Description
Logto is the modern, open-source auth infrastructure for SaaS and AI apps. Prior to 1.41.0, Logto's existing TOTP verification accepted a successfully used TOTP code again while the code remained inside the RFC 6238 acceptance window because the verifier used otplib's stateless check with window = 1 and did not persist or compare the accepted TOTP time-step counter. An attacker who has the victim's first factor and captures a live TOTP value can replay that value to satisfy MFA during the same acceptance window. This issue is fixed in version 1.41.0.
Problem types
CWE-294: Authentication Bypass by Capture-replay
Product status
References
github.com/.../logto/security/advisories/GHSA-6wj7-c66m-6c82
github.com/logto-io/logto/pull/9109
github.com/...ommit/9118867f6cbadc7291cf913beb4fede91ed5d374
github.com/logto-io/logto/releases/tag/v1.41.0