{"id":"GHSA-q2qj-628g-vhfw","summary":"Insecure header validation in slim/psr7","details":"### Impact\n\nAn attacker could sneak in a newline (`\\n`) into both the header names and values. While the specification states that `\\r\\n\\r\\n` is used to terminate the header list, many servers in the wild will also accept `\\n\\n`. An attacker that is able to control the header names that are passed to Slilm-Psr7 would be able to intentionally craft invalid messages, possibly causing application errors or invalid HTTP requests being sent out with an PSR-18 HTTP client. The latter might present a denial of service vector if a remote service’s web application firewall bans the application due to the receipt of malformed requests.\n\n### Patches\n\nThe issue is patched in 1.6.1, 1.5.1, and 1.4.1.\n\n### Workarounds\n\nIn Slim-Psr7 prior to 1.6.1, 1.5.1, and 1.4.1, validate HTTP header keys and/or values, and if using user-supplied values, filter them to strip off leading or trailing newline characters before calling withHeader().\n\n### Acknowledgments\n\nWe are very grateful to and thank \u003ca href=\"https://gjcampbell.co.uk/\"\u003eGraham Campbell\u003c/a\u003e for reporting and working with us on this issue.\n\n### References\n\n* Guzzle: CVE-2023-29197, with advisory GHSA-wxmh-65f7-jcvw\n* Laminas Diactoros: CVE-2023-29530, with advisory GHSA-xv3h-4844-9h36\n* https://www.rfc-editor.org/rfc/rfc7230#section-3.2.4","aliases":["CVE-2023-30536"],"modified":"2023-11-04T05:22:56.597214Z","published":"2023-04-18T22:20:42Z","database_specific":{"nvd_published_at":"2023-04-17T22:15:10Z","cwe_ids":["CWE-436"],"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2023-04-18T22:20:42Z"},"references":[{"type":"WEB","url":"https://github.com/slimphp/Slim-Psr7/security/advisories/GHSA-q2qj-628g-vhfw"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-30536"},{"type":"WEB","url":"https://github.com/slimphp/Slim-Psr7/issues/284#issuecomment-1541328898"},{"type":"WEB","url":"https://github.com/slimphp/Slim-Psr7/commit/ed1d553225dd190875d8814c47460daed4b550bb"},{"type":"PACKAGE","url":"https://github.com/slimphp/Slim-Psr7"},{"type":"WEB","url":"https://github.com/slimphp/Slim-Psr7/releases/tag/1.4.1"},{"type":"WEB","url":"https://github.com/slimphp/Slim-Psr7/releases/tag/1.5.1"},{"type":"WEB","url":"https://github.com/slimphp/Slim-Psr7/releases/tag/1.6.1"},{"type":"WEB","url":"https://www.rfc-editor.org/rfc/rfc7230#section-3.2.4"}],"affected":[{"package":{"name":"slim/psr7","ecosystem":"Packagist","purl":"pkg:composer/slim/psr7"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.6"},{"fixed":"1.6.1"}]}],"versions":["1.6"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/04/GHSA-q2qj-628g-vhfw/GHSA-q2qj-628g-vhfw.json"}},{"package":{"name":"slim/psr7","ecosystem":"Packagist","purl":"pkg:composer/slim/psr7"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.5"},{"fixed":"1.5.1"}]}],"versions":["1.5"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/04/GHSA-q2qj-628g-vhfw/GHSA-q2qj-628g-vhfw.json"}},{"package":{"name":"slim/psr7","ecosystem":"Packagist","purl":"pkg:composer/slim/psr7"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.1"}]}],"versions":["0.1.0","0.2.0","0.3.0","0.4.0","0.5.0","0.6","1.0.0","1.1.0","1.2.0","1.3.0","1.4"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/04/GHSA-q2qj-628g-vhfw/GHSA-q2qj-628g-vhfw.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L"}]}