Under the default configuration, Devise-Two-Factor versions >= 2.2.0 & < 6.0.0 generate TOTP shared secrets that are 120 bits instead of the 128-bit minimum defined by RFC 4226. Using a shared secret shorter than the minimum to generate a multi-factor authentication code could make it easier for an attacker to guess the shared secret and generate valid TOTP codes.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | No solution exists | May 15, 2025 | Sep 17, 2024 |
| Ubuntu | — | Upgrade ruby-devise-two-factor (Ubuntu Pro) | Oct 2, 2024 | Sep 17, 2024 |
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