Skip to content

Secret encryption vulnerable to brute-force attacks

High
mymindstorm published GHSA-gv8m-vgp8-q2xr Sep 3, 2024

Package

Authenticator Extension (Chrome Web Store)

Affected versions

<=7.0.0

Patched versions

>=8.0.0
Authenticator Extension (Firefox Add-ons)
<=7.0.0
>=8.0.0
Authenticator Extension (Edge Add-ons)
<=7.0.0
>=8.0.0

Description

Summary

In versions 7.0.0 and below, encryption keys for user data were stored encrypted at-rest using only AES-256 and the EVP_BytesToKey KDF. Therefore, attackers with a copy of a user's data are able to brute-force the user's encryption key.

Recommended Actions

  • Users on version 8.0.0 and above are automatically migrated away from the weak encoding on first login.
  • Users should destroy encrypted backups made with prior versions.

References

Acknowledgements

We would like to thank Laurent Weber, CISO of the University of Luxembourg for sharing and sponsoring the code review which discovered this vulnerability.

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
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Changed
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:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVE ID

CVE-2024-45394

Weaknesses