CVE-2020-2323: Chaos monkey Missing Permission Checks Vulnerability

MODERATE
Advisory Identifier: GHSA-hx53-635r-vmv8
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CVSS 5.3
CWE-862
Published
Advisory Summary

CVE-2020-2323 is a MODERATE (CVSS 5.3) missing permission checks vulnerability (CWE-862: Missing Authorization) affecting Chaos monkey libraries in the Maven ecosystem. The issue involves missing permission checks in jenkins chaos monkey plugin. Remediation is available by upgrading affected packages to version 0.4.1.

CVE-2020-2323 at a Glance

CVE Identifier CVE-2020-2323
GHSA Identifier GHSA-hx53-635r-vmv8
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-862: Missing Authorization
Affected Product Chaos monkey
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 5.3

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:N/S:U/C:L/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
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-2020-2323

To remediate this vulnerability, upgrade all affected Chaos monkey 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:chaos-monkey fixed: 0.4.1 
<dependency>
    <groupId>io.jenkins.plugins</groupId>
    <artifactId>chaos-monkey</artifactId>
    <version>0.4.1</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=io.jenkins.plugins

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2020-2323, 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 Chaos monkey in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.4.1), 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 Chaos monkey, 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 Chaos Monkey Plugin 0.4 and earlier does not perform permission checks in an HTTP endpoint. This allows attackers with Overall/Read permission to access the Chaos Monkey page and to see the history of actions. Jenkins Chaos Monkey Plugin 0.4.1 requires Overall/Administer permission to access the Chaos Monkey page and to see the history of actions.

CVE-2020-2323 Affected Chaos monkey Versions

1 component(s)
Fixed Versions:
0.4.1
Product / Package Ecosystem Affected Versions Fixed Version
io.jenkins.plugins:chaos-monkey
maven/io.jenkins.plugins/chaos-monkey
Maven
< 0.4.1
0.4.1

References

NVD — CVE-2020-2323 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-2323
Chaos monkey Source Repository REPOSITORY
https://github.com/jenkinsci/chaos-monkey-plugin
Chaos monkey Security Information SECURITY
https://www.jenkins.io/security/advisory/2020-12-03/#SECURITY-2109%20(2)
Chaos monkey Security Information SECURITY
http://www.openwall.com/lists/oss-security/2020/12/03/2

Frequently Asked Questions

What is CVE-2020-2323?
CVE-2020-2323 is a security vulnerability in Chaos monkey involving Missing permission checks in Jenkins Chaos Monkey Plugin under CWE-862: Missing Authorization.
Which Chaos monkey versions are affected?
Affected versions include releases prior to 0.4.1 across affected packages: io.jenkins.plugins:chaos-monkey.
What version fixes CVE-2020-2323?
Upgrading to 0.4.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is chaos-monkey affected?
Yes, io.jenkins.plugins:chaos-monkey is affected in releases prior to 0.4.1. Upgrade your dependency to 0.4.1 or later.
What is the CVSS score of CVE-2020-2323?
CVE-2020-2323 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
What CWE is associated with CVE-2020-2323?
CVE-2020-2323 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-2020-2323?
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-hx53-635r-vmv8",
  "modified" : "2023-10-27T13:15:45Z",
  "published" : "2022-05-24T17:35:09Z",
  "aliases" : [ "CVE-2020-2323" ],
  "summary" : "Missing permission checks in Jenkins Chaos Monkey Plugin",
  "details" : "Jenkins Chaos Monkey Plugin 0.4 and earlier does not perform permission checks in an HTTP endpoint.\n\nThis allows attackers with Overall/Read permission to access the Chaos Monkey page and to see the history of actions.\n\nJenkins Chaos Monkey Plugin 0.4.1 requires Overall/Administer permission to access the Chaos Monkey page and to see the history of actions.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "io.jenkins.plugins:chaos-monkey"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.4.1"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 0.4"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-2323"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/jenkinsci/chaos-monkey-plugin"
  }, {
    "type" : "WEB",
    "url" : "https://www.jenkins.io/security/advisory/2020-12-03/#SECURITY-2109%20(2)"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2020/12/03/2"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-862" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-12-16T22:20:54Z",
    "nvd_published_at" : "2020-12-03T16:15:00Z"
  }
}