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Observable Timing Discrepancy in totp-rs

Moderate severity GitHub Reviewed Published May 9, 2022 in constantoine/totp-rs • Updated Jun 13, 2023

Package

cargo totp-rs (Rust)

Affected versions

< 1.1.0

Patched versions

1.1.0

Description

Impact

Token comparison was not constant time, and could theorically be used to guess value of an TOTP token, and thus reuse it in the same time window. The attacker would have to know the password beforehand nonetheless.

Patches

Library now used constant-time comparison.

Workarounds

No.

For more information

If you have any questions or comments about this advisory:

References

@constantoine constantoine published to constantoine/totp-rs May 9, 2022
Published by the National Vulnerability Database May 20, 2022
Published to the GitHub Advisory Database May 24, 2022
Reviewed May 24, 2022
Last updated Jun 13, 2023

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
High
User interaction
Required
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:H/UI:R/S:U/C:H/I:N/A:N

EPSS score

0.104%
(43rd percentile)

Weaknesses

CVE ID

CVE-2022-29185

GHSA ID

GHSA-8vxv-2g8p-2249

Source code

Credits

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