Vulnerabilities > CVE-2023-48223 - Unspecified vulnerability in Nearform Fast-Jwt

CVSS 5.9 - MEDIUM

Attack vector

NETWORK

Attack complexity

HIGH

Privileges required

NONE

Confidentiality impact

NONE

Integrity impact

HIGH

Availability impact

NONE

network

high complexity

nearform

NVD

Published: 2023-11-20

Updated: 2024-11-21

Summary

fast-jwt provides fast JSON Web Token (JWT) implementation. Prior to version 3.3.2, the fast-jwt library does not properly prevent JWT algorithm confusion for all public key types. The 'publicKeyPemMatcher' in 'fast-jwt/src/crypto.js' does not properly match all common PEM formats for public keys. To exploit this vulnerability, an attacker needs to craft a malicious JWT token containing the HS256 algorithm, signed with the public RSA key of the victim application. This attack will only work if the victim application utilizes a public key containing the `BEGIN RSA PUBLIC KEY` header. Applications using the RS256 algorithm, a public key with a `BEGIN RSA PUBLIC KEY` header, and calling the verify function without explicitly providing an algorithm, are vulnerable to this algorithm confusion attack which allows attackers to sign arbitrary payloads which will be accepted by the verifier. Version 3.3.2 contains a patch for this issue. As a workaround, change line 29 of `blob/master/src/crypto.js` to include a regular expression.

Vulnerable Configurations

Part	Description	Count
Application	Nearform Nearform Fast JWT - Nearform Fast JWT 0.1.0 Nearform Fast JWT 0.1.1 Nearform Fast JWT 0.2.0 Nearform Fast JWT 0.3.0 Nearform Fast JWT 0.3.1 Nearform Fast JWT 0.4.0 Nearform Fast JWT 0.4.1 Nearform Fast JWT 0.4.2 Nearform Fast JWT 0.5.0 Nearform Fast JWT 0.5.1 Nearform Fast JWT 1.0.0 Nearform Fast JWT 1.1.0 Nearform Fast JWT 1.1.1 Nearform Fast JWT 1.1.2 Nearform Fast JWT 1.1.3 Nearform Fast JWT 1.2.0 Nearform Fast JWT 1.3.0 Nearform Fast JWT 1.3.1 Nearform Fast JWT 1.3.2 Nearform Fast JWT 1.4.0 Nearform Fast JWT 1.4.1 Nearform Fast JWT 1.5.0 Nearform Fast JWT 1.5.1 Nearform Fast JWT 1.5.2 Nearform Fast JWT 1.5.3 Nearform Fast JWT 1.5.4 Nearform Fast JWT 1.6.0 Nearform Fast JWT 1.6.1 Nearform Fast JWT 1.7.0 Nearform Fast JWT 1.7.1 Nearform Fast JWT 1.7.2 Nearform Fast JWT 2.0.0 Nearform Fast JWT 2.0.2 Nearform Fast JWT 2.1.0 Nearform Fast JWT 2.2.0 Nearform Fast JWT 2.2.1 Nearform Fast JWT 2.2.2 Nearform Fast JWT 2.2.3 Nearform Fast JWT 3.0.0 Nearform Fast JWT 3.1.0 Nearform Fast JWT 3.1.1 Nearform Fast JWT 3.2.0 Nearform Fast JWT 3.3.0 Nearform Fast JWT 3.3.1	45

Summary

Vulnerable Configurations

References