Generation of Predictable Numbers or Identifiers Affecting org.webjars.npm:pbkdf2 package, versions [0,]
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-JAVA-ORGWEBJARSNPM-10495499
- published24 Jun 2025
- disclosed23 Jun 2025
- creditNikita Skovoroda
Introduced: 23 Jun 2025
NewCVE-2025-6547 (opens in a new tab)How to fix?
A fix was pushed into the master branch but not yet published.
Overview
Affected versions of this package are vulnerable to Generation of Predictable Numbers or Identifiers via the toBuffer function. An attacker can predict cryptographic keys that were generated using Uint8Array inputs on affected Node.js versions, leading to compromised security of derived keys or passwords.
Note: This is only exploitable when used in the environment running Node.js or io.js in versions lower than 3.0.0.
Mitigation
Updating to a fixed version isn't sufficient if PBKDF2 was used directly or via a bundling package with algorithm arguments outside the specified list. Verify where those keys are stored, how they are used, and take necessary actions like rotation or replacement.
PoC
require('pbkdf2').pbkdf2Sync(new Uint8Array([1,2,3]), new Uint8Array([1,3,4]), 1024, 32, 'sha256')