Integer overflow

In Nimbus JOSE+JWT before 4.39, there is no integer-overflow check when converting length values from bytes to bits, which allows attackers to conduct HMAC bypass attacks by shifting Additional Authenticated Data AAD and ciphertext so that different plaintext is obtained for the same HMAC...

CVE-2017-12972

CVE-2017-12972 : Nimbus JOSE+JWT before 4.39 has no integer-overflow check when converting length values from bytes to bits, enabling a remote attacker to perform a HMAC bypass by shifting AAD and ciphertext so different plaintext yields the same HMAC. Public records show this vulnerability discu...