========================================================================== 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: 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