Non-Constant Time String Comparison Affecting csrf-lite package, versions <=0.1.1
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Test your applications- Snyk ID npm:csrf-lite:20160423
- published 22 Jun 2016
- disclosed 23 Apr 2016
- credit Todd Wolfson
Introduced: 23 Apr 2016
CVE-2016-10535 Open this link in a new tabHow to fix?
Update to version 0.1.2 or higher.
Overview
csrf-lite is a CSRF protection utility for framework-free node sites.
Affected versions of the package are vulnerable to a timing attack.
While the CSRF protection itself works well and increases security, the library uses the built-in string comparison mechanism, ===, and not a time constant string comparison. As a result, the comparison will fail faster when the first characters in the token are incorrect.
An attacker can use this difference to perform a timing attack, essentially allowing them to guess the CSRF token one character at a time.
You can read more about timing attacks in Node.js on the Snyk blog: https://snyk.io/blog/node-js-timing-attack-ccc-ctf/