{"id":"GHSA-h924-8g65-j9wg","summary":"Traefik's X-Forwarded-Prefix Header still allows for Open Redirect","details":"### Impact\n\nThere is a vulnerability in Traefik that allows the client to provide the `X-Forwarded-Prefix` header from an untrusted source.\n\n### Patches\n\n- https://github.com/traefik/traefik/releases/tag/v2.11.14\n- https://github.com/traefik/traefik/releases/tag/v3.2.1\n\n### Workarounds\n\nNo workaround.\n\n### For more information\n\nIf you have any questions or comments about this advisory, please [open an issue](https://github.com/traefik/traefik/issues).\n\n\u003cdetails\u003e\n\u003csummary\u003eOriginal Description\u003c/summary\u003e\n### Summary\nThe previously reported open redirect ([GHSA-6qq8-5wq3-86rp](https://github.com/traefik/traefik/security/advisories/GHSA-6qq8-5wq3-86rp)) is not fixed correctly. The safePrefix function can be tricked to return an absolute URL.\n\n\n\n### Details\nThe Traefik API [dashboard component](https://github.com/traefik/traefik/blob/master/pkg/api/dashboard/dashboard.go) tries to validate that the value of the header X-Forwarded-Prefix is a site relative path:\n```go\nhttp.Redirect(resp, req, safePrefix(req)+\"/dashboard/\", http.StatusFound)\n```\n\n```go\nfunc safePrefix(req *http.Request) string {\n\tprefix := req.Header.Get(\"X-Forwarded-Prefix\")\n\tif prefix == \"\" {\n\t\treturn \"\"\n\t}\n\n\tparse, err := url.Parse(prefix)\n\tif err != nil {\n\t\treturn \"\"\n\t}\n\n\treturn parse.Path\n}\n```\n\n### PoC\nAn attacker can bypass this by sending the following payload:\n\n```bash\ncurl -v 'http://traefik.localhost' -H 'X-Forwarded-Prefix: %0d//a.com'\n[...]\n\u003e HTTP/1.1 302 Found\n\u003e Location: //a.com/dashboard/\n```\n\nor similar:\n\n```bash\ncurl -v 'http://traefik.localhost' -H 'X-Forwarded-Prefix: %2f%2fa.com'\n[...]\n\u003e HTTP/1.1 302 Found\n\u003e Location: //a.com/dashboard/\n```\n\n### Impact\nSimilar to the previously reported bug. In cache poisoning scenarios this may be exploitable.\n\u003c/details\u003e","aliases":["CVE-2024-52003","GO-2024-3299"],"modified":"2026-09-10T03:50:21.594811133Z","published":"2024-12-02T17:12:38Z","database_specific":{"github_reviewed_at":"2024-12-02T17:12:38Z","nvd_published_at":"2024-11-29T19:15:08Z","cwe_ids":["CWE-601"],"severity":"MODERATE","github_reviewed":true},"references":[{"type":"WEB","url":"https://github.com/traefik/traefik/security/advisories/GHSA-h924-8g65-j9wg"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-52003"},{"type":"WEB","url":"https://github.com/traefik/traefik/pull/11253"},{"type":"PACKAGE","url":"https://github.com/traefik/traefik"},{"type":"WEB","url":"https://github.com/traefik/traefik/releases/tag/v2.11.14"},{"type":"WEB","url":"https://github.com/traefik/traefik/releases/tag/v3.2.1"}],"affected":[{"package":{"name":"github.com/traefik/traefik/v2","ecosystem":"Go","purl":"pkg:golang/github.com/traefik/traefik/v2"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.11.14"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2024/12/GHSA-h924-8g65-j9wg/GHSA-h924-8g65-j9wg.json"}},{"package":{"name":"github.com/traefik/traefik/v3","ecosystem":"Go","purl":"pkg:golang/github.com/traefik/traefik/v3"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.2.1"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2024/12/GHSA-h924-8g65-j9wg/GHSA-h924-8g65-j9wg.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"}]}