CVE-2018-0114 Information

Description

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.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Reference

http://www.securityfocus.com/bid/102445 https://github.com/cisco/node-jose/blob/master/CHANGELOG.md https://github.com/zi0Black/POC-CVE-2018-0114 https://tools.cisco.com/security/center/viewAlert.x?alertId=56326 https://www.exploit-db.com/exploits/44324/

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

HIGH

Base Score

NONE

Base Severity

7.5