A redirect vulnerability in the fastify-static module allows remote attackers to redirect Mozilla Firefox users to arbitrary websites via a double slash // followed by a domain: http://localhost:3000//a//youtube.com/%2e%2e%2f%2e%2e.
A DOS vulnerability is possible if the URL contains invalid characters curl --path-as-is "http://localhost:3000//^/.."
The issue shows up on all the fastify-static applications that set redirect: true option. By default, it is false.
The issue has been patched in fastify-static@4.4.1
If updating is not an option, you can sanitize the input URLs using the rewriteUrl server option.
If you have any questions or comments about this advisory:
{
"cwe_ids": [
"CWE-248",
"CWE-601"
],
"github_reviewed": true,
"github_reviewed_at": "2021-10-11T18:38:24Z",
"nvd_published_at": "2021-10-14T15:15:00Z",
"severity": "HIGH"
}