Insecure Token Validation Affecting node-jose Open this link in a new tab package, versions <0.11.0


0.0
high
  • Exploit Maturity

    Mature

  • Attack Complexity

    Low

  • Integrity

    High

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  • snyk-id

    npm:node-jose:20171222

  • published

    10 Jan 2018

  • disclosed

    22 Dec 2017

  • credit

    Unknown

Overview

node-jose is a JavaScript implementation of the JSON Object Signing and Encryption (JOSE) for current web browsers and node.js-based servers.

A vulnerability in the Cisco node-jose open source library before 0.11.0 could allow an unauthenticated, remote attacker to re-sign tokens using a key that is embedded within the token. The vulnerability is due to node-jose following the JSON Web Signature (JWS) standard for JSON Web Tokens (JWTs). This standard specifies that a JSON Web Key (JWK) representing a public key can be embedded within the header of a JWS. This public key is then trusted for verification. An attacker could exploit this by forging valid JWS objects by removing the original signature, adding a new public key to the header, and then signing the object using the (attacker-owned) private key associated with the public key embedded in that JWS header.