Open Redirect Affecting trailing-slash package, versions <2.0.1


0.0
medium

Snyk CVSS

    Exploit Maturity Proof of concept
    Attack Complexity Low
    User Interaction Required
Expand this section
NVD
6.1 medium

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  • Snyk ID SNYK-JS-TRAILINGSLASH-1085707
  • published 17 May 2021
  • disclosed 15 Mar 2021
  • credit apple502j

How to fix?

Upgrade trailing-slash to version 2.0.1 or higher.

Overview

trailing-slash is an Add or remove trailing slashes, and redirect.

Affected versions of this package 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.

PoC

1. Set up an server endpoint that uses trailing-slashes
2. Append "//example.com" to the endpoint - it should redirect to example.com