CVE-2023-37942: External monitor job Jenkins External Monitor Job Type Vulnerability

MODERATE
Advisory Identifier: GHSA-g4c3-4f3v-84x8
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CVSS 6.5
CWE-611
Published
Advisory Summary

CVE-2023-37942 is a MODERATE (CVSS 6.5) jenkins external monitor job type vulnerability (CWE-611: Improper Restriction of XML External Entity Reference) affecting External monitor job libraries in the Maven ecosystem. The issue involves jenkins external monitor job type plugin xml external entity vulnerability. Remediation is available by upgrading affected packages to version 207.v98a.

CVE-2023-37942 at a Glance

CVE Identifier CVE-2023-37942
GHSA Identifier GHSA-g4c3-4f3v-84x8
Severity MODERATE
CVSS v3.1 Base Score 6.5
CWE Classification CWE-611: Improper Restriction of XML External Entity Reference
Affected Product External monitor job
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:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/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 None (C:N)
Integrity High (I:H)
Availability None (A:N)

How to Fix CVE-2023-37942

To remediate this vulnerability, upgrade all affected External monitor job 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:external-monitor-job fixed: 207.v98a 
<dependency>
    <groupId>org.jenkins-ci.plugins</groupId>
    <artifactId>external-monitor-job</artifactId>
    <version>207.v98a</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-2023-37942, 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 External monitor job in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 207.v98a), 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-611: Improper Restriction of XML External Entity Reference, where the product processes an xml document that can contain xml entities with uris that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output. In External monitor job, 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 External Monitor Job Type Plugin 206.v9a_94ff0b_4a_10 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks. This allows attackers with Item/Build permission to have Jenkins parse a crafted HTTP request with XML data that uses external entities for extraction of secrets from the Jenkins controller or server-side request forgery. External Monitor Job Type Plugin 207.v98a_a_37a_85525 disables external entity resolution for its XML parser.

CVE-2023-37942 Affected External monitor job Versions

1 component(s)
Fixed Versions:
207.v98a
Product / Package Ecosystem Affected Versions Fixed Version
org.jenkins-ci.plugins:external-monitor-job
maven/org.jenkins-ci.plugins/external-monitor-job
Maven
< 207.v98a
207.v98a

References

NVD — CVE-2023-37942 NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-37942
External monitor job Security Information SECURITY
https://www.jenkins.io/security/advisory/2023-07-12/#SECURITY-3133
External monitor job Security Information SECURITY
http://www.openwall.com/lists/oss-security/2023/07/12/2

Frequently Asked Questions

What is CVE-2023-37942?
CVE-2023-37942 is a security vulnerability in External monitor job involving Jenkins External Monitor Job Type Plugin XML external entity vulnerability under CWE-611: Improper Restriction of XML External Entity Reference.
Which External monitor job versions are affected?
Affected versions include releases prior to 207.v98a across affected packages: org.jenkins-ci.plugins:external-monitor-job.
What version fixes CVE-2023-37942?
Upgrading to 207.v98a (or the latest patched release for your respective branch) resolves the vulnerability.
Is external-monitor-job affected?
Yes, org.jenkins-ci.plugins:external-monitor-job is affected in releases prior to 207.v98a. Upgrade your dependency to 207.v98a or later.
What is the CVSS score of CVE-2023-37942?
CVE-2023-37942 has a CVSS v3.1 base score of 6.5 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.
What CWE is associated with CVE-2023-37942?
CVE-2023-37942 is classified under CWE-611: Improper Restriction of XML External Entity Reference (The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.).
How can I check Maven dependencies for CVE-2023-37942?
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-g4c3-4f3v-84x8",
  "modified" : "2023-07-20T14:15:36Z",
  "published" : "2023-07-12T18:30:38Z",
  "aliases" : [ "CVE-2023-37942" ],
  "summary" : "Jenkins External Monitor Job Type Plugin XML external entity vulnerability",
  "details" : "Jenkins External Monitor Job Type Plugin 206.v9a_94ff0b_4a_10 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks.\n\nThis allows attackers with Item/Build permission to have Jenkins parse a crafted HTTP request with XML data that uses external entities for extraction of secrets from the Jenkins controller or server-side request forgery.\n\nExternal Monitor Job Type Plugin 207.v98a_a_37a_85525 disables external entity resolution for its XML parser.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.jenkins-ci.plugins:external-monitor-job"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "207.v98a"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-37942"
  }, {
    "type" : "WEB",
    "url" : "https://www.jenkins.io/security/advisory/2023-07-12/#SECURITY-3133"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2023/07/12/2"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-611" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-07-12T19:49:45Z",
    "nvd_published_at" : "2023-07-12T16:15:13Z"
  }
}