Vulnerability Details : CVE-2021-22696
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.
Vulnerability category: Server-side request forgery (SSRF)
Products affected by CVE-2021-22696
- cpe:2.3:a:apache:cxf:*:*:*:*:*:*:*:*
- cpe:2.3:a:apache:cxf:*:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:business_intelligence:12.2.1.3.0:*:*:*:enterprise:*:*:*
- cpe:2.3:a:oracle:business_intelligence:12.2.1.4.0:*:*:*:enterprise:*:*:*
- cpe:2.3:a:oracle:business_intelligence:5.5.0.0.0:*:*:*:enterprise:*:*:*
- cpe:2.3:a:oracle:business_intelligence:5.9.0.0.0:*:*:*:enterprise:*:*:*
- cpe:2.3:a:oracle:communications_element_manager:8.2.2:*:*:*:*:*:*:*
- Oracle » Communications Session Report ManagerVersions from including (>=) 8.0.0 and up to, including, (<=) 8.2.4.0cpe:2.3:a:oracle:communications_session_report_manager:*:*:*:*:*:*:*:*
- Oracle » Communications Session Route ManagerVersions from including (>=) 8.0.0 and up to, including, (<=) 8.2.4cpe:2.3:a:oracle:communications_session_route_manager:*:*:*:*:*:*:*:*
- Oracle » Communications Diameter Intelligence HubVersions from including (>=) 8.2.0 and up to, including, (<=) 8.2.3cpe:2.3:a:oracle:communications_diameter_intelligence_hub:*:*:*:*:*:*:*:*
- Oracle » Communications Diameter Intelligence HubVersions from including (>=) 8.0.0 and up to, including, (<=) 8.1.0cpe:2.3:a:oracle:communications_diameter_intelligence_hub:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-22696
0.30%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 70 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-22696
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.0
|
MEDIUM | AV:N/AC:L/Au:N/C:N/I:N/A:P |
10.0
|
2.9
|
NIST | |
|
7.5
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
3.9
|
3.6
|
NIST |
CWE ids for CVE-2021-22696
-
The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.Assigned by: security@apache.org (Secondary)
-
The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.Assigned by:
- nvd@nist.gov (Primary)
- security@apache.org (Secondary)
References for CVE-2021-22696
-
https://www.oracle.com/security-alerts/cpuapr2022.html
Oracle Critical Patch Update Advisory - April 2022Patch;Third Party Advisory
-
https://lists.apache.org/thread.html/r8651c06212c56294a1c0ea61a5ad7790c06502209c03f05c0c7c9914@%3Cdev.cxf.apache.org%3E
CVE-2021-22696: OAuth 2 authorization service vulnerable to DDos attacks - Pony MailMailing List;Vendor Advisory
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https://cxf.apache.org/security-advisories.data/CVE-2021-22696.txt.asc
Vendor Advisory
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http://www.openwall.com/lists/oss-security/2021/04/02/2
oss-security - CVE-2021-22696: Apache CXF: OAuth 2 authorization service vulnerable to DDos attacksMailing List;Third Party Advisory
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https://lists.apache.org/thread.html/rec7160382badd3ef4ad017a22f64a266c7188b9ba71394f0d321e2d4@%3Ccommits.cxf.apache.org%3E
svn commit: r1073270 - in /websites/production/cxf/content: cache/main.pageCache security-advisories.data/CVE-2021-22696.txt.asc security-advisories.html - Pony MailMailing List;Vendor Advisory
-
https://lists.apache.org/thread.html/r6445001cc5f9a2bb1e6316993753306e054bdd1d702656b7cbe59045@%3Cannounce.apache.org%3E
[Apache CXF] CVE-2021-22696: OAuth 2 authorization service vulnerable to DDos attacks - Pony MailMailing List;Vendor Advisory
-
https://lists.apache.org/thread.html/rfb87e0bf3995e7d560afeed750fac9329ff5f1ad49da365129b7f89e@%3Ccommits.cxf.apache.org%3E
svn commit: r1075801 - in /websites/production/cxf/content: cache/main.pageCache index.html security-advisories.data/CVE-2021-30468.txt.asc security-advisories.html - Pony MailExploit;Mailing List;Vendor Advisory
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https://www.oracle.com/security-alerts/cpuoct2021.html
Oracle Critical Patch Update Advisory - October 2021Patch;Third Party Advisory
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https://lists.apache.org/thread.html/r8651c06212c56294a1c0ea61a5ad7790c06502209c03f05c0c7c9914@%3Cusers.cxf.apache.org%3E
CVE-2021-22696: OAuth 2 authorization service vulnerable to DDos attacks - Pony MailMailing List;Vendor Advisory
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