CVE-2023-47167
📋 TL;DR
This CVE describes an authenticated command injection vulnerability in TP-Link ER7206 Omada VPN routers. An attacker with valid credentials can execute arbitrary commands on the router by sending specially crafted HTTP requests. This affects administrators and organizations using the vulnerable router version.
💻 Affected Systems
- TP-Link ER7206 Omada Gigabit VPN Router
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete router compromise allowing attacker to install persistent backdoors, intercept network traffic, pivot to internal networks, or use the router for further attacks.
Likely Case
Router configuration manipulation, credential harvesting, network reconnaissance, or launching attacks against internal systems.
If Mitigated
Limited impact if strong authentication controls, network segmentation, and proper monitoring are in place.
🎯 Exploit Status
Exploitation requires valid credentials but command injection is straightforward once authenticated.
🛠️ 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 apply firmware update. 5. Reboot router.
🔧 Temporary Workarounds
Restrict Admin Access
allLimit router admin interface access to specific IP addresses or VLANs only.
Strong Authentication
allEnforce complex passwords and consider multi-factor authentication if supported.
🧯 If You Can't Patch
- Isolate router on separate management VLAN with strict access controls
- Implement network monitoring for unusual HTTP requests to router admin interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System Tools > Firmware UpgradeCheck Version:
Check via web interface or SSH if enabled: show versionVerify Fix Applied:
Confirm firmware version is newer than 1.3.0 build 20230322 Rel.70591📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP POST requests to GRE policy endpoints
- Multiple failed login attempts followed by successful login
Network Indicators:
- Unexpected outbound connections from router
- Unusual traffic patterns from router management interface
SIEM Query:
source="router_logs" AND (uri="/cgi-bin/luci/" OR uri CONTAINS "gre_policy") AND method="POST"