USN-5155-1: BlueZ vulnerabilities

Releases

• Ubuntu 21.10
• Ubuntu 21.04
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM

Packages

• 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

• libbluetooth3 - 5.60-0ubuntu2.1
• bluez - 5.60-0ubuntu2.1

Ubuntu 21.04

• libbluetooth3 - 5.56-0ubuntu4.3
• bluez - 5.56-0ubuntu4.3

Ubuntu 20.04

• libbluetooth3 - 5.53-0ubuntu3.4
• bluez - 5.53-0ubuntu3.4

Ubuntu 18.04

• libbluetooth3 - 5.48-0ubuntu3.6
• bluez - 5.48-0ubuntu3.6

In general, a standard system update will make all the necessary changes.

References

• CVE-2021-3658
• CVE-2021-41229
• CVE-2021-43400