CVE-2019-25407
📋 TL;DR
Comodo Dome Firewall 2.7.0 contains a reflected cross-site scripting vulnerability in the backup schedule interface. Attackers can inject malicious JavaScript via crafted POST requests to the backupschedule endpoint, potentially executing arbitrary scripts in users' browsers. This affects administrators and users accessing the firewall web interface.
💻 Affected Systems
- Comodo Dome Firewall
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attacker steals administrator session cookies, gains full control of firewall, modifies rules, creates backdoors, or pivots to internal network.
Likely Case
Attacker steals session cookies to hijack administrator sessions, potentially modifying firewall configurations or accessing sensitive information.
If Mitigated
Script execution blocked by browser security features or web application firewall, resulting in failed exploitation attempts.
🎯 Exploit Status
Exploit requires social engineering to trick user into clicking malicious link; 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 support portal. 2. Download latest version (2.8.0+). 3. Backup current configuration. 4. Install update following vendor instructions. 5. Restart firewall services.
🔧 Temporary Workarounds
Input Validation WAF Rule
allConfigure web application firewall to block requests containing JavaScript in BACKUP_RCPTTO parameter
WAF-specific configuration required
Restrict Management Interface Access
linuxLimit access to firewall management interface to trusted IP addresses only
iptables -A INPUT -p tcp --dport 443 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP
🧯 If You Can't Patch
- Implement strict Content Security Policy headers to block inline script execution
- Use browser extensions that prevent XSS attacks for all administrative users
🔍 How to Verify
Check if Vulnerable:
Test by sending POST request to /backupschedule with JavaScript payload in BACKUP_RCPTTO parameter and checking if script executesCheck Version:
ssh admin@firewall 'show version' or check web interface About pageVerify Fix Applied:
Attempt same test after patch; script should be properly sanitized and not execute📡 Detection & Monitoring
Log Indicators:
- POST requests to /backupschedule with JavaScript code in parameters
- Unusual parameter values in backup schedule requests
Network Indicators:
- HTTP requests containing <script> tags or JavaScript functions in POST data
SIEM Query:
source="firewall_logs" AND url="/backupschedule" AND (POST_data CONTAINS "<script>" OR POST_data CONTAINS "javascript:")