All Vulnerability Reports

USN-3756-1: Intel Microcode vulnerabilities


Severity

High

Vendor

Canonical Ubuntu

Versions Affected
  • Canonical Ubuntu 14.04
  • Canonical Ubuntu 16.04
Description

It was discovered that memory present in the L1 data cache of an Intel CPU core may be exposed to a malicious process that is executing on the CPU core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local attacker in a guest virtual machine could use this to expose sensitive information (memory from other guests or the host OS). (CVE-2018-3646)

Jann Horn and Ken Johnson discovered that microprocessors utilizing speculative execution of a memory read may allow unauthorized memory reads via a sidechannel attack. This flaw is known as Spectre Variant 4. A local attacker could use this to expose sensitive information, including kernel memory. (CVE-2018-3639)

Zdenek Sojka, Rudolf Marek, Alex Zuepke, and Innokentiy Sennovskiy discovered that microprocessors that perform speculative reads of system registers may allow unauthorized disclosure of system parameters via a sidechannel attack. This vulnerability is also known as Rogue System Register Read (RSRE). An attacker could use this to expose sensitive information. (CVE-2018-3640)

CVEs contained in this USN include: CVE-2018-3639, CVE-2018-3640, CVE-2018-3646

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 includes vulnerable stemcells and container rootfs in the following releases:
    • 2.2.x versions prior to 2.2.5
    • 2.1.x versions prior to 2.1.13
    • 2.0.x versions prior to 2.0.21
  • PCF Isolation Segment includes vulnerable stemcells in the following releases:
    • 2.2.x versions prior to 2.2.5
    • 2.1.x versions prior to 2.1.11
    • 2.0.x versions prior to 2.0.17
  • Pivotal Operations Manager is vulnerable in the following releases:
    • 2.1.x versions prior to 2.1.13
    • 2.2.x versions prior to 2.2.4
    • 2.0.x versions prior to 2.0.23
Mitigation

Users of affected versions should apply the following mitigation:

  • The Cloud Foundry security team recommends upgrading BOSH stemcells and/or other 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: 2.2.5, 2.1.13, 2.0.21
    • PCF Isolation Segment: 2.2.5, 2.1.11, 2.0.17
    • Pivotal Operations Manager: 2.1.13, 2.2.4, 2.0.23
References