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[FAQ] Bluetooth Low Energy – unexpected public key crash (SweynTooth)

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As part of the TI Product Security Incident Response Team (PSIRT) process, we would like to notify you about the potential vulnerability of unexpected public key crash as mentioned part of the SweynTooth vulnerabilities.

CVEID: CVE-2019-17520

Summary

The Bluetooth Low Energy peripheral implementation in our SimpleLink™ SDK allows reception of the Secure Manager Protocol (SMP) public key packet even when legacy pairing procedure is used. This can allow attackers in radio range to potentially crash the device via a crafted packet resulting in a denial of service.

When the Bluetooth Low Energy device that is configured in peripheral role performs the legacy pairing procedure, it is possible to cause a device hard fault by sending an SMP public key packet before the SMP pairing procedure starts. If this behavior is not properly handled in the application, the device can potentially enter a dead-lock state, leading to denial of service.

CVSS base score: 5.7

CVSS vector:  https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected products

Here is the list of affected Bluetooth Low Energy SDKs:

  • CC2640R2 SDK, BLE-STACK (SDK v3.30.00.20 and prior versions)
  • CC2640R2 SDK, BLE5-STACK (SDK v3.30.00.20 and prior versions)
  • CC13X2-26X2-SDK, BLE5-STACK (SDK v3.30.00.03 and prior versions)
  • CC1350 SDK, BLE-STACK (SDK v3.20.xx and prior versions)
  • CC26x0 BLE-STACK (BLE-STACK v2.2.0, v2.2.1, v2.2.2 and v2.2.3)

Impacted features

The potential vulnerability can impact Bluetooth Low Energy devices running affected SDK versions that have configured the devices as a Bluetooth Low Energy peripheral and legacy pairing procedure is enabled.

Suggested mitigations

The following service-pack release addresses the potential vulnerability:

Affected SDK

SDK version with mitigations

SDK releases with mitigations

CC2640R2 SDK, BLE-STACK

SDK v3.40.00.10  at http://software-dl.ti.com/simplelink/esd/simplelink_cc2640r2_sdk/3.40.00.10/exports/release_notes_simplelink_cc2640r2_sdk_3_40_00_10.html

10-Jan-2020

CC2640R2 SDK, BLE5-STACK

CC13X2-26X2-SDK, BLE5-STACK

SDK v3.40.00.02 at http://software-dl.ti.com/simplelink/esd/simplelink_cc13x2_26x2_sdk/3.40.00.02/exports/docs/Documentation_Overview.html ,

20-Dec-2019 

CC13x0 SDK, BLE-STACK

SDK v4.10.xx at http://www.ti.com/tool/SIMPLELINK-CC13X0-SDK

20-Mar-2020

BLE-STACK (support for CC2640/CC2650 )

BLE-STACK v2.2.4 at http://www.ti.com/tool/BLE-STACK

16-Mar-2020 

[1] Consider subscribing to “Alert Me” at the corresponding SDK download links to be notified of the new SDK releases.

External references

Disclaimer

TI PROVIDES THIS INFORMATION, INCLUDING THE CVSS (COMMON VULNERABILITY SCORING SYSTEM) SCORE, “AS IS” AND WITH ALL FAULTS, AND DISCLAIMS ALL WARRANTIES, EXPRESS AND IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY RIGHTS. THE CVSS SCORE WAS CALCULATED WITH THE CVSS 3.0 CALCULATOR AND IS BASED ON TI AVAILABLE INFORMATION AND TI ESTIMATES.

This resource is intended for skilled developers designing with TI products. You are solely responsible for (1) selecting the appropriate TI products for your application, (2) designing, validating and testing your application, and (3) ensuring your application meets applicable standards, and any other safety, security, or other requirements. This resource is subject to change without notice. TI grants you permission to use this resource only for development of an application that uses the TI products described in the resource. Other reproduction and display of these resources is prohibited. No license is granted to any other TI intellectual property right or to any third party intellectual property right. TI disclaims responsibility for, and you will fully indemnify TI and its representatives against, any claims, damages, costs, losses, and liabilities arising out of your use of these resources.

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Regards,

Evan Wakefield

Please click the "This Resolved My Issue" button on this post if it answers your question

1 Reply

  • Updated scope of affected BLE_STACK SDK versions for CC26x0 devices to only those versions that support the LE Secure Connections pairing feature.

    Regards,

    Evan Wakefield

    Please click the "This Resolved My Issue" button on this post if it answers your question

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