CVE-2020-36529
📋 TL;DR
This critical vulnerability in SevOne Network Management System allows remote attackers to execute arbitrary commands via the traceroute.php file, leading to privilege escalation. It affects all systems running SevOne NMS up to version 5.7.2.22. Attackers can exploit this without authentication to gain elevated privileges on the target system.
💻 Affected Systems
- SevOne Network Management System
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with root/admin access, data exfiltration, lateral movement within network, and persistent backdoor installation.
Likely Case
Unauthorized administrative access to the SevOne system, manipulation of network monitoring data, and potential access to credentials stored in the system.
If Mitigated
Limited impact due to network segmentation, strict firewall rules, and proper access controls preventing command execution.
🎯 Exploit Status
Public exploit code is available in disclosure reports. Attack requires network access to the SevOne web interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 5.7.2.23 and later
Vendor Advisory: https://www.sevone.com/
Restart Required: Yes
Instructions:
1. Download latest version from SevOne support portal. 2. Backup current configuration and data. 3. Apply update following vendor documentation. 4. Restart SevOne services. 5. Verify functionality.
🔧 Temporary Workarounds
Block traceroute.php access
allRestrict access to vulnerable traceroute.php file via web server configuration or firewall rules.
# Apache: <Location /traceroute.php> Require all denied </Location>
# Nginx: location /traceroute.php { deny all; }
Network segmentation
linuxIsolate SevOne management interface to trusted management network only.
# Example firewall rule (iptables): 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
🧯 If You Can't Patch
- Implement strict network access controls to limit SevOne interface access to authorized management IPs only.
- Deploy web application firewall (WAF) with command injection protection rules in front of SevOne.
🔍 How to Verify
Check if Vulnerable:
Check SevOne version via web interface admin panel or command line: grep 'version' /opt/sevone/etc/version.txtCheck Version:
grep 'version' /opt/sevone/etc/version.txtVerify Fix Applied:
Verify version is 5.7.2.23 or higher and test traceroute functionality works without allowing command injection.📡 Detection & Monitoring
Log Indicators:
- Unusual traceroute.php access from unexpected IPs
- Command execution patterns in web server logs
- Failed authentication attempts followed by traceroute.php access
Network Indicators:
- HTTP requests to /traceroute.php with shell metacharacters in parameters
- Outbound connections from SevOne server to unexpected destinations
SIEM Query:
source="sevone-web.log" AND (uri="/traceroute.php" AND (param="*;*" OR param="*|*" OR param="*`*"))