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CVE-2024-13176

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Date: January 20, 2025

Issue summary: A timing side-channel which could potentially allow recovering the private key exists in the ECDSA signature computation. Impact summary: A timing side-channel in ECDSA signature computations could allow recovering the private key by an attacker. However, measuring the timing would require either local access to the signing application or a very fast network connection with low latency. There is a timing signal of around 300 nanoseconds when the top word of the inverted ECDSA nonce value is zero. This can happen with significant probability only for some of the supported elliptic curves. In particular the NIST P-521 curve is affected. To be able to measure this leak, the attacker process must either be located in the same physical computer or must have a very fast network connection with low latency. For that reason the severity of this vulnerability is Low.

Severity Score

Severity Score

Weakness Type (CWE)

Covert Timing Channel

CWE-385

Top Fix

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Upgrade Version

Upgrade to version https://github.com/openssl/openssl.git - openssl-3.0.16;https://github.com/openssl/openssl.git - openssl-3.1.8;https://github.com/openssl/openssl.git - openssl-3.2.4;https://github.com/openssl/openssl.git - openssl-3.3.3;https://github.com/openssl/openssl.git - openssl-3.4.1

Learn More

CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): HIGH
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): LOW
Integrity (I): NONE
Availability (A): NONE

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