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.
[
{
"product": "Apache CXF",
"vendor": "Apache Software Foundation",
"versions": [
{
"lessThan": "3.4.3",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
},
{
"lessThan": "3.3.10",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
}
]
}
]
www.openwall.com/lists/oss-security/2021/04/02/2
cxf.apache.org/security-advisories.data/CVE-2021-22696.txt.asc
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