CVE-2020-20582
📋 TL;DR
This SSRF vulnerability in MipCMS allows attackers to make the server send unauthorized requests to internal systems. Attackers can potentially access sensitive information from internal networks. All MipCMS 5.0.1 installations with the vulnerable endpoint exposed are affected.
💻 Affected Systems
- MipCMS
📦 What is this software?
Mipcms by Mipcms
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of internal network services, data exfiltration from internal systems, and potential lateral movement to other servers.
Likely Case
Information disclosure from internal services, access to metadata services, and potential credential harvesting from internal APIs.
If Mitigated
Limited to port scanning of internal network or minimal information leakage if proper network segmentation exists.
🎯 Exploit Status
Exploitation requires authentication to access the admin endpoint. Public GitHub issue shows exploitation details.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch available. Consider upgrading to newer MipCMS version if available or implementing workarounds.
🔧 Temporary Workarounds
Restrict Admin Access
allLimit access to /ApiAdminDomainSettings.php endpoint to trusted IP addresses only.
# Apache: RewriteEngine On
RewriteCond %{REMOTE_ADDR} !^192\.168\.1\.
RewriteRule ^ApiAdminDomainSettings\.php$ - [F]
# Nginx: location ~ /ApiAdminDomainSettings\.php$ { allow 192.168.1.0/24; deny all; }
Input Validation
allAdd server-side validation to reject external URLs in domain settings parameters.
# PHP example in /ApiAdminDomainSettings.php
if (filter_var($input_url, FILTER_VALIDATE_URL) && parse_url($input_url, PHP_URL_HOST) !== $_SERVER['SERVER_NAME']) {
die('External URLs not allowed');
}
🧯 If You Can't Patch
- Implement strict network segmentation to isolate the MipCMS server from internal sensitive systems.
- Deploy a web application firewall (WAF) with SSRF protection rules to block malicious requests.
🔍 How to Verify
Check if Vulnerable:
Test if /ApiAdminDomainSettings.php accepts external URLs in parameters. Use curl: curl -X POST 'http://target/ApiAdminDomainSettings.php' -d 'domain=http://169.254.169.254'Check Version:
Check MipCMS version in admin panel or look for version file in installation directory.Verify Fix Applied:
Verify the endpoint rejects external URL requests and only accepts validated input.📡 Detection & Monitoring
Log Indicators:
- POST requests to /ApiAdminDomainSettings.php with external URLs in parameters
- Unusual outbound connections from web server to internal IP ranges
Network Indicators:
- Web server making requests to internal metadata services (169.254.169.254, 192.168.*)
- Unexpected connections from web server to database or internal API endpoints
SIEM Query:
source="web_logs" AND uri="/ApiAdminDomainSettings.php" AND (param CONTAINS "http://" OR param CONTAINS "https://")