Observable discrepancy in YubiHSM and YubiKey 5 Series - CVE-2024-45678

Vulnerability details

The vulnerability allows an attacker with physical access to gain access to potentially sensitive information.

The vulnerability exists due to Yubico YubiKey 5 Series and YubiHSM 2 devices allows ECDSA secret-key extraction attack (that requires physical access and expensive equipment) in which an electromagnetic side channel is present because of a non-constant-time modular inversion for the Extended Euclidean Algorithm, aka the EUCLEAK issue. A attacker with physical access can gain unauthorized access to sensitive information on the system.

Affected software

How to mitigate CVE-2024-45678

External References

• https://www.yubico.com/support/security-advisories/ysa-2024-03/
• https://support.yubico.com/hc/en-us/articles/15705749884444
• https://ninjalab.io/eucleak/
• https://ninjalab.io/wp-content/uploads/2024/09/20240903_eucleak.pdf
• https://news.ycombinator.com/item?id=41434500
• https://arstechnica.com/security/2024/09/yubikeys-are-vulnerable-to-cloning-attacks-thanks-to-newly-discovered-side-channel/

Related Security Bulletins

• Observable discrepancy in Yubico YubiKey 5 Series devices and YubiHSM 2 devices
• IBM Security Verify Access Docker update for Yubico YubiKey 5 Series, Security Key Series and YubiHSM 2