CVE-2023-46371
📋 TL;DR
This CVE describes a critical stack overflow vulnerability in TP-Link routers that allows remote code execution. Attackers can exploit the upgradeInfoJsonToBin function to execute arbitrary code with root privileges. All users of affected TP-Link router models with vulnerable firmware versions are at risk.
💻 Affected Systems
- TP-Link TL-WDR7660
- TP-Link TL-WR886N
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attackers to install persistent malware, intercept all network traffic, pivot to internal networks, and create botnet nodes.
Likely Case
Remote code execution leading to router takeover, DNS hijacking, credential theft, and network surveillance.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering and network segmentation.
🎯 Exploit Status
Public proof-of-concept code exists in GitHub repositories. Exploitation appears straightforward based on available information.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not found in provided references
Restart Required: Yes
Instructions:
1. Check TP-Link official website for firmware updates. 2. Download latest firmware for your model. 3. Log into router admin interface. 4. Navigate to System Tools > Firmware Upgrade. 5. Upload and install new firmware. 6. Reboot router after installation.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router web interface
Login to router admin > Security > Remote Management > Disable
Network Segmentation
allIsolate router management interface from user networks
🧯 If You Can't Patch
- Replace affected routers with different models or brands
- Place routers behind dedicated firewalls with strict inbound filtering rules
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface: System Tools > Firmware UpgradeCheck Version:
Login to router web interface and check firmware version in System Tools sectionVerify Fix Applied:
Verify firmware version is no longer 2.0.30 (WDR7660) or 2.0.12 (WR886N)📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to upgrade endpoints
- Multiple failed upgrade attempts
- Unexpected firmware modification logs
Network Indicators:
- Unusual outbound connections from router
- DNS queries to suspicious domains
- Unexpected traffic patterns
SIEM Query:
source="router_logs" AND (uri="/cgi-bin/luci/" OR method="POST") AND (user_agent CONTAINS "curl" OR user_agent CONTAINS "wget")