Insecure Token Validation Affecting node-jose package, versions <0.11.0


0.0
high

Snyk CVSS

    Exploit Maturity Mature
    Attack Complexity Low
    Integrity High
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NVD
7.5 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.