CVE-2019-25417 Overview
CVE-2019-25417 is a reflected Cross-Site Scripting (XSS) vulnerability in Comodo Dome Firewall version 2.7.0. The vulnerability allows attackers to inject malicious scripts by submitting crafted input to the protocol parameter in the QoS rules management endpoint. When an administrator accesses a maliciously crafted URL or processes a POST request containing a JavaScript payload in the protocol parameter, the injected script executes in the context of their browser session.
Critical Impact
Attackers can execute arbitrary JavaScript code in administrator browsers, potentially leading to session hijacking, credential theft, or unauthorized administrative actions on the firewall appliance.
Affected Products
- Comodo Dome Firewall 2.7.0
Discovery Timeline
- 2026-02-19 - CVE CVE-2019-25417 published to NVD
- 2026-02-19 - Last updated in NVD database
Technical Details for CVE-2019-25417
Vulnerability Analysis
This reflected XSS vulnerability exists in the QoS rules management functionality of Comodo Dome Firewall. The web application fails to properly sanitize user-supplied input in the protocol parameter before reflecting it back in the HTTP response. This lack of input validation allows attackers to inject arbitrary JavaScript code that executes within the security context of the administrative interface.
The vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation), which encompasses cross-site scripting flaws. The network-based attack vector requires user interaction, specifically an administrator must be tricked into clicking a malicious link or submitting a crafted form.
Root Cause
The root cause of this vulnerability is improper input validation and output encoding in the QoS rules management endpoint. The application accepts user input through the protocol parameter in POST requests and reflects this input in the response without adequate sanitization or encoding. This allows special characters used in HTML and JavaScript to be interpreted as code rather than data.
Attack Vector
The attack is executed by sending a POST request to the QoS rules management endpoint with a malicious JavaScript payload embedded in the protocol parameter. An attacker can craft a malicious link or web page that automatically submits this request when an authenticated administrator visits it. Since the injected script runs in the administrator's browser session, it inherits their privileges and can perform actions such as modifying firewall rules, extracting session tokens, or redirecting the user to malicious sites.
The vulnerability requires the attacker to socially engineer an administrator into interacting with the malicious content, but once triggered, the payload executes with full administrative context within the firewall management interface.
Detection Methods for CVE-2019-25417
Indicators of Compromise
- Unusual POST requests to the QoS rules management endpoint containing JavaScript syntax in the protocol parameter
- Web server logs showing encoded script tags or JavaScript event handlers in request parameters
- Browser error logs indicating blocked script execution from content security policy violations
Detection Strategies
- Implement web application firewall (WAF) rules to detect and block requests containing common XSS payloads in the protocol parameter
- Monitor HTTP request logs for suspicious patterns including <script>, javascript:, and event handler attributes in form submissions
- Deploy endpoint detection solutions to identify anomalous browser behavior following visits to the firewall management interface
Monitoring Recommendations
- Enable detailed logging on the Comodo Dome Firewall web interface to capture all administrative requests
- Review access logs regularly for unusual patterns in QoS rules management endpoint access
- Implement Content Security Policy (CSP) headers to restrict script execution sources
How to Mitigate CVE-2019-25417
Immediate Actions Required
- Restrict access to the Comodo Dome Firewall administrative interface to trusted IP addresses only
- Ensure administrators access the management interface only from trusted, isolated workstations
- Implement network segmentation to limit exposure of the firewall management interface
- Train administrators to recognize and avoid clicking suspicious links
Patch Information
Organizations should contact Comodo directly for information regarding security updates or patched versions that address this vulnerability. Review the VulnCheck Comodo Advisory for the latest remediation guidance.
Additional technical details are available at Exploit-DB #46408.
Workarounds
- Implement Content Security Policy (CSP) headers at a reverse proxy level to mitigate XSS execution if direct patching is not available
- Use a web application firewall to filter malicious input patterns before they reach the Comodo Dome Firewall interface
- Consider placing the management interface behind a VPN to reduce attack surface
- Enable HTTP-only and Secure flags on session cookies to limit the impact of potential XSS exploitation
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
