The latest security information on Intel® products.

Special Register Buffer Data Sampling Advisory

Intel ID: INTEL-SA-00320
Advisory Category: Hardware
Impact of vulnerability: Information Disclosure
Severity rating: MEDIUM
Original release: 06/09/2020
Last revised: 06/12/2020

Summary: 

A potential security vulnerability in some Intel® Processors may allow information disclosure.  Intel is releasing firmware updates to mitigate this potential vulnerability.

Vulnerability Details:

CVEID: CVE-2020-0543

Description: Incomplete cleanup from specific special register read operations in some Intel(R) Processors may allow an authenticated 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:

A list of impacted products can be found here

Recommendations:

Intel recommends that users of affected Intel® Processors update to the latest version firmware provided by the system manufacturer that addresses this issue. 

Intel has released microcode updates for the affected Intel® Processors that are currently supported on the public github repository. Please see details below on access to the microcode:

GitHub*: Public Github: https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files

The microcode updates also provide an opt-out mechanism (RNGDS_MITG_DIS) to disable the mitigation for RDRAND and RDSEED instructions executed outside of Intel® Software Guard Extensions (Intel® SGX) enclaves. Please refer to technical details to find additional information on the opt-out mechanism here.

Note that inside of an Intel SGX enclave, the mitigation is applied regardless of the value of RNGDS_MITG_DIS.

Additional technical details about SRBDS can be found here.

To address this issue, an SGX TCB recovery will be required in Q3 2020. Refer to Intel® SGX Attestation Technical Details for more information on the SGX TCB recovery process.

Acknowledgements:

Intel would like to thank Alyssa Milburn, Hany Ragab, Kaveh Razavi, Herbert Bos, Cristiano Giuffrida from the VUSec group at VU Amsterdam for reporting this issue. 

This issue was also identified by Intel employees.  Intel would like to thank Rodrigo Branco (formerly Intel), Kekai Hu (formerly Intel), Gabriel Negreira Barbosa (Intel), and Ke Sun (Intel).

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 06/09/2020 Initial Release
1.1 06/12/2020 Updated Acknowledgements

Legal Notices and Disclaimers

Intel provides these materials as-is, with no express or implied warranties.

All products, dates, and figures specified are preliminary based on current expectations, and are subject to change without notice.

Intel, processors, chipsets, and desktop boards may contain design defects or errors known as errata, which may cause the product to deviate from published specifications. Current characterized errata are available on request.

Intel technologies’ features and benefits depend on system configuration and may require enabled hardware, software or service activation. Performance varies depending on system configuration. No computer system can be absolutely secure. Check with your system manufacturer or retailer or learn more at https://intel.com.

Some results have been estimated or simulated using internal Intel analysis or architecture simulation or modeling, and provided to you for informational purposes. Any differences in your system hardware, software or configuration may affect your actual performance.

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Copyright © Intel Corporation 2020

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