CVE-2019-15809 Information

Description

Smart cards from the Athena SCS manufacturer based on the Atmel Toolbox 00.03.11.05 and the AT90SC chip contain a timing side channel in ECDSA signature generation. This allows a local attacker able to measure the duration of hundreds to thousands of signing operations to compute the private key used. The issue occurs because the Atmel Toolbox 00.03.11.05 contains two versions of ECDSA signature functions described as fast and secure but the affected cards chose to use the fast version which leaks the bit length of the random nonce via timing. This affects Athena IDProtect 010b.0352.0005 Athena IDProtect 010e.1245.0002 Athena IDProtect 0106.0130.0401 Athena IDProtect 010e.1245.0002 Valid S/A IDflex V 010b.0352.0005 SafeNet eToken 4300 010e.1245.0002 TecSec Armored Card 010e.0264.0001 and TecSec Armored Card 108.0264.0001.

CVSS Vector

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

Reference

http://www.openwall.com/lists/oss-security/2019/10/02/2 https://csrc.nist.gov/Projects/Cryptographic-Algorithm-Validation-Program/details?source=ECDSA&number=214 https://eprint.iacr.org/2011/232.pdf https://minerva.crocs.fi.muni.cz/ https://tches.iacr.org/index.php/TCHES/article/view/7337 https://www.ssi.gouv.fr/certification_cc/bibliotheque-cryptographique-atmel-toolbox-00-03-11-05/

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

4.7