CVE-2021-24439 : Exploit Details and Defense Strategies
Discover the impact of CVE-2021-24439 affecting Browser Screenshots plugin versions prior to 1.7.6, allowing Contributor-level users to execute Stored Cross-Site Scripting attacks. Learn about the vulnerability and necessary mitigation steps.
The Browser Screenshots WordPress plugin before version 1.7.6 allowed authenticated users with a role as low as Contributor to perform Stored Cross-Site Scripting attacks due to unescaped parameters.
Understanding CVE-2021-24439
This CVE involves a security vulnerability in the Browser Screenshots WordPress plugin prior to version 1.7.6, enabling unauthorized cross-site scripting attacks by users with limited roles.
What is CVE-2021-24439?
The Browser Screenshots plugin, specifically versions earlier than 1.7.6, permitted authenticated users with Contributor privileges to execute Stored Cross-Site Scripting attacks.
The Impact of CVE-2021-24439
This vulnerability could be exploited by malicious Contributor-level users to inject and execute arbitrary scripts, potentially affecting the security and integrity of the WordPress site.
Technical Details of CVE-2021-24439
This section delves into the specific technical aspects of the CVE.
Vulnerability Description
The vulnerability in the Browser Screenshots plugin allowed Contributors to carry out Stored Cross-Site Scripting attacks via the image_class parameter within the browser-shot shortcode.
Affected Systems and Versions
The issue impacts Browser Screenshots versions prior to 1.7.6, exposing WordPress sites to potential attacks by Contributor-level users.
Exploitation Mechanism
By exploiting the unescaped image_class parameter, authenticated users with limited roles such as Contributors could inject malicious scripts, leading to cross-site scripting attacks.
Mitigation and Prevention
In this section, we outline the steps to mitigate and prevent the exploitation of CVE-2021-24439.
Immediate Steps to Take
Website administrators are advised to update the Browser Screenshots plugin to version 1.7.6 or later to mitigate the vulnerability and enhance site security.
Long-Term Security Practices
Implementing regular security audits, monitoring user roles and privileges, and educating users on safe practices can help prevent similar exploits in the future.
Patching and Updates
Staying informed about security updates for WordPress plugins, promptly applying patches, and maintaining up-to-date versions are crucial for safeguarding websites against potential vulnerabilities.