CVE-2021-23387: URL Redirection to Untrusted Site ('Open Redirect') (CWE-601)
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.
CWE description: 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.
CVSS v3 base score: 6.1
Published: 2021-05-24T19:15Z
Repository: https://github.com/fardog/trailing-slash
Language: JavaScript
Files changed: .travis.yml, index.js, package-lock.json, test.js
Commit date: 2021-05-08 22:40:39 -0700
Commit message: fix open redirect (#3)

* fix open redirect

* update node versions
Diff: diff --git a/.travis.yml b/.travis.yml
index b29cf66..acf72d7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,5 @@
 language: node_js
 node_js:
-  - "4"
-  - "6"
+  - "10"
+  - "12"
+  - "14"
diff --git a/index.js b/index.js
index e7ea1ab..5a47e88 100644
--- a/index.js
+++ b/index.js
@@ -31,9 +31,16 @@ function createTrailing (_options, _next) {
     } else {
       url.pathname = url.pathname.slice(0, -1)
     }
 
     res.statusCode = status
-    res.setHeader('Location', u.format(url))
+    res.setHeader('Location', escapeLeadingSlashes(u.format(url)))
     res.end()
   }
 }
+
+function escapeLeadingSlashes (url) {
+  if (url.slice(0, 2) === '//') {
+    return '/%2F' + url.slice(2)
+  }
+  return url
+}
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..f5fb891
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,1650 @@
+{
+  "name": "trailing-slash",
+  "version": "2.0.0",
+  "lockfileVersion": 1,
+  "requires": true,
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+      "dev": true
+    },
+    "acorn-jsx": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-3.0.1.tgz",
+      "integrity": "sha1-r9+UiPsezvyDSPb7IvRk4ypYs2s=",
+      "dev": true,
+      "requires": {
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+      },
+      "dependencies": {
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+          "resolved": "https://registry.npmjs.org/acorn/-/acorn-3.3.0.tgz",
+          "integrity": "sha1-ReN/s56No/JbruP/U2niu18iAXo=",
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diff --git a/test.js b/test.js
index 6d764e7..6b8894e 100644
--- a/test.js
+++ b/test.js
@@ -222,5 +222,27 @@ test('test connect middleware feature, options', function (t) {
 
   function done () {
     t.pass('called next')
   }
 })
+
+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
+  }
+})

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
}
{
  "name": "trailing-slash",
  "version": "2.0.0",
  "lockfileVersion": 1,
  "requires": true,
  "dependencies": {
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      "dev": true
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      "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
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      "dev": true,
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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
  }
})