{"id":"UBUNTU-CVE-2019-3878","details":"A vulnerability was found in mod_auth_mellon before v0.14.2. If Apache is configured as a reverse proxy and mod_auth_mellon is configured to only let through authenticated users (with the require valid-user directive), adding special HTTP headers that are normally used to start the special SAML ECP (non-browser based) can be used to bypass authentication.","modified":"2026-01-30T01:59:07.136816Z","published":"2019-03-21T00:00:00Z","related":["USN-3924-1","USN-4597-1"],"upstream":["CVE-2019-3878"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2019-3878"},{"type":"REPORT","url":"https://github.com/Uninett/mod_auth_mellon/pull/196"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-3924-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4597-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2019-3878"}],"affected":[{"package":{"name":"libapache2-mod-auth-mellon","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/libapache2-mod-auth-mellon@0.12.0-2+deb9u1build0.16.04.1?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.12.0-2+deb9u1build0.16.04.1"}]}],"versions":["0.10.0-1","0.11.0-1","0.12.0-1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"0.12.0-2+deb9u1build0.16.04.1","binary_name":"libapache2-mod-auth-mellon"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-3878.json"}},{"package":{"name":"libapache2-mod-auth-mellon","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/libapache2-mod-auth-mellon@0.13.1-1ubuntu0.1?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.13.1-1ubuntu0.1"}]}],"versions":["0.13.1-1","0.13.1-1build1","0.13.1-1build2"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"0.13.1-1ubuntu0.1","binary_name":"libapache2-mod-auth-mellon"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-3878.json"}},{"package":{"name":"libapache2-mod-auth-mellon","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/libapache2-mod-auth-mellon@0.14.2-1ubuntu1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.14.2-1ubuntu1"}]}],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"0.14.2-1ubuntu1","binary_name":"libapache2-mod-auth-mellon"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-3878.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"},{"type":"Ubuntu","score":"medium"}]}