{"id":"UBUNTU-CVE-2025-27773","details":"The SimpleSAMLphp SAML2 library is a PHP library for SAML2 related functionality. Prior to versions 4.17.0 and 5.0.0-alpha.20, there is a signature confusion attack in the HTTPRedirect binding. An attacker with any signed SAMLResponse via the HTTP-Redirect binding can cause the application to accept an unsigned message. Versions 4.17.0 and 5.0.0-alpha.20 contain a fix for the issue.","modified":"2026-09-15T20:16:38.366034048Z","published":"2025-03-11T19:15:00Z","related":["USN-8770-1"],"upstream":["CVE-2025-27773"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-27773"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2025-27773"},{"type":"REPORT","url":"https://github.com/simplesamlphp/saml2/security/advisories/GHSA-46r4-f8gj-xg56"},{"type":"REPORT","url":"https://github.com/simplesamlphp/saml2/commit/7867d6099dc7f31bed1ea10e5bea159c5623d2a0"},{"type":"REPORT","url":"https://github.com/simplesamlphp/saml2/blob/9545abd0d9d48388f2fa00469c5c1e0294f0303e/src/SAML2/HTTPRedirect.php#L104-L113"},{"type":"REPORT","url":"https://github.com/simplesamlphp/saml2/blob/9545abd0d9d48388f2fa00469c5c1e0294f0303e/src/SAML2/HTTPRedirect.php#L178-L217"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8770-1"}],"affected":[{"package":{"name":"simplesamlphp","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/simplesamlphp?arch=source&distro=esm-apps-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.14.0-1ubuntu2+esm1"}]}],"versions":["1.13.2-1","1.14.0-1","1.14.0-1ubuntu2"],"ecosystem_specific":{"binaries":[{"binary_version":"1.14.0-1ubuntu2+esm1","binary_name":"simplesamlphp"}],"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-27773.json"}},{"package":{"name":"simplesamlphp","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/simplesamlphp?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.15.3-1ubuntu0.1~esm1"}]}],"versions":["1.14.15-1","1.15.0-1","1.15.1-1","1.15.2-1","1.15.3-1"],"ecosystem_specific":{"binaries":[{"binary_name":"simplesamlphp","binary_version":"1.15.3-1ubuntu0.1~esm1"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-27773.json"}},{"package":{"name":"simplesamlphp","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/simplesamlphp?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.18.4-1ubuntu0.1~esm1"}]}],"versions":["1.17.5-1","1.17.6-1","1.17.6-2","1.18.1-1","1.18.4-1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_version":"1.18.4-1ubuntu0.1~esm1","binary_name":"simplesamlphp"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-27773.json"}},{"package":{"name":"simplesamlphp","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/simplesamlphp?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.19.1-1.1ubuntu0.1~esm1"}]}],"versions":["1.19.1-1","1.19.1-1.1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.19.1-1.1ubuntu0.1~esm1","binary_name":"simplesamlphp"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-27773.json"}},{"package":{"name":"simplesamlphp","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/simplesamlphp?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.19.7-1+deb12u1ubuntu0.1"}]}],"versions":["1.19.7-1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.19.7-1+deb12u1ubuntu0.1","binary_name":"simplesamlphp"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-27773.json"}},{"package":{"name":"simplesamlphp","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/simplesamlphp?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.19.7-1+deb12u1","1.19.7-2"],"ecosystem_specific":{"binaries":[{"binary_name":"simplesamlphp","binary_version":"1.19.7-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-27773.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N"},{"type":"Ubuntu","score":"medium"}]}