CVE-2024-23903: Gitlab branch source Remote Code Execution Vulnerability

LOW
Advisory Identifier: GHSA-f67f-2j6r-m4c9
Share
CVSS 3.7
CWE-697
Published
Advisory Summary

CVE-2024-23903 is a LOW (CVSS 3.7) remote code execution vulnerability (CWE-697: Incorrect Comparison) affecting Gitlab branch source libraries in the Maven ecosystem. The issue involves non-constant time webhook token comparison in jenkins gitlab branch source plugin. Remediation is available by upgrading affected packages to version 688.v5fa.

CVE-2024-23903 at a Glance

CVE Identifier CVE-2024-23903
GHSA Identifier GHSA-f67f-2j6r-m4c9
Severity LOW
CVSS v3.1 Base Score 3.7
CWE Classification CWE-697: Incorrect Comparison
Affected Product Gitlab branch source
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 3.7

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
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-2024-23903

To remediate this vulnerability, upgrade all affected Gitlab branch source 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:gitlab-branch-source fixed: 688.v5fa 
<dependency>
    <groupId>io.jenkins.plugins</groupId>
    <artifactId>gitlab-branch-source</artifactId>
    <version>688.v5fa</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-2024-23903, 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 Gitlab branch source in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 688.v5fa), 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-697: Incorrect Comparison, where the product compares two entities in a security-relevant context, but the comparison is incorrect. In Gitlab branch source, 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 GitLab Branch Source Plugin 684.vea_fa_7c1e2fe3 and earlier does not use a constant-time comparison function when checking whether the provided and expected webhook token are equal. This could potentially allow attackers to use statistical methods to obtain a valid webhook token. GitLab Branch Source Plugin 688.v5fa_356ee8520 uses a constant-time comparison function when validating the webhook token.

CVE-2024-23903 Affected Gitlab branch source Versions

1 component(s)
Fixed Versions:
688.v5fa
Product / Package Ecosystem Affected Versions Fixed Version
io.jenkins.plugins:gitlab-branch-source
maven/io.jenkins.plugins/gitlab-branch-source
Maven
< 688.v5fa
688.v5fa

References

NVD — CVE-2024-23903 NVD
https://nvd.nist.gov/vuln/detail/CVE-2024-23903
Security Fix Commit FIX COMMIT
https://github.com/jenkinsci/gitlab-branch-source-plugin/commit/8bfe1046cf342b99419457b9336addbbf346f89a
Gitlab branch source Source Repository REPOSITORY
https://github.com/jenkinsci/gitlab-branch-source-plugin
Gitlab branch source Security Information SECURITY
https://www.jenkins.io/security/advisory/2024-01-24/#SECURITY-2871
Gitlab branch source Security Information SECURITY
http://www.openwall.com/lists/oss-security/2024/01/24/6

Frequently Asked Questions

What is CVE-2024-23903?
CVE-2024-23903 is a security vulnerability in Gitlab branch source involving Non-constant time webhook token comparison in Jenkins GitLab Branch Source Plugin under CWE-697: Incorrect Comparison.
Which Gitlab branch source versions are affected?
Affected versions include releases prior to 688.v5fa across affected packages: io.jenkins.plugins:gitlab-branch-source.
What version fixes CVE-2024-23903?
Upgrading to 688.v5fa (or the latest patched release for your respective branch) resolves the vulnerability.
Is gitlab-branch-source affected?
Yes, io.jenkins.plugins:gitlab-branch-source is affected in releases prior to 688.v5fa. Upgrade your dependency to 688.v5fa or later.
What is the CVSS score of CVE-2024-23903?
CVE-2024-23903 has a CVSS v3.1 base score of 3.7 (LOW) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N.
What CWE is associated with CVE-2024-23903?
CVE-2024-23903 is classified under CWE-697: Incorrect Comparison (The product compares two entities in a security-relevant context, but the comparison is incorrect.).
How can I check Maven dependencies for CVE-2024-23903?
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-f67f-2j6r-m4c9",
  "modified" : "2024-01-31T20:24:55Z",
  "published" : "2024-01-24T18:31:02Z",
  "aliases" : [ "CVE-2024-23903" ],
  "summary" : "Non-constant time webhook token comparison in Jenkins GitLab Branch Source Plugin ",
  "details" : "Jenkins GitLab Branch Source Plugin 684.vea_fa_7c1e2fe3 and earlier does not use a constant-time comparison function when checking whether the provided and expected webhook token are equal.\n\nThis could potentially allow attackers to use statistical methods to obtain a valid webhook token.\n\nGitLab Branch Source Plugin 688.v5fa_356ee8520 uses a constant-time comparison function when validating the webhook token.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "io.jenkins.plugins:gitlab-branch-source"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "688.v5fa"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2024-23903"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/jenkinsci/gitlab-branch-source-plugin/commit/8bfe1046cf342b99419457b9336addbbf346f89a"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/jenkinsci/gitlab-branch-source-plugin"
  }, {
    "type" : "WEB",
    "url" : "https://www.jenkins.io/security/advisory/2024-01-24/#SECURITY-2871"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2024/01/24/6"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-697" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-01-24T21:50:51Z",
    "nvd_published_at" : "2024-01-24T18:15:09Z"
  }
}