Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| [UNKNOWN] / python-cryptography | affected 2.3 |
CWE
CWE-20
References
- https://access.redhat.com/errata/RHSA-2018:3600
- https://usn.ubuntu.com/3720-1/
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10903
- https://github.com/pyca/cryptography/pull/4342/commits/688e0f673bfbf43fa898994326c6877f00ab19ef
ADP enrichment
No English description supplied.