CVE-2022-0138
📋 TL;DR
This vulnerability allows remote code execution through insecure deserialization in Cambium Networks wireless devices. Attackers can send specially crafted data to create arbitrary classes and execute code on affected devices. Organizations using Cambium MMP, PTP C-series, or PTMP C-series/A5x devices are affected.
💻 Affected Systems
- Cambium Networks MMP
- Cambium Networks PTP C-series
- Cambium Networks PTMP C-series
- Cambium Networks PTMP A5x
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing persistent backdoor installation, network pivoting, and disruption of wireless connectivity services.
Likely Case
Remote code execution leading to device takeover, configuration modification, and potential lateral movement within the network.
If Mitigated
Limited impact if devices are behind firewalls with strict network segmentation and access controls.
🎯 Exploit Status
Exploitation requires sending specially crafted serialized data to the vulnerable deserialization function. No authentication required.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: MMP: v1.0.3; PTP C-series: v2.8.6.1; PTMP C-series and A5x: v2.5.4.1
Vendor Advisory: https://www.cisa.gov/uscert/ics/advisories/icsa-22-034-02
Restart Required: Yes
Instructions:
1. Download latest firmware from Cambium support portal. 2. Backup current configuration. 3. Upload and install firmware update via device web interface or CLI. 4. Reboot device. 5. Verify firmware version after reboot.
🔧 Temporary Workarounds
Network Segmentation
allIsolate affected devices in separate VLANs with strict firewall rules limiting access to management interfaces.
Access Control Lists
allImplement network ACLs to restrict access to device management interfaces to authorized IP addresses only.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate affected devices from untrusted networks
- Deploy intrusion detection systems to monitor for exploitation attempts and anomalous traffic patterns
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface (System > Status) or CLI command 'show version' and compare against patched versions.Check Version:
show version (CLI) or check System > Status in web interfaceVerify Fix Applied:
Confirm firmware version matches or exceeds: MMP v1.0.3, PTP C-series v2.8.6.1, or PTMP C-series/A5x v2.5.4.1📡 Detection & Monitoring
Log Indicators:
- Unusual process creation events
- Configuration changes not initiated by administrators
- Failed authentication attempts followed by successful access
Network Indicators:
- Unusual outbound connections from wireless devices
- Traffic patterns inconsistent with normal wireless operations
- Malformed serialization payloads sent to device management ports
SIEM Query:
source="cambium_device" AND (event_type="process_creation" OR event_type="config_change") AND user!="admin"