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CVE-2018-0114

Status Candidate

Overview

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.

Related Files

Cisco node-jos Resign Tokens Proof Of Concept
Posted Mar 22, 2018
Authored by Andrea Cappa

Cisco node-jos versions prior to 0.11.0 re-sign tokens proof of concept exploit.

tags | exploit, proof of concept
systems | cisco
advisories | CVE-2018-0114
SHA-256 | f7e488909b769cf6fe758f382777f08b2e3b059dea0c5b6c8ed8e7fb3e555bec
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