CVE-2021-46743: Access of Resource Using Incompatible Type ('Type Confusion')

March 29, 2022 (updated April 8, 2022)

In Firebase PHP-JWT before 6.0.0, an algorithm-confusion issue (e.g., RS256 / HS256) exists via the kid (aka Key ID) header, when multiple types of keys are loaded in a key ring. This allows an attacker to forge tokens that validate under the incorrect key. NOTE: this provides a straightforward way to use the PHP-JWT library unsafely, but might not be considered a vulnerability in the library itself.

References

github.com/firebase/php-jwt/issues/351
nvd.nist.gov/vuln/detail/CVE-2021-46743

Code Behaviors & Features

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