Arbitrary code execution in BlueZ

1) Use-after-free

EUVDB-ID: #VU83407

Risk: Medium

CVSSv3.1: 5.3 [CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-43400

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows an attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in gatt-database.c on a gatt server if a client disconnects while a WriteValue call is being processed with D-Bus. An attacker with physical proximity to the system can trigger a use-after-free error and potentially execute arbitrary code.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

BlueZ: 4.0 - 5.61

External links

http://git.kernel.org/pub/scm/bluetooth/bluez.git/commit/?id=838c0dc7641e1c991c0f3027bf94bee4606012f8
http://lists.debian.org/debian-lts-announce/2022/10/msg00026.html

Q & A

Can this vulnerability be exploited remotely?

No. The attacker should have physical access to the system in order to successfully exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.