CVE-2024-41720
📋 TL;DR
This vulnerability allows network-adjacent authenticated attackers to modify device configuration due to incorrect permission assignments in ZWX-2000CSW2-HN firmware. It affects users of Zexelon ZWX-2000CSW2-HN devices with firmware versions before 0.3.15.
💻 Affected Systems
- Zexelon ZWX-2000CSW2-HN
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
An attacker could reconfigure the device to disrupt operations, enable backdoors, or pivot to other network segments, potentially causing service disruption or data compromise.
Likely Case
Malicious insiders or compromised accounts could alter device settings to degrade performance, bypass security controls, or enable further attacks within the network.
If Mitigated
With proper network segmentation and access controls, impact is limited to configuration changes within the affected device's scope.
🎯 Exploit Status
Exploitation requires authenticated access but is straightforward once credentials are obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.3.15
Vendor Advisory: https://www.zexelon.co.jp/pdf/jvn70666401.pdf
Restart Required: Yes
Instructions:
1. Download firmware version 0.3.15 from Zexelon support portal. 2. Log into device web interface. 3. Navigate to System > Firmware Update. 4. Upload and apply the new firmware. 5. Reboot device after update completes.
🔧 Temporary Workarounds
Network Segmentation
allIsolate ZWX-2000CSW2-HN devices on separate VLANs with strict access controls.
Access Control Hardening
allImplement strong authentication, limit administrative accounts, and use network ACLs to restrict management access.
🧯 If You Can't Patch
- Implement strict network segmentation to limit device access to authorized management systems only.
- Enable detailed logging of configuration changes and monitor for unauthorized modifications.
🔍 How to Verify
Check if Vulnerable:
Check firmware version in device web interface under System > Information. If version is below 0.3.15, device is vulnerable.Check Version:
No CLI command available. Use web interface at System > Information.Verify Fix Applied:
Confirm firmware version shows 0.3.15 or higher in System > Information after update.📡 Detection & Monitoring
Log Indicators:
- Unexpected configuration changes
- Multiple failed login attempts followed by successful login and configuration changes
- Administrative actions from unusual IP addresses
Network Indicators:
- Unusual traffic patterns to/from device management interface
- Configuration file transfers to unexpected destinations
SIEM Query:
source="zwx-device" AND (event_type="config_change" OR user="admin") | stats count by src_ip, user, timestamp