USN-4989-1: BlueZ vulnerabilities

Releases

• Ubuntu 21.04
• Ubuntu 20.10
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM

Packages

• 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

• libbluetooth3 - 5.56-0ubuntu4.1
• bluez - 5.56-0ubuntu4.1

Ubuntu 20.10

• libbluetooth3 - 5.55-0ubuntu1.2
• bluez - 5.55-0ubuntu1.2

Ubuntu 20.04

• libbluetooth3 - 5.53-0ubuntu3.2
• bluez - 5.53-0ubuntu3.2

Ubuntu 18.04

• libbluetooth3 - 5.48-0ubuntu3.5
• bluez - 5.48-0ubuntu3.5

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

References

• CVE-2021-3588
• CVE-2020-26558
• CVE-2020-27153

Related notices

• USN-4989-2
• USN-5017-1
• USN-5018-1
• USN-5046-1
• USN-5050-1
• USN-5299-1
• USN-5343-1