CVE-2019-25417
📋 TL;DR
Comodo Dome Firewall 2.7.0 contains a reflected cross-site scripting vulnerability in the QoS rules management endpoint. Attackers can inject malicious JavaScript via the protocol parameter in POST requests, potentially executing arbitrary code in administrator browsers. This affects administrators using the web management interface of vulnerable Comodo Dome Firewall installations.
💻 Affected Systems
- Comodo Dome Firewall
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Administrator session hijacking leading to firewall configuration compromise, credential theft, or installation of persistent backdoors.
Likely Case
Session hijacking allowing attacker to perform administrative actions or steal sensitive firewall configuration data.
If Mitigated
Limited impact if administrators use separate browser profiles or sessions for firewall management.
🎯 Exploit Status
Exploit requires administrator to click malicious link while authenticated; public exploit code available on Exploit-DB.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.8.0 or later
Vendor Advisory: https://cdome.comodo.com/firewall/
Restart Required: Yes
Instructions:
1. Log into Comodo Dome Firewall admin interface. 2. Navigate to System > Updates. 3. Check for and apply available updates to version 2.8.0 or later. 4. Restart firewall services as prompted.
🔧 Temporary Workarounds
Input Validation Filter
allImplement web application firewall or input filtering to sanitize protocol parameter values
Content Security Policy
allImplement strict CSP headers to prevent script execution from untrusted sources
🧯 If You Can't Patch
- Restrict firewall management interface to trusted IP addresses only
- Use separate browser profiles or sessions for firewall management and general browsing
🔍 How to Verify
Check if Vulnerable:
Test by submitting <script>alert('XSS')</script> in protocol parameter to QoS rules endpoint while authenticatedCheck Version:
ssh admin@firewall-ip 'show version' or check in web interface under System > AboutVerify Fix Applied:
After update, attempt same XSS test; script should be sanitized or blocked📡 Detection & Monitoring
Log Indicators:
- POST requests to /qos_rules with script tags in parameters
- Unusual administrator session activity
Network Indicators:
- HTTP requests containing JavaScript payloads to firewall management interface
SIEM Query:
source="firewall_logs" AND uri_path="/qos_rules" AND (protocol="*<script>*" OR user_agent="*<script>*")