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LinOTP replay vulnerability with auto resynchronization enabled for TOTP token

High severity GitHub Reviewed Published May 24, 2022 to the GitHub Advisory Database • Updated Apr 29, 2024

Package

pip LinOTP (pip)

Affected versions

< 2.10.5.3

Patched versions

2.10.5.3

Description

LinOTP is prone to a replay attack with activated automatic resynchronization. This vulnerability may allow an attacker to successfully log in with OTP values recorded at a previous point in time.

This attack is only possible if automatic resynchronization is enabled for the TOTP token type. The automatic resynchronization is deactivated by default. All other tokens are unaffected.

References

Published by the National Vulnerability Database Jun 27, 2019
Published to the GitHub Advisory Database May 24, 2022
Reviewed Apr 29, 2024
Last updated Apr 29, 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
High

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:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS score

0.263%
(66th percentile)

Weaknesses

CVE ID

CVE-2019-12887

GHSA ID

GHSA-rqg8-xjp2-pg9w

Source code

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