| Package | Affected versions | Patched versions |
|---|---|---|
| cryptography | ≥ 1.9, < 2.3≥ 1.9.0, < 2.3 | 2.3 |
| python-cryptography | ≥ 1.9.0, < 2.3 | 2.3 |
| openstack | = 13 |
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.
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