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Ubuntu Security Notice USN-4989-1

Ubuntu Security Notice USN-4989-1
Posted Jun 17, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4989-1 - It was discovered that BlueZ incorrectly checked certain permissions when pairing. A local attacker could possibly use this issue to impersonate devices. 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. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, local
systems | linux, ubuntu
advisories | CVE-2020-26558, CVE-2020-27153, CVE-2021-3588
MD5 | 9bddaf7808213fef5017a3935246b0ca

Ubuntu Security Notice USN-4989-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-4989-1
June 16, 2021

bluez vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 21.04
- Ubuntu 20.10
- 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 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)

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.

References:
https://ubuntu.com/security/notices/USN-4989-1
CVE-2020-26558, CVE-2020-27153, CVE-2021-3588

Package Information:
https://launchpad.net/ubuntu/+source/bluez/5.56-0ubuntu4.1
https://launchpad.net/ubuntu/+source/bluez/5.55-0ubuntu1.2
https://launchpad.net/ubuntu/+source/bluez/5.53-0ubuntu3.2
https://launchpad.net/ubuntu/+source/bluez/5.48-0ubuntu3.5

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