CVE-2021-21651: S3 Missing Authorization Vulnerability

MODERATE
Advisory Identifier: GHSA-w5rh-j4g3-jr29
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CVSS 4.3
CWE-862
Published
Advisory Summary

CVE-2021-21651 is a MODERATE (CVSS 4.3) missing authorization vulnerability (CWE-862: Missing Authorization) affecting S3 libraries in the Maven ecosystem. The issue involves missing authorization in jenkins s3 publisher plugin. Remediation is available by upgrading affected packages to version 0.11.7, 0.11.5.1.

CVE-2021-21651 at a Glance

CVE Identifier CVE-2021-21651
GHSA Identifier GHSA-w5rh-j4g3-jr29
Severity MODERATE
CVSS v3.1 Base Score 4.3
CWE Classification CWE-862: Missing Authorization
Affected Product S3
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-2021-21651

To remediate this vulnerability, upgrade all affected S3 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:s3 fixed: 0.11.7 
<dependency>
    <groupId>org.jenkins-ci.plugins</groupId>
    <artifactId>s3</artifactId>
    <version>0.11.7</version>
</dependency>
org.jenkins-ci.plugins:s3 fixed: 0.11.5.1 
<dependency>
    <groupId>org.jenkins-ci.plugins</groupId>
    <artifactId>s3</artifactId>
    <version>0.11.5.1</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-2021-21651, 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 S3 in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.11.7), 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 S3, 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 S3 publisher Plugin prior to 0.11.7 and 0.11.5.1 does not perform a permission check in an HTTP endpoint. This allows attackers with Overall/Read permission to obtain the list of configured profiles. S3 publisher Plugin 0.11.7 and 0.11.5.1 performs permission checks when providing a list of configured profiles.

CVE-2021-21651 Affected S3 Versions

2 component(s)
Fixed Versions:
0.11.70.11.5.1
Product / Package Ecosystem Affected Versions Fixed Version
org.jenkins-ci.plugins:s3
maven/org.jenkins-ci.plugins/s3
Maven
≥ 0.11.6
< 0.11.7
All 1 versions
0.11.6
0.11.7
org.jenkins-ci.plugins:s3
maven/org.jenkins-ci.plugins/s3
Maven
< 0.11.5.1
0.11.5.1

References

NVD — CVE-2021-21651 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-21651
Security Fix Commit FIX COMMIT
https://github.com/jenkinsci/s3-plugin/commit/2e85e45c0e4e7a9231b0317392928e2d19e77368
S3 Source Repository REPOSITORY
https://github.com/CVEProject/cvelist/blob/2d78eb36f4d084db7fb35f1535d8d84fdcb7d859/2021/21xxx/CVE-2021-21651.json
S3 Security Information SECURITY
https://www.jenkins.io/security/advisory/2021-05-11/#SECURITY-2201

Frequently Asked Questions

What is CVE-2021-21651?
CVE-2021-21651 is a security vulnerability in S3 involving Missing Authorization in Jenkins S3 publisher Plugin under CWE-862: Missing Authorization.
Which S3 versions are affected?
Affected versions include releases prior to 0.11.7, 0.11.5.1 across affected packages: org.jenkins-ci.plugins:s3.
What version fixes CVE-2021-21651?
Upgrading to 0.11.7, 0.11.5.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is s3 affected?
Yes, org.jenkins-ci.plugins:s3 is affected in releases prior to 0.11.7, 0.11.5.1. Upgrade your dependency to 0.11.7, 0.11.5.1 or later.
What is the CVSS score of CVE-2021-21651?
CVE-2021-21651 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-2021-21651?
CVE-2021-21651 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-2021-21651?
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-w5rh-j4g3-jr29",
  "modified" : "2023-05-24T14:45:31Z",
  "published" : "2021-06-16T17:29:17Z",
  "aliases" : [ "CVE-2021-21651" ],
  "summary" : "Missing Authorization in Jenkins S3 publisher Plugin",
  "details" : "Jenkins S3 publisher Plugin prior to 0.11.7 and 0.11.5.1 does not perform a permission check in an HTTP endpoint.\n\nThis allows attackers with Overall/Read permission to obtain the list of configured profiles.\n\nS3 publisher Plugin 0.11.7 and 0.11.5.1 performs permission checks when providing a list of configured profiles.",
  "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:s3"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0.11.6"
      }, {
        "fixed" : "0.11.7"
      } ]
    } ],
    "versions" : [ "0.11.6" ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.jenkins-ci.plugins:s3"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.11.5.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-21651"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/jenkinsci/s3-plugin/commit/2e85e45c0e4e7a9231b0317392928e2d19e77368"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/CVEProject/cvelist/blob/2d78eb36f4d084db7fb35f1535d8d84fdcb7d859/2021/21xxx/CVE-2021-21651.json"
  }, {
    "type" : "WEB",
    "url" : "https://www.jenkins.io/security/advisory/2021-05-11/#SECURITY-2201"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-862" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-19T18:59:06Z",
    "nvd_published_at" : "2021-05-11T15:15:00Z"
  }
}