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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 invalid connection request as mentioned part of the SweynTooth vulnerabilities.
The Bluetooth Low Energy peripheral implementation in our SimpleLink™ SDK can allow reception of the connection indication packet with invalid parameters. This can allow attackers in radio range to potentially crash the device via a crafted packet resulting in a denial of service.
Potential behavior in devices using SimpleLink™ SDK with BLE-STACK:
When the Bluetooth Low Energy peripheral device receives an invalid connection PDU (invalid connection interval or supervision timeout parameters), a connection is attempted by the device. However, the connection does not succeed due to reception of invalid parameters. The connection fail status is indicated by the Bluetooth Low Energy stack to the application layer (bleGAPConnNotAcceptable). The “Simple Peripheral” example application that TI provides enters an idle state upon receiving the connection fail notification from the Bluetooth Low Energy stack and does not re-initiate advertisements again. This can potentially lead to a denial of service at an application level.
Potential behavior in devices using SimpleLink™ SDK with BLE5-STACK:
When the Bluetooth Low Energy peripheral device receives an invalid connection PDU (invalid connection interval or supervision timeout parameters), the device RF core notifies the BLE5-STACK of the invalid condition and BLE5-STACK enters a hang condition. This could leads to a denial of service at an application level.
CVSS base score: 6.8
CVSS vector: https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Here is the list of affected Bluetooth Low Energy SDKs:
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 enabled connectable advertisements.
The following service-pack release addresses the potential vulnerability:
SDK version with mitigations
SDK releases with mitigations
CC2640R2 SDK BLE-STACK
SDK v3.40.00.10 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
CC2640R2 SDK BLE5-STACK
Released planned for early April 2020 or before. 
Release planned for early April 2020 or before. 
BLE-STACK (support for CC2540/CC2541)
CC13x0 SDK, BLE-STACK
SDK v4.10.xx at http://www.ti.com/tool/SIMPLELINK-CC13X0-SDK
BLE-STACK (support for CC2640/CC2650)
BLE-STACK v2.2.4 at http://www.ti.com/tool/BLE-STACK
 Consider subscribing to “Alert Me” at the corresponding SDK download links to be notified of the new SDK releases.
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.
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