A BlueZ security update has been released for Ubuntu Linux 18.04 LTS, 20.04 LTS, 20.10, and 21.04.
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Ubuntu Security Notice USN-4989-1
June 16, 2021
bluez vulnerabilities
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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
