{"id":"UBUNTU-CVE-2024-45614","details":"Puma is a Ruby/Rack web server built for parallelism. In affected versions clients could clobber values set by intermediate proxies (such as X-Forwarded-For) by providing a underscore version of the same header (X-Forwarded_For). Any users relying on proxy set variables is affected. v6.4.3/v5.6.9 now discards any headers using underscores if the non-underscore version also exists. Effectively, allowing the proxy defined headers to always win. Users are advised to upgrade. Nginx has a underscores_in_headers configuration variable to discard these headers at the proxy level as a mitigation. Any users that are implicitly trusting the proxy defined headers for security should immediately cease doing so until upgraded to the fixed versions.","modified":"2026-01-30T00:46:58.814351Z","published":"2024-09-20T00:00:00Z","related":["USN-7031-1","USN-7031-2"],"upstream":["CVE-2024-45614"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2024-45614"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2024-45614"},{"type":"REPORT","url":"https://github.com/puma/puma/security/advisories/GHSA-9hf4-67fc-4vf4"},{"type":"REPORT","url":"https://nginx.org/en/docs/http/ngx_http_core_module.html#underscores_in_headers"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-7031-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-7031-2"}],"affected":[{"package":{"name":"puma","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/puma@3.12.4-1ubuntu2+esm2?arch=source&distro=esm-apps/focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.12.4-1ubuntu2+esm2"}]}],"versions":["3.12.0-2ubuntu1","3.12.0-4ubuntu1","3.12.4-1ubuntu2","3.12.4-1ubuntu2+esm1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"puma","binary_version":"3.12.4-1ubuntu2+esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2024/UBUNTU-CVE-2024-45614.json"}},{"package":{"name":"puma","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/puma@5.5.2-2ubuntu2+esm2?arch=source&distro=esm-apps/jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.5.2-2ubuntu2+esm2"}]}],"versions":["4.3.6-1ubuntu4","5.5.2-2ubuntu2","5.5.2-2ubuntu2+esm1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"puma","binary_version":"5.5.2-2ubuntu2+esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2024/UBUNTU-CVE-2024-45614.json"}},{"package":{"name":"puma","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/puma@6.4.2-4ubuntu4.3?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.4.2-4ubuntu4.3"}]}],"versions":["5.6.5-4ubuntu2","5.6.5-4ubuntu3","6.4.2-4ubuntu1","6.4.2-4ubuntu3","6.4.2-4ubuntu4"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"6.4.2-4ubuntu4.3","binary_name":"puma"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2024/UBUNTU-CVE-2024-45614.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N"},{"type":"Ubuntu","score":"medium"}]}