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             AUSCERT External Security Bulletin Redistribution

                     USN-5155-1: BlueZ vulnerabilities
                             24 November 2021


        AusCERT Security Bulletin Summary

Product:           BlueZ
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Denial of Service -- Remote/Unauthenticated      
                   Reduced Security  -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-43400 CVE-2021-41229 CVE-2021-3658

Original Bulletin: 

Comment: This advisory references vulnerabilities in products which run on 
         platforms other than Ubuntu. It is recommended that administrators 
         running BlueZ check for an updated version of the software for their
         operating system.

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USN-5155-1: BlueZ vulnerabilities
23 November 2021

Several security issues were fixed in BlueZ.

  o Ubuntu 21.10
  o Ubuntu 21.04
  o Ubuntu 20.04 LTS
  o Ubuntu 18.04 LTS


  o bluez - Bluetooth tools and daemons


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

Ubuntu 21.10

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

Ubuntu 21.04

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

Ubuntu 20.04

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

Ubuntu 18.04

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

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


  o CVE-2021-3658
  o CVE-2021-41229
  o CVE-2021-43400

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