CVE-2019-15809 Information disclosure in n/a
A timing side-channel in ECDSA signature generation allows local attackers to recover private keys from affected smart cards.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2019-15809?
CVE-2019-15809 is a medium-severity vulnerability in n/a, published on 3 Oct 2019. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-203
Which versions are affected by CVE-2019-15809?
It affects 5 products.
Products include Athena-Scs Idprotect, Cryptsoft S\/a Idflex V, Microchip Atmel Toolbox, Tecsec Armored Card, Thalesgroup Etoken 4300.
How do I fix CVE-2019-15809?
No fix has been published for CVE-2019-15809 yet. Limit exposure of the affected software until one is available.
Is CVE-2019-15809 being exploited?
There is no known exploitation of CVE-2019-15809 in the wild and no public exploit code.
Sources
Also known as GHSA-c76g-76cj-g742.