Vulnerability identifier: #VU56314

Vulnerability risk: Low

CVSSv3.1: 5.7 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-31609

CWE-ID: CWE-20

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
iWRAP
Hardware solutions / Firmware
DKWT32I-A
Hardware solutions / Firmware
BT Audio Receiver
Hardware solutions / Firmware

Vendor: Silicon Labs
JieLi

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to the Bluetooth Classic implementation does not properly handle the reception of an oversized LMP packet greater than 17 bytes. A remote attacker in radio range can send a specially crafted LMP packet and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

iWRAP: 6.3.0

DKWT32I-A: All versions

BT Audio Receiver: All versions

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External links
http://asset-group.github.io/disclosures/braktooth/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.