CVE-2019-16072
📋 TL;DR
This CVE describes a critical OS command injection vulnerability in NETSAS Enigma NMS that allows remote attackers to execute arbitrary commands on affected systems. Attackers can exploit this by injecting shell metacharacters into the ip_address parameter of the discover_and_manage CGI script. Organizations running Enigma NMS version 65.0.0 or earlier are affected.
💻 Affected Systems
- NETSAS Enigma NMS
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise leading to data theft, ransomware deployment, lateral movement across the network, and persistent backdoor installation.
Likely Case
Unauthorized command execution leading to service disruption, configuration changes, and potential credential harvesting.
If Mitigated
Limited impact with proper network segmentation, but still potential for service disruption if exploited.
🎯 Exploit Status
The vulnerability is straightforward to exploit with publicly available technical details showing the injection point in the snmp_browser action.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 65.0.0
Vendor Advisory: https://www.mogozobo.com/?p=3647
Restart Required: Yes
Instructions:
1. Contact NETSAS for updated version beyond 65.0.0. 2. Backup configuration and data. 3. Install the updated version. 4. Restart the Enigma NMS service. 5. Verify functionality.
🔧 Temporary Workarounds
Disable CGI script access
linuxBlock or remove access to the vulnerable discover_and_manage CGI script
mv /path/to/enigma/cgi-bin/discover_and_manage /path/to/enigma/cgi-bin/discover_and_manage.disabled
chmod 000 /path/to/enigma/cgi-bin/discover_and_manage.disabled
Web server access control
allConfigure web server to block access to the vulnerable endpoint
# For Apache: add to .htaccess or virtual host config
<Location "/cgi-bin/discover_and_manage">
Deny from all
</Location>
# For Nginx: add to server block
location = /cgi-bin/discover_and_manage {
deny all;
return 403;
}
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Enigma NMS from critical systems
- Deploy web application firewall (WAF) rules to block command injection patterns in the ip_address parameter
🔍 How to Verify
Check if Vulnerable:
Check if Enigma NMS version is 65.0.0 or earlier and if the discover_and_manage CGI script exists in the cgi-bin directoryCheck Version:
Check Enigma NMS web interface or configuration files for version informationVerify Fix Applied:
Verify version is greater than 65.0.0 and test that command injection attempts via the ip_address parameter are properly sanitized📡 Detection & Monitoring
Log Indicators:
- Unusual commands in web server logs containing shell metacharacters in ip_address parameter
- Multiple failed or successful requests to /cgi-bin/discover_and_manage with suspicious parameters
Network Indicators:
- Unusual outbound connections from Enigma NMS server
- Traffic patterns suggesting reverse shell establishment
SIEM Query:
source="web_server_logs" AND uri="/cgi-bin/discover_and_manage" AND (param="ip_address" AND value MATCHES "[;&|`$()]+")