A BlueZ security update has been released for Ubuntu Linux 18.04 LTS, 20.04 LTS, 21.04, and 21.10.
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Ubuntu Security Notice USN-5155-1
November 23, 2021
bluez vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 21.10
- Ubuntu 21.04
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
Summary:
Several security issues were fixed in BlueZ.
Software Description:
- bluez: Bluetooth tools and daemons
Details:
It was discovered that BlueZ incorrectly handled the Discoverable status
when a device is powered down. This could result in devices being powered
up discoverable, contrary to expectations. This issue only affected Ubuntu
20.04 LTS, Ubuntu 21.04, and Ubuntu 21.10. (CVE-2021-3658)
It was discovered that BlueZ incorrectly handled certain memory operations.
A remote attacker could possibly use this issue to cause BlueZ to consume
resources, leading to a denial of service. (CVE-2021-41229)
It was discovered that the BlueZ gatt server incorrectly handled
disconnects. A remote attacker could possibly use this issue to cause
BlueZ to crash, leading to a denial of service. (CVE-2021-43400)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 21.10:
bluez 5.60-0ubuntu2.1
libbluetooth3 5.60-0ubuntu2.1
Ubuntu 21.04:
bluez 5.56-0ubuntu4.3
libbluetooth3 5.56-0ubuntu4.3
Ubuntu 20.04 LTS:
bluez 5.53-0ubuntu3.4
libbluetooth3 5.53-0ubuntu3.4
Ubuntu 18.04 LTS:
bluez 5.48-0ubuntu3.6
libbluetooth3 5.48-0ubuntu3.6
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-5155-1
CVE-2021-3658, CVE-2021-41229, CVE-2021-43400
Package Information:
https://launchpad.net/ubuntu/+source/bluez/5.60-0ubuntu2.1
https://launchpad.net/ubuntu/+source/bluez/5.56-0ubuntu4.3
https://launchpad.net/ubuntu/+source/bluez/5.53-0ubuntu3.4
https://launchpad.net/ubuntu/+source/bluez/5.48-0ubuntu3.6
