USN-4906-1: Nettle vulnerability | Cloud Foundry

Severity

Medium

Vendor

Canonical Ubuntu

Versions Affected

• Canonical Ubuntu 16.04
• Canonical Ubuntu 18.04

Description

It was discovered that Nettle incorrectly handled signature verification. A remote attacker could use this issue to cause Nettle to crash, resulting in a denial of service, or possibly force invalid signatures.

CVEs contained in this USN include: CVE-2021-20305.

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

• cflinuxfs3
  • All versions prior to 0.235.0
• Xenial Stemcells
  • 456.x versions prior to 456.158
  • 621.x versions prior to 621.123
  • All other stemcells not listed.
• CF Deployment
  • All versions prior to 16.13.0

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 0.235.0 or greater
• Xenial Stemcells
  • Upgrade 456.x versions to 456.158 or greater
  • Upgrade 621.x versions to 621.123 or greater
  • All other stemcells should be upgraded to the latest version available on bosh.io.
• CF Deployment
  • Upgrade all versions to 16.13.0 or greater

References

• USN Notice
• CVE-2021-20305

History

2021-04-29: Initial vulnerability report published.