CVE-2020-37096
📋 TL;DR
This CSRF vulnerability in Edimax EW-7438RPn's MAC filtering interface allows attackers to trick authenticated users into adding unauthorized MAC addresses to the device's filtering rules. This affects users who access the web interface of vulnerable Edimax range extenders.
💻 Affected Systems
- Edimax EW-7438RPn Mini
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could add malicious MAC addresses to bypass network access controls, potentially allowing unauthorized devices to connect to the network.
Likely Case
Attackers trick users into adding specific MAC addresses to bypass MAC filtering, enabling unauthorized network access.
If Mitigated
With proper CSRF protections and network segmentation, impact is limited to potential MAC filtering bypass on isolated devices.
🎯 Exploit Status
Exploit requires user interaction (visiting malicious page while authenticated). Proof of concept available on Exploit-DB.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not provided by vendor
Restart Required: No
Instructions:
No official patch available. Check vendor website for firmware updates.
🔧 Temporary Workarounds
Disable MAC Filtering Interface
allDisable or restrict access to the MAC filtering configuration interface if not needed.
Network Segmentation
allIsolate the range extender on a separate VLAN to limit potential impact.
🧯 If You Can't Patch
- Implement network-level MAC filtering on upstream devices
- Use browser extensions that block CSRF attempts
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface. If version is 1.13, device is vulnerable.Check Version:
Login to web interface and check firmware version in system settings.Verify Fix Applied:
No official fix available to verify.📡 Detection & Monitoring
Log Indicators:
- Unexpected MAC address additions in device logs
- Multiple MAC filtering configuration changes
Network Indicators:
- Unauthorized devices connecting via MAC addresses not in original whitelist
SIEM Query:
Search for MAC address changes in device configuration logs