CVE-2019-25406: Comodo Dome Firewall XSS Vulnerability

CVE-2019-25406 Overview

Comodo Dome Firewall 2.7.0 contains a reflected cross-site scripting (XSS) vulnerability that allows attackers to inject malicious scripts by manipulating the organization parameter. Attackers can send POST requests to the korugan/cmclient endpoint with script payloads in the organization parameter to execute arbitrary JavaScript in users' browsers. This vulnerability falls under CWE-79 (Improper Neutralization of Input During Web Page Generation).

Critical Impact

Attackers can execute arbitrary JavaScript in victim browsers, potentially leading to session hijacking, credential theft, or unauthorized actions performed on behalf of authenticated administrators managing firewall infrastructure.

Affected Products

• Comodo Dome Firewall 2.7.0

Discovery Timeline

• 2026-02-19 - CVE CVE-2019-25406 published to NVD
• 2026-02-19 - Last updated in NVD database

Technical Details for CVE-2019-25406

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 organization parameter before reflecting it back in the HTTP response. When a user clicks on a malicious link or submits a crafted form, the injected script executes within the security context of the vulnerable application.

The vulnerability is exploitable via network-based attacks and requires user interaction to trigger. Since the Comodo Dome Firewall is a network security appliance, successful exploitation could allow attackers to compromise administrative sessions, modify firewall rules, or exfiltrate sensitive configuration data from the management interface.

Root Cause

The root cause of this vulnerability is improper input validation and output encoding in the korugan/cmclient endpoint. The application directly reflects the organization parameter value in the HTTP response without sanitizing or encoding potentially dangerous characters such as <, >, ", and '. This allows attackers to break out of the expected HTML context and inject arbitrary script content.

Attack Vector

The attack vector involves crafting a malicious POST request to the korugan/cmclient endpoint with JavaScript code embedded in the organization parameter. An attacker typically delivers this payload via a phishing email or malicious webpage that tricks an authenticated administrator into submitting the crafted request. When the server reflects the unsanitized input back to the browser, the injected JavaScript executes with the privileges of the victim user.

The attack requires the victim to be authenticated to the Comodo Dome Firewall management interface for maximum impact. The attacker can then leverage the executed script to steal session cookies, capture keystrokes, redirect users to malicious sites, or perform administrative actions on the firewall.

Detection Methods for CVE-2019-25406

Indicators of Compromise

• Unusual POST requests to the korugan/cmclient endpoint containing script tags or JavaScript event handlers in parameters
• Web server logs showing URL-encoded script payloads (%3Cscript%3E) in the organization parameter
• Browser-based alerts or unexpected JavaScript execution when accessing firewall management pages
• Network traffic containing HTML special characters or JavaScript keywords in POST data to the firewall management interface

Detection Strategies

• Configure web application firewall (WAF) rules to detect and block XSS payloads in POST parameters targeting the korugan/cmclient endpoint
• Implement Content Security Policy (CSP) headers to restrict script execution sources and mitigate XSS impact
• Deploy endpoint detection solutions to monitor for suspicious browser behavior or unauthorized script execution
• Enable verbose logging on the Comodo Dome Firewall and analyze access logs for injection patterns

Monitoring Recommendations

• Monitor HTTP POST requests to firewall management endpoints for suspicious parameter values containing script tags or JavaScript syntax
• Implement anomaly detection for administrative session behavior to identify potential session hijacking attempts
• Set up alerts for multiple failed or unusual requests to the korugan/cmclient endpoint from external IP addresses
• Review firewall configuration changes for unauthorized modifications that may indicate successful exploitation

How to Mitigate CVE-2019-25406

Immediate Actions Required

• Restrict access to the Comodo Dome Firewall management interface to trusted networks only using IP allowlisting
• Implement a web application firewall (WAF) in front of the management interface to filter XSS payloads
• Enable HTTP-only and Secure flags on all session cookies to reduce the impact of potential session theft
• Educate administrators about phishing attacks and avoid clicking on suspicious links while authenticated to the firewall

Patch Information

Organizations should contact Comodo directly for information regarding security updates addressing this vulnerability. Review the VulnCheck Comodo Dome Advisory and Exploit-DB #46408 for additional technical details and mitigation guidance.

Workarounds

• Limit management interface access to a dedicated management VLAN or VPN-only access to reduce exposure
• Deploy a reverse proxy with input sanitization capabilities in front of the firewall management interface
• Implement browser-based XSS protections such as Content Security Policy headers if configurable
• Consider using a separate, isolated browser session when accessing firewall management to minimize credential exposure

# Example: Restrict management interface access via iptables
# Allow management access only from trusted admin network
iptables -A INPUT -p tcp --dport 443 -s 10.0.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP