{"id":"UBUNTU-CVE-2018-7644","details":"The XmlSecLibs library as used in the saml2 library in SimpleSAMLphp before 1.15.3 incorrectly verifies signatures on SAML assertions, allowing a remote attacker to construct a crafted SAML assertion on behalf of an Identity Provider that would pass as cryptographically valid, thereby allowing them to impersonate a user from that Identity Provider, aka a key confusion issue.","modified":"2025-10-24T04:46:57Z","published":"2018-03-05T14:29:00Z","upstream":["CVE-2018-7644"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-7644"},{"type":"REPORT","url":"https://simplesamlphp.org/security/201802-01"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2018-7644"}],"affected":[{"package":{"name":"simplesamlphp","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/simplesamlphp@1.14.0-1ubuntu2?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.13.2-1","1.14.0-1","1.14.0-1ubuntu2"],"ecosystem_specific":{"binaries":[{"binary_version":"1.14.0-1ubuntu2","binary_name":"simplesamlphp"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-7644.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"type":"Ubuntu","score":"medium"}]}