CVE-2021-27823
📋 TL;DR
An unauthenticated information disclosure vulnerability exists in NetWave System 1.0's /index.class.php component on port 8181. This allows attackers to remotely access sensitive system information without credentials. All NetWave System 1.0 deployments with the vulnerable component exposed are affected.
💻 Affected Systems
- NetWave System
📦 What is this software?
Netwave System by Mediateknet
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise through credential harvesting, configuration exposure, and lateral movement using stolen sensitive data.
Likely Case
Exfiltration of system configuration, user data, and potentially authentication credentials leading to further attacks.
If Mitigated
Limited exposure of non-critical system information with proper network segmentation and access controls.
🎯 Exploit Status
Unauthenticated access to sensitive information via specific endpoint
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.netwavesystem.net/
Restart Required: No
Instructions:
1. Check vendor website for security updates
2. Apply any available patches
3. Verify the fix by testing the vulnerable endpoint
🔧 Temporary Workarounds
Network Access Restriction
linuxBlock external access to port 8181 using firewall rules
iptables -A INPUT -p tcp --dport 8181 -j DROP
Endpoint Protection
allImplement WAF rules to block requests to /index.class.php
🧯 If You Can't Patch
- Implement strict network segmentation to isolate NetWave System from untrusted networks
- Deploy intrusion detection systems to monitor for exploitation attempts on port 8181
🔍 How to Verify
Check if Vulnerable:
Attempt to access http://[target]:8181/index.class.php and check if sensitive information is returnedCheck Version:
Check NetWave System administration interface or configuration files for version informationVerify Fix Applied:
Test the same endpoint after remediation - should return error or no sensitive data📡 Detection & Monitoring
Log Indicators:
- Unusual access patterns to /index.class.php
- Multiple failed authentication attempts followed by successful access to sensitive endpoints
Network Indicators:
- Unusual traffic to port 8181 from external sources
- Large data transfers from the vulnerable endpoint
SIEM Query:
source_port=8181 AND (uri_path="/index.class.php" OR user_agent="*scanner*")