CVE-2019-25409: Comodo Dome Firewall XSS Vulnerability

CVE-2019-25409 Overview

CVE-2019-25409 is a reflected cross-site scripting (XSS) vulnerability affecting Comodo Dome Firewall version 2.7.0. This vulnerability allows attackers to inject malicious scripts by manipulating the destination parameter in POST requests to the routing endpoint. When exploited, attackers can execute arbitrary JavaScript code in the context of authenticated users' browsers, potentially leading to session hijacking, credential theft, or further compromise of the firewall management interface.

Critical Impact

Attackers can execute arbitrary JavaScript in users' browsers by sending crafted POST requests with malicious script payloads in the destination parameter, potentially compromising firewall administrator sessions.

Affected Products

• Comodo Dome Firewall 2.7.0

Discovery Timeline

• 2026-02-19 - CVE CVE-2019-25409 published to NVD
• 2026-02-19 - Last updated in NVD database

Technical Details for CVE-2019-25409

Vulnerability Analysis

This vulnerability falls under CWE-79 (Improper Neutralization of Input During Web Page Generation), commonly known as Cross-Site Scripting. The Comodo Dome Firewall web management interface fails to properly sanitize user-supplied input in the destination parameter before reflecting it back in HTTP responses.

The vulnerability exists in the routing endpoint of the firewall's administrative interface. When a user submits a POST request to this endpoint, the destination parameter value is included in the response without adequate encoding or sanitization. This allows an attacker to craft a malicious link or form that, when triggered by an authenticated administrator, executes attacker-controlled JavaScript within the security context of the firewall management session.

The network-based attack vector requires user interaction, as the victim must interact with a malicious link or be tricked into submitting a crafted form. However, once exploited, the impact can be significant given that the target is a firewall management interface with privileged access to network security configurations.

Root Cause

The root cause of this vulnerability is improper input validation and output encoding in the Comodo Dome Firewall web application. The routing endpoint accepts POST requests containing a destination parameter but fails to implement proper sanitization controls. Specifically, the application does not:

1. Validate that the destination parameter contains expected values
2. Encode special characters before reflecting the input in the HTML response
3. Implement Content Security Policy (CSP) headers that would mitigate script execution

Attack Vector

The attack leverages a network-based vector where an attacker crafts a malicious POST request containing JavaScript code in the destination parameter. The attack typically proceeds as follows:

1. The attacker identifies the vulnerable routing endpoint in the Comodo Dome Firewall interface
2. A malicious payload is embedded in the destination parameter (e.g., <script> tags or event handlers)
3. The attacker delivers the malicious request to an authenticated administrator through social engineering, such as phishing emails or malicious websites
4. When the victim's browser processes the response, the injected script executes with the victim's session privileges
5. The attacker can then steal session cookies, perform actions on behalf of the administrator, or redirect the user to attacker-controlled infrastructure

Due to the sensitive nature of firewall management interfaces, successful exploitation could allow attackers to modify firewall rules, access configuration data, or pivot to further attacks within the network.

Detection Methods for CVE-2019-25409

Indicators of Compromise

• Unusual POST requests to the firewall routing endpoint containing <script> tags or JavaScript event handlers in the destination parameter
• Web server logs showing requests with URL-encoded script payloads such as %3Cscript%3E or %22onmouseover%3D
• Session anomalies where administrator actions originate from unexpected IP addresses following XSS exploitation

Detection Strategies

• Deploy web application firewall (WAF) rules to detect and block common XSS payloads in POST request parameters
• Implement network intrusion detection signatures to identify reflected XSS attack patterns targeting firewall management interfaces
• Enable detailed logging on the Comodo Dome Firewall management interface and monitor for suspicious parameter values

Monitoring Recommendations

• Review web server access logs for the routing endpoint, filtering for requests containing script-related strings
• Monitor for unauthorized configuration changes to firewall rules that may indicate post-exploitation activity
• Alert on multiple failed or anomalous authentication attempts to the management interface following suspected XSS attempts

How to Mitigate CVE-2019-25409

Immediate Actions Required

• Restrict access to the Comodo Dome Firewall management interface to trusted IP addresses only using network-level access controls
• Implement a web application firewall (WAF) in front of the management interface to filter malicious input
• Educate administrators about XSS attacks and phishing attempts that may deliver malicious payloads

Patch Information

No official patch information is available in the CVE data. Organizations should contact Comodo directly for security updates or upgrade information for Dome Firewall. Review the VulnCheck Advisory on Comodo Dome and Exploit-DB #46408 for additional technical details.

Workarounds

• Limit management interface access to internal networks only and require VPN connections for remote administration
• Implement browser-based security controls such as Content Security Policy headers at the network level if possible
• Consider deploying a reverse proxy with input sanitization capabilities in front of the firewall management interface
• Use session timeouts and require re-authentication for sensitive firewall configuration changes