Vulnerability Monitor

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CVE-2019-15809

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.

Published

2019-10-03T14:15:11.320

Last Modified

2024-11-21T04:29:30.693

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 4.7 (MEDIUM)

CVSSv2 Vector

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

Access Vector: LOCAL
Access Complexity: HIGH
Authentication: NONE
Confidentiality Impact: PARTIAL
Integrity Impact: NONE
Availability Impact: NONE

Exploitability Score

1.9

Impact Score

2.9

Weaknesses

Type: Primary
CWE-203

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	microchip	atmel_toolbox	00.03.11.05	Yes
Operating System	athena-scs	idprotect	010b.0352.0005	Yes
Operating System	athena-scs	idprotect	010e.1245.0002	Yes
Operating System	athena-scs	idprotect	0106.0130.0401	Yes
Operating System	cryptsoft	s\/a_idflex_v	010b.0352.0005	Yes
Operating System	tecsec	armored_card	010e.0264.0001	Yes
Operating System	tecsec	armored_card	108.0264.0001	Yes
Operating System	thalesgroup	etoken_4300	010e.1245.0002	Yes

References

http://www.openwall.com/lists/oss-security/2019/10/02/2 Mailing List, Third Party Advisory ([email protected])
https://csrc.nist.gov/Projects/Cryptographic-Algorithm-Validation-Program/details?source=ECDSA&number=214 Third Party Advisory, US Government Resource ([email protected])
https://eprint.iacr.org/2011/232.pdf Technical Description, Third Party Advisory ([email protected])
https://minerva.crocs.fi.muni.cz/ Exploit, Third Party Advisory ([email protected])
https://tches.iacr.org/index.php/TCHES/article/view/7337 Technical Description, Third Party Advisory ([email protected])
https://www.ssi.gouv.fr/certification_cc/bibliotheque-cryptographique-atmel-toolbox-00-03-11-05/ Product ([email protected])
http://www.openwall.com/lists/oss-security/2019/10/02/2 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://csrc.nist.gov/Projects/Cryptographic-Algorithm-Validation-Program/details?source=ECDSA&number=214 Third Party Advisory, US Government Resource (af854a3a-2127-422b-91ae-364da2661108)
https://eprint.iacr.org/2011/232.pdf Technical Description, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://minerva.crocs.fi.muni.cz/ Exploit, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://tches.iacr.org/index.php/TCHES/article/view/7337 Technical Description, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.ssi.gouv.fr/certification_cc/bibliotheque-cryptographique-atmel-toolbox-00-03-11-05/ Product (af854a3a-2127-422b-91ae-364da2661108)