{"id":"GHSA-fcf9-3qw3-gxmj","summary":"PyCA Cryptography vulnerable to GCM tag forgery","details":"A flaw was found in python-cryptography versions between \u003e=1.9.0 and \u003c2.3. 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.","aliases":["CVE-2018-10903","PYSEC-2018-52"],"modified":"2024-09-13T18:24:32.976877Z","published":"2018-07-31T18:28:09Z","database_specific":{"cwe_ids":["CWE-20"],"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2020-06-16T21:34:18Z","nvd_published_at":null},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2018-10903"},{"type":"WEB","url":"https://github.com/pyca/cryptography/pull/4342"},{"type":"WEB","url":"https://github.com/pyca/cryptography/commit/d4378e42937b56f473ddade2667f919ce32208cb"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2018:3600"},{"type":"WEB","url":"https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10903"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-fcf9-3qw3-gxmj"},{"type":"PACKAGE","url":"https://github.com/pyca/cryptography"},{"type":"WEB","url":"https://github.com/pypa/advisory-database/tree/main/vulns/cryptography/PYSEC-2018-52.yaml"},{"type":"WEB","url":"https://usn.ubuntu.com/3720-1"}],"affected":[{"package":{"name":"cryptography","ecosystem":"PyPI","purl":"pkg:pypi/cryptography"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.9.0"},{"fixed":"2.3"}]}],"versions":["1.9","2.0","2.0.1","2.0.2","2.0.3","2.1","2.1.1","2.1.2","2.1.3","2.1.4","2.2","2.2.1","2.2.2"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2018/07/GHSA-fcf9-3qw3-gxmj/GHSA-fcf9-3qw3-gxmj.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"}]}