All Vulnerability Reports

USN-4385-2: Intel Microcode regression


Severity

Medium

Vendor

Canonical Ubuntu

Versions Affected
  • Canonical Ubuntu 14.04
  • Canonical Ubuntu 16.04
Description

USN-4385-1 provided updated Intel Processor Microcode. Unfortunately, that update prevented certain processors in the Intel Skylake family (06_4EH) from booting successfully. Additonally, on Ubuntu 20.04 LTS, late loading of microcode was enabled, which could lead to system instability. This update reverts the microcode update for the Skylake processor family and disables the late loading option on Ubuntu 20.04 LTS.

Please note that the dis_ucode_ldr kernel command line option can be added in the boot menu to disable microcode loading for system recovery.

We apologize for the inconvenience.

Original advisory details:

It was discovered that memory contents previously stored in microarchitectural special registers after RDRAND, RDSEED, and SGX EGETKEY read operations on Intel client and Xeon E3 processors may be briefly exposed to processes on the same or different processor cores. A local attacker could use this to expose sensitive information. (CVE-2020-0543)

It was discovered that on some Intel processors, partial data values previously read from a vector register on a physical core may be propagated into unused portions of the store buffer. A local attacker could possible use this to expose sensitive information. (CVE-2020-0548)

It was discovered that on some Intel processors, data from the most recently evicted modified L1 data cache (L1D) line may be propagated into an unused (invalid) L1D fill buffer. A local attacker could possibly use this to expose sensitive information. (CVE-2020-0549)

CVEs contained in this USN include: CVE-2020-0543, CVE-2020-0548, CVE-2020-0549

Affected VMware Products and Versions

Severity is medium unless otherwise noted.

Vulnerable Cloud Foundry components individually listed here. Impacted stemcells may be updated independently of upgrading Tanzu Application Service or Isolation Segment.

  • Isolation Segment
    • 2.7.x versions prior to 2.7.18
    • 2.8.x versions prior to 2.8.12
    • 2.9.x versions prior to 2.9.6
  • Operations Manager
    • 2.7 versions prior to 2.7.19
    • 2.8 versions prior to 2.8.10
    • 2.9 versions prior to 2.9.6
  • VMware Tanzu Application Service for VMs
    • 2.7.x versions prior to 2.7.18
    • 2.8.x versions prior to 2.8.12
    • 2.9.x versions prior to 2.9.6
Mitigation

The Cloud Foundry security team recommends upgrading the affected OSS components listed here if applicable. Upgrade VMware Tanzu products that use earlier versions of CF components to new Tanzu releases using new versions linked above. On the Tanzu 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:

  • Isolation Segment
    • 2.7.18
    • 2.8.12
    • 2.9.6
  • Operations Manager
    • 2.7.19
    • 2.8.10
    • 2.9.6
  • VMware Tanzu Application Service for VMs
    • 2.7.18
    • 2.8.12
    • 2.9.6
References
History

2020-06-10: Initial vulnerability report published.