A flaw was found in python-cryptography versions between >=1.9.0 and <2.3. The finalize_with_tag API did not enforce a minimum tag length. If a user did not validate the input length prior to passing it to finalize_with_tag an attacker could craft an invalid payload with a shortened tag (e.g. 1 byte) such that they would have a 1 in 256 chance of passing the MAC check. GCM tag forgeries can cause key leakage.
CPE | Name | Operator | Version |
---|---|---|---|
cryptography | eq | 1.0 | |
cryptography | eq | 0.9 | |
cryptography | eq | 1.4 | |
cryptography | eq | 1.1 | |
cryptography | eq | 1.2 | |
cryptography | eq | 0.5 | |
cryptography | eq | 0.4 | |
cryptography | eq | 2.0 | |
cryptography | eq | 0.8 | |
cryptography | eq | 1.7 |