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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:
https://ubuntu.com/security/notices/USN-4628-3
https://ubuntu.com/security/notices/USN-4628-1
CVE-2020-8695, CVE-2020-8696, CVE-2020-8698
Package Information:
https://launchpad.net/ubuntu/+source/intel-microcode/3.20210216.0ubuntu0.21.04.1
https://launchpad.net/ubuntu/+source/intel-microcode/3.20210216.0ubuntu0.20.10.1
https://launchpad.net/ubuntu/+source/intel-microcode/3.20210216.0ubuntu0.20.04.1
https://launchpad.net/ubuntu/+source/intel-microcode/3.20210216.0ubuntu0.18.04.1
