Severity

Unknown

Vendor

Canonical Ubuntu

Versions Affected

• Canonical Ubuntu 16.04
• Canonical Ubuntu 18.04

Description

USN-4233-1 disabled SHA1 being used for digital signature operations in GnuTLS. In certain network environments, certificates using SHA1 may still be in use. This update adds the %VERIFY_ALLOW_BROKEN and %VERIFY_ALLOW_SIGN_WITH_SHA1 priority strings that can be used to temporarily re-enable SHA1 until certificates can be replaced with a stronger algorithm.

Original advisory details:

As a security improvement, this update marks SHA1 as being untrusted for digital signature operations.

Affected VMware Products and Versions

Severity is unknown unless otherwise noted.

Vulnerable Cloud Foundry components individually listed here.

Impacted stemcells may be updated independently of upgrading Pivotal Application Service or PCF Isolation Segment.

• Operations Manager
  • 2.5.x versions prior to 2.5.29
  • 2.6.x versions prior to 2.6.22
  • 2.7.x versions prior to 2.7.12
  • 2.8.x versions prior to 2.8.4
• Pivotal Application Service (PAS)
  • 2.5.x versions prior to 2.5.21
  • 2.6.x versions prior to 2.6.16
  • 2.7.x versions prior to 2.7.10
  • 2.8.x versions prior to 2.8.4
• Pivotal Greenplum for Kubernetes
  • All versions prior to 1.12.0
• Pivotal Isolation Segment
  • 2.6.x versions prior to 2.6.15
  • 2.7.x versions prior to 2.7.10
  • 2.8.x versions prior to 2.8.4
• Pivotal Platform Automation
  • 3.0.x versions prior to 3.0.17
  • 4.0.x versions prior to 4.0.10
  • 4.1.x versions prior to 4.1.10
  • 4.2.x versions prior to 4.2.5

Mitigation

Users of affected products are strongly encouraged to follow the mitigation below. The Cloud Foundry security team recommends upgrading the affected OSS components listed here if applicable. Upgrade Pivotal products that use earlier versions of CF components to new Pivotal releases using new versions linked above. On the Pivotal Network product page for each release, check the Depends On section and/or Release Notes for this information. Releases that have fixed this issue include:

• Operations Manager
  • 2.5.29
  • 2.6.22
  • 2.7.12
  • 2.8.4
• Pivotal Application Service (PAS)
  • 2.5.21
  • 2.6.16
  • 2.7.10
  • 2.8.4
• Pivotal Greenplum for Kubernetes
  • 1.12.0
• Pivotal Isolation Segment
  • 2.6.15
  • 2.7.10
  • 2.8.4
• Pivotal Platform Automation
  • 3.0.17
  • 4.0.10
  • 4.1.10
  • 4.2.5

References

• http://people.ubuntu.com/~ubuntu-security/cve/CVE-2020-1234
• https://usn.ubuntu.com/4233-2/
• https://cloudfoundry.org/blog/usn-4233-2

History

2020-01-23: Initial vulnerability report published.