[USN-5155-1] BlueZ vulnerabilities

========================================================================== Ubuntu Security Notice USN-5155-1 November 23, 2021
bluez vulnerabilities ==========================================================================
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: ubuntu.com/security/notices/USN-5155-1 CVE-2021-3658, CVE-2021-41229, CVE-2021-43400
Package Information: launchpad.net/ubuntu/+source/bluez/5.60-0ubuntu2.1 launchpad.net/ubuntu/+source/bluez/5.56-0ubuntu4.3 launchpad.net/ubuntu/+source/bluez/5.53-0ubuntu3.4 launchpad.net/ubuntu/+source/bluez/5.48-0ubuntu3.6