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AUSCERT External Security Bulletin Redistribution
Intel BSSA DFT Advisory
14 July 2021
AusCERT Security Bulletin Summary
Product: Intel Processors
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Increased Privileges -- Existing Account
CVE Names: CVE-2021-0144
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Intel ID: INTEL-SA-00525
Advisory Category: Firmware
Impact of vulnerability : Escalation of Privilege
Severity rating : HIGH
Original release: 07/13/2021
Last revised: 07/13/2021
A potential security vulnerability in the customer build time configuration for
the Intel BIOS Shared SW Architecture (BSSA) Design for Test (DFT) feature may
allow escalation of privilege. Intel is releasing detailed guidance to address
this potential vulnerability.
Description: Insecure default variable initialization for the Intel BSSA DFT
feature may allow a privileged user to potentially enable an escalation of
privilege via local access.
CVSS Base Score: 7.5 High
CVSS Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
o 2nd Generation Intel Xeon Scalable Processors
o Intel Xeon Scalable Processors
o Intel Core X-series Processors
o Intel Xeon Processor W Family
o Intel Xeon Processor D Family
o Intel Xeon Processor E5 v4 Family
o Intel Xeon Processor E5 v3 Family
Intel recommends that users of the potentially affected products update to the
latest BIOS firmware version provided by the system manufacturer that addresses
Intel would like to thank Nvidia for reporting this issue.
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 07/13/2021 Initial Release
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