OpenSSL FIPS 3.03.4 ECDSA Timing Leak (NIST P521)
CVE-2024-13176 Published on January 20, 2025
Timing side-channel in ECDSA signature computation
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.
The FIPS modules in 3.4, 3.3, 3.2, 3.1 and 3.0 are affected by this issue.
Vulnerability Analysis
CVE-2024-13176 is exploitable with physical access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be low. considered to have a small impact on confidentiality and integrity and availability.
Weakness Type
Covert Timing Channel
Covert timing channels convey information by modulating some aspect of system behavior over time, so that the program receiving the information can observe system behavior and infer protected information.
Products Associated with CVE-2024-13176
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Affected Versions
OpenSSL:- Version 3.4.0 and below 3.4.1 is affected.
- Version 3.3.0 and below 3.3.3 is affected.
- Version 3.2.0 and below 3.2.4 is affected.
- Version 3.1.0 and below 3.1.8 is affected.
- Version 3.0.0 and below 3.0.16 is affected.
- Version 1.1.1 and below 1.1.1zb is affected.
- Version 1.0.2 and below 1.0.2zl is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.