CVE-2021-21679: Azure ad Jenkins Azure AD Plugin Allows Vulnerability

HIGH
Advisory Identifier: GHSA-x77r-7m5w-pqq2
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CVSS 8.8
CWE-693 CWE-352
Published
Advisory Summary

CVE-2021-21679 is a HIGH (CVSS 8.8) jenkins azure ad plugin allows vulnerability (CWE-693: Protection Mechanism Failure) affecting Azure ad libraries in the Maven ecosystem. The issue involves jenkins azure ad plugin allows bypassing csrf protection for any url. Remediation is available by upgrading affected packages to version 180.v8b1e80e6f242.

CVE-2021-21679 at a Glance

CVE Identifier CVE-2021-21679
GHSA Identifier GHSA-x77r-7m5w-pqq2
Severity HIGH
CVSS v3.1 Base Score 8.8
CWE Classification CWE-693: Protection Mechanism Failure
Affected Product Azure ad
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 8.8

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:H/I:H/A:H).

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 High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2021-21679

To remediate this vulnerability, upgrade all affected Azure ad 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:azure-ad fixed: 180.v8b1e80e6f242 
<dependency>
    <groupId>org.jenkins-ci.plugins</groupId>
    <artifactId>azure-ad</artifactId>
    <version>180.v8b1e80e6f242</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-2021-21679, 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 Azure ad in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 180.v8b1e80e6f242), 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-693: Protection Mechanism Failure, where the product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product. In Azure ad, 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

An extension point in Jenkins allows selectively disabling cross-site request forgery (CSRF) protection for specific URLs. Jenkins Azure AD Plugin implements this extension point for URLs used by a JavaScript component. In Jenkins Azure AD Plugin 179.vf6841393099e and earlier this implementation is too permissive, allowing attackers to craft URLs that would bypass the CSRF protection of any target URL. This vulnerability was originally introduced in Azure AD Plugin 164.v5b48baa961d2. Azure AD Plugin 180.v8b1e80e6f242 no longer allows bypassing CSRF protection for URLs used by the JavaScript component. Instead, that component was reconfigured to pass the expected CSRF token.

CVE-2021-21679 Affected Azure ad Versions

1 component(s)
Fixed Versions:
180.v8b1e80e6f242
Product / Package Ecosystem Affected Versions Fixed Version
org.jenkins-ci.plugins:azure-ad
maven/org.jenkins-ci.plugins/azure-ad
Maven
< 180.v8b1e80e6f242
180.v8b1e80e6f242

References

NVD — CVE-2021-21679 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-21679
Security Fix Commit FIX COMMIT
https://github.com/jenkinsci/azure-ad-plugin/commit/8b1e80e6f242275127ebb177e2a755a2104b4853
Azure ad Source Repository REPOSITORY
https://github.com/jenkinsci/azure-ad-plugin
Azure ad Security Information SECURITY
https://www.jenkins.io/security/advisory/2021-08-31/#SECURITY-2470
Azure ad Security Information SECURITY
http://www.openwall.com/lists/oss-security/2021/08/31/1

Frequently Asked Questions

What is CVE-2021-21679?
CVE-2021-21679 is a security vulnerability in Azure ad involving Jenkins Azure AD Plugin allows bypassing CSRF protection for any URL under CWE-693: Protection Mechanism Failure.
Which Azure ad versions are affected?
Affected versions include releases prior to 180.v8b1e80e6f242 across affected packages: org.jenkins-ci.plugins:azure-ad.
What version fixes CVE-2021-21679?
Upgrading to 180.v8b1e80e6f242 (or the latest patched release for your respective branch) resolves the vulnerability.
Is azure-ad affected?
Yes, org.jenkins-ci.plugins:azure-ad is affected in releases prior to 180.v8b1e80e6f242. Upgrade your dependency to 180.v8b1e80e6f242 or later.
What is the CVSS score of CVE-2021-21679?
CVE-2021-21679 has a CVSS v3.1 base score of 8.8 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2021-21679?
CVE-2021-21679 is classified under CWE-693: Protection Mechanism Failure (The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.).
How can I check Maven dependencies for CVE-2021-21679?
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-x77r-7m5w-pqq2",
  "modified" : "2023-10-27T16:04:06Z",
  "published" : "2022-05-24T19:12:36Z",
  "aliases" : [ "CVE-2021-21679" ],
  "summary" : "Jenkins Azure AD Plugin allows bypassing CSRF protection for any URL",
  "details" : "An extension point in Jenkins allows selectively disabling cross-site request forgery (CSRF) protection for specific URLs. Jenkins Azure AD Plugin implements this extension point for URLs used by a JavaScript component.\n\nIn Jenkins Azure AD Plugin 179.vf6841393099e and earlier this implementation is too permissive, allowing attackers to craft URLs that would bypass the CSRF protection of any target URL.\n\nThis vulnerability was originally introduced in Azure AD Plugin 164.v5b48baa961d2.\n\nAzure AD Plugin 180.v8b1e80e6f242 no longer allows bypassing CSRF protection for URLs used by the JavaScript component. Instead, that component was reconfigured to pass the expected CSRF token.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.jenkins-ci.plugins:azure-ad"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "180.v8b1e80e6f242"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 179.vf6841393099e"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-21679"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/jenkinsci/azure-ad-plugin/commit/8b1e80e6f242275127ebb177e2a755a2104b4853"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/jenkinsci/azure-ad-plugin"
  }, {
    "type" : "WEB",
    "url" : "https://www.jenkins.io/security/advisory/2021-08-31/#SECURITY-2470"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2021/08/31/1"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-352", "CWE-693" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-12-15T16:31:38Z",
    "nvd_published_at" : "2021-08-31T14:15:00Z"
  }
}