CVE-2023-47617
📋 TL;DR
This vulnerability allows authenticated attackers to execute arbitrary commands on TP-Link ER7206 Omada Gigabit VPN Router by sending specially crafted HTTP requests when configuring web group members. Attackers with valid credentials can gain remote code execution on affected devices. Only TP-Link ER7206 routers running specific vulnerable firmware versions are affected.
💻 Affected Systems
- TP-Link ER7206 Omada Gigabit VPN Router
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the router allowing attackers to intercept all network traffic, pivot to internal networks, install persistent backdoors, or use the device for further attacks.
Likely Case
Attackers with stolen or default credentials gain full control of the router, enabling traffic monitoring, credential theft, and network disruption.
If Mitigated
With strong authentication and network segmentation, impact is limited to the router itself without lateral movement to other systems.
🎯 Exploit Status
Exploitation requires authentication but is straightforward once credentials are obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check TP-Link for latest firmware updates
Vendor Advisory: https://www.tp-link.com/support/download/er7206/
Restart Required: Yes
Instructions:
1. Log into router admin interface. 2. Navigate to System Tools > Firmware Upgrade. 3. Download latest firmware from TP-Link. 4. Upload and install firmware. 5. Reboot router.
🔧 Temporary Workarounds
Restrict Admin Access
allLimit administrative access to specific IP addresses or VLANs
Change Default Credentials
allUse strong, unique passwords for all administrative accounts
🧯 If You Can't Patch
- Isolate the router in a dedicated network segment with strict firewall rules
- Disable remote administration and require VPN for management access
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router web interface under System Tools > Firmware UpgradeCheck Version:
No CLI command available - check via web interfaceVerify Fix Applied:
Verify firmware version is newer than 1.3.0 build 20230322 Rel.70591📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP POST requests to web group configuration endpoints
- Multiple failed login attempts followed by successful login
Network Indicators:
- Unusual outbound connections from router
- Suspicious commands in HTTP request payloads
SIEM Query:
source="router_logs" AND (uri="/cgi-bin/luci/" OR method="POST") AND (payload CONTAINS "$" OR payload CONTAINS "|" OR payload CONTAINS ";")