Overview
CVE-2016-20023 describes a medium severity vulnerability affecting CKSource CKFinder before version 2.5.0.1 for ASP.NET. This vulnerability allows authenticated users to download arbitrary files from the server if they can provide the correct path to the target file. This poses a significant security risk as sensitive information stored on the server could be exposed.
Technical Details
The vulnerability stems from insufficient access control checks within CKFinder’s file download functionality. Authenticated users, even with limited privileges, could bypass intended restrictions by manipulating the file path parameter in a download request. This bypass allowed them to request and receive files outside of their authorized directories, potentially gaining access to configuration files, database credentials, or other sensitive data.
CVSS Analysis
- CVE ID: CVE-2016-20023
- Severity: MEDIUM
- CVSS Score: 5.0
A CVSS score of 5.0 indicates a Medium severity vulnerability. The exploit requires authentication, reducing the overall impact compared to unauthenticated vulnerabilities. However, the potential for data leakage makes it a significant concern.
Possible Impact
Successful exploitation of CVE-2016-20023 could have severe consequences, including:
- Data Breach: Exposure of sensitive information like configuration files, database credentials, and user data.
- System Compromise: If system files are accessible, attackers might gain the ability to modify or execute code on the server.
- Reputation Damage: A data breach can lead to significant reputational damage and loss of customer trust.
Mitigation and Patch Steps
The recommended mitigation is to upgrade to CKFinder for ASP.NET version 2.5.0.1 or later. This version contains the necessary security fixes to address the arbitrary file download vulnerability.
- Download the latest version: Obtain the latest version of CKFinder for ASP.NET from the official CKSource website.
- Backup your existing installation: Before upgrading, create a backup of your current CKFinder installation to prevent data loss in case of unforeseen issues.
- Install the new version: Follow the installation instructions provided by CKSource to replace your existing CKFinder installation with the updated version.
- Verify the installation: After the upgrade, verify that CKFinder is functioning correctly and that the vulnerability has been resolved.
