CVE-2019-25418: Comodo Dome Firewall XSS Vulnerability

CVE-2019-25418 Overview

CVE-2019-25418 is a reflected Cross-Site Scripting (XSS) vulnerability affecting Comodo Dome Firewall version 2.7.0. The vulnerability allows remote attackers to inject malicious JavaScript code through crafted input submitted to the FWADDRESSES parameter. Attackers can exploit this flaw by sending specially crafted POST requests to the /korugan/fwgroups endpoint, enabling the execution of arbitrary JavaScript in victims' browsers and potentially leading to session hijacking or credential theft.

Critical Impact

Attackers can execute arbitrary JavaScript in authenticated users' browsers, potentially stealing session cookies, performing actions on behalf of victims, or redirecting users to malicious sites.

Affected Products

• Comodo Dome Firewall 2.7.0

Discovery Timeline

• 2026-02-19 - CVE-2019-25418 published to NVD
• 2026-02-19 - Last updated in NVD database

Technical Details for CVE-2019-25418

Vulnerability Analysis

This reflected XSS vulnerability exists in the Comodo Dome Firewall web management interface. The application fails to properly sanitize user-supplied input in the FWADDRESSES parameter before reflecting it back in HTTP responses. When an authenticated administrator or user visits a malicious link or submits a crafted form, the injected script executes within the context of the firewall management session.

The vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation), which represents a common class of web application security flaws where user input is not adequately validated or escaped before being included in web page output.

Root Cause

The root cause of this vulnerability is insufficient input validation and output encoding in the /korugan/fwgroups endpoint. The FWADDRESSES parameter accepts user input without proper sanitization, allowing script tags and other malicious HTML content to be reflected in the server's response and executed by the victim's browser.

Attack Vector

The attack vector is network-based, requiring user interaction for successful exploitation. An attacker would typically craft a malicious URL or form that, when accessed by an authenticated firewall administrator, sends a POST request containing JavaScript payload in the FWADDRESSES parameter to the vulnerable /korugan/fwgroups endpoint.

The attack scenario involves social engineering to trick an administrator into clicking a malicious link while authenticated to the Comodo Dome Firewall interface. Upon execution, the injected script runs with the privileges of the victim's session, enabling session token theft, administrative action hijacking, or further phishing attacks.

Detection Methods for CVE-2019-25418

Indicators of Compromise

• Unusual POST requests to /korugan/fwgroups containing script tags or encoded JavaScript in the FWADDRESSES parameter
• Web server logs showing HTML or JavaScript content embedded in request parameters
• Unexpected session activity or administrative changes following user access to external links
• Browser-based security warnings triggered by reflected script content

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block XSS payloads in POST parameters
• Monitor HTTP request logs for suspicious patterns including <script>, javascript:, or event handlers in the FWADDRESSES parameter
• Implement Content Security Policy (CSP) headers to mitigate script execution from untrusted sources
• Enable browser-based XSS protection features and audit security headers

Monitoring Recommendations

• Review web server access logs regularly for anomalous requests targeting the /korugan/fwgroups endpoint
• Configure SIEM alerts for potential XSS attack patterns in firewall management interface traffic
• Monitor administrator session activity for unauthorized or unexpected actions following link access
• Audit authentication logs for session anomalies that may indicate token theft

How to Mitigate CVE-2019-25418

Immediate Actions Required

• Restrict access to the Comodo Dome Firewall management interface to trusted networks only
• Implement network-level access controls to limit who can reach the /korugan/fwgroups endpoint
• Deploy a Web Application Firewall with XSS detection rules in front of the firewall management interface
• Educate administrators about the risks of clicking untrusted links while authenticated to management interfaces

Patch Information

Check with Comodo for available security updates addressing this vulnerability. Review the VulnCheck Advisory for additional technical details and remediation guidance. The Exploit-DB entry #46408 provides further context on the exploitation technique.

Workarounds

• Implement strict Content Security Policy (CSP) headers to prevent inline script execution
• Use a reverse proxy with XSS filtering capabilities to sanitize requests before they reach the firewall interface
• Restrict management interface access to specific IP addresses or VPN connections only
• Consider using a separate browser profile or session for firewall administration to limit cookie exposure

# Example: Restrict access to firewall management interface by IP
# Add to firewall or reverse proxy configuration
iptables -A INPUT -p tcp --dport 443 -s 192.168.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP