CVE-2016-2296
📋 TL;DR
CVE-2016-2296 is an authentication bypass vulnerability in Meteocontrol WEB'log monitoring systems where the 'post-admin' login pages don't require authentication. This allows remote attackers to access administrative functions without credentials, potentially compromising sensitive data and system control. Organizations using affected Meteocontrol WEB'log Basic 100, Light, Pro, or Pro Unlimited versions are at risk.
💻 Affected Systems
- Meteocontrol WEB'log Basic 100
- Meteocontrol WEB'log Light
- Meteocontrol WEB'log Pro
- Meteocontrol WEB'log Pro Unlimited
📦 What is this software?
Web\'log Basic 100 by Meteocontrol
Web\'log Light by Meteocontrol
Web\'log Pro by Meteocontrol
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover allowing attackers to modify monitoring data, disrupt solar power operations, steal sensitive energy production information, and potentially pivot to other network systems.
Likely Case
Unauthorized access to administrative panels leading to data theft, configuration changes, and potential manipulation of energy monitoring systems.
If Mitigated
Limited impact with proper network segmentation and access controls preventing external access to vulnerable interfaces.
🎯 Exploit Status
Exploit requires only web browser access to vulnerable endpoints. Public exploit code available in exploit-db and security advisories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patched versions released by Meteocontrol (specific version numbers in vendor advisory)
Vendor Advisory: https://ics-cert.us-cert.gov/advisories/ICSA-16-133-01
Restart Required: Yes
Instructions:
1. Contact Meteocontrol for patched firmware/software versions. 2. Backup current configuration. 3. Apply vendor-provided update. 4. Restart the WEB'log system. 5. Verify authentication is now required for post-admin pages.
🔧 Temporary Workarounds
Network Access Control
linuxRestrict network access to WEB'log interface using firewall rules
iptables -A INPUT -p tcp --dport 80 -s trusted_network -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s trusted_network -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
Reverse Proxy with Authentication
allPlace vulnerable system behind reverse proxy requiring authentication
# Configure nginx/apache with authentication before proxying to WEB'log
🧯 If You Can't Patch
- Isolate the WEB'log system on a separate VLAN with strict access controls
- Implement network monitoring for unauthorized access attempts to post-admin endpoints
🔍 How to Verify
Check if Vulnerable:
Attempt to access http://[WEB'log_IP]/post-admin without authentication. If accessible, system is vulnerable.Check Version:
Check system version via WEB interface or contact Meteocontrol support for version verification.Verify Fix Applied:
Attempt to access post-admin pages without authentication - should receive authentication prompt or access denied.📡 Detection & Monitoring
Log Indicators:
- Unauthenticated access to /post-admin endpoints
- Multiple failed login attempts followed by successful post-admin access
Network Indicators:
- HTTP requests to /post-admin without preceding authentication requests
- Unusual administrative actions from non-admin IP addresses
SIEM Query:
source="web_logs" AND (url="/post-admin" OR url CONTAINS "post-admin") AND NOT (user!="" OR auth_success="true")