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AUSCERT External Security Bulletin Redistribution
Intel BIOS Platform Sample Code Advisory
11 November 2020
AusCERT Security Bulletin Summary
Product: Intel BIOS Platform Sample Code
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Increased Privileges -- Existing Account
CVE Names: CVE-2020-8764 CVE-2020-8740 CVE-2020-8739
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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
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.
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
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
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
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
2nd Generation Intel Xeon Scalable Processors, Intel Core X-series Processors,
Intel Xeon Processor W Family and Intel Xeon Scalable Processors
Intel Xeon Processor D Family, Intel Xeon Processor E7 v4 Family and Intel Xeon
Processor E5 v3 Family, Intel Xeon Processor E5 v4 Family
Intel Xeon Processor D Family
Intel Xeon Processor E7 v3 Family
Intel Atom Processor C3XXX
Intel recommends that users of the affected products update to the latest BIOS
firmware provided by the system manufacturer that addresses these issues.
Intel would like to thank Dmitry Frolov (CVE-2020-8738) for reporting this
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 Date Description
1.0 11/10/2020 Initial Release
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