The latest security information on Intel® products.

Microarchitectural Data Sampling Advisory

Intel ID: INTEL-SA-00233
Advisory Category: Hardware
Impact of vulnerability: Information Disclosure
Severity rating: MEDIUM
Original release: 05/14/2019
Last revised: 06/17/2019

Summary:

A potential security vulnerability in CPUs may allow information disclosure.  Intel is releasing Microcode Updates (MCU) updates to mitigate this potential vulnerability.

Vulnerability Details:

CVEID: CVE-2018-12126

Microarchitectural Store Buffer Data Sampling (MSBDS): Store buffers on some microprocessors utilizing speculative execution may allow an authenticated user to potentially enable information disclosure via a side channel with local access.

CVSS Base Score: 6.5 Medium

CVSS Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

 

CVEID: CVE-2018-12127

Microarchitectural Load Port Data Sampling (MLPDS): Load ports on some microprocessors utilizing speculative execution may allow an authenticated user to potentially enable information disclosure via a side channel with local access.

CVSS Base Score: 6.5 Medium

CVSS Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

 

CVEID: CVE-2018-12130

Microarchitectural Fill Buffer Data Sampling (MFBDS): Fill buffers on some microprocessors utilizing speculative execution may allow an authenticated user to potentially enable information disclosure via a side channel with local access.

CVSS Base Score: 6.5 Medium

CVSS Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

 

CVEID: CVE-2019-11091

Microarchitectural Data Sampling Uncacheable Memory (MDSUM): Uncacheable memory on some microprocessors utilizing speculative execution may allow an authenticated user to potentially enable information disclosure via a side channel with local access.

CVSS Base Score: 3.8 Low

CVSS Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N

Affected Products:

A list of impacted products can be found here.

Recommendation:

Intel has worked with operating system vendors, equipment manufacturers, and other ecosystem partners to develop platform firmware and software updates that can help protect systems from these methods. This includes the release of updated Intel microprocessor microcode to our customers and partners. 

Status of available microcode can be found here.

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

End users and systems administrators should check with their system manufacturers and system software vendors and apply any available updates as soon as practical.

In addition, for Intel® SGX, Intel will perform a TCB Recovery operation to enable parties utilizing SGX to determine whether the microcode version related to this Intel Security Advisory has been applied on the platform the SGX attestation request originated from. Intel plans to update the Intel SGX Attestation Service (IAS) Dev environment on June 14th, 2019 and the IAS Production environment on July 12th, 2019, to return “GROUP_OUT_OF_DATE” response for affected platforms without the BIOS applied microcode update, and “CONFIGURATION_NEEDED” response for affected platforms that applied the microcode update through BIOS but with Intel® Hyper-Threading technology enabled.

Acknowledgements:

Microarchitectural Store Buffer Data Sampling (MSBDS) - CVE-2018-12126: This vulnerability was found internally by Intel employees.  Intel would like to thank Ke Sun, Henrique Kawakami, Kekai Hu and Rodrigo Branco. It was independently reported by Lei Shi - Qihoo - 360 CERT and by Marina Minkin1, Daniel Moghimi2, Moritz Lipp3, Michael Schwarz3, Jo Van Bulck4, Daniel Genkin1, Daniel Gruss3, Berk Sunar2, Frank Piessens4, Yuval Yarom5 (1University of Michigan, 2Worcester Polytechnic Institute, 3Graz University of Technology, 4imec-DistriNet, KU Leuven, 5University of Adelaide).

Microarchitectural Load Port Data Sampling (MLPDS) - CVE-2018-12127: This vulnerability was found internally by Intel employees and Microsoft.  Intel would like to thank Brandon Falk – Microsoft Windows Platform Security Team, Ke Sun, Henrique Kawakami, Kekai Hu, and Rodrigo Branco - Intel. It was independently reported by Matt Miller – Microsoft, and by Stephan van Schaik, Alyssa Milburn, Sebastian Österlund, Pietro Frigo, Kaveh Razavi, Herbert Bos, and Cristiano Giuffrida - VUSec group at VU Amsterdam.

Microarchitectural Fill Buffer Data Sampling (MFBDS) - CVE-2018-12130: This vulnerability was found internally by Intel employees.  Intel would like to thank Ke Sun, Henrique Kawakami, Kekai Hu and Rodrigo Branco. It was independently reported by Giorgi Maisuradze – Microsoft Research, and by Dan Horea Lutas, and Andrei Lutas - Bitdefender, and by Volodymyr Pikhur, and by Stephan van Schaik, Alyssa Milburn, Sebastian Österlund, Pietro Frigo, Kaveh Razavi, Herbert Bos, and Cristiano Giuffrida - VUSec group at VU Amsterdam, and by Moritz Lipp, Michael Schwarz, and Daniel Gruss - Graz University of Technology.

Microarchitectural Data Sampling Uncacheable Memory (MDSUM) – CVE-2019-11091: This vulnerability was found internally by Intel employees. Intel would like to thank Ke Sun, Henrique Kawakami, Kekai Hu and Rodrigo Branco. It was independently found by Volodrmyr Pikhur, and by Moritz Lipp, Michael Schwarz, Daniel Gruss - Graz University of Technology, and by Stephan van Schaik, Alyssa Milburn, Sebastian Österlund, Pietro Frigo, Kaveh Razavi, Herbert Bos, and Cristiano Giuffrida - VUSec group at VU Amsterdam.

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 05/14/2019 Initial Release
1.1 06/17/2019 SGX update

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.

Intel and the Intel logo are trademarks of Intel Corporation in the United States and other countries.

*Other names and brands may be claimed as the property of others.
Copyright © Intel Corporation 2019

Report a Vulnerability

If you have information about a security issue or vulnerability with an Intel branded product or technology, please send an e-mail to secure@intel.com. Encrypt sensitive information using our PGP public key.

Please provide as much information as possible, including:

  • The products and versions affected
  • Detailed description of the vulnerability
  • Information on known exploits

A member of the Intel Product Security Team will review your e-mail and contact you to collaborate on resolving the issue. For more information on how Intel works to resolve security issues, see:

For issues related to Intel's external web presence (Intel.com and related subdomains), please contact Intel's External Security Research team.

Need product support?

The secure@intel.com e-mail address should only be used for reporting security issues.

If you...

  • Have questions about the security features of an Intel product
  • Require technical support
  • Want product updates or patches


Please visit Support & Downloads.