CVE-2020-21733 : Security Advisory and Response

Sagemcom F@ST3686 v1.0 HUN 3.97.0 has a cross-site scripting (XSS) vulnerability via specific URLs.

Understanding CVE-2020-21733

This CVE involves a security issue in Sagemcom F@ST3686 v1.0 HUN 3.97.0 that allows XSS attacks through certain web pages.

What is CVE-2020-21733?

CVE-2020-21733 is a vulnerability in the Sagemcom F@ST3686 v1.0 HUN 3.97.0 router that enables attackers to execute malicious scripts via specific URLs.

The Impact of CVE-2020-21733

This vulnerability could be exploited by attackers to inject malicious scripts into web pages viewed by users, potentially leading to various security risks such as data theft or unauthorized actions.

Technical Details of CVE-2020-21733

This section provides more in-depth technical information about the CVE.

Vulnerability Description

The XSS vulnerability in Sagemcom F@ST3686 v1.0 HUN 3.97.0 allows attackers to inject and execute malicious scripts through pages like RgDiagnostics.asp, RgDdns.asp, RgFirewallEL.asp, and RgVpnL2tpPptp.asp.

Affected Systems and Versions

Product: Sagemcom F@ST3686 v1.0 HUN 3.97.0
Vendor: Sagemcom
Version: 3.97.0

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting malicious scripts and injecting them into the vulnerable web pages, which are then executed in the context of the user's browser.

Mitigation and Prevention

Protecting systems from CVE-2020-21733 requires immediate actions and long-term security practices.

Immediate Steps to Take

Disable remote access to the router's administration interface if not needed.
Regularly monitor network traffic for any suspicious activities.
Implement content security policies to mitigate XSS risks.

Long-Term Security Practices

Keep router firmware up to date to patch known vulnerabilities.
Educate users about the risks of clicking on unknown links or visiting untrusted websites.

Patching and Updates

Check for firmware updates provided by Sagemcom to address the XSS vulnerability.