CVE-2019-17519

The Bluetooth Low Energy implementation on NXP SDK through 2.2.1 for KW41Z devices does not properly restrict the Link Layer payload length, allowing attackers in radio range to cause a buffer overflow via a crafted packet.

Recent assessments:

pbarry25 at April 19, 2020 2:45am UTC reported:

This vuln is part of a related batch named SweynTooth from researchers at the Singapore University of Technology and Design. The SweynTooth vulnerabilities lie within certain Bluetooth Low Energy (BLE) SDKs for Systems-on-a-Chip (SoC), which can make proliferating fixes to affected devices in the field a slow going.

Vulnerable devices need to be within BLE radio range in order for an attacker to target. A successful exploit will leave the target in a crashed or non-functional state via a Buffer Overflow (BOF), triggered by sending a packet with a large Link Layer Length value. While a simple attack results in a denial-of-service (DoS), the nature of the vulnerability being a BOF leaves the door open for further exploration to potentially gain code execution on a target. A detailed explanation can be found here in the original disclosure, as well as some potentially vulnerable devices in this list. It appears the SoC manufacturer has issued fixes for their vulnerable SDK(s).

Related, the same researchers found an SoC from Cypress which also contained a similar vulnerability (CVE-2019-16336), also disclosed as part of SweynTooth.

EDIT: Attacker Value for this item largely depends on the type of device the vulnerable target is and behavior the device exhibits when successfully exploited.

Assessed Attacker Value: 3
Assessed Attacker Value: 3Assessed Attacker Value: 4