CVE-2019-25419
📋 TL;DR
Comodo Dome Firewall 2.7.0 contains a stored cross-site scripting vulnerability in the schedule endpoint. Attackers can inject malicious JavaScript via the SCHNAME parameter in POST requests, which executes in administrators' browsers when viewing the schedule page. This affects administrators of Comodo Dome Firewall 2.7.0 installations.
💻 Affected Systems
- Comodo Dome Firewall
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator session cookies, hijack administrative sessions, install backdoors, or pivot to internal network systems.
Likely Case
Attackers steal administrator credentials or session tokens to gain unauthorized administrative access to the firewall.
If Mitigated
With proper input validation and output encoding, malicious scripts would be neutralized before execution.
🎯 Exploit Status
Exploit requires authentication to access the schedule endpoint, but proof-of-concept code is publicly available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not publicly available
Restart Required: No
Instructions:
1. Check Comodo vendor website for security updates. 2. Apply any available patches. 3. Verify the fix by testing the schedule endpoint.
🔧 Temporary Workarounds
Input Validation Filter
allImplement server-side input validation to sanitize SCHNAME parameter values.
Not applicable - requires code modification
Content Security Policy
allImplement strict Content Security Policy headers to prevent script execution.
Not applicable - requires web server configuration
🧯 If You Can't Patch
- Restrict access to the firewall management interface to trusted IP addresses only.
- Implement web application firewall rules to block XSS payloads in POST requests.
🔍 How to Verify
Check if Vulnerable:
Test by submitting a benign XSS payload (e.g., <script>alert('test')</script>) to the schedule endpoint's SCHNAME parameter and check if it executes when viewing the schedule page.Check Version:
Check the firewall web interface for version information, typically under System > About or similar menu.Verify Fix Applied:
Retest with the same XSS payload after applying fixes to confirm it no longer executes.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to schedule endpoint with JavaScript payloads in parameters
- Multiple failed authentication attempts followed by schedule endpoint access
Network Indicators:
- HTTP POST requests containing script tags or JavaScript code in SCHNAME parameter
SIEM Query:
source="firewall_logs" AND (url_path="/schedule" OR parameter="SCHNAME") AND (content="<script>" OR content="javascript:")