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.
Published: 2018-07-30
Score: 7.5 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
EUVD 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 Github GHSA GHSA-fcf9-3qw3-gxmj PyCA Cryptography vulnerable to GCM tag forgery
Ubuntu USN Ubuntu USN USN-3720-1 python-cryptography vulnerability
History

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Subscriptions

Canonical Ubuntu Linux
Cryptography Python-cryptography
Redhat Openstack
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

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

Reserved: 2018-05-09T00:00:00.000Z

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

cve-icon OpenCVE Enrichment

No data.

Weaknesses