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m2crypto Bleichenbacher timing attack - incomplete fix for CVE-2020-25657

Moderate severity GitHub Reviewed Published Feb 5, 2024 to the GitHub Advisory Database • Updated Feb 5, 2024

Package

pip m2crypto (pip)

Affected versions

<= 0.40.1

Patched versions

None

Description

A flaw was found in m2crypto. This issue may allow a remote attacker to decrypt captured messages in TLS servers that use RSA key exchanges, which may lead to exposure of confidential or sensitive data.

References

Published by the National Vulnerability Database Feb 5, 2024
Published to the GitHub Advisory Database Feb 5, 2024
Last updated Feb 5, 2024
Reviewed Feb 5, 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
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
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:N/A:N

EPSS score

0.108%
(44th percentile)

Weaknesses

CVE ID

CVE-2023-50781

GHSA ID

GHSA-944j-8ch6-rf6x

Source code

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