CVE-2021-23387 (JavaScript, published 2021-05-24T19:15Z)
Description: value: The package trailing-slash before 2.0.1 are vulnerable to Open Redirect via the use of trailing double slashes in the URL when accessing the vulnerable endpoint (such as https://example.com//attacker.example/). The vulnerable code is in index.js::createTrailing(), as the web server uses relative URLs instead of absolute URLs.
Severity: MEDIUM (CVSS v3 base score: 6.1)
Weakness: CWE-601 \u2014 URL Redirection to Untrusted Site ('Open Redirect')
A web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a Redirect. This simplifies phishing attacks.
Repository: https://github.com/fardog/trailing-slash
Files changed:
.travis.yml
index.js
package-lock.json
test.js
Commit message: fix open redirect (#3)

* fix open redirect

* update node versions

Vulnerable code:
  - "4"
  - "6"
    res.setHeader('Location', u.format(url))

Fixed code:
  - "10"
  - "12"
  - "14"
    res.setHeader('Location', escapeLeadingSlashes(u.format(url)))

function escapeLeadingSlashes (url) {
  if (url.slice(0, 2) === '//') {
    return '/%2F' + url.slice(2)
  }
  return url
}
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}

test('escapes leading slashes in url', function (t) {
  t.plan(3)

  var redirect = trailing({slash: true}, fail)
  var req = {url: '//something/else'}
  var res = {
    setHeader: function (name, value) {
      t.equal(name, 'Location')
      t.equal(value, '/%2Fsomething/else/')
    },
    end: function () {
      t.ok(true)
    }
  }

  redirect(req, res)

  function fail (request, response) {
    t.ok(false) // fail if we reach here
  }
})