All Vulnerability Reports

USN-4182-3: Intel Microcode regression


Severity

High

Vendor

Canonical Ubuntu

Versions Affected
  • Canonical Ubuntu 16.04
Description

USN-4182-1 provided updated Intel Processor Microcode. A regression was discovered that caused some Skylake processors to hang after a warm reboot. This update reverts the microcode for that specific processor family.

We apologize for the inconvenience.

Original advisory details:

Stephan van Schaik, Alyssa Milburn, Sebastian Österlund, Pietro Frigo, Kaveh Razavi, Herbert Bos, Cristiano Giuffrida, Giorgi Maisuradze, Moritz Lipp, Michael Schwarz, Daniel Gruss, and Jo Van Bulck discovered that Intel processors using Transactional Synchronization Extensions (TSX) could expose memory contents previously stored in microarchitectural buffers to a malicious process that is executing on the same CPU core. A local attacker could use this to expose sensitive information. (CVE-2019-11135)

It was discovered that certain Intel Xeon processors did not properly restrict access to a voltage modulation interface. A local privileged attacker could use this to cause a denial of service (system crash). (CVE-2019-11139)

CVEs contained in this USN include: CVE-2019-11135, CVE-2019-11139

Affected Pivotal Products and Versions

Severity is high 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.

  • Pivotal Application Service
    • 2.8.x versions prior to 2.8.1
    • 2.7.x versions prior to 2.7.7
    • 2.6.x versions prior to 2.6.13
    • 2.5.x versions prior to 2.5.18
  • PCF Isolation Segment
    • 2.8.x versions prior to 2.8.1
    • 2.7.x versions prior to 2.7.7
    • 2.6.x versions prior to 2.6.12
    • 2.5.x versions prior to 2.5.17
  • Pivotal Operations Manager
    • 2.7.x versions prior to 2.7.8
    • 2.6.x versions prior to 2.6.18
    • 2.5.x versions prior to 2.5.26
Mitigation

Users of affected products are strongly encouraged to follow one of the mitigations below. The Cloud Foundry security team recommends upgrading BOSH to 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:

  • Pivotal Application Service
    • 2.8.1
    • 2.7.7
    • 2.6.13
    • 2.5.18
  • PCF Isolation Segment
    • 2.8.1
    • 2.7.7
    • 2.6.12
    • 2.5.17
  • Pivotal Operations Manager
    • 2.7.8
    • 2.6.18
    • 2.5.26
References