CVE-2021-33881 Information

Description

On NXP MIFARE Ultralight and NTAG cards an attacker can interrupt a write operation (aka conduct a ear off\ attack) over RFID to bypass a Monotonic Counter protection mechanism. The impact depends on how the anti tear-off feature is used in specific applications such as public transportation physical access control etc.

CVSS Vector

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

Reference

https://www.nxp.com/docs/en/application-note/AN13089.pdf https://www.sstic.org/2021/presentation/eeprom_it_will_all_end_in_tears/ https://www.nxp.com/docs/en/application-note/AN11340.pdf https://blog.quarkslab.com/rfid-monotonic-counter-anti-tearing-defeated.html

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

HIGH

Base Score

NONE

Base Severity

4.2