The Bluetooth Classic implementation in the Cypress WICED BT stack through 2.9.0 for CYW20735B1 devices does not properly handle the reception of LMP_max_slot with an invalid Baseband packet type (and LT_ADDRESS and LT_ADDR) after completion of the LMP setup procedure, allowing attackers in radio range to trigger a denial of service (firmware crash) via a crafted LMP packet.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Wireless_internet_connectivity_for_embedded_devices | Cypress | * | 2.9.0 (including) |
| Bluez-firmware | Ubuntu | esm-apps/jammy | * |
| Bluez-firmware | Ubuntu | jammy | * |
| Bluez-firmware | Ubuntu | kinetic | * |
| Bluez-firmware | Ubuntu | lunar | * |
| Bluez-firmware | Ubuntu | mantic | * |
| Bluez-firmware | Ubuntu | trusty | * |
| Bluez-firmware | Ubuntu | upstream | * |
| Bluez-firmware | Ubuntu | xenial | * |
References
- https://dl.packetstormsecurity.net/papers/general/braktooth.pdf
- https://www.cypress.com/documentation/datasheets/cyw20735b1-single-chip-bluetooth-transceiver-wireless-input-devices
- https://dl.packetstormsecurity.net/papers/general/braktooth.pdf
- https://www.cypress.com/documentation/datasheets/cyw20735b1-single-chip-bluetooth-transceiver-wireless-input-devices