CVE-2019-25408: Comodo Dome Firewall XSS Vulnerability

CVE-2019-25408 Overview

Comodo Dome Firewall 2.7.0 contains a reflected cross-site scripting (XSS) vulnerability that allows attackers to inject malicious scripts by submitting crafted input to the netmask_addr parameter. This vulnerability enables attackers to execute arbitrary JavaScript code in users' browsers by sending specially crafted POST requests to the netwizard2 endpoint.

Critical Impact

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

Affected Products

• Comodo Dome Firewall 2.7.0

Discovery Timeline

• 2026-02-19 - CVE CVE-2019-25408 published to NVD
• 2026-02-19 - Last updated in NVD database

Technical Details for CVE-2019-25408

Vulnerability Analysis

This reflected cross-site scripting vulnerability (CWE-79) exists within the Comodo Dome Firewall web management interface. The vulnerability stems from improper handling of user-supplied input in the netmask_addr parameter when processed by the netwizard2 endpoint. When an attacker crafts a malicious POST request containing JavaScript code within this parameter, the application fails to properly sanitize or encode the input before reflecting it back to the user's browser.

The network-based attack vector requires user interaction, as a victim must be tricked into clicking a malicious link or submitting a crafted form. Upon successful exploitation, the attacker's JavaScript payload executes within the security context of the victim's browser session with the Dome Firewall management interface.

Root Cause

The root cause of CVE-2019-25408 is insufficient input validation and output encoding in the network wizard functionality of Comodo Dome Firewall. The netwizard2 endpoint accepts POST requests containing network configuration parameters, including netmask_addr, but fails to implement proper sanitization mechanisms. The application reflects user input directly into the HTTP response without encoding special characters, allowing script tags and event handlers to be interpreted as executable code by the browser.

Attack Vector

The attack leverages the network accessibility of the Comodo Dome Firewall management interface. An attacker constructs a malicious POST request targeting the netwizard2 endpoint with a JavaScript payload embedded in the netmask_addr parameter. The attacker then delivers this payload to potential victims through social engineering techniques such as phishing emails or malicious websites containing hidden forms that auto-submit to the vulnerable endpoint.

When an authenticated administrator interacts with the malicious request, the injected script executes with full access to the user's session, enabling theft of authentication cookies, keylogging, or performing administrative actions on the firewall without authorization. Additional technical details are available in the Exploit-DB #46408 advisory.

Detection Methods for CVE-2019-25408

Indicators of Compromise

• Unusual POST requests to the netwizard2 endpoint containing JavaScript tags or event handlers in the netmask_addr parameter
• Web server access logs showing encoded script payloads such as <script>, onerror=, or javascript: patterns in request parameters
• Browser console errors or unexpected JavaScript execution on firewall management pages

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block requests containing script injection patterns targeting the netwizard2 endpoint
• Deploy network intrusion detection systems (IDS) with signatures to identify XSS payload patterns in HTTP POST traffic destined for firewall management interfaces
• Configure SIEM correlation rules to alert on multiple failed or suspicious requests to administrative endpoints from external IP addresses

Monitoring Recommendations

• Enable detailed HTTP request logging on the Comodo Dome Firewall management interface to capture full POST body content
• Monitor for anomalous session activity following access to network wizard pages, such as rapid configuration changes or unexpected administrative actions
• Review access patterns to identify attempts to access the management interface from untrusted networks or unexpected geographic locations

How to Mitigate CVE-2019-25408

Immediate Actions Required

• Restrict access to the Comodo Dome Firewall management interface to trusted internal networks only using network segmentation or firewall rules
• Implement Content Security Policy (CSP) headers to prevent inline script execution if configurable
• Ensure administrators access the management interface only through verified bookmarks and avoid clicking links in emails or untrusted sources
• Consider placing a reverse proxy with WAF capabilities in front of the management interface to filter malicious requests

Patch Information

No official patch information is currently available from the vendor. Organizations should monitor the Comodo Dome Firewall product page for security updates and apply patches as soon as they become available. Review the VulnCheck Advisory for the latest vulnerability status and remediation guidance.

Workarounds

• Limit management interface access to specific IP addresses or VPN-only connections to reduce attack surface
• Implement browser-based XSS protection extensions for administrators who must access the management interface
• Use a dedicated browser profile or virtual machine for firewall administration to isolate potential compromise
• Enable multi-factor authentication (MFA) for administrative access to limit the impact of session hijacking

# Example: Restrict management interface access via iptables
# Allow management access only from trusted admin network
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP