CXF supports (via JwtRequestCodeFilter) passing OAuth 2 parameters via a JWT token as opposed to query parameters (see: The OAuth 2.0 Authorization Framework: JWT Secured Authorization Request (JAR)). Instead of sending a JWT token as a "request" parameter, the spec also supports specifying a URI from which to retrieve a JWT token from via the "requesturi" parameter. CXF was not validating the "requesturi" parameter (apart from ensuring it uses "https) and was making a REST request to the parameter in the request to retrieve a token. This means that CXF was vulnerable to DDos attacks on the authorization server, as specified in section 10.4.1 of the spec. This issue affects Apache CXF versions prior to 3.4.3; Apache CXF versions prior to 3.3.10.
{ "nvd_published_at": "2021-04-02T10:15:00Z", "github_reviewed_at": "2021-04-05T18:02:48Z", "severity": "HIGH", "github_reviewed": true, "cwe_ids": [ "CWE-400", "CWE-918" ] }