Open Redirect Affecting trailing-slash package, versions <2.0.1


Severity

Recommended
0.0
medium
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

Exploit Maturity
Proof of concept
EPSS
0.11% (45th percentile)

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  • Snyk IDSNYK-JS-TRAILINGSLASH-1085707
  • published17 May 2021
  • disclosed15 Mar 2021
  • creditapple502j

Introduced: 15 Mar 2021

CVE-2021-23387  (opens in a new tab)
CWE-601  (opens in a new tab)
First added by Snyk

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

CVSS Scores

version 3.1