CVE-2019-11199 : Exploit Details and Defense Strategies

Dolibarr ERP/CRM 9.0.1 encountered a security issue involving stored XSS in uploaded files, allowing the execution of malicious JavaScript payloads.

Understanding CVE-2019-11199

What is CVE-2019-11199?

The vulnerability in Dolibarr ERP/CRM 9.0.1 enabled the execution of JavaScript payloads through uploaded files, potentially impacting both regular and administrative users.

The Impact of CVE-2019-11199

The security flaw allowed users with low privileges to target administrators by triggering JavaScript payloads via malicious links within the same domain.

Technical Details of CVE-2019-11199

Vulnerability Description

The viewimage.php page in Dolibarr ERP/CRM 9.0.1 did not apply contextual output encoding, leading to the display of uploaded file contents based on user-requested MIME types.

Affected Systems and Versions

Product: Dolibarr ERP/CRM 9.0.1
Vendor: N/A
Version: N/A

Exploitation Mechanism

The vulnerability exploited stored XSS in uploaded files, allowing users to execute JavaScript payloads by clicking on malicious links within the same domain.

Mitigation and Prevention

Immediate Steps to Take

Update Dolibarr ERP/CRM to the latest version to patch the vulnerability.
Avoid clicking on suspicious links or downloading files from untrusted sources.

Long-Term Security Practices

Regularly monitor security advisories and patches for Dolibarr ERP/CRM.
Implement strict file upload and validation mechanisms to prevent XSS attacks.

Patching and Updates

Apply security patches promptly to address known vulnerabilities and enhance system security.