CVE-2021-21620: Claim Cross-Site Request Forgery Vulnerability

MODERATE
Advisory Identifier: GHSA-4ffq-6g62-j4v4
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CVSS 4.3
CWE-352
Published
Advisory Summary

CVE-2021-21620 is a MODERATE (CVSS 4.3) cross-site request forgery vulnerability (CWE-352: Cross-Site Request Forgery (CSRF)) affecting Claim libraries in the Maven ecosystem. The issue involves cross-site request forgery in the jenkins claim plugin. Remediation is available by upgrading affected packages to version 2.18.2.

CVE-2021-21620 at a Glance

CVE Identifier CVE-2021-21620
GHSA Identifier GHSA-4ffq-6g62-j4v4
Severity MODERATE
CVSS v3.1 Base Score 4.3
CWE Classification CWE-352: Cross-Site Request Forgery (CSRF)
Affected Product Claim
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 4.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction Required (UI:R)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2021-21620

To remediate this vulnerability, upgrade all affected Claim dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

org.jenkins-ci.plugins:claim fixed: 2.18.2 
<dependency>
    <groupId>org.jenkins-ci.plugins</groupId>
    <artifactId>claim</artifactId>
    <version>2.18.2</version>
</dependency>
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree -Dincludes=org.jenkins-ci.plugins

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2021-21620, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.jenkins-ci.plugins

Analyze the terminal output to locate any version of Claim in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.18.2), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.jenkins-ci.plugins command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-352: Cross-Site Request Forgery (CSRF), where the web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor. In Claim, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

Jenkins Claim Plugin 2.18.1 and earlier does not require POST requests for the form submission endpoint assigning claims, resulting in a cross-site request forgery (CSRF) vulnerability. This vulnerability allows attackers to change claims. Jenkins Claim Plugin 2.18.2 requires POST requests for the affected HTTP endpoint.

CVE-2021-21620 Affected Claim Versions

1 component(s)
Fixed Versions:
2.18.2
Product / Package Ecosystem Affected Versions Fixed Version
org.jenkins-ci.plugins:claim
maven/org.jenkins-ci.plugins/claim
Maven
< 2.18.2
2.18.2

References

NVD — CVE-2021-21620 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-21620
Claim Source Repository REPOSITORY
https://github.com/jenkinsci/claim-plugin
Claim Security Information SECURITY
https://www.jenkins.io/security/advisory/2021-02-24/#SECURITY-2188%20(2)

Frequently Asked Questions

What is CVE-2021-21620?
CVE-2021-21620 is a security vulnerability in Claim involving Cross-Site Request Forgery in the Jenkins Claim plugin under CWE-352: Cross-Site Request Forgery (CSRF).
Which Claim versions are affected?
Affected versions include releases prior to 2.18.2 across affected packages: org.jenkins-ci.plugins:claim.
What version fixes CVE-2021-21620?
Upgrading to 2.18.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is claim affected?
Yes, org.jenkins-ci.plugins:claim is affected in releases prior to 2.18.2. Upgrade your dependency to 2.18.2 or later.
What is the CVSS score of CVE-2021-21620?
CVE-2021-21620 has a CVSS v3.1 base score of 4.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.
What CWE is associated with CVE-2021-21620?
CVE-2021-21620 is classified under CWE-352: Cross-Site Request Forgery (CSRF) (The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.).
How can I check Maven dependencies for CVE-2021-21620?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.jenkins-ci.plugins'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-4ffq-6g62-j4v4",
  "modified" : "2023-10-27T13:36:42Z",
  "published" : "2021-06-16T17:29:43Z",
  "aliases" : [ "CVE-2021-21620" ],
  "summary" : "Cross-Site Request Forgery in the Jenkins Claim plugin",
  "details" : "Jenkins Claim Plugin 2.18.1 and earlier does not require POST requests for the form submission endpoint assigning claims, resulting in a cross-site request forgery (CSRF) vulnerability.\n\nThis vulnerability allows attackers to change claims.\n\nJenkins Claim Plugin 2.18.2 requires POST requests for the affected HTTP endpoint.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.jenkins-ci.plugins:claim"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.18.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-21620"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/jenkinsci/claim-plugin"
  }, {
    "type" : "WEB",
    "url" : "https://www.jenkins.io/security/advisory/2021-02-24/#SECURITY-2188%20(2)"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-352" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-07T18:25:26Z",
    "nvd_published_at" : "2021-02-24T16:15:00Z"
  }
}