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
Published Oct 3, 2019
4.7
MEDIUMCVSS 3.1
EPSS 0.47%
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.
Affected products
No data.
Configuration 1
- 00.03.11.05
Configuration 2
- 010b.0352.0005
- 010e.1245.0002
- 0106.0130.0401
- 010b.0352.0005
- 010e.0264.0001
- 108.0264.0001
- 010e.1245.0002
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
No CVSS v3.0 score for this CVE.
AV:L/AC:H/Au:N/C:P/I:N/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Table of values (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.47% (0.00471) | 38.48th | v5 (v2026.06.15) |
| Sep 20, 2026 | 0.47% (0.00471) | 39.94th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.04% (0.00043) | 5.22th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.04% (0.00043) | 5.88th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.03% (0.01034) | 41.69th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.01% (0.02008) | 56.41th | v2 (v2022.01.01) |
| Feb 3, 2022 | 3.39% (0.03394) | 66.86th | v1 |
| Jan 6, 2022 | 3.39% (0.03394) | 66.54th | v1 |
| Jan 5, 2022 | 0.78% (0.00777) | 51.32th | v5 (v2026.06.15) |
| Apr 14, 2021 | 0.78% (0.00777) | 0.00th | v1 |
References (6)
- http://www.openwall.com/lists/oss-security/2019/10/02/2 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- https://csrc.nist.gov/Projects/Cryptographic-Algorithm-Validation-Program/details?source=ECDSA&number=214 x_refsource_MISCThird Party AdvisoryUS Government Resource
- https://eprint.iacr.org/2011/232.pdf x_refsource_MISCTechnical DescriptionThird Party Advisory
- https://minerva.crocs.fi.muni.cz/ x_refsource_MISCExploitThird Party Advisory
- https://tches.iacr.org/index.php/TCHES/article/view/7337 x_refsource_MISCTechnical DescriptionThird Party Advisory
- https://www.ssi.gouv.fr/certification_cc/bibliotheque-cryptographique-atmel-toolbox-00-03-11-05/ x_refsource_MISCProduct
| Link | Providers | Tags |
|---|---|---|
| http://www.openwall.com/lists/oss-security/2019/10/02/2 | mailing-listx_refsource_MLISTMailing ListThird Party Advisory | |
| https://csrc.nist.gov/Projects/Cryptographic-Algorithm-Validation-Program/details?source=ECDSA&number=214 | x_refsource_MISCThird Party AdvisoryUS Government Resource | |
| https://eprint.iacr.org/2011/232.pdf | x_refsource_MISCTechnical DescriptionThird Party Advisory | |
| https://minerva.crocs.fi.muni.cz/ | x_refsource_MISCExploitThird Party Advisory | |
| https://tches.iacr.org/index.php/TCHES/article/view/7337 | x_refsource_MISCTechnical DescriptionThird Party Advisory | |
| https://www.ssi.gouv.fr/certification_cc/bibliotheque-cryptographique-atmel-toolbox-00-03-11-05/ | x_refsource_MISCProduct |
Change history (0)
No recorded changes yet.