CVE-2021-23387 (published 2021-05-24T19:15Z)

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 v2 base score: 5.8 (AV:N/AC:M/Au:N/C:P/I:P/A:N)
CVSS v3 base score: 6.1, MEDIUM (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N)

Weakness information:
cwe_id: CWE-601
cwe_name: URL Redirection to Untrusted Site ('Open Redirect')
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.
extended_description: An http parameter may contain a URL value and could cause the web application to redirect the request to the specified URL. By modifying the URL value to a malicious site, an attacker may successfully launch a phishing scam and steal user credentials. Because the server name in the modified link is identical to the original site, phishing attempts have a more trustworthy appearance. Whether this issue poses a vulnerability will be subject to the intended behavior of the application. For example, a search engine might intentionally provide redirects to arbitrary URLs.
         

Fix information:
repo_url: https://github.com/fardog/trailing-slash
commit_details: repo_url: https://github.com/fardog/trailing-slash
author: Nathan Wittstock
author_date: 2021-05-08 22:40:39-07:00
msg: fix open redirect (#3)

* fix open redirect

* update node versions
repository: repo_url: https://github.com/fardog/trailing-slash
repo_name: fardog/trailing-slash
description: Add or remove trailing slashes, and redirect.
repo_language: JavaScript
owner: fardog
file_changes: filename: .travis.yml
change_type: ModificationType.MODIFY
diff: @@ -1,4 +1,5 @@
 language: node_js
 node_js:
-  - "4"
-  - "6"
+  - "10"
+  - "12"
+  - "14"

programming_language: CoffeeScript
filename: index.js
change_type: ModificationType.MODIFY
diff: @@ -33,7 +33,14 @@ function createTrailing (_options, _next) {
     }
 
     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
+}

programming_language: CoffeeScript
filename: package-lock.json
change_type: ModificationType.ADD
diff: @@ -0,0 +1,1650 @@
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+}

programming_language: JavaScript
filename: test.js
change_type: ModificationType.MODIFY
diff: @@ -224,3 +224,25 @@ test('test connect middleware feature, options', function (t) {
     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
+  }
+})

programming_language: JavaScript