CVE-2022-35908
📋 TL;DR
This vulnerability in Cambium Enterprise Wi-Fi System Software allows attackers to execute arbitrary commands on affected devices by exploiting improper input sanitization in the ping host argument. Systems running software versions before 6.4.2 are vulnerable, potentially allowing attackers to gain control of Wi-Fi access points and network infrastructure.
💻 Affected Systems
- Cambium Enterprise Wi-Fi System Software
📦 What is this software?
Enterprise Wi Fi by Cambiumnetworks
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise allowing attackers to execute arbitrary commands, pivot to internal networks, deploy ransomware, or establish persistent backdoors on Wi-Fi infrastructure.
Likely Case
Remote code execution leading to device takeover, network disruption, credential theft from connected devices, or deployment of malware.
If Mitigated
Limited impact if network segmentation isolates Wi-Fi infrastructure and strict access controls prevent unauthorized access to management interfaces.
🎯 Exploit Status
The vulnerability involves improper input sanitization in a common network diagnostic function, making exploitation relatively straightforward once details are understood.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 6.4.2
Vendor Advisory: https://www.cambiumnetworks.com/support/security/
Restart Required: Yes
Instructions:
1. Download version 6.4.2 or later from Cambium support portal. 2. Backup current configuration. 3. Upload and apply firmware update through management interface. 4. Reboot affected devices. 5. Verify successful update.
🔧 Temporary Workarounds
Network Segmentation
allIsolate Wi-Fi management interfaces from untrusted networks
Access Control Lists
allRestrict access to device management interfaces to authorized IP addresses only
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Wi-Fi infrastructure from critical systems
- Deploy network monitoring and intrusion detection specifically for Wi-Fi management traffic
🔍 How to Verify
Check if Vulnerable:
Check software version in device management interface. If version is earlier than 6.4.2, system is vulnerable.Check Version:
Check via web interface: System > About or via CLI: show versionVerify Fix Applied:
Confirm software version shows 6.4.2 or later in management interface and verify ping functionality works normally.📡 Detection & Monitoring
Log Indicators:
- Unusual ping commands with special characters
- Multiple failed authentication attempts to device-agent
- Unexpected system process execution
Network Indicators:
- Unusual traffic to device-agent port
- Ping requests containing shell metacharacters
- Outbound connections from Wi-Fi devices to suspicious IPs
SIEM Query:
source="cambium_wifi" AND (event="ping_request" AND (command LIKE "%*%" OR command LIKE "%|%" OR command LIKE "%&%" OR command LIKE "%;%"))