Vulnerability in Athena-Scs Idprotect
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 · last modified .
CVSS v3 metric
CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.005 (38.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 38.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Athena-Scs Idprotect — versions 010b.0352.0005, 010e.1245.0002, 0106.0130.0401
- Cryptsoft S\/a Idflex V — versions 010b.0352.0005
- Microchip Atmel Toolbox — versions 00.03.11.05
- Tecsec Armored Card — versions 010e.0264.0001, 108.0264.0001
- Thalesgroup Etoken 4300 — versions 010e.1245.0002
Weakness classification (CWE)
References
- eprint.iacr.org/2011/232.pdf (Technical Description, Third Party Advisory)
- tches.iacr.org/index.php/TCHES/article/view/7337 (Technical Description, Third Party Advisory)
- www.ssi.gouv.fr/certification_cc/bibliotheque-cryptographique-atmel-toolbox-00-… (Product)
- csrc.nist.gov/Projects/Cryptographic-Algorithm-Validation-Program/details (US Government Resource, Third Party Advisory)
- www.openwall.com/lists/oss-security/2019/10/02/2 (mailing-list, Mailing List, Third Party Advisory)
- minerva.crocs.fi.muni.cz/ (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2019-15809?
- CVE-2019-15809 is a medium-severity vulnerability in Athena-Scs Idprotect, classified under Observable Discrepancy. CVSS score: 4.7/10. Published 2019-10-03.
- How severe is CVE-2019-15809?
- Medium severity. CVSS v3 base score is 4.7 out of 10.