Medium: microcode_ctl

Issue Overview:

A new domain bypass transient execution attack known as Special Register Buffer Data Sampling (SRBDS) has been found. This flaw allows data values from special internal registers to be leaked by an attacker able to execute code on any core of the CPU. An unprivileged, local attacker can use this flaw to infer values returned by affected instructions known to be commonly used during cryptographic operations that rely on uniqueness, secrecy, or both. (CVE-2020-0543)

Incomplete cleanup from specific special register read operations in some Intel® Processors may allow an authenticated user to potentially enable information disclosure via local access. (CVE-2020-0548)

Cleanup errors in some data cache evictions for some Intel® Processors may allow an authenticated user to potentially enable information disclosure via local access. (CVE-2020-0549)

Affected Packages:

microcode_ctl

Note:

This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.

Issue Correction:
Run yum update microcode_ctl to update your system.

New Packages:

i686:  
    microcode_ctl-2.1-47.amzn2.0.7.i686  
    microcode_ctl-debuginfo-2.1-47.amzn2.0.7.i686  
  
src:  
    microcode_ctl-2.1-47.amzn2.0.7.src  
  
x86_64:  
    microcode_ctl-2.1-47.amzn2.0.7.x86_64  
    microcode_ctl-debuginfo-2.1-47.amzn2.0.7.x86_64  

Additional References

Red Hat: CVE-2020-0543, CVE-2020-0548, CVE-2020-0549

Mitre: CVE-2020-0543, CVE-2020-0548, CVE-2020-0549