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CVE-2023-45866

Publication date 6 December 2023

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

6.3 · Medium

Score breakdown

Bluetooth HID Hosts in BlueZ may permit an unauthenticated Peripheral role HID Device to initiate and establish an encrypted connection, and accept HID keyboard reports, potentially permitting injection of HID messages when no user interaction has occurred in the Central role to authorize such access. An example affected package is bluez 5.64-0ubuntu1 in Ubuntu 22.04LTS. NOTE: in some cases, a CVE-2020-0556 mitigation would have already addressed this Bluetooth HID Hosts issue.

From the Ubuntu Security Team

It was discovered that BlueZ did not properly restrict non-bonded devices from injecting HID events into the input subsystem. This could allow a physically proximate attacker to inject keystrokes and execute arbitrary commands whilst the device is discoverable.

Read the notes from the security team

Mitigation

In `/etc/bluetooth/input.conf` set `ClassicBondedOnly=true` and then `systemctl restart bluetooth`. Setting `ClassicBondedOnly=false` will re-enable legacy device support (like the PS3 controller) and the vulnerability.

Status

Package Ubuntu Release Status
bluez 24.04 LTS noble
Fixed 5.70-0ubuntu3
23.10 mantic
Fixed 5.68-0ubuntu1.1
23.04 lunar
Fixed 5.66-0ubuntu1.1
22.04 LTS jammy
Fixed 5.64-0ubuntu1.1
20.04 LTS focal
Fixed 5.53-0ubuntu3.7
18.04 LTS bionic
16.04 LTS xenial
14.04 LTS trusty Ignored end of standard support

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Notes

eslerm

underlying issue was addressed in CVE-2020-0556, but was not enabled and not compliant with Security Mode 4

eslerm

patch released ahead of public CRD

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
bluez

Severity score breakdown

Parameter Value
Base score 6.3 · Medium
Attack vector Adjacent
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality Low
Integrity impact Low
Availability impact Low
Vector CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

References

Related Ubuntu Security Notices (USN)

Other references