the latest version available on bosh.io.
• CF Deployment
  • Upgrade All versions to 15.4.0 or greater

References

• USN Notice
• CVE-2020-28196

History

2021-01-13: Initial vulnerability report published.