Intel Security CenterINTEL:INTEL-SA-00517BlueZ Advisory
Summary:
Potential security vulnerabilities in BlueZ may allow information disclosure. BlueZ is releasing Linux kernel Bluetooth subsystem updates to mitigate these potential vulnerabilities.
Vulnerability Details:
CVEID: CVE-2021-0129
Description: Improper access control in BlueZ may allow an authenticated user to potentially enable information disclosure via adjacent access.
CVSS Base Score: 6.4 Medium
CVSS Vector: CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
CVEID: CVE-2020-26558 (Non-Intel issued)
Description: Bluetooth LE and BR/EDR secure pairing in Bluetooth Core Specification 2.1 through 5.2 may permit a nearby man-in-the-middle attacker to identify the Passkey used during pairing (in the Passkey authentication procedure) by reflection of the public key and the authentication evidence of the initiating device, potentially permitting this attacker to complete authenticated pairing with the responding device using the correct Passkey for the pairing session. The attack methodology determines the Passkey value one bit at a time.
CVSS Base Score: 4.2 Medium
CVSS Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Affected Products:
All Linux kernel versions prior to 5.13 that support BlueZ.
Recommendations:
Intel recommends installing the following kernel fix and BlueZ update to address these issues:
Or use the following BlueZ releases which already incorporate the fixes:
· kernel: 5.13
· userspace: <http://www.bluez.org/release-of-bluez-5-58-and-5-57/>
Acknowledgements:
Intel would like to thank Agence Nationale de Securite des Systemes d’Information (ANSSI) for reporting CVE-2021-0129.
Intel, and nearly the entire technology industry, follows a disclosure practice called Coordinated Disclosure, under which a cybersecurity vulnerability is generally publicly disclosed only after mitigations are available.
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