CVE-2023-30521: Assembla merge request builder Jenkins Assembla Merge Request Builder Vulnerability

MODERATE
Advisory Identifier: GHSA-jr86-6j4j-mv45
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CVSS 5.3
CWE-862
Published
Advisory Summary

CVE-2023-30521 is a MODERATE (CVSS 5.3) jenkins assembla merge request builder vulnerability (CWE-862: Missing Authorization) affecting Assembla merge request builder libraries in the Maven ecosystem. The issue involves jenkins assembla merge request builder plugin missing authentication to access endpoint. Remediation is available in the latest vendor maintenance releases.

CVE-2023-30521 at a Glance

CVE Identifier CVE-2023-30521
GHSA Identifier GHSA-jr86-6j4j-mv45
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-862: Missing Authorization
Affected Product Assembla merge request builder
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:N/I:L/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 None (C:N)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2023-30521

To remediate this vulnerability, upgrade all affected Assembla merge request builder 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:assembla-merge-request-builder fixed: Latest secure release 
<dependency>
    <groupId>org.jenkins-ci.plugins</groupId>
    <artifactId>assembla-merge-request-builder</artifactId>
    <version>Latest secure release</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-2023-30521, 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 Assembla merge request builder in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), 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 Assembla merge request builder, 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 Assembla merge request builder Plugin provides a webhook endpoint at `/assembla-webhook/` that can be used to trigger builds of jobs configured to use a specified repository. In Assembla merge request builder Plugin 1.1.13 and earlier, this endpoint can be accessed without authentication. This allows unauthenticated attackers to trigger builds of jobs corresponding to the attacker-specified repository.

CVE-2023-30521 Affected Assembla merge request builder Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
org.jenkins-ci.plugins:assembla-merge-request-builder
maven/org.jenkins-ci.plugins/assembla-merge-request-builder
Maven
≤ 1.1.13

References

NVD — CVE-2023-30521 NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-30521
Assembla merge request builder Security Information SECURITY
https://www.jenkins.io/security/advisory/2023-04-12/#SECURITY-2872
Assembla merge request builder Security Information SECURITY
http://www.openwall.com/lists/oss-security/2023/04/13/3

Frequently Asked Questions

What is CVE-2023-30521?
CVE-2023-30521 is a security vulnerability in Assembla merge request builder involving Jenkins Assembla merge request builder Plugin missing authentication to access endpoint under CWE-862: Missing Authorization.
Which Assembla merge request builder versions are affected?
Affected versions include releases prior to current release patches across affected packages: org.jenkins-ci.plugins:assembla-merge-request-builder.
What version fixes CVE-2023-30521?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is assembla-merge-request-builder affected?
Yes, org.jenkins-ci.plugins:assembla-merge-request-builder is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2023-30521?
CVE-2023-30521 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:N/I:L/A:N.
What CWE is associated with CVE-2023-30521?
CVE-2023-30521 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-2023-30521?
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-jr86-6j4j-mv45",
  "modified" : "2023-04-21T17:52:22Z",
  "published" : "2023-04-12T18:30:36Z",
  "aliases" : [ "CVE-2023-30521" ],
  "summary" : "Jenkins Assembla merge request builder Plugin missing authentication to access endpoint",
  "details" : "Jenkins Assembla merge request builder Plugin provides a webhook endpoint at `/assembla-webhook/` that can be used to trigger builds of jobs configured to use a specified repository.\n\nIn Assembla merge request builder Plugin 1.1.13 and earlier, this endpoint can be accessed without authentication. This allows unauthenticated attackers to trigger builds of jobs corresponding to the attacker-specified repository.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.jenkins-ci.plugins:assembla-merge-request-builder"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "1.1.13"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-30521"
  }, {
    "type" : "WEB",
    "url" : "https://www.jenkins.io/security/advisory/2023-04-12/#SECURITY-2872"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2023/04/13/3"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-862" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-04-12T22:18:11Z",
    "nvd_published_at" : "2023-04-12T18:15:00Z"
  }
}