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 a greater ACL Length 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.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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 a greater ACL Length 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. (CVE-2021-34148)

Note that Nessus relies on the presence of the package as reported by the vendor.

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - 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. (CVE-2021-34145)

  - The Bluetooth Classic implementation in the Cypress CYW920735Q60EVB does not properly handle the reception
    of continuous unsolicited LMP responses, allowing attackers in radio range to trigger a denial of service
    and restart (crash) of the device by flooding it with LMP_AU_Rand packets after the paging procedure.
    (CVE-2021-34146)

  - 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. (CVE-2021-34147)

  - 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 a greater ACL Length 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. (CVE-2021-34148)

ID	Name	Product	Family	Severity
256981	Linux Distros Unpatched Vulnerability : CVE-2021-34148	Nessus	Misc.	medium
409770	Alpine: amd-ucode, multiple linux-firmware packages: security update to 20220815-r1 (deprecated)	Tenable Cloud Security	Alpine Linux Local Security Checks	medium
409770	Alpine: amd-ucode, multiple linux-firmware packages: security update to 20220815-r1 (deprecated)	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	medium

Detections

Analytics

CVE-2021-34148

medium

Tenable Plugins

medium

medium

medium