{"id":"CVE-2018-18509","details":"A flaw during verification of certain S/MIME signatures causes emails to be shown in Thunderbird as having a valid digital signature, even if the shown message contents aren't covered by the signature. The flaw allows an attacker to reuse a valid S/MIME signature to craft an email message with arbitrary content. This vulnerability affects Thunderbird \u003c 60.5.1.","modified":"2026-04-16T00:07:22.904121472Z","published":"2019-04-26T17:29:00.243Z","related":["SUSE-SU-2019:0469-1","SUSE-SU-2019:0853-1","openSUSE-SU-2019:0249-1","openSUSE-SU-2019:0251-1","openSUSE-SU-2019:1162-1","openSUSE-SU-2024:10601-1"],"references":[{"type":"WEB","url":"http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00043.html"},{"type":"WEB","url":"https://github.com/RUB-NDS/Johnny-You-Are-Fired/blob/master/paper/johnny-fired.pdf"},{"type":"ADVISORY","url":"http://seclists.org/fulldisclosure/2019/Apr/38"},{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2019/04/30/4"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2019:1144"},{"type":"ADVISORY","url":"http://packetstormsecurity.com/files/152703/Johnny-You-Are-Fired.html"},{"type":"ADVISORY","url":"https://www.mozilla.org/security/advisories/mfsa2019-06/"},{"type":"REPORT","url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1507218"},{"type":"PACKAGE","url":"https://github.com/RUB-NDS/Johnny-You-Are-Fired"}],"affected":[{"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"0"},{"fixed":"60.5.1"}]}],"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2018-18509.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"}]}