Avoid allowing access to unintended directories or files

Cette page n'est pas encore disponible en français, sa traduction est en cours.
Si vous avez des questions ou des retours sur notre projet de traduction actuel, n'hésitez pas à nous contacter.

Metadata

ID: javascript-express/path-traversal

Language: JavaScript

Severity: Warning

Category: Security

CWE: 22

Description

By not sanitizing user input prior to using it in path resolution methods you open your application’s access to unintended directories and files.

If you’re using replace on a user input, this rule will assume you’ve done so correctly and will not report a violation

Learn More

Non-Compliant Code Examples

const path = require("path");

app.get("/", (req, res) => {
  path.join("/user/", req.params.path)

  var pathname = path.join("/public/", req.body.foo)
  path.resolve(pathname)

  path.resolve(__dirname, req.body.foo)
  path.resolve(__dirname, `${req.body.foo}`)
})

Compliant Code Examples

const path = require("path");

app.get("/", (req, res) => {
  path.join("/user/", req.params.path.replace(/^(\.\.(\/|\\|$))+/, ''))

  var pathname = path.join("/public/", req.body.foo.replace(/^(\.\.(\/|\\|$))+/, ''))
  path.resolve(pathname)

  path.resolve(__dirname, req.body.foo.replace(/^(\.\.(\/|\\|$))+/, ''))
  path.resolve(__dirname, `${req.body.foo.replace(/^(\.\.(\/|\\|$))+/, '')}`)
})