CVE-2020-26555

2021-05-2613:14:29

redhat.com

access.redhat.com

5.4 Medium

CVSS3

Attack Vector

ADJACENT_NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

LOW

Availability Impact

NONE

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

4.8 Medium

CVSS2

Access Vector

ADJACENT_NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:A/AC:L/Au:N/C:P/I:P/A:N

0.001 Low

EPSS

Percentile

24.4%

JSON

A vulnerability was found in Linux Kernel, where Bluetooth BR/EDR PIN Pairing procedure is vulnerable to an impersonation attack. When an attacker connects to a victim device using the address of the device and the victim initiates a Pairing, the attacker can reflect the encrypted nonce even without knowledge of the key.

Mitigation

It is recommended that devices not accept connections from or initiate connections to remote devices claiming the same Bluetooth device address as their own, also a controller computing a null (zero-valued) combination not accept this key as a valid and fail any pairing attempt that produced a null key.

It is also recommends that BR/EDR implementations enable Secure Simple Pairing, and where possible, implementations enable and enforce Secure Connections Only Mode, ensuring that pin-code pairing cannot be used.