Severity

Critical

Vendor

Canonical Ubuntu

Versions Affected

• Canonical Ubuntu 14.04

Description

USN-3522-2 fixed a vulnerability in the Linux Hardware Enablement kernel for Ubuntu 14.04 LTS to address Meltdown (CVE-2017-5754). Unfortunately, that update introduced a regression where a few systems failed to boot successfully. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

Jann Horn discovered that microprocessors utilizing speculative execution and indirect branch prediction may allow unauthorized memory reads via sidechannel attacks. This flaw is known as Meltdown. A local attacker could use this to expose sensitive information, including kernel memory.

Affected Cloud Foundry Products and Versions

Severity is critical unless otherwise noted.

• Cloud Foundry BOSH stemcells are vulnerable, including:
  • 3312.x versions prior to 3312.49
  • 3363.x versions prior to 3363.45
  • 3421.x versions prior to 3421.35
  • 3445.x versions prior to 3445.21
  • 3468.x versions prior to 3468.16
  • All other stemcells not listed.

Mitigation

OSS users are strongly encouraged to follow one of the mitigations below:

• The Cloud Foundry project recommends upgrading the following BOSH stemcells:
  • Upgrade 3312.x versions to 3312.49
  • Upgrade 3363.x versions to 3363.45
  • Upgrade 3421.x versions to 3421.35
  • Upgrade 3445.x versions to 3445.21
  • Upgrade 3468.x versions to 3468.16
  • All other stemcells should be upgraded to the latest version available on bosh.io.

References

• USN-3522-4
• CVE-2017-5754