CVE-2022-40482: Observable Discrepancy

April 25, 2023 (updated May 4, 2023)

The authentication method in Laravel 8.x through 9.x before 9.32.0 was discovered to be vulnerable to user enumeration via timeless timing attacks with HTTP/2 multiplexing. This is caused by the early return inside the hasValidCredentials method in the Illuminate\Auth\SessionGuard class when a user is found to not exist.

References

ephort.dk/blog/laravel-timing-attack-vulnerability/
github.com/ephort/laravel-user-enumeration-demo
github.com/laravel/framework/pull/44069
github.com/laravel/framework/releases/tag/v9.32.0
nvd.nist.gov/vuln/detail/CVE-2022-40482

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