CVE-2022-1357
📋 TL;DR
CVE-2022-1357 is a critical OS command injection vulnerability in Cambium Networks cnMaestro On-Premise that allows unauthenticated attackers to execute arbitrary code with web server privileges. This affects organizations using vulnerable cnMaestro On-Premise deployments for wireless network management. Attackers can exploit this by injecting malicious commands into the logging functionality.
💻 Affected Systems
- Cambium Networks cnMaestro On-Premise
📦 What is this software?
Cnmaestro by Cambiumnetworks
Cnmaestro by Cambiumnetworks
Cnmaestro by Cambiumnetworks
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the cnMaestro server leading to network-wide device takeover, data exfiltration, and lateral movement to connected wireless infrastructure.
Likely Case
Unauthenticated remote code execution allowing attackers to install backdoors, steal credentials, and disrupt wireless network operations.
If Mitigated
Limited impact if proper network segmentation and access controls prevent external access to cnMaestro management interface.
🎯 Exploit Status
Public exploit code available, trivial exploitation requiring only HTTP requests to vulnerable endpoints.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.0.3 and later
Vendor Advisory: https://www.cambiumnetworks.com/support/cnmaestro/
Restart Required: Yes
Instructions:
1. Backup cnMaestro configuration. 2. Download cnMaestro 3.0.3 or later from Cambium support portal. 3. Upload and install update via cnMaestro web interface. 4. Restart cnMaestro services.
🔧 Temporary Workarounds
Network Access Control
linuxRestrict access to cnMaestro management interface to trusted IP addresses only
iptables -A INPUT -p tcp --dport 443 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP
🧯 If You Can't Patch
- Immediately isolate cnMaestro server from internet and restrict internal access to management VLAN only
- Implement strict network segmentation between cnMaestro and production wireless infrastructure
🔍 How to Verify
Check if Vulnerable:
Check cnMaestro version via web interface or SSH: cat /etc/cnmaestro/versionCheck Version:
cat /etc/cnmaestro/versionVerify Fix Applied:
Verify version is 3.0.3 or higher and test logging functionality for command injection📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in web server logs
- Suspicious POST requests to logging endpoints
- Unexpected system commands in cnMaestro logs
Network Indicators:
- Unusual outbound connections from cnMaestro server
- HTTP requests with shell metacharacters to cnMaestro
SIEM Query:
source="cnmaestro" AND (url="*logger*" OR cmd="*sh*" OR cmd="*bash*")