[USN-4628-3] Intel Microcode vulnerabilities

========================================================================== Ubuntu Security Notice USN-4628-3 May 17, 2021
intel-microcode vulnerabilities ==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 21.04 – Ubuntu 20.10 – Ubuntu 20.04 LTS – Ubuntu 18.04 LTS
Summary:
Several security issues were fixed in Intel Microcode.
Software Description: – intel-microcode: Processor microcode for Intel CPUs
Details:
USN-4628-1 provided updated Intel Processor Microcode for various processor types. This update provides the corresponding updates for some additional processor types.
Original advisory details:
Moritz Lipp, Michael Schwarz, Andreas Kogler, David Oswald, Catherine Easdon, Claudio Canella, and Daniel Gruss discovered that the Intel Running Average Power Limit (RAPL) feature of some Intel processors allowed a side- channel attack based on power consumption measurements. A local attacker could possibly use this to expose sensitive information. (CVE-2020-8695)
Ezra Caltum, Joseph Nuzman, Nir Shildan and Ofir Joseff discovered that some Intel(R) Processors did not properly remove sensitive information before storage or transfer in some situations. A local attacker could possibly use this to expose sensitive information. (CVE-2020-8696)
Ezra Caltum, Joseph Nuzman, Nir Shildan and Ofir Joseff discovered that some Intel(R) Processors did not properly isolate shared resources in some situations. A local attacker could possibly use this to expose sensitive information. (CVE-2020-8698)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 21.04: intel-microcode 3.20210216.0ubuntu0.21.04.1
Ubuntu 20.10: intel-microcode 3.20210216.0ubuntu0.20.10.1
Ubuntu 20.04 LTS: intel-microcode 3.20210216.0ubuntu0.20.04.1
Ubuntu 18.04 LTS: intel-microcode 3.20210216.0ubuntu0.18.04.1
After a standard system update you need to reboot your computer to make all the necessary changes.
References: ubuntu.com/security/notices/USN-4628-3 ubuntu.com/security/notices/USN-4628-1 CVE-2020-8695, CVE-2020-8696, CVE-2020-8698
Package Information: launchpad.net/ubuntu/+source/intel-microcode/3.20210216.0ubuntu0.21.04.1 launchpad.net/ubuntu/+source/intel-microcode/3.20210216.0ubuntu0.20.10.1 launchpad.net/ubuntu/+source/intel-microcode/3.20210216.0ubuntu0.20.04.1 launchpad.net/ubuntu/+source/intel-microcode/3.20210216.0ubuntu0.18.04.1