Intel CPUs: Access Privileged Data -- Existing Account

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.1994
              Special Register Buffer Data Sampling Advisory
                               10 June 2020

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        AusCERT Security Bulletin Summary
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Product:           Intel CPUs
Publisher:         intel
Operating System:  Windows
                   UNIX variants (UNIX, Linux, OSX)
                   Virtualisation
                   Network Appliance
Impact/Access:     Access Privileged Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-0543  

Original Bulletin: 
   https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00320.html

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Public Security Advisory
Intel Product Security Incident Response Team (PSIRT)
secure@intel.com


Title: Special Register Buffer Data Sampling Advisory
Intel ID: INTEL-SA-00320
Advisory Category: Hardware
Impact of vulnerability: Information Disclosure

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.
https://software.intel.com/security-software-guidance/processors-affected-transient-execution-attack-mitigation-product-cpu-model

Recommendations:

Intel has released microcode updates for the affected processors that are currently supported.
Updates are available on the public github repository.

GitHub*: Public Github: https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files
GitHub* Access:
GitHub* MCU Repository training is available on RDC at this location:
https://cdrdv2.intel.com/v1/dl/getContent/607131
To obtain access to Intel's GitHub* OTCShare:
1) Create a GitHub* account at https://github.com. Your account must include your company
email address as your primary email address.
2) Email your request to mcu_administrator@intel.com with the following information:
a. Name
b. Email address
c. Company name
d. Github user ID
3) Requests typically take 1-2 business days to process. An invitation to the OTCShare
organization will be emailed to the primary email address registered with your GitHub
account. Alternately, you may accept the invitation here: https://github.com/otcshare.
4) After you have accepted the OTCShare invite, you will be added to the MCU repository
within 1-2 business days.

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_DS.
Additional technical details about SRBDS can be found here .

Intel is conduction an SGX TCB recovery in Q3 2020. Refer to Intel® SGX Attestation Technical
Details for more information.

Acknowledgements:

Intel would like to thank Alyssa Milburn, Hany Ragab, Kaveh Razavi, Herbert Bos, Cristiano
Giuffrida 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 history:

Revision: 1.0
Date: 06/09/2020
Description: Initial Release

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