CVE-2021-24667 : Vulnerability Insights and Analysis

A stored cross-site scripting vulnerability has been discovered in a plugin called Gallery Blocks with Lightbox. Users with low privileges can execute arbitrary script code due to insufficient validation of image parameters.

Understanding CVE-2021-24667

This CVE refers to an authenticated stored cross-site scripting vulnerability in Gallery Blocks with Lightbox plugin version 2.2.0 and below.

What is CVE-2021-24667?

The vulnerability allows users with low privileges to run malicious scripts within the application, posing a security risk to the affected systems.

The Impact of CVE-2021-24667

The impact of this vulnerability includes unauthorized execution of malicious scripts, potential data theft, and compromise of sensitive information stored in the application.

Technical Details of CVE-2021-24667

The vulnerability stems from insufficient validation of image parameters, enabling attackers to inject and execute arbitrary script code in the context of the application.

Vulnerability Description

The flaw exists in the Lightbox functionality, allowing attackers to exploit the vulnerability by manipulating image parameters.

Affected Systems and Versions

Gallery Blocks with Lightbox versions less than 2.2.1 are affected by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting malicious images or scripts that, when processed by the application, execute arbitrary code.

Mitigation and Prevention

To address CVE-2021-24667, users are advised to take the following steps:

Immediate Steps to Take

Update Gallery Blocks with Lightbox to version 2.2.1 or higher.
Restrict access to the plugin to trusted users to reduce the risk of exploitation.

Long-Term Security Practices

Regularly monitor and audit the plugin for security updates and patches.
Educate users on safe practices to prevent the execution of untrusted scripts within the application.

Patching and Updates

Stay informed about security advisories and promptly apply patches released by the vendor to address known vulnerabilities.