Ubuntu 21.04 USN-4989-1 Critical: BlueZ Denial Of Service Issue

ubuntu

June 16, 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 checked certain permissions when

pairing. A local attacker could possibly use this issue to impersonate

devices. (CVE-2020-26558)

Jay LV discovered that BlueZ incorrectly handled redundant disconnect MGMT

events. A local attacker could use this issue to cause BlueZ to crash,

resulting in a denial of service, or possibly execute arbitrary code. This

issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2020-27153)

Ziming Zhang discovered that BlueZ incorrectly handled certain array

indexes. A local attacker could use this issue to cause BlueZ to crash,

resulting in a denial of service, or possibly obtain sensitive information.

This issue only affected Ubuntu 20.04 LTS and Ubuntu 20.10. (CVE-2021-3588)

Topics Covered

security advisory denial of service software update local attack ubuntu bluez

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 21.04:
  bluez                           5.56-0ubuntu4.1
  libbluetooth3                   5.56-0ubuntu4.1

Ubuntu 20.10:
  bluez                           5.55-0ubuntu1.2
  libbluetooth3                   5.55-0ubuntu1.2

Ubuntu 20.04 LTS:
  bluez                           5.53-0ubuntu3.2
  libbluetooth3                   5.53-0ubuntu3.2

Ubuntu 18.04 LTS:
  bluez                           5.48-0ubuntu3.5
  libbluetooth3                   5.48-0ubuntu3.5

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