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Python RSA allows attackers to spoof signatures

Moderate severity GitHub Reviewed Published May 14, 2022 to the GitHub Advisory Database • Updated Oct 21, 2024

Package

pip rsa (pip)

Affected versions

< 3.3

Patched versions

3.3

Description

The verify function in the RSA package for Python (Python-RSA) before 3.3 allows attackers to spoof signatures with a small public exponent via crafted signature padding, aka a BERserk attack.

References

Published by the National Vulnerability Database Jan 13, 2016
Published to the GitHub Advisory Database May 14, 2022
Reviewed Jul 28, 2023
Last updated Oct 21, 2024

Severity

Moderate

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
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
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:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

EPSS score

0.428%
(75th percentile)

Weaknesses

CVE ID

CVE-2016-1494

GHSA ID

GHSA-8rjr-6qq5-pj9p

Source code

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