CVE-2021-4139 : Exploit Details and Defense Strategies

This CVE-2021-4139 pertains to a security vulnerability in the pimcore/pimcore software, specifically related to Cross-site Scripting (XSS). It is rated with a CVSS base score of 6.6, indicating a medium severity issue with a low impact on confidentiality, integrity, and availability.

Understanding CVE-2021-4139

Cross-site Scripting (XSS) is a type of injection attack where malicious scripts are injected into web pages viewed by other users. This can lead to data theft, session hijacking, and other security risks.

What is CVE-2021-4139?

The vulnerability in pimcore/pimcore allows for improper neutralization of input during web page generation, leading to Cross-site Scripting (XSS) attacks. This could be exploited by an attacker to execute malicious scripts on the victim's browser.

The Impact of CVE-2021-4139

The impact of this vulnerability is rated as medium, with a CVSS base score of 6.6. While the attack complexity is low, it requires high privileges and can result in a change of scope, affecting the confidentiality, availability, and integrity of the system.

Technical Details of CVE-2021-4139

This section covers the specific technical details of the CVE-2021-4139 vulnerability.

Vulnerability Description

The vulnerability involves improper neutralization of input during web page generation, enabling stored Cross-site Scripting (XSS) attacks in pimcore/pimcore versions older than 10.2.7.

Affected Systems and Versions

The vulnerability affects pimcore/pimcore versions prior to 10.2.7. Users with custom versions are also at risk if not updated to the latest patch.

Exploitation Mechanism

Attackers can exploit this vulnerability by injecting malicious scripts through web page inputs, leading to stored XSS attacks in the pimcore/pimcore application.

Mitigation and Prevention

To address CVE-2021-4139, users and administrators can take the following steps:

Immediate Steps to Take

Update pimcore/pimcore to version 10.2.7 or newer to mitigate the vulnerability.
Regularly monitor for security updates and patches from the vendor to stay protected against emerging threats.

Long-Term Security Practices

Implement input validation mechanisms to prevent malicious script injections on web pages.
Educate users on safe browsing habits to reduce the risk of XSS attacks.

Patching and Updates

Stay informed about security advisories and updates provided by pimcore to ensure the software is up to date with the latest security fixes.