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.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| devise-two-factor(RubyGems) | 4.0.0 | 6.0.0 | N/A |
| devise-two-factor(RubyGems) | N/A | N/A | N/A |
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