ESB-2020.3518.2 – UPDATE [Linux] BlueZ: Multiple vulnerabilities

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             AUSCERT External Security Bulletin Redistribution

                              ESB-2020.3518.2
                       INTEL-SA-00435 BlueZ Advisory
                              16 October 2020

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           BlueZ
Publisher:         Intel
Operating System:  Linux variants
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Denial of Service               -- Remote/Unauthenticated
                   Access Confidential Data        -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-24490 CVE-2020-12352 CVE-2020-12351

Original Bulletin: 
   https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00435.html

Revision History:  October 16 2020: Vendor updated advisory to remove reference to Linux kernel version
                   October 14 2020: Initial Release

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Intel ID:                         INTEL-SA-00435
Advisory Category:        Software
Impact of vulnerability : Escalation of Privilege, Information Disclosure
Severity rating :         HIGH
Original release:         10/13/2020
Last revised:             10/15/2020

Summary:

Potential security vulnerabilities in BlueZ may allow escalation of privilege
or information disclosure. BlueZ is releasing Linux kernel fixes to address
these potential vulnerabilities.

Vulnerability Details:

CVEID: CVE-2020-12351

Description: Improper input validation in BlueZ may allow an unauthenticated
user to potentially enable escalation of privilege via adjacent access.

CVSS Base Score: 8.3 High

CVSS Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

CVEID: CVE-2020-12352

Description: Improper access control in BlueZ may allow an unauthenticated user
to potentially enable information disclosure via adjacent access.

CVSS Base Score: 5.3 Medium

CVSS Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

CVEID: CVE-2020-24490

Description: Improper buffer restrictions in BlueZ may allow an unauthenticated
user to potentially enable denial of service via adjacent access.

CVSS Base Score: 5.3 Medium

CVSS Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Products:

All Linux kernel versions that support BlueZ.

Recommendations:

Intel recommends installing the following kernel fixes to address these issues:

https://lore.kernel.org/linux-bluetooth/
20200806181714.3216076-1-luiz.dentz@gmail.com/

https://lore.kernel.org/linux-bluetooth/
20200806181714.3216076-2-luiz.dentz@gmail.com/

https://lore.kernel.org/linux-bluetooth/
20200806181714.3216076-3-luiz.dentz@gmail.com/

https://lore.kernel.org/linux-bluetooth/
20200806181714.3216076-4-luiz.dentz@gmail.com/

https://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next.git/
commit/?id=a2ec905d1e160a33b2e210e45ad30445ef26ce0e

Acknowledgements:

Intel would like to thank Andy Nguyen, security engineer from Google for
reporting these issues.

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      10/13/2020 Initial Release
1.1      10/15/2020 Removed reference to Linux kernel version

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This security bulletin is provided as a service to AusCERT's members.  As
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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
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