CVE-2021-21619: Claim Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-48hr-jg4p-w4p4
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CVSS 5.4
CWE-79
Published
Advisory Summary

CVE-2021-21619 is a MODERATE (CVSS 5.4) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Claim libraries in the Maven ecosystem. The issue involves xss vulnerability in jenkins claim plugin. Remediation is available by upgrading affected packages to version 2.18.2.

CVE-2021-21619 at a Glance

CVE Identifier CVE-2021-21619
GHSA Identifier GHSA-48hr-jg4p-w4p4
Severity MODERATE
CVSS v3.1 Base Score 5.4
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Claim
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 5.4

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

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

How to Fix CVE-2021-21619

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-2021-21619, 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-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), where the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. 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 escape the user display name shown in claims. This results in a stored cross-site scripting (XSS) vulnerability exploitable by attackers who are able to control the display names of Jenkins users, either via the security realm, or directly inside Jenkins. Everyone with a Jenkins account can change their own display name.\n\nClaim Plugin 2.18.2 escapes the user display name shown in claims.

CVE-2021-21619 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-2021-21619 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-21619
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(1)
Claim Security Information SECURITY
http://www.openwall.com/lists/oss-security/2021/02/24/3

Frequently Asked Questions

What is CVE-2021-21619?
CVE-2021-21619 is a security vulnerability in Claim involving XSS vulnerability in Jenkins Claim Plugin under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
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-2021-21619?
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-2021-21619?
CVE-2021-21619 has a CVSS v3.1 base score of 5.4 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2021-21619?
CVE-2021-21619 is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.).
How can I check Maven dependencies for CVE-2021-21619?
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-48hr-jg4p-w4p4",
  "modified" : "2023-10-27T13:39:47Z",
  "published" : "2022-05-24T17:43:01Z",
  "aliases" : [ "CVE-2021-21619" ],
  "summary" : "XSS vulnerability in Jenkins Claim Plugin",
  "details" : "Jenkins Claim Plugin 2.18.1 and earlier does not escape the user display name shown in claims.\n\nThis results in a stored cross-site scripting (XSS) vulnerability exploitable by attackers who are able to control the display names of Jenkins users, either via the security realm, or directly inside Jenkins.\n\nEveryone with a Jenkins account can change their own display name.\\n\\nClaim Plugin 2.18.2 escapes the user display name shown in claims.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.jenkins-ci.plugins:claim"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.18.2"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 2.18.1"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-21619"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/jenkinsci/claim-plugin"
  }, {
    "type" : "WEB",
    "url" : "https://www.jenkins.io/security/advisory/2021-02-24/#SECURITY-2188%20(1)"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2021/02/24/3"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-12-13T18:55:52Z",
    "nvd_published_at" : "2021-02-24T16:15:00Z"
  }
}