CVE-2018-1000408: Jenkins core Improper Authorization Vulnerability

MODERATE
Advisory Identifier: GHSA-4h47-h3cr-23wh
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CVSS 6.5
CWE-285
Published
Advisory Summary

CVE-2018-1000408 is a MODERATE (CVSS 6.5) improper authorization vulnerability (CWE-285: Improper Authorization) affecting Jenkins core libraries in the Maven ecosystem. The issue involves improper authorization in jenkins. Remediation is available by upgrading affected packages to version 2.138.2, 2.146.

CVE-2018-1000408 at a Glance

CVE Identifier CVE-2018-1000408
GHSA Identifier GHSA-4h47-h3cr-23wh
Severity MODERATE
CVSS v3.1 Base Score 6.5
CWE Classification CWE-285: Improper Authorization
Affected Product Jenkins core
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 6.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L).

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 None (C:N)
Integrity Low (I:L)
Availability Low (A:L)

How to Fix CVE-2018-1000408

To remediate this vulnerability, upgrade all affected Jenkins core 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.main:jenkins-core fixed: 2.138.2 
<dependency>
    <groupId>org.jenkins-ci.main</groupId>
    <artifactId>jenkins-core</artifactId>
    <version>2.138.2</version>
</dependency>
org.jenkins-ci.main:jenkins-core fixed: 2.146 
<dependency>
    <groupId>org.jenkins-ci.main</groupId>
    <artifactId>jenkins-core</artifactId>
    <version>2.146</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.main

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2018-1000408, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.jenkins-ci.main

Analyze the terminal output to locate any version of Jenkins core in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.138.2), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.jenkins-ci.main 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-285: Improper Authorization, where the product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. In Jenkins core, 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

A denial of service vulnerability exists in Jenkins 2.145 and earlier, LTS 2.138.1 and earlier in core/src/main/java/hudson/security/HudsonPrivateSecurityRealm.java that allows attackers without Overall/Read permission to access a specific URL on instances using the built-in Jenkins user database security realm that results in the creation of an ephemeral user record in memory.

CVE-2018-1000408 Affected Jenkins core Versions

2 component(s)
Fixed Versions:
2.138.22.146
Product / Package Ecosystem Affected Versions Fixed Version
org.jenkins-ci.main:jenkins-core
maven/org.jenkins-ci.main/jenkins-core
Maven
< 2.138.2
2.138.2
org.jenkins-ci.main:jenkins-core
maven/org.jenkins-ci.main/jenkins-core
Maven
≥ 2.140
< 2.146
2.146

References

NVD — CVE-2018-1000408 NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-1000408
Security Fix Commit FIX COMMIT
https://github.com/jenkinsci/jenkins/commit/01157a699f611ca7492e872103ac01526a982cf2
Jenkins core Source Repository REPOSITORY
https://github.com/jenkinsci/jenkins
Jenkins core Security Information SECURITY
https://jenkins.io/security/advisory/2018-10-10/#SECURITY-1128
Jenkins core Security Information SECURITY
http://www.securityfocus.com/bid/106532

Frequently Asked Questions

What is CVE-2018-1000408?
CVE-2018-1000408 is a security vulnerability in Jenkins core involving Improper Authorization in Jenkins under CWE-285: Improper Authorization.
Which Jenkins core versions are affected?
Affected versions include releases prior to 2.138.2, 2.146 across affected packages: org.jenkins-ci.main:jenkins-core.
What version fixes CVE-2018-1000408?
Upgrading to 2.138.2, 2.146 (or the latest patched release for your respective branch) resolves the vulnerability.
Is jenkins-core affected?
Yes, org.jenkins-ci.main:jenkins-core is affected in releases prior to 2.138.2, 2.146. Upgrade your dependency to 2.138.2, 2.146 or later.
What is the CVSS score of CVE-2018-1000408?
CVE-2018-1000408 has a CVSS v3.1 base score of 6.5 (MODERATE) with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L.
What CWE is associated with CVE-2018-1000408?
CVE-2018-1000408 is classified under CWE-285: Improper Authorization (The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action.).
How can I check Maven dependencies for CVE-2018-1000408?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.jenkins-ci.main'. 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-4h47-h3cr-23wh",
  "modified" : "2022-06-30T17:20:23Z",
  "published" : "2022-05-13T01:48:36Z",
  "aliases" : [ "CVE-2018-1000408" ],
  "summary" : "Improper Authorization in Jenkins",
  "details" : "A denial of service vulnerability exists in Jenkins 2.145 and earlier, LTS 2.138.1 and earlier in core/src/main/java/hudson/security/HudsonPrivateSecurityRealm.java that allows attackers without Overall/Read permission to access a specific URL on instances using the built-in Jenkins user database security realm that results in the creation of an ephemeral user record in memory.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.jenkins-ci.main:jenkins-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.138.2"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 2.138.1"
    }
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.jenkins-ci.main:jenkins-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.140"
      }, {
        "fixed" : "2.146"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 2.145"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2018-1000408"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/jenkinsci/jenkins/commit/01157a699f611ca7492e872103ac01526a982cf2"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/jenkinsci/jenkins"
  }, {
    "type" : "WEB",
    "url" : "https://jenkins.io/security/advisory/2018-10-10/#SECURITY-1128"
  }, {
    "type" : "WEB",
    "url" : "http://www.securityfocus.com/bid/106532"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-285" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-06-30T17:20:23Z",
    "nvd_published_at" : "2019-01-09T23:29:00Z"
  }
}