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Minerva timing attack on P-256 in python-ecdsa

High severity GitHub Reviewed Published Jan 22, 2024 in tlsfuzzer/python-ecdsa • Updated Jan 23, 2024

Package

pip ecdsa (pip)

Affected versions

<= 0.18.0

Patched versions

None

Description

python-ecdsa has been found to be subject to a Minerva timing attack on the P-256 curve. Using the ecdsa.SigningKey.sign_digest() API function and timing signatures an attacker can leak the internal nonce which may allow for private key discovery. Both ECDSA signatures, key generation, and ECDH operations are affected. ECDSA signature verification is unaffected. The python-ecdsa project considers side channel attacks out of scope for the project and there is no planned fix.

References

@tomato42 tomato42 published to tlsfuzzer/python-ecdsa Jan 22, 2024
Published to the GitHub Advisory Database Jan 22, 2024
Reviewed Jan 22, 2024
Published by the National Vulnerability Database Jan 23, 2024
Last updated Jan 23, 2024

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS score

0.076%
(35th percentile)

Weaknesses

CVE ID

CVE-2024-23342

GHSA ID

GHSA-wj6h-64fc-37mp

Source code

Credits

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