CVE-2019-25413: Comodo Dome Firewall XSS Vulnerability

CVE-2019-25413 Overview

CVE-2019-25413 is a reflected cross-site scripting (XSS) vulnerability affecting Comodo Dome Firewall version 2.7.0. The vulnerability allows unauthenticated attackers to inject malicious scripts by manipulating the ID parameter in requests to the /manage/ips/rules/ endpoint. When a victim accesses a crafted URL, arbitrary JavaScript code executes within the context of their browser session, potentially leading to credential theft, session hijacking, or further malicious actions against the firewall management interface.

Critical Impact

Unauthenticated attackers can execute arbitrary JavaScript in victim browsers, potentially compromising firewall administrator sessions and enabling unauthorized access to network security configurations.

Affected Products

• Comodo Dome Firewall 2.7.0

Discovery Timeline

• 2026-02-19 - CVE-2019-25413 published to NVD
• 2026-02-19 - Last updated in NVD database

Technical Details for CVE-2019-25413

Vulnerability Analysis

This reflected XSS vulnerability (CWE-79) exists within the Comodo Dome Firewall web management interface. The vulnerability stems from improper sanitization of user-supplied input in the ID parameter when accessing the /manage/ips/rules/ endpoint. When a user clicks a malicious link containing JavaScript payload in the ID parameter, the server reflects this unsanitized input back to the browser, causing execution of the attacker's script.

The attack requires user interaction—specifically, the victim must click a crafted malicious link or be redirected to the vulnerable endpoint. Because the firewall management interface handles sensitive network security configurations, successful exploitation could allow attackers to steal administrator session cookies, perform actions on behalf of authenticated users, or extract sensitive configuration data from the firewall dashboard.

Root Cause

The root cause is insufficient input validation and output encoding in the web application's handling of the ID parameter. The application fails to properly sanitize special characters such as <, >, and quotes before reflecting user input back into the HTML response. This allows attackers to break out of the expected context and inject executable script content.

Attack Vector

The attack is network-based and does not require authentication to exploit. An attacker crafts a malicious URL targeting the /manage/ips/rules/ endpoint with a JavaScript payload embedded in the ID parameter. The attacker then distributes this URL through phishing emails, malicious websites, or other social engineering techniques. When an authenticated administrator clicks the link, the malicious script executes within their authenticated session context.

The vulnerability mechanism involves reflecting unsanitized input from the ID parameter directly into the page response. Attackers can inject script tags or event handlers that execute arbitrary JavaScript when the page renders. For technical details regarding exploitation, refer to the Exploit-DB #46408 entry and the VulnCheck Advisory.

Detection Methods for CVE-2019-25413

Indicators of Compromise

• HTTP requests to /manage/ips/rules/ containing script tags, event handlers, or JavaScript code in the ID parameter
• Unusual URL patterns with encoded characters like %3Cscript%3E or javascript: in query strings targeting the firewall management interface
• Web server logs showing requests with anomalous ID parameter values containing special characters

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block XSS payloads in request parameters
• Monitor HTTP access logs for requests to /manage/ips/rules/ with suspicious ID parameter values
• Implement Content Security Policy (CSP) headers to mitigate script execution from untrusted sources
• Use intrusion detection systems to alert on XSS attack patterns targeting the Comodo Dome Firewall interface

Monitoring Recommendations

• Enable detailed logging for all requests to the firewall management interface
• Set up alerts for requests containing common XSS indicators such as <script>, onerror=, onload=, or javascript:
• Review access logs regularly for unusual patterns indicating reconnaissance or exploitation attempts

How to Mitigate CVE-2019-25413

Immediate Actions Required

• Restrict access to the Comodo Dome Firewall management interface to trusted internal networks only
• Implement network segmentation to limit exposure of the management interface
• Deploy a reverse proxy or WAF with XSS filtering capabilities in front of the management interface
• Educate administrators about phishing risks and the importance of not clicking suspicious links

Patch Information

Consult Comodo's official resources for updated firmware or software versions that address this vulnerability. Review the Comodo Firewall product page for available security updates. If no patch is available, prioritize implementing compensating controls such as network access restrictions and WAF deployment.

Workarounds

• Limit management interface access to specific IP addresses or VPN-only connections
• Implement strict Content Security Policy headers to prevent inline script execution
• Use browser-based XSS protection features and ensure administrators use modern browsers with built-in protections
• Consider placing the management interface behind an authenticated reverse proxy with additional security controls

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