CVE-2023-41939 : Exploit Details and Defense Strategies

Jenkins SSH2 Easy Plugin 1.4 and earlier versions do not validate whether configured permissions are enabled, potentially granting access to users who no longer have entitlements.

Understanding CVE-2023-41939

This CVE affects Jenkins SSH2 Easy Plugin versions 1.4 and below, allowing unauthorized access to certain functionalities due to a lack of permission validation.

What is CVE-2023-41939?

The vulnerability in Jenkins SSH2 Easy Plugin versions 1.4 and earlier arises from the failure to verify the activation status of configured permissions. This oversight could lead to users retaining access to functions they no longer have permission for.

The Impact of CVE-2023-41939

The security flaw in CVE-2023-41939 could result in unauthorized users accessing restricted capabilities within the affected Jenkins SSH2 Easy Plugin versions, potentially leading to misuse or unintended actions.

Technical Details of CVE-2023-41939

The following information provides more insights into the vulnerability and its implications:

Vulnerability Description

Jenkins SSH2 Easy Plugin 1.4 and previous versions lack the necessary permission validation, which might allow users who were previously granted access to certain functionalities to retain that access even after permission revocation.

Affected Systems and Versions

The issue impacts specifically Jenkins SSH2 Easy Plugin versions 1.4 and earlier.

Exploitation Mechanism

Unauthorized users could exploit this vulnerability by leveraging the lack of permission validation in Jenkins SSH2 Easy Plugin 1.4 and earlier, gaining access to functionalities they should no longer have.

Mitigation and Prevention

To address and prevent the risks associated with CVE-2023-41939, consider the following strategies:

Immediate Steps to Take

Update Jenkins SSH2 Easy Plugin to version 1.5 or above to mitigate the vulnerability.
Review and adjust user permissions to restrict unauthorized access to sensitive functionalities.

Long-Term Security Practices

Regularly monitor and review permissions assignments to ensure users have the appropriate access levels.
Conduct security trainings for users to enhance awareness on access control.

Patching and Updates

Stay informed about security advisories and updates from Jenkins Project to promptly apply patches and ensure the integrity of your systems.