🛡️ Sentinel: [CRITICAL] Fix timing attack vulnerability in token validation#266
🛡️ Sentinel: [CRITICAL] Fix timing attack vulnerability in token validation#266google-labs-jules[bot] wants to merge 1 commit into
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Replaced length checks and raw buffer comparisons with fixed-length SHA-256 hash comparisons before calling timingSafeEqual to prevent early short-circuits that leak token lengths.
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🚨 Severity: CRITICAL
💡 Vulnerability: The token validation in
serve.tscompared the lengths of the provided token and the stored auth token before callingcrypto.timingSafeEqual. This short-circuit evaluation creates a timing side-channel that leaks the expected length of the authentication token.🎯 Impact: An attacker could iteratively guess the correct length of the authentication token by measuring response times, significantly reducing the search space for brute-forcing the token.
🔧 Fix: Both the incoming token and the configured authentication token are now hashed using SHA-256 to a fixed length prior to comparison with
crypto.timingSafeEqual. This ensures the comparison always takes a constant amount of time regardless of input length.✅ Verification: Formatted code, passed lint checks, passed the targeted test
tests/unit/cli/commands/serve.test.ts, and verified no regressions by running the full test suite (bun run test:full).PR created automatically by Jules for task 11774691036750874286 started by @YoungSx