CVE-2021-33512 : Vulnerability Insights and Analysis

Plone through 5.2.4 allows stored XSS attacks (by a Contributor) by uploading an SVG or HTML document.

Understanding CVE-2021-33512

This CVE identifies a vulnerability in Plone that enables stored cross-site scripting (XSS) attacks when a Contributor uploads an SVG or HTML document.

What is CVE-2021-33512?

CVE-2021-33512 is a security vulnerability in Plone versions up to 5.2.4 that allows an attacker to execute malicious scripts in the context of a Contributor by uploading a crafted SVG or HTML file to the system.

The Impact of CVE-2021-33512

This vulnerability can be exploited by a malicious Contributor to inject arbitrary code, leading to potential data theft, unauthorized actions, or complete system compromise.

Technical Details of CVE-2021-33512

Plone through version 5.2.4 is susceptible to stored XSS attacks specifically via the uploading of SVG or HTML documents.

Vulnerability Description

The flaw allows Contributors to upload files containing malicious scripts, resulting in the execution of arbitrary code within the application.

Affected Systems and Versions

All Plone versions through 5.2.4 are impacted by this vulnerability.

Exploitation Mechanism

An attacker with Contributor permissions can exploit the vulnerability by uploading a specially crafted SVG or HTML file containing malicious scripts.

Mitigation and Prevention

It is crucial to take immediate steps to mitigate the risk posed by CVE-2021-33512 and implement long-term security practices.

Immediate Steps to Take

Disable file uploads containing SVG or HTML documents until a patch is applied. Restrict Contributor privileges to minimize the attack surface.

Long-Term Security Practices

Regularly update Plone to the latest version, educate users on safe file upload practices, and implement content security policies to prevent XSS attacks.

Patching and Updates

Apply the security hotfix released by Plone to address this vulnerability and stay updated on future security advisories.