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.
References
Link | Resource |
---|---|
https://access.redhat.com/errata/RHSA-2018:3600 | |
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10903 | Issue Tracking Patch Third Party Advisory |
https://github.com/pyca/cryptography/pull/4342/commits/688e0f673bfbf43fa898994326c6877f00ab19ef | Patch Third Party Advisory |
https://usn.ubuntu.com/3720-1/ | Third Party Advisory |
History
No history.
MITRE Information
Status: PUBLISHED
Assigner: redhat
Published: 2018-07-30T15:00:00
Updated: 2018-11-14T10:57:02
Reserved: 2018-05-09T00:00:00
Link: CVE-2018-10903
JSON object: View
NVD Information
Status : Modified
Published: 2018-07-30T16:29:00.283
Modified: 2021-08-04T17:14:46.777
Link: CVE-2018-10903
JSON object: View
Redhat Information
No data.
CWE