CVE-2019-25425: Comodo Dome Firewall XSS Vulnerability

CVE-2019-25425 Overview

CVE-2019-25425 is a reflected cross-site scripting (XSS) vulnerability affecting Comodo Dome Firewall version 2.7.0. The vulnerability allows attackers to inject malicious scripts by submitting crafted input to the VIRUS_ADMIN parameter. Attackers can send POST requests to the smtpconfig endpoint with script payloads to execute arbitrary JavaScript in the context of an administrator's browser session.

Critical Impact

Successful exploitation enables attackers to execute arbitrary JavaScript code within an authenticated administrator's browser session, potentially leading to session hijacking, credential theft, or administrative actions performed on behalf of the victim.

Affected Products

• Comodo Dome Firewall 2.7.0

Discovery Timeline

• 2026-02-19 - CVE-2019-25425 published to NVD
• 2026-02-19 - Last updated in NVD database

Technical Details for CVE-2019-25425

Vulnerability Analysis

This reflected XSS vulnerability exists in the SMTP configuration interface of Comodo Dome Firewall 2.7.0. The application fails to properly sanitize user-supplied input in the VIRUS_ADMIN parameter before reflecting it back in the HTTP response. This lack of input validation allows attackers to craft malicious requests containing JavaScript payloads that execute when processed by the victim's browser.

The vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation), which represents cross-site scripting vulnerabilities where untrusted data is included in web pages without proper validation or escaping. In this case, the smtpconfig endpoint processes POST request parameters without adequate output encoding, enabling script injection attacks.

Root Cause

The root cause of this vulnerability is improper input validation and output encoding in the Comodo Dome Firewall web management interface. When the smtpconfig endpoint receives POST requests containing the VIRUS_ADMIN parameter, the application reflects this input back to the user without sanitizing special characters or encoding HTML entities. This allows script tags and JavaScript event handlers to be injected and executed in the browser context.

Attack Vector

The attack vector is network-based and requires user interaction. An attacker must craft a malicious link or form that submits a POST request to the vulnerable smtpconfig endpoint with a JavaScript payload in the VIRUS_ADMIN parameter. When an authenticated administrator clicks the malicious link or submits the crafted form, the payload executes within their browser session.

The attack typically follows this pattern: the attacker prepares a POST request targeting the SMTP configuration endpoint, embedding malicious JavaScript within the VIRUS_ADMIN parameter. When the administrator's browser processes the response, the injected script executes with the privileges of the authenticated session. This can enable session token theft, arbitrary administrative actions, or further attacks against the firewall infrastructure.

For detailed technical information and proof-of-concept examples, refer to the Exploit-DB #46408 entry and the VulnCheck Advisory on Comodo Dome.

Detection Methods for CVE-2019-25425

Indicators of Compromise

• HTTP POST requests to smtpconfig endpoint containing script tags or JavaScript event handlers in the VIRUS_ADMIN parameter
• Unusual JavaScript execution patterns or DOM modifications in administrator browser sessions
• Suspicious outbound connections from administrator workstations following firewall management interface access

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block XSS patterns in POST request parameters
• Monitor HTTP logs for requests to the smtpconfig endpoint containing encoded or unencoded script payloads
• Deploy browser-based XSS detection mechanisms that alert on suspicious script execution

Monitoring Recommendations

• Enable detailed logging on the Comodo Dome Firewall management interface to capture all POST requests to configuration endpoints
• Implement Content Security Policy (CSP) headers to restrict script execution sources
• Monitor for authentication anomalies or session hijacking indicators following administrator access to the management interface

How to Mitigate CVE-2019-25425

Immediate Actions Required

• Restrict access to the Comodo Dome Firewall management interface to trusted networks and IP addresses only
• Implement network segmentation to limit exposure of the administrative interface
• Enable multi-factor authentication for administrator accounts where supported
• Deploy a web application firewall with XSS filtering capabilities in front of the management interface

Patch Information

Consult Comodo for the latest security updates and patches for Dome Firewall. Review the Comodo Firewall Overview page for current version information and security advisories. Organizations should upgrade to a patched version of the software as soon as one becomes available.

Workarounds

• Restrict management interface access to localhost or trusted internal networks using firewall rules
• Implement browser security extensions that block known XSS attack patterns for administrators
• Train administrators to avoid clicking untrusted links while authenticated to the firewall management interface
• Consider deploying the management interface behind a reverse proxy with XSS filtering capabilities

# Example firewall rule to restrict management interface access
# Limit access to the smtpconfig endpoint to trusted IPs only
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP