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Intel BIOS Platform Sample Code Advisory

Intel ID: INTEL-SA-00390
Advisory Category: Firmware
Impact of vulnerability: Escalation of Privilege
Severity rating: HIGH
Original release: 11/10/2020
Last revised: 11/10/2020

Summary: 

Potential security vulnerabilities in Intel BIOS platform sample code for some Intel® Processors may allow escalation of privilege.  Intel is releasing BIOS platform sample code updates to mitigate these potential vulnerabilities.

Vulnerability Details:

CVEID: CVE-2020-8764

Description: Improper access control in BIOS firmware for some Intel(R) Processors may allow a privileged user to potentially enable escalation of privilege via local access.

CVSS Base Score: 8.2 High

CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

 

CVEID: CVE-2020-8738

Description: Improper conditions check in Intel BIOS platform sample code for some Intel(R) Processors before may allow a privileged user to potentially enable escalation of privilege via local access.

CVSS Base Score: 7.5 High

CVSS Vector: CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

 

CVEID: CVE-2020-8740

Description: Out of bounds write in Intel BIOS platform sample code for some Intel(R) Processors may allow a privileged user to potentially enable escalation of privilege via local access.

CVSS Base Score: 6.7 Medium

CVSS Vector: CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:L/I:H/A:L

 

CVEID: CVE-2020-8739

Description: Use of potentially dangerous function in Intel BIOS platform sample code for some Intel(R) Processors may allow an authenticated user to potentially enable escalation of privilege via local access.

CVSS Base Score: 4.6 Medium

CVSS Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:L

Affected Products:

2nd Generation Intel® Xeon® Scalable Processors, Intel® Core™ X-series Processors, Intel® Xeon® Processor W Family and Intel® Xeon® Scalable Processors     

  • CVE-2020-8738
  • CVE-2020-8739
  • CVE-2020-8740
  • CVE-2020-8764

Intel® Xeon® Processor D Family, Intel® Xeon® Processor E7 v4 Family and Intel® Xeon® Processor E5 v3 Family, Intel® Xeon® Processor E5 v4 Family

  • CVE-2020-8738
  • CVE-2020-8740
  • CVE-2020-8764

Intel® Xeon® Processor D Family               

  • CVE-2020-8739
  • CVE-2020-8740
  • CVE-2020-8764

Intel® Xeon® Processor E7 v3 Family

  • CVE2020-8764

Intel® Atom® Processor C3XXX

  • CVE-2020-8738

Intel recommends that users of the affected products update to the latest BIOS firmware provided by the system manufacturer that addresses these issues.

Acknowledgements:

Intel would like to thank Dmitry Frolov (CVE-2020-8738) for reporting this issue.

The following issues were found internally by Intel, CVE-2020-8739 and CVE-2020-8764.  Intel would like to thank Brent Holtsclaw for CVE-2020-8740.

Intel, and nearly the entire technology industry, follows a disclosure practice called Coordinated Disclosure, under which a cybersecurity vulnerability is generally publicly disclosed only after mitigations are available.

Revision History

Revision Date Description
1.0 11/10/2020 Initial Release

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Copyright © Intel Corporation 2020

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