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AUSCERT External Security Bulletin Redistribution
9 June 2021
AusCERT Security Bulletin Summary
Operating System: Linux variants
Impact/Access: Access Confidential Data -- Existing Account
Reduced Security -- Remote/Unauthenticated
CVE Names: CVE-2021-0129 CVE-2020-26558
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Intel ID: INTEL-SA-00517
Advisory Category: Software
Impact of vulnerability : Information Disclosure
Severity rating : MEDIUM
Original release: 06/08/2021
Last revised: 06/08/2021
Potential security vulnerabilities in BlueZ may allow information disclosure.
BlueZ is releasing Linux kernel Bluetooth subsystem updates to mitigate these
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
All Linux kernel versions prior to 5.13 that support BlueZ.
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/
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.
Revision Date Description
1.0 06/08/2021 Initial Release
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