CVE-2025-66508
📋 TL;DR
This vulnerability in 1Panel allows attackers to bypass IP-based access controls by spoofing the X-Forwarded-For header. Any client can pretend to be from whitelisted IP addresses like 127.0.0.1, rendering IP-based security measures ineffective. All 1Panel users running versions 2.0.14 and below are affected.
💻 Affected Systems
- 1Panel
📦 What is this software?
1panel by Fit2cloud
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain unauthorized administrative access to the 1Panel control panel, potentially compromising the entire Linux server management system.
Likely Case
Unauthorized users bypass IP restrictions to access protected API endpoints or administrative interfaces they shouldn't have access to.
If Mitigated
With proper authentication and other layered security controls, impact is limited to bypassing IP-based restrictions only.
🎯 Exploit Status
Exploitation requires only HTTP header manipulation with tools like curl or Burp Suite.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.0.14
Vendor Advisory: https://github.com/1Panel-dev/1Panel/security/advisories/GHSA-7cqv-qcq2-r765
Restart Required: Yes
Instructions:
1. Backup your 1Panel configuration and data. 2. Update to version 2.0.14 or later using the 1Panel update mechanism. 3. Restart the 1Panel service. 4. Verify the fix by checking the version and testing IP restrictions.
🔧 Temporary Workarounds
Configure Trusted Proxies Manually
linuxModify Gin's TrustedProxies configuration to only trust specific proxy IP addresses instead of all addresses.
Edit 1Panel configuration to set TrustedProxies to specific CIDR ranges of your actual proxies
Network-Level IP Restriction
linuxImplement firewall rules at the network level to restrict access to 1Panel from authorized IP addresses only.
iptables -A INPUT -p tcp --dport [1Panel-port] -s [allowed-ip] -j ACCEPT
iptables -A INPUT -p tcp --dport [1Panel-port] -j DROP
🧯 If You Can't Patch
- Implement strong authentication mechanisms (MFA, complex passwords) to compensate for IP-based control failure
- Deploy a reverse proxy (like nginx) in front of 1Panel with proper IP validation and rate limiting
🔍 How to Verify
Check if Vulnerable:
Check if your 1Panel version is 2.0.14 or below and test if you can access restricted endpoints by sending X-Forwarded-For: 127.0.0.1 header.Check Version:
1panel versionVerify Fix Applied:
After updating, attempt the same X-Forwarded-For spoofing attack - it should no longer bypass IP restrictions.📡 Detection & Monitoring
Log Indicators:
- Multiple successful authentication attempts from unexpected IP addresses
- Access logs showing X-Forwarded-For header manipulation
Network Indicators:
- HTTP requests with X-Forwarded-For headers containing localhost or whitelisted IPs from unauthorized sources
SIEM Query:
source="1panel" AND (http_header="X-Forwarded-For" AND http_header_value IN ("127.0.0.1", "localhost", "::1")) AND src_ip NOT IN (allowed_ips)