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.
Advisories
Source ID Title
EUVD EUVD EUVD-2021-1003 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.
Github GHSA Github GHSA GHSA-7q4h-pj78-j7vg Authorization service vulnerable to DDos attacks in Apache CFX
Fixes

Solution

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Workaround

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cve-icon MITRE

Status: PUBLISHED

Assigner: apache

Published:

Updated: 2025-02-13T16:27:45.767Z

Reserved: 2021-01-06T00:00:00.000Z

Link: CVE-2021-22696

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2021-04-02T10:15:12.200

Modified: 2024-11-21T05:50:28.830

Link: CVE-2021-22696

cve-icon Redhat

Severity : Moderate

Publid Date: 2021-04-02T00:00:00Z

Links: CVE-2021-22696 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses