CVE-2025-34309
📋 TL;DR
This stored XSS vulnerability in IPFire allows authenticated attackers to inject malicious JavaScript into Dynamic DNS host configurations. When other users view or edit these compromised entries, the scripts execute in their browser context. Only IPFire administrators with access to the Dynamic DNS configuration interface are affected.
💻 Affected Systems
- IPFire
📦 What is this software?
Ipfire by Ipfire
Ipfire by Ipfire
Ipfire by Ipfire
Ipfire by Ipfire
Ipfire by Ipfire
Ipfire by Ipfire
Ipfire by Ipfire
Ipfire by Ipfire
Ipfire by Ipfire
Ipfire by Ipfire
Ipfire by Ipfire
Ipfire by Ipfire
Ipfire by Ipfire
Ipfire by Ipfire
Ipfire by Ipfire
Ipfire by Ipfire
⚠️ Risk & Real-World Impact
Worst Case
An authenticated malicious administrator could steal session cookies, perform actions as other users, or redirect them to malicious sites, potentially leading to full system compromise.
Likely Case
An attacker with legitimate credentials could perform session hijacking, credential theft, or modify firewall rules through other users' sessions.
If Mitigated
With proper access controls limiting administrative accounts, impact is reduced to privilege escalation among authorized users.
🎯 Exploit Status
Requires authenticated access to the Dynamic DNS configuration interface. No public exploit code available as of analysis.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: IPFire 2.29 (Core Update 198)
Vendor Advisory: https://www.ipfire.org/blog/ipfire-2-29-core-update-198-released
Restart Required: No
Instructions:
1. Log into IPFire web interface as admin. 2. Navigate to System > Updates. 3. Apply Core Update 198. 4. Verify version shows 2.29.
🔧 Temporary Workarounds
Disable Dynamic DNS access
allRemove or restrict access to Dynamic DNS configuration for non-essential users
Implement Content Security Policy
allAdd CSP headers to restrict script execution from untrusted sources
🧯 If You Can't Patch
- Restrict Dynamic DNS configuration to only essential, trusted administrators
- Implement network segmentation to isolate IPFire management interface
🔍 How to Verify
Check if Vulnerable:
Check IPFire version via web interface dashboard or SSH command: 'cat /etc/ipfire-release'Check Version:
cat /etc/ipfire-releaseVerify Fix Applied:
Verify version is 2.29 or later and test Dynamic DNS fields for proper HTML encoding📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /cgi-bin/ddns.cgi with script tags in parameters
- Multiple Dynamic DNS configuration changes from single user
Network Indicators:
- Unexpected JavaScript execution in management interface
- Outbound connections from IPFire to unexpected domains
SIEM Query:
source="ipfire" AND (uri_path="/cgi-bin/ddns.cgi" AND (param="SERVICE" OR param="LOGIN" OR param="PASSWORD") AND (value="<script" OR value="javascript:"))