Yubico YubiKey/YubiHSM ECDSA Secret Key timing discrepancy

CVSS Meta Temp Score
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CTI Interest Score
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3.0$0-$5k0.00

Summaryinfo

A vulnerability was found in Yubico YubiKey and YubiHSM. It has been rated as problematic. This issue affects some unknown processing of the component ECDSA Secret Key Handler. Performing a manipulation results in timing discrepancy. This vulnerability was named CVE-2024-45678. The attack may be carried out on the physical device. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Yubico YubiKey and YubiHSM (version unknown). It has been classified as problematic. This affects an unknown function of the component ECDSA Secret Key Handler. The manipulation with an unknown input leads to a timing discrepancy vulnerability. CWE is classifying the issue as CWE-208. Two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not. This is going to have an impact on confidentiality. The summary by CVE is:

Yubico YubiKey 5 Series devices with firmware before 5.7.0 and YubiHSM 2 devices with firmware before 2.4.0 allow an 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. Other uses of an Infineon cryptographic library may also be affected.

It is possible to read the advisory at yubico.com. This vulnerability is uniquely identified as CVE-2024-45678 since 09/03/2024. The exploitability is told to be difficult. Attacking locally is a requirement. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2024-41550). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

Name

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.1
VulDB Meta Temp Score: 3.0

VulDB Base Score: 2.0
VulDB Temp Score: 1.9
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 4.2
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Timing discrepancy
CWE: CWE-208 / CWE-203 / CWE-200
CAPEC: 🔍
ATT&CK: 🔍

Physical: Yes
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

09/03/2024 🔍
09/03/2024 +0 days 🔍
09/03/2024 +0 days 🔍
06/15/2025 +285 days 🔍

Sourcesinfo

Advisory: yubico.com
Status: Confirmed

CVE: CVE-2024-45678 (🔍)
GCVE (CVE): GCVE-0-2024-45678
GCVE (VulDB): GCVE-100-276423
EUVD: 🔍

Entryinfo

Created: 09/03/2024 22:03
Updated: 06/15/2025 18:28
Changes: 09/03/2024 22:03 (53), 09/05/2024 05:47 (1), 09/13/2024 09:47 (11), 06/15/2025 18:28 (1)
Complete: 🔍
Cache ID: 216::103

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