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AUSCERT External Security Bulletin Redistribution
ESB-2021.1999
BlueZ Advisory
9 June 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: BlueZ
Publisher: Intel
Operating System: Linux variants
Impact/Access: Access Confidential Data -- Existing Account
Reduced Security -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-0129 CVE-2020-26558
Reference: ESB-2021.1976
Original Bulletin:
https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00517.html
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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
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:
https://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next.git/
commit/net/bluetooth/smp.c?id=6d19628f539fccf899298ff02ee4c73e4bf6df3f
https://git.kernel.org/pub/scm/bluetooth/bluez.git/commit/?id=
00da0fb4972cf59e1c075f313da81ea549cb8738
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.
Revision History
Revision Date Description
1.0 06/08/2021 Initial Release
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