CVE-2021-35959 : Exploit Details and Defense Strategies

Plone versions 5.0 through 5.2.4 are susceptible to a Cross-Site Scripting (XSS) vulnerability in the folder contents view. This allows attackers to execute malicious scripts if a Contributor has inserted a SCRIPT tag in the description field.

Understanding CVE-2021-35959

This CVE details how Editors in Plone versions 5.0 through 5.2.4 are at risk of XSS attacks due to inadequate input validation.

What is CVE-2021-35959?

Editors in Plone 5.0 through 5.2.4 are exposed to XSS threats in the folder contents view, triggered by a Contributor including a SCRIPT tag in the description.

The Impact of CVE-2021-35959

The vulnerability enables attackers to inject and execute malicious scripts within the context of the vulnerable Plone instance, potentially leading to unauthorized actions.

Technical Details of CVE-2021-35959

This section covers the essential technical aspects of CVE-2021-35959.

Vulnerability Description

In Plone 5.0 through 5.2.4, Editors face XSS risks in the folder contents view when a folder is created with a SCRIPT tag in the description field.

Affected Systems and Versions

Plone versions 5.0 through 5.2.4 are confirmed to be impacted by this vulnerability.

Exploitation Mechanism

Attackers can exploit the vulnerability by having a Contributor create a folder with a SCRIPT tag in the description field, which can then be triggered in the folder contents view.

Mitigation and Prevention

Protect your systems from CVE-2021-35959 by following these mitigation strategies.

Immediate Steps to Take

Update Plone to a patched version that addresses the XSS vulnerability.
Educate Editors and Contributors about secure coding practices and the risks posed by unvalidated user input.

Long-Term Security Practices

Implement regular security training to keep users aware of emerging threats and how to handle them.
Conduct security audits and code reviews to identify and rectify vulnerabilities proactively.

Patching and Updates

Regularly check for security updates and patches from Plone to address known vulnerabilities like XSS issues.