CVE-2019-15809
What it is
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.
At a glance
- Exploitability
- Can be exploited locally on the machine with a low-privilege account. High risk of data exposure.
- Exploit odds
- 0.5% chance of exploitation in the next 30 days (EPSS).
- Fix
- No patch or advisory is linked yet. Look at mitigations or restrict exposure.
Timeline
- PublishedDisclosed publicly on CVE.org and NVD
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: no, CISA does not list it.
- Exploit odds: 0.5% in the next 30 days (EPSS).
- Severity: 4.7 MEDIUM (CVSS).
- Fix: none linked yet, which raises it.
Details
- Published
- Last modified
- Exploit probability
- 0.5% · EPSS, next 30 days
- Weakness
- CWE-203
- Record status
- Modified
Affected
- Microchip Atmel Toolbox 00.03.11.05
- athena-scs Idprotect 010b.0352.0005
- athena-scs Idprotect 010e.1245.0002
- athena-scs Idprotect 0106.0130.0401
- Cryptsoft s\/a Idflex V 010b.0352.0005
- Tecsec Armored Card 010e.0264.0001
- Tecsec Armored Card 108.0264.0001
- Thalesgroup Etoken 4300 010e.1245.0002
Attack profile CVSS 3.1 · 4.7
- Attack vector
- Local
- Complexity
- High
- Privileges needed
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Raw vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2019-15809.md and follow it. Check whether this project is affected by CVE-2019-15809. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
References
- 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/
- 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/