CVE-2018-10903
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.
- Score
- CVSS 3.0 7.5 High
- Status
- Modified - secalert@redhat.com
- Published
- 2018-07-30
- Last modified
- 2024-08-05
- Weaknesses
- CWE-20
Affected products
- Ubuntu Linux (Canonical)
- Python-cryptography (Cryptography)
- Openstack (Redhat)
- Python-cryptography (Unknown)
References
- https://access.redhat.com/errata/RHSA-2018:3600
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10903
- https://github.com/pyca/cryptography/pull/4342/commits/688e0f673bfbf43fa898994326c6877f00ab19ef
- https://usn.ubuntu.com/3720-1/
