Aug 24, 2021 7:44 am EDT
Categorized: High Severity
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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 “request_uri” parameter. CXF was not validating the “request_uri” 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.
Affected product(s) and affected version(s):
Refer to the following reference URLs for remediation and additional vulnerability details:
Source Bulletin: https://www.ibm.com/support/pages/node/6483061
X-Force Database: https://exchange.xforce.ibmcloud.com/vulnerabilities/199335