joaquimserafim/json-web-token is a javascript library use to interact with JSON Web Tokens (JWT) which are a compact URL-safe means of representing claims to be transferred between two parties. Affected versions of the json-web-token library are vulnerable to a JWT algorithm confusion attack. On line 86 of the 'index.js' file, the algorithm to use for verifying the signature of the JWT token is taken from the JWT token, which at that point is still unverified and thus shouldn't be trusted. 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 against this library is the RS256 algorithm is in use, however it is a best practice to use that algorithm.

joaquimserafim/json-web-token is a javascript library use to interact with JSON Web Tokens (JWT) which are a compact URL-safe means of representing claims to be transferred between two parties. Versions prior to 4.0.0 are vulnerable to a JWT algorithm confusion attack. On line 86 of the 'index.js' file, the algorithm to use for verifying the signature of the JWT token is taken from the JWT token, which at that point is still unverified and thus shouldn't be trusted. 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 against this library is the RS256 algorithm is in use, however it is a best practice to use that algorithm. Version 4.0.0 fixes the issue.

https://github.com/joaquimserafim/json-web-token/commit/b6e56b1346f48432d29133c76b65222ad93956b7

https://github.com/joaquimserafim/json-web-token/security/advisories/GHSA-4xw9-cx39-r355

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

OR
     *cpe:2.3:a:joaquimserafim:json_web_token:*:*:*:*:*:node.js:*:* versions up to (excluding) 3.1.1

https://github.com/joaquimserafim/json-web-token/security/advisories/GHSA-4xw9-cx39-r355 No Types Assigned

https://github.com/joaquimserafim/json-web-token/security/advisories/GHSA-4xw9-cx39-r355 Exploit, Vendor Advisory

joaquimserafim/json-web-token is a javascript library use to interact with JSON Web Tokens (JWT) which are a compact URL-safe means of representing claims to be transferred between two parties. Affected versions of the json-web-token library are vulnerable to a JWT algorithm confusion attack. On line 86 of the 'index.js' file, the algorithm to use for verifying the signature of the JWT token is taken from the JWT token, which at that point is still unverified and thus shouldn't be trusted. 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 against this library is the RS256 algorithm is in use, however it is a best practice to use that algorithm.

GitHub, Inc. AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

GitHub, Inc. CWE-345

GitHub, Inc. https://github.com/joaquimserafim/json-web-token/security/advisories/GHSA-4xw9-cx39-r355 [No types assigned]