CVE-2021-21626: Warnings ng Missing Permission Checks Vulnerability

MODERATE
Advisory Identifier: GHSA-7j3x-xm4j-jfj7
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CVSS 4.3
CWE-862
Published
Advisory Summary

CVE-2021-21626 is a MODERATE (CVSS 4.3) missing permission checks vulnerability (CWE-862: Missing Authorization) affecting Warnings ng libraries in the Maven ecosystem. The issue involves missing permission checks in jenkins warnings next generation plugin allow listing workspace contents. Remediation is available by upgrading affected packages to version 8.5.0.

CVE-2021-21626 at a Glance

CVE Identifier CVE-2021-21626
GHSA Identifier GHSA-7j3x-xm4j-jfj7
Severity MODERATE
CVSS v3.1 Base Score 4.3
CWE Classification CWE-862: Missing Authorization
Affected Product Warnings ng
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:L/UI:N/S:U/C:N/I:L/A:N).

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

How to Fix CVE-2021-21626

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

io.jenkins.plugins:warnings-ng fixed: 8.5.0 
<dependency>
    <groupId>io.jenkins.plugins</groupId>
    <artifactId>warnings-ng</artifactId>
    <version>8.5.0</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=io.jenkins.plugins

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2021-21626, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=io.jenkins.plugins

Analyze the terminal output to locate any version of Warnings ng in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 8.5.0), your application is affected.

Note: The mvn dependency:tree -Dincludes=io.jenkins.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-862: Missing Authorization, where the product does not perform an authorization check when an actor attempts to access a resource or perform an action. In Warnings ng, 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 Warnings Next Generation Plugin 8.4.4 and earlier does not perform permission checks in methods implementing form validation. This allows attackers with Item/Read permission but without Item/Workspace or Item/Configure permission to check whether attacker-specified file patterns match workspace contents. A sequence of requests can be used to effectively list workspace contents. Jenkins Warnings Next Generation Plugin 8.5.0 requires Item/Configure permission to validate patterns with workspace contents.

CVE-2021-21626 Affected Warnings ng Versions

1 component(s)
Fixed Versions:
8.5.0
Product / Package Ecosystem Affected Versions Fixed Version
io.jenkins.plugins:warnings-ng
maven/io.jenkins.plugins/warnings-ng
Maven
< 8.5.0
8.5.0

References

NVD — CVE-2021-21626 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-21626
Warnings ng Source Repository REPOSITORY
https://github.com/jenkinsci/warnings-ng-plugin
Warnings ng Security Information SECURITY
https://www.jenkins.io/security/advisory/2021-03-18/#SECURITY-2041
Warnings ng Security Information SECURITY
http://www.openwall.com/lists/oss-security/2021/03/18/5

Frequently Asked Questions

What is CVE-2021-21626?
CVE-2021-21626 is a security vulnerability in Warnings ng involving Missing permission checks in Jenkins Warnings Next Generation Plugin allow listing workspace contents under CWE-862: Missing Authorization.
Which Warnings ng versions are affected?
Affected versions include releases prior to 8.5.0 across affected packages: io.jenkins.plugins:warnings-ng.
What version fixes CVE-2021-21626?
Upgrading to 8.5.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is warnings-ng affected?
Yes, io.jenkins.plugins:warnings-ng is affected in releases prior to 8.5.0. Upgrade your dependency to 8.5.0 or later.
What is the CVSS score of CVE-2021-21626?
CVE-2021-21626 has a CVSS v3.1 base score of 4.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.
What CWE is associated with CVE-2021-21626?
CVE-2021-21626 is classified under CWE-862: Missing Authorization (The product does not perform an authorization check when an actor attempts to access a resource or perform an action.).
How can I check Maven dependencies for CVE-2021-21626?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=io.jenkins.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-7j3x-xm4j-jfj7",
  "modified" : "2023-10-27T13:54:28Z",
  "published" : "2022-05-24T17:44:48Z",
  "aliases" : [ "CVE-2021-21626" ],
  "summary" : "Missing permission checks in Jenkins Warnings Next Generation Plugin allow listing workspace contents",
  "details" : "Jenkins Warnings Next Generation Plugin 8.4.4 and earlier does not perform permission checks in methods implementing form validation.\n\nThis allows attackers with Item/Read permission but without Item/Workspace or Item/Configure permission to check whether attacker-specified file patterns match workspace contents. A sequence of requests can be used to effectively list workspace contents.\n\nJenkins Warnings Next Generation Plugin 8.5.0 requires Item/Configure permission to validate patterns with workspace contents.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "io.jenkins.plugins:warnings-ng"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "8.5.0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 8.4.4"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-21626"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/jenkinsci/warnings-ng-plugin"
  }, {
    "type" : "WEB",
    "url" : "https://www.jenkins.io/security/advisory/2021-03-18/#SECURITY-2041"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2021/03/18/5"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-862" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-12-14T16:24:01Z",
    "nvd_published_at" : "2021-03-18T14:15:00Z"
  }
}