{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "serve"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.5.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": true,
    "github_reviewed_at": "2020-08-31T18:29:10Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "Versions of `serve` before 6.5.2 are vulnerable to the bypass of the ignore functionality. The bypass is possible because validation happens before canonicalization of paths and filenames.\n\n\n\nExample:\nHere we have a server that ignores the file test.txt.\n```\nconst serve = require(\u0027serve\u0027)\nconst server = serve(__dirname, {\n      port: 1337,\n      ignore: [\u0027test.txt\u0027]\n})\n```\n\nUsing the URL encoded form of a letter (%65 instead of e) attacker can bypass the ignore control accessing the file. \n\n`curl http://localhost:1337/t%65st.txt`\n\nAdditionally this technique can be used to get directory listings of ignored directories.\n\n\n## Recommendation\n\nUpdate to version 6.5.2 or later.",
  "id": "GHSA-wm7q-rxch-43mx",
  "modified": "2020-08-31T18:29:10Z",
  "published": "2020-09-01T19:38:33Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://hackerone.com/reports/308721"
    },
    {
      "type": "WEB",
      "url": "https://www.npmjs.com/advisories/594"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [],
  "summary": "Byass due to validation before canonicalization in serve"
}