CVE-2021-21645: Config file provider Missing Permission Checks Vulnerability

MODERATE
Advisory Identifier: GHSA-2959-fj73-hm8p
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CVSS 4.3
CWE-862
Published
Advisory Summary

CVE-2021-21645 is a MODERATE (CVSS 4.3) missing permission checks vulnerability (CWE-862: Missing Authorization) affecting Config file provider libraries in the Maven ecosystem. The issue involves missing permission checks in jenkins config file provider plugin allow enumerating configuration file ids. Remediation is available by upgrading affected packages to version 3.7.1.

CVE-2021-21645 at a Glance

CVE Identifier CVE-2021-21645
GHSA Identifier GHSA-2959-fj73-hm8p
Severity MODERATE
CVSS v3.1 Base Score 4.3
CWE Classification CWE-862: Missing Authorization
Affected Product Config file provider
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:L/I:N/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 Low (C:L)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2021-21645

To remediate this vulnerability, upgrade all affected Config file provider 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:config-file-provider fixed: 3.7.1 
<dependency>
    <groupId>org.jenkins-ci.plugins</groupId>
    <artifactId>config-file-provider</artifactId>
    <version>3.7.1</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-2021-21645, 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 Config file provider in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.7.1), 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-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 Config file provider, 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 Config File Provider Plugin 3.7.0 and earlier does not perform permission checks in several HTTP endpoints. This allows attackers with Overall/Read permission to enumerate configuration file IDs. An enumeration of configuration file IDs in Jenkins Config File Provider Plugin 3.7.1 requires the appropriate permissions.

CVE-2021-21645 Affected Config file provider Versions

1 component(s)
Fixed Versions:
3.7.1
Product / Package Ecosystem Affected Versions Fixed Version
org.jenkins-ci.plugins:config-file-provider
maven/org.jenkins-ci.plugins/config-file-provider
Maven
< 3.7.1
3.7.1

References

NVD — CVE-2021-21645 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-21645
Security Fix Commit FIX COMMIT
https://github.com/jenkinsci/config-file-provider-plugin/commit/b7f3c5150ad557e86414122c69be20075aee27fa
Config file provider Source Repository REPOSITORY
https://github.com/jenkinsci/config-file-provider-plugin
Config file provider Security Information SECURITY
https://www.jenkins.io/security/advisory/2021-04-21/#SECURITY-2203
Config file provider Security Information SECURITY
http://www.openwall.com/lists/oss-security/2021/04/21/2

Frequently Asked Questions

What is CVE-2021-21645?
CVE-2021-21645 is a security vulnerability in Config file provider involving Missing permission checks in Jenkins Config File Provider Plugin allow enumerating configuration file IDs under CWE-862: Missing Authorization.
Which Config file provider versions are affected?
Affected versions include releases prior to 3.7.1 across affected packages: org.jenkins-ci.plugins:config-file-provider.
What version fixes CVE-2021-21645?
Upgrading to 3.7.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is config-file-provider affected?
Yes, org.jenkins-ci.plugins:config-file-provider is affected in releases prior to 3.7.1. Upgrade your dependency to 3.7.1 or later.
What is the CVSS score of CVE-2021-21645?
CVE-2021-21645 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:L/I:N/A:N.
What CWE is associated with CVE-2021-21645?
CVE-2021-21645 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-2021-21645?
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-2959-fj73-hm8p",
  "modified" : "2023-10-27T14:28:15Z",
  "published" : "2022-05-24T17:48:06Z",
  "aliases" : [ "CVE-2021-21645" ],
  "summary" : "Missing permission checks in Jenkins Config File Provider Plugin allow enumerating configuration file IDs",
  "details" : "Jenkins Config File Provider Plugin 3.7.0 and earlier does not perform permission checks in several HTTP endpoints.\n\nThis allows attackers with Overall/Read permission to enumerate configuration file IDs.\n\nAn enumeration of configuration file IDs in Jenkins Config File Provider Plugin 3.7.1 requires the appropriate permissions.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.jenkins-ci.plugins:config-file-provider"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.7.1"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 3.7.0"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-21645"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/jenkinsci/config-file-provider-plugin/commit/b7f3c5150ad557e86414122c69be20075aee27fa"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/jenkinsci/config-file-provider-plugin"
  }, {
    "type" : "WEB",
    "url" : "https://www.jenkins.io/security/advisory/2021-04-21/#SECURITY-2203"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2021/04/21/2"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-862" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-12-13T19:26:47Z",
    "nvd_published_at" : "2021-04-21T15:15:00Z"
  }
}