CVE-2019-25410: Comodo Dome Firewall XSS Vulnerability

CVE-2019-25410 Overview

Comodo Dome Firewall 2.7.0 contains a reflected cross-site scripting (XSS) vulnerability that allows attackers to inject malicious scripts through the source and destination parameters. Attackers can submit POST requests to the policy routing endpoint with script payloads in these parameters to execute arbitrary JavaScript in users' browsers. This vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation).

Critical Impact

Successful exploitation allows attackers to execute arbitrary JavaScript in the context of authenticated firewall administrators, potentially leading to session hijacking, credential theft, or unauthorized configuration changes to the firewall.

Affected Products

• Comodo Dome Firewall 2.7.0

Discovery Timeline

• 2026-02-19 - CVE-2019-25410 published to NVD
• 2026-02-19 - Last updated in NVD database

Technical Details for CVE-2019-25410

Vulnerability Analysis

This reflected cross-site scripting vulnerability exists in the policy routing functionality of Comodo Dome Firewall. The web management interface fails to properly sanitize user-supplied input in the source and destination parameters before reflecting them back to the user in HTTP responses. When an administrator is tricked into clicking a malicious link or submitting a crafted form, the attacker's JavaScript payload executes within the administrator's browser session.

The attack requires user interaction—specifically, an authenticated administrator must be convinced to interact with a malicious request. The vulnerability affects the subsequent system (the user's browser) rather than the firewall itself, allowing scripts to access session cookies, perform actions on behalf of the administrator, or redirect users to attacker-controlled sites.

Root Cause

The root cause is insufficient input validation and output encoding in the policy routing endpoint. The source and destination parameters accept arbitrary input that is reflected directly into the HTML response without proper sanitization or encoding. This allows script tags and JavaScript event handlers to be injected and executed by the browser.

Attack Vector

The attack is network-based and requires an attacker to craft a malicious POST request targeting the policy routing endpoint. The attacker must then socially engineer an authenticated administrator to submit this request, typically through phishing emails containing malicious links or by embedding the attack in a webpage the administrator visits.

The vulnerability is documented in Exploit-DB #46408. The attack leverages the fact that POST parameters source and destination are not properly validated, allowing injection of script elements that execute when the page renders in the victim's browser. For detailed technical analysis, refer to the VulnCheck Comodo Dome Advisory.

Detection Methods for CVE-2019-25410

Indicators of Compromise

• Unusual HTTP POST requests to the policy routing endpoint containing script tags or JavaScript event handlers
• Log entries showing <script> tags, javascript: protocol handlers, or HTML event attributes (e.g., onerror, onload) in the source or destination parameters
• Reports from users of unexpected browser behavior or redirect warnings when 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 and monitor for suspicious parameter values
• Deploy SentinelOne Singularity to detect malicious script execution patterns and browser-based attacks on administrator workstations

Monitoring Recommendations

• Monitor web server access logs for repeated requests to the policy routing endpoint with encoded or obfuscated payloads
• Set up alerts for HTTP POST requests to administrative endpoints containing common XSS payload patterns
• Review authentication logs for any unusual administrative sessions following potential phishing campaigns

How to Mitigate CVE-2019-25410

Immediate Actions Required

• Restrict access to the Comodo Dome Firewall management interface to trusted IP addresses only
• Implement network segmentation to limit exposure of the administrative interface
• Educate administrators about phishing attacks and the importance of not clicking untrusted links while authenticated to management interfaces
• Consider deploying a reverse proxy with XSS filtering capabilities in front of the management interface

Patch Information

Organizations should contact Comodo directly for information regarding security patches or updated firmware versions that address this vulnerability. Review the Comodo Firewall Overview for the latest product information and security updates.

Workarounds

• Enable Content Security Policy (CSP) headers at the web server level to mitigate the impact of XSS attacks
• Use browser extensions that block script execution or isolate administrative sessions in dedicated browser profiles
• Implement multi-factor authentication for all administrative access to reduce the impact of session hijacking
• Disable browser script execution when possible for administrative tasks

# Example: Restrict management interface access via iptables
iptables -A INPUT -p tcp --dport 443 -s 192.168.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP