Ubuntu 21.10: 5155-1 Critical BlueZ Denial Of Service Issues

ubuntu

November 23, 2021

Several security issues were fixed in BlueZ.

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)

Topics Covered

security advisory denial of service critical update instructions ubuntu bluez

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.