CVE-2020-12351: Input Validation

Published Oct 8, 2020
·
Updated

A flaw was found in the way the Linux kernel Bluetooth implementation handled L2CAP packets with A2MP CID. A remote attacker in adjacent range could use this flaw to crash the system causing denial of service or potentially execute arbitrary code on the system by sending a specially crafted L2CAP packet.

Other sources

A flaw was found in the way the Linux kernel’s Bluetooth implementation handled L2CAP (Logical Link Control and Adaptation Protocol) packets with A2MP (Alternate MAC-PHY Manager Protocol) CID (Channel Identifier). This flaw allows a remote attacker in an adjacent range to crash the system, causing a denial of service or potentially executing arbitrary code on the system by sending a specially crafted L2CAP packet. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

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

Affected Software

26 affected componentsFixes available
redhat/kernel-rt<0:3.10.0-1160.2.2.rt56.1134.el7
0:3.10.0-1160.2.2.rt56.1134.el7
redhat/kernel<0:3.10.0-1160.2.2.el7
0:3.10.0-1160.2.2.el7
redhat/kernel-alt<0:4.14.0-115.32.1.el7a
0:4.14.0-115.32.1.el7a
redhat/kernel<0:3.10.0-693.77.1.el7
0:3.10.0-693.77.1.el7
redhat/kernel<0:3.10.0-957.61.2.el7
0:3.10.0-957.61.2.el7
redhat/kernel<0:3.10.0-1062.37.1.el7
0:3.10.0-1062.37.1.el7
redhat/kernel-rt<0:4.18.0-193.28.1.rt13.77.el8_2
0:4.18.0-193.28.1.rt13.77.el8_2
redhat/kernel<0:4.18.0-193.28.1.el8_2
0:4.18.0-193.28.1.el8_2
redhat/kernel<0:4.18.0-80.30.1.el8_0
0:4.18.0-80.30.1.el8_0
redhat/kernel<0:4.18.0-147.32.1.el8_1
0:4.18.0-147.32.1.el8_1
Linux Linux kernel=5.8
Linux Linux kernel=5.9
Linux Linux kernel>=4.7.7<4.9.240
Linux Linux kernel>=4.10<4.14.202
Linux Linux kernel>=4.15<4.19.152
Linux Linux kernel>=4.20<5.4.72
Linux Linux kernel>=5.5<5.8.16
Linux Linux kernel=5.9.0
Linux Linux kernel=5.9.0-rc1
Linux Linux kernel=5.9.0-rc2
Linux Linux kernel=5.9.0-rc3
Linux Linux kernel=5.9.0-rc4
Linux Linux kernel=5.9.0-rc5
Linux Linux kernel=5.9.0-rc6
Linux Linux kernel=5.9.1
debian/linux
5.10.223-15.10.234-16.1.129-16.1.135-16.12.25-16.12.27-1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade redhat/kernel-rt to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-1160.2.2.rt56.1134.el7
  2. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-1160.2.2.el7
  3. Upgrade

    Upgrade redhat/kernel-alt to a version that resolves this vulnerability.

    Fixed in 0:4.14.0-115.32.1.el7a
  4. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-693.77.1.el7
  5. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-957.61.2.el7
  6. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-1062.37.1.el7
  7. Upgrade

    Upgrade redhat/kernel-rt to a version that resolves this vulnerability.

    Fixed in 0:4.18.0-193.28.1.rt13.77.el8_2
  8. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:4.18.0-193.28.1.el8_2
  9. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:4.18.0-80.30.1.el8_0
  10. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:4.18.0-147.32.1.el8_1
  11. Upgrade

    Upgrade debian/linux to a version that resolves this vulnerability.

    Fixed in 5.10.223-1Fixed in 5.10.234-1Fixed in 6.1.129-1Fixed in 6.1.135-1Fixed in 6.12.25-1Fixed in 6.12.27-1
  12. Configuration

    Disable Bluetooth functionality by preventing the Bluetooth kernel modules from loading using system-wide modprobe rules; alternatively, disable Bluetooth at the hardware or BIOS level.

    Linux kernel Bluetooth system-wide modprobe rules / kernel module blocklist = Bluetooth modules disabled or blocklisted

Event History

Oct 8, 2020
Data Sourced
via Red Hat·04:32 PM
DescriptionSeverityAffected Software
Oct 14, 2020
CVE Published
12:00 AM
News Published
via ZDNet·11:07 AM
Nov 23, 2020
CVE Published
via MITRE·04:15 PM
Data Sourced
via MITRE·04:15 PM
DescriptionWeakness
Jan 11, 2024
Data Sourced
via Launchpad·11:37 PM
Description
Jan 20, 2024
News Published
via ZDNet·05:13 AM
Apr 28, 2025
Data Sourced
via Ubuntu·04:20 AM
RemedyDescriptionSeverityAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

1

What is the vulnerability ID for this vulnerability?

The vulnerability ID for this vulnerability is CVE-2020-12351.

2

What is the severity of CVE-2020-12351?

The severity of CVE-2020-12351 is high with a CVSS score of 8.8.

3

What is the impact of CVE-2020-12351?

CVE-2020-12351 allows a remote attacker to crash the system, potentially causing a denial of service.

4

How can I fix CVE-2020-12351?

To fix CVE-2020-12351, update the affected software to the recommended versions.

5

Where can I find more information about CVE-2020-12351?

You can find more information about CVE-2020-12351 on the Red Hat Bugzilla and Red Hat Security Advisories websites.

Company

Resources

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