CVE-2019-25419: Comodo Dome Firewall XSS Vulnerability

CVE-2019-25419 Overview

CVE-2019-25419 is a stored cross-site scripting (XSS) vulnerability affecting Comodo Dome Firewall version 2.7.0. This vulnerability allows attackers to inject malicious scripts by submitting crafted input to the schedule endpoint. Specifically, attackers can submit POST requests with JavaScript payloads in the SCHNAME parameter, which then execute arbitrary code in administrators' browsers when the schedule page is accessed.

Critical Impact

Successful exploitation enables attackers to execute arbitrary JavaScript code in the context of authenticated administrator sessions, potentially leading to session hijacking, credential theft, or unauthorized administrative actions on the firewall.

Affected Products

• Comodo Dome Firewall 2.7.0

Discovery Timeline

• 2026-02-19 - CVE-2019-25419 published to NVD
• 2026-02-19 - Last updated in NVD database

Technical Details for CVE-2019-25419

Vulnerability Analysis

This stored cross-site scripting vulnerability (CWE-79) exists in the schedule management functionality of Comodo Dome Firewall 2.7.0. The vulnerability is network-accessible and requires some user interaction—specifically, an administrator must view the schedule page where the malicious script has been stored. The stored nature of this XSS makes it particularly dangerous as the malicious payload persists in the application and executes every time a user accesses the affected page.

The attack can be initiated remotely without any authentication requirements, though successful exploitation depends on an administrator viewing the compromised schedule page. Once triggered, the injected script runs with the privileges of the viewing administrator, enabling various malicious activities including session token theft, keylogging, or performing administrative actions on behalf of the victim.

Root Cause

The root cause of this vulnerability is insufficient input validation and output encoding in the schedule endpoint. The SCHNAME parameter accepts user-supplied input without proper sanitization, and this input is subsequently rendered in the HTML response without adequate encoding. This allows JavaScript code embedded in the parameter to be interpreted and executed by the browser rather than being displayed as text.

Attack Vector

The attack is carried out via network-based POST requests to the schedule endpoint. An attacker crafts a malicious request containing JavaScript code in the SCHNAME parameter. This payload is stored in the application's database and later rendered on the schedule management page. When an administrator accesses this page, the stored script executes in their browser context.

The exploitation process follows these steps:

1. Attacker identifies the vulnerable schedule endpoint
2. Attacker submits a POST request with a JavaScript payload in the SCHNAME parameter
3. The payload is stored in the application database
4. An administrator navigates to the schedule page
5. The malicious script executes in the administrator's browser session

For detailed technical information about the exploitation technique, refer to the Exploit-DB entry #46408 and the VulnCheck advisory.

Detection Methods for CVE-2019-25419

Indicators of Compromise

• Unusual POST requests to the schedule endpoint containing script tags or JavaScript code in the SCHNAME parameter
• Presence of encoded JavaScript patterns such as <script>, javascript:, or event handlers like onerror, onload in schedule names
• Unexpected outbound connections from administrator workstations after accessing the firewall management interface

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block requests containing XSS patterns in POST parameters
• Enable detailed logging on the Comodo Dome Firewall management interface to capture all schedule modification requests
• Deploy browser-based XSS detection tools or Content Security Policy (CSP) headers to prevent inline script execution

Monitoring Recommendations

• Monitor HTTP traffic to the firewall management interface for suspicious patterns in POST request bodies
• Review schedule entries periodically for anomalous or suspicious content that may indicate injection attempts
• Implement alerting for any new or modified schedule entries containing special characters commonly used in XSS attacks

How to Mitigate CVE-2019-25419

Immediate Actions Required

• Upgrade Comodo Dome Firewall to a version that addresses this vulnerability if available
• Restrict network access to the firewall management interface to trusted IP addresses only
• Implement a Web Application Firewall (WAF) with XSS protection rules in front of the management interface
• Review existing schedule entries for any signs of malicious content injection

Patch Information

Consult Comodo's official security advisories and product documentation for patch availability. Visit the Comodo Dome Firewall product page for the latest version information and security updates.

Workarounds

• Limit access to the firewall management interface to a dedicated management network segment
• Use Content Security Policy (CSP) headers at the network level if supported by your infrastructure
• Regularly audit schedule entries and remove any suspicious content containing script elements or JavaScript code

# Example: Restrict management interface access via firewall rules
# Allow only trusted management IPs to access the web interface
iptables -A INPUT -p tcp --dport 443 -s 192.168.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP