Ubuntu Security Notice 4989-2 - USN-4989-1 fixed several vulnerabilities in BlueZ. This update provides the corresponding update for Ubuntu 16.04 ESM. It was discovered that BlueZ incorrectly checked certain permissions when pairing. A local attacker could possibly use this issue to impersonate devices. Various other issues were also addressed.
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Ubuntu Security Notice USN-4989-2
June 16, 2021
bluez vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 16.04 ESM
Summary:
Several security issues were fixed in BlueZ.
Software Description:
- bluez: Bluetooth tools and daemons
Details:
USN-4989-1 fixed several vulnerabilities in BlueZ. This update provides
the corresponding update for Ubuntu 16.04 ESM.
Original advisory 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)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 16.04 ESM:
bluez 5.37-0ubuntu5.3+esm1
libbluetooth3 5.37-0ubuntu5.3+esm1
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-4989-2
https://ubuntu.com/security/notices/USN-4989-1
CVE-2020-26558, CVE-2020-27153