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intelIntel Security CenterINTEL:INTEL-SA-00707
HistoryJul 12, 2022 - 12:00 a.m.

Intel® Processors RRSBA Advisory

2022-07-1200:00:00
Intel Security Center
www.intel.com
19

Summary:

A potential security vulnerability in some Intel® Processors may allow information disclosure.** **Intel is releasing prescriptive guidance to address this potential vulnerability.

Vulnerability Details:

CVEID: CVE-2022-28693

Description: Unprotected alternative channel of return branch target prediction in some Intel® Processors may allow an authorized user to potentially enable information disclosure via local access.

CVSS Base Score: 4.7 Medium

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

Affected Products:

Some Intel® Processors, consult this list of affected products here.

Recommendations:

Intel recommends that affected Intel® Processors use enhanced Indirect Branch Restricted
Speculation (eIBRS) to address this potential vulnerability even if ‘retpoline’ mitigation is deployed.
Intel is releasing a technical paper to describe the Restricted RSB Alternate (RRSBA) recommendation.

Acknowledgements:

Intel would like to thank Johannes Wikner and Kaveh Razavi from the COMSEC group at ETH Zurich 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.