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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.2012
           Intel Processors Software Developer Guidance Advisory
                                9 June 2021

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Intel Processors
Publisher:         Intel
Operating System:  Windows
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Access Confidential Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-0089 CVE-2021-0086 

Original Bulletin: 
   https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00516.html

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Intel ID:                 INTEL-SA-00516
Advisory Category:        Hardware
Impact of vulnerability : Information Disclosure
Severity rating :         MEDIUM
Original release:         06/08/2021
Last revised:             06/08/2021

Summary:

Potential security vulnerabilities in some Intel Processors may allow
information disclosure. Intel is releasing updated software developer
prescriptive guidance to address these potential vulnerabilities.

Vulnerability Details:

CVEID: CVE-2021-0086

Description: Observable response discrepancy in floating-point operations for
some Intel(R) Processors may allow an authorized user to potentially enable
information disclosure via local access.

CVSS Base Score: 6.5 Medium

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

CVEID: CVE-2021-0089

Description: Observable response discrepancy in some Intel(R) Processors may
allow an authorized user to potentially enable information disclosure via local
access.

CVSS Base Score: 6.5 Medium

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

Affected Products:

All Intel Processor families.

Recommendations:

For CVE-2021-0086 Intel recommends that affected software including web browser
JavaScript engine that runs on Intel Processors follow one of the below
guidelines:

o Process isolation.

o Use alternatives to NaN-boxing techniques (eg. Dedicated type tag).

o Constraining FP results before potential type-confused usage.

Additional technical details can be found here .

For CVE-2021-0089 Intel recommends that affected software that runs on Intel
Processors follow one of the below guidelines:

o Process isolation.

o Place serializing operations between code gen and execution.

o Place LFENCE-semantic operations between code gen and execution.

o Options include LFENCE, SYSCALL/SYSRET

Additional technical details can be found here .

Acknowledgements:

Intel would like to thank Enrico Barberis, Hany Ragab, Herbert Bos, and
Cristiano Giuffrida from the VUSec group at VU Amsterdam for reporting these
issues.

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      06/08/2021 Initial Release

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