CVE-2019-15640 : What You Need to Know

Limesurvey before version 3.17.10 lacks proper validation of both MIME type and file extension for images.

Understanding CVE-2019-15640

This CVE highlights a vulnerability in Limesurvey that could be exploited due to inadequate validation of image files.

What is CVE-2019-15640?

In Limesurvey versions prior to 3.17.10, the system fails to validate both the MIME type and file extension of image files, potentially leading to security risks.

The Impact of CVE-2019-15640

The vulnerability could allow malicious actors to upload files with incorrect MIME types and extensions, potentially leading to various attacks such as file execution or injection.

Technical Details of CVE-2019-15640

This section delves into the technical aspects of the CVE.

Vulnerability Description

The issue arises from the lack of validation for both MIME type and file extension of images in Limesurvey versions before 3.17.10.

Affected Systems and Versions

Product: Limesurvey
Vendor: N/A
Versions affected: All versions before 3.17.10

Exploitation Mechanism

Attackers can exploit this vulnerability by uploading image files with incorrect MIME types and extensions, bypassing security measures.

Mitigation and Prevention

To address CVE-2019-15640, follow these mitigation strategies:

Immediate Steps to Take

Update Limesurvey to version 3.17.10 or later to patch the vulnerability.
Implement input validation for file uploads to ensure correct MIME types and extensions.

Long-Term Security Practices

Regularly monitor and update software to address security vulnerabilities promptly.
Educate users on safe file upload practices to prevent exploitation of similar vulnerabilities.

Patching and Updates

Apply patches and updates provided by Limesurvey to fix the vulnerability and enhance system security.