CVE-2023-51775

A flaw was found in the jose.4.j (jose4j) library. The JWE key management algorithms based on PBKDF2 require a JOSE Header Parameter called p2c (PBES2 Count). This parameter dictates the number of PBKDF2 iterations needed to derive a CEK wrapping key. Its primary purpose is to intentionally slow down the key derivation function, making password brute-force and dictionary attacks more resource-intensive. However, if an attacker sets the p2c parameter in JWE to a large number, it can cause high computational consumption, resulting in a denial of service.