Vulnerability Monitor

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CVE-2021-34147

The Bluetooth Classic implementation in the Cypress WICED BT stack through 2.9.0 for CYW20735B1 does not properly handle the reception of a malformed LMP timing accuracy response followed by multiple reconnections to the link slave, allowing attackers to exhaust device BT resources and eventually trigger a crash via multiple attempts of sending a crafted LMP timing accuracy response followed by a sudden reconnection with a random BDAddress.

Published

2021-09-07T07:15:07.373

Last Modified

2024-11-21T06:09:57.260

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 6.5 (MEDIUM)

CVSSv2 Vector

AV:A/AC:L/Au:N/C:N/I:N/A:C

Access Vector: ADJACENT_NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: COMPLETE

Exploitability Score

6.5

Impact Score

6.9

Weaknesses

Type: Primary
NVD-CWE-noinfo

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Operating System	cypress	wireless_internet_connectivity_for_embedded_devices	≤ 2.9.0	Yes
Hardware	cypress	cyw20735b1	-	No

References

https://dl.packetstormsecurity.net/papers/general/braktooth.pdf Technical Description, Third Party Advisory ([email protected])
https://www.cypress.com/documentation/datasheets/cyw20735b1-single-chip-bluetooth-transceiver-wireless-input-devices Vendor Advisory ([email protected])
https://dl.packetstormsecurity.net/papers/general/braktooth.pdf Technical Description, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.cypress.com/documentation/datasheets/cyw20735b1-single-chip-bluetooth-transceiver-wireless-input-devices Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)