Advisory Published

USN-4385-1: Intel Microcode vulnerabilities

First published: Tue Jun 09 2020(Updated: )

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)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/intel-microcode<3.20200609.0ubuntu0.20.04.0
3.20200609.0ubuntu0.20.04.0
=20.04
All of
ubuntu/intel-microcode<3.20200609.0ubuntu0.19.10.0
3.20200609.0ubuntu0.19.10.0
=19.10
All of
ubuntu/intel-microcode<3.20200609.0ubuntu0.18.04.0
3.20200609.0ubuntu0.18.04.0
=18.04
All of
ubuntu/intel-microcode<3.20200609.0ubuntu0.16.04.0
3.20200609.0ubuntu0.16.04.0
=16.04
All of
ubuntu/intel-microcode<3.20200609.0ubuntu0.14.04.0
3.20200609.0ubuntu0.14.04.0
=14.04

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Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What are the vulnerabilities addressed in USN-4385-1?

    The vulnerabilities addressed in USN-4385-1 are memory exposure vulnerabilities after RDRAND, RDSEED, and SGX EGETKEY read operations on Intel client and Xeon E3 processors.

  • How can an attacker exploit the vulnerabilities addressed in USN-4385-1?

    A local attacker could exploit the vulnerabilities addressed in USN-4385-1 by accessing memory contents stored in microarchitectural special registers.

  • Which versions of Ubuntu are affected by the vulnerabilities in USN-4385-1?

    The vulnerabilities in USN-4385-1 affect Ubuntu 20.04, 19.10, 18.04, 16.04, and 14.04.

  • What is the remedy for the vulnerabilities addressed in USN-4385-1?

    The remedy for the vulnerabilities addressed in USN-4385-1 is to update the 'intel-microcode' package to version 3.20200609.0ubuntu0.20.04.0 (for Ubuntu 20.04).

  • Where can I find more information about the vulnerabilities in USN-4385-1?

    You can find more information about the vulnerabilities addressed in USN-4385-1 on the official Ubuntu Security website.

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