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CVE-2019-11135: INTEL-SA-00270

TSX Asynchronous Abort condition on some CPUs utilizing speculative execution may allow an authenticated user to potentially enable information disclosure via a side channel with local access.

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2019.2 IPU – TSX Asynchronous Abort Advisory

**Summary: **

A potential security vulnerability in TSX Asynchronous Abort (TAA) for some Intel® Processors may allow information disclosure. Intel is releasing firmware updates to mitigate this potential vulnerability.

Vulnerability Details:

CVEID: CVE-2019-11135

Description: TSX Asynchronous Abort condition on some CPUs 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

**Affected Products: **

This issue affects all current processors that support Intel© TSX unless IA32_ARCH_CAPABILITIES.TAA_NO (bit 8)=1. On CPUs affected by MDS, where IA32_ARCH_CAPABILITIES.MDS_NO (bit 5)=0, the existing MDS mitigations will also mitigate against TAA.

A list of impacted products can be found here.

**Recommendations:
**

Intel recommends that users of the affected Intel® Processors listed above, update to the latest firmware version provided by the system manufacturer that addresses these issues.

For additional microcode information about the affected products, see here for the generic list of latest microcode updates including those for Intel-SA-00270.

Additional technical details about TAA can be found here.

Additional Advisory Guidance on CVE-2019-11135 available here.

Acknowledgements:

Intel would like to thank the following individuals for finding and reporting the vulnerability to us via coordinated disclosure.

Intel thanks VU Amsterdam, CISPA to coordinate disclosure of TAA after the initial publication of their RIDL paper.

VUSec group at VU Amsterdam: Stephan van Schaik, Alyssa Milburn, Sebastian Österlund, Pietro Frigo, Kaveh Razavi, Herbert Bos, Cristiano Giuffrida.

CISPA Helmholtz Center for Information Security: Giorgi Maisuradze.

Intel thanks TU Graz and KU Leuven to coordinate disclosure of TAA after the initial publication of their ZombieLoad paper.

Graz University of Technology: Moritz Lipp, Michael Schwarz, Daniel Gruss.

KU Leuven: Jo Van Bulck.

Researchers from VUSec group at VU Amsterdam and CISPA Helmholtz Center provided Intel with a Proof of Concept (POC) in September 2018 and researchers from TU Graz and Ku Leuven provided Proof of Concept (POC) in April 2019. Intel subsequently confirmed each submission demonstrates TAA individually.

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

11/12/2019

Initial Release

1.1

11/12/2019

Updated Affected Products & Microcode References

1.2

12/03/2019

Updated Affected Products

1.3

04/21/2020

Updated Affected Products

1.4

09/29/2020

Updated Affected Products

1.5

05/11/2021

Added CVE Additional Guidance Link

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Intel products and services described 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 products that have met their End of Servicing Updates may no longer receive functional and security updates. For additional details on support and servicing, please see this help article.

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 product or component can be absolutely secure. Check with your system manufacturer or retailer or learn more at http://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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