CVE-2020-13239 : Exploit Details and Defense Strategies

Dolibarr 11.0.4 allows for XSS through user-uploaded .html files when the attachment parameter is removed from the direct download link.

Understanding CVE-2020-13239

The vulnerability in Dolibarr 11.0.4 can lead to cross-site scripting (XSS) attacks.

What is CVE-2020-13239?

The DMS/ECM module in Dolibarr 11.0.4 renders user-uploaded .html files in the browser when the attachment parameter is removed from the direct download link, enabling XSS attacks.

The Impact of CVE-2020-13239

This vulnerability allows malicious actors to execute scripts in the context of a user's browser, potentially leading to unauthorized actions or data theft.

Technical Details of CVE-2020-13239

The technical aspects of the CVE-2020-13239 vulnerability.

Vulnerability Description

Dolibarr 11.0.4 mishandles user-uploaded .html files, allowing them to be rendered in the browser without the attachment parameter, leading to XSS.

Affected Systems and Versions

Product: Dolibarr
Version: 11.0.4

Exploitation Mechanism

Attackers can exploit this vulnerability by uploading malicious .html files and manipulating the direct download link to trigger XSS.

Mitigation and Prevention

Protecting systems from CVE-2020-13239.

Immediate Steps to Take

Avoid uploading untrusted .html files to Dolibarr.
Implement content security policies to restrict script execution.

Long-Term Security Practices

Regularly update Dolibarr to the latest version with security patches.
Educate users on safe file uploading practices.

Patching and Updates

Apply patches provided by Dolibarr to address the XSS vulnerability.