CVE-2021-21883
📋 TL;DR
This CVE allows authenticated attackers to execute arbitrary operating system commands on Lantronix PremierWave 2050 devices through the Web Manager Diagnostics Ping functionality. Successful exploitation gives attackers full system control. Organizations using affected Lantronix PremierWave 2050 devices with web management enabled are at risk.
💻 Affected Systems
- Lantronix PremierWave 2050
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to network pivoting, data exfiltration, or deployment of persistent malware across connected systems.
Likely Case
Unauthorized command execution allowing privilege escalation, configuration changes, or installation of backdoors on the affected device.
If Mitigated
Limited impact due to network segmentation, strong authentication controls, and restricted web interface access.
🎯 Exploit Status
Exploitation requires authentication but is straightforward once access is obtained. Public exploit details available in Talos reports.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Lantronix security advisory for latest patched version
Vendor Advisory: https://www.lantronix.com/support/security-advisories/
Restart Required: Yes
Instructions:
1. Check Lantronix security advisory for specific patch version. 2. Download firmware update from Lantronix support portal. 3. Apply update through web interface or console. 4. Reboot device to complete installation.
🔧 Temporary Workarounds
Disable Web Management Interface
allDisable the web management interface if not required for operations
Configuration varies by device - consult Lantronix documentation for CLI commands to disable web interface
Restrict Network Access
linuxLimit access to web management interface using firewall rules
iptables -A INPUT -p tcp --dport 80 -s trusted_ip -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s trusted_ip -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 segmentation to isolate affected devices
- Enforce strong authentication policies and change default credentials
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface (System > About) or CLI (show version)Check Version:
show version (CLI) or check System > About in web interfaceVerify Fix Applied:
Verify firmware version is updated beyond vulnerable version and test ping functionality with command injection attempts📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in system logs
- Multiple failed authentication attempts followed by successful login
- Unexpected processes spawned from web manager
Network Indicators:
- HTTP POST requests to /goform/ping with command injection payloads
- Outbound connections from device to unexpected destinations
SIEM Query:
source="lantronix_logs" AND (url="/goform/ping" AND (method="POST" OR params CONTAINS "|" OR params CONTAINS ";" OR params CONTAINS "`"))