Observable discrepancy in Yubico products - #VU96776
Published: September 4, 2024
Vulnerability identifier: #VU96776
CSH Severity: Low
CVSS v4: 4.1 [CVSS:4.0/AV:P/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-203
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an attacker to recover an ECDSA private key.
The vulnerability exists due to observable discrepancy within the Infineon’s cryptographic library used by the YubiKey 5 Series and Security Key Series firmware. An attacker with physical access to the token can perform a side-channel attack to recover the ECDSA private key and compromise the hardware token.
Affected software
YubiHSM
YubiKey 5 Series
Security Key Series
YubiKey Bio Series
YubiKey 5 Series
Security Key Series
YubiKey Bio Series
Remediation
Install updates from vendor's website.
YubiHSM - update to 2.4.0
YubiKey 5 Series - update to 5.7.0
Security Key Series - update to 5.7.0
YubiKey Bio Series - update to 5.7.2
YubiKey 5 Series - update to 5.7.0
Security Key Series - update to 5.7.0
YubiKey Bio Series - update to 5.7.2