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.
History

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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published: 2018-07-30T15:00:00

Updated: 2024-08-05T07:54:36.330Z

Reserved: 2018-05-09T00:00:00

Link: CVE-2018-10903

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2018-07-30T16:29:00.283

Modified: 2024-11-21T03:42:16.003

Link: CVE-2018-10903

cve-icon Redhat

Severity : Moderate

Publid Date: 2018-07-18T00:00:00Z

Links: CVE-2018-10903 - Bugzilla