Vulnerability 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 Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Microchip | Atmel Toolbox | 00.03.11.05 |
| Athena-Scs | Idprotect | 010b.0352.0005 |
| Cryptsoft | S\/A Idflex V | 010b.0352.0005 |
| Tecsec | Armored Card | 010e.0264.0001 |
| Thalesgroup | Etoken 4300 | 010e.1245.0002 |
Related Weaknesses (CWE)
References
- http://www.openwall.com/lists/oss-security/2019/10/02/2Mailing ListThird Party Advisory
- https://csrc.nist.gov/Projects/Cryptographic-Algorithm-Validation-Program/detailThird Party AdvisoryUS Government Resource
- https://eprint.iacr.org/2011/232.pdfTechnical DescriptionThird Party Advisory
- https://minerva.crocs.fi.muni.cz/ExploitThird Party Advisory
- https://tches.iacr.org/index.php/TCHES/article/view/7337Technical DescriptionThird Party Advisory
- https://www.ssi.gouv.fr/certification_cc/bibliotheque-cryptographique-atmel-toolProduct
- http://www.openwall.com/lists/oss-security/2019/10/02/2Mailing ListThird Party Advisory
- https://csrc.nist.gov/Projects/Cryptographic-Algorithm-Validation-Program/detailThird Party AdvisoryUS Government Resource
- https://eprint.iacr.org/2011/232.pdfTechnical DescriptionThird Party Advisory
- https://minerva.crocs.fi.muni.cz/ExploitThird Party Advisory
- https://tches.iacr.org/index.php/TCHES/article/view/7337Technical DescriptionThird Party Advisory
- https://www.ssi.gouv.fr/certification_cc/bibliotheque-cryptographique-atmel-toolProduct
FAQ
What is CVE-2019-15809?
CVE-2019-15809 is a vulnerability with a CVSS score of 4.7 (MEDIUM). 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, abl...
How severe is CVE-2019-15809?
CVE-2019-15809 has been rated MEDIUM with a CVSS base score of 4.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2019-15809?
Check the references section above for vendor advisories and patch information. Affected products include: Microchip Atmel Toolbox, Athena-Scs Idprotect, Cryptsoft S\/A Idflex V, Tecsec Armored Card, Thalesgroup Etoken 4300.