Description
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.
Analysis and contextual insights are available on OpenCVE Cloud.
Remediation
No vendor fix or workaround currently provided.
Additional remediation guidance may be available on OpenCVE Cloud.
Tracking
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Advisories
| Source | ID | Title |
|---|---|---|
EUVD |
EUVD-2018-0030 | 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. |
Github GHSA |
GHSA-fcf9-3qw3-gxmj | PyCA Cryptography vulnerable to GCM tag forgery |
Ubuntu USN |
USN-3720-1 | python-cryptography vulnerability |
References
History
No history.
Status: PUBLISHED
Assigner: redhat
Published:
Updated: 2024-08-05T07:54:36.330Z
Reserved: 2018-05-09T00:00:00.000Z
Link: CVE-2018-10903
No data.
Status : Modified
Published: 2018-07-30T16:29:00.283
Modified: 2024-11-21T03:42:16.003
Link: CVE-2018-10903
OpenCVE Enrichment
No data.
Weaknesses
EUVD
Github GHSA
Ubuntu USN