nearform fast-jwt up to 3.3.1 fast-jwt/src/crypto.js publicKeyPemMatcher input validation

Summaryinfo

A vulnerability categorized as problematic has been discovered in nearform fast-jwt up to 3.3.1. This vulnerability affects the function publicKeyPemMatcher of the file fast-jwt/src/crypto.js. The manipulation results in input validation. This vulnerability is known as CVE-2023-48223. It is possible to launch the attack remotely. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in nearform fast-jwt up to 3.3.1. Affected is the function publicKeyPemMatcher of the file fast-jwt/src/crypto.js. The manipulation with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on integrity. CVE summarizes:

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.

The weakness was published 11/20/2023. The advisory is shared for download at github.com. This vulnerability is traded as CVE-2023-48223 since 11/13/2023. There are known technical details, but no exploit is available.

Upgrading to version 3.3.2 eliminates this vulnerability.

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Productinfo

Vendor

• nearform

Name

• fast-jwt

Version

• 3.3.0
• 3.3.1

Website

• Product: https://github.com/nearform/fast-jwt/

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