CVE-2020-11711 Explained : Impact and Mitigation

This CVE record pertains to an issue discovered in Stormshield SNS 3.8.0, involving Authenticated Stored XSS in the admin login panel leading to SSL VPN credential theft.

Understanding CVE-2020-11711

This vulnerability allows for the injection of malicious HTML content to execute JavaScript in a victim's browser, resulting in stored XSS on the admin panel's authentication interface.

What is CVE-2020-11711?

The issue in Stormshield SNS 3.8.0 allows for the upload of a malicious disclaimer file from the admin panel, which is then rendered on the authentication interface, enabling the execution of JavaScript in a victim's browser.

The Impact of CVE-2020-11711

The vulnerability can lead to SSL VPN credential theft and unauthorized access to sensitive information stored in the admin panel.

Technical Details of CVE-2020-11711

Vulnerability Description

Authenticated Stored XSS in the admin login panel
Unsecured authentication form on the SSL VPN captive portal
Possibility of modifying the admin panel's authentication form into a malicious form

Affected Systems and Versions

Vendor: n/a
Product: n/a
Affected Version: n/a

Exploitation Mechanism

The exploitation involves injecting malicious HTML content to execute JavaScript in a victim's browser, leading to stored XSS on the admin panel's authentication interface.

Mitigation and Prevention

Immediate Steps to Take

Disable the affected functionality if possible
Implement input validation to prevent XSS attacks
Educate users on safe browsing practices

Long-Term Security Practices

Regular security audits and code reviews
Stay informed about security updates and patches

Patching and Updates

Apply security patches provided by Stormshield