CVE-2023-50213
📋 TL;DR
This vulnerability allows network-adjacent attackers to execute arbitrary commands as root on D-Link G416 routers without authentication. Attackers can exploit improper input validation in the HTTP service to achieve remote code execution. Only D-Link G416 router users are affected.
💻 Affected Systems
- D-Link G416 router
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of router with root access, allowing attackers to intercept/modify all network traffic, install persistent malware, pivot to internal network devices, and brick the device.
Likely Case
Router takeover leading to DNS hijacking, credential theft from network traffic, and installation of backdoors for persistent access.
If Mitigated
No impact if router is patched or isolated from untrusted networks.
🎯 Exploit Status
ZDI published detailed advisory with exploitation details. Simple HTTP request with crafted parameters can trigger the vulnerability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for latest firmware
Vendor Advisory: https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10367
Restart Required: Yes
Instructions:
1. Log into router admin interface. 2. Navigate to firmware update section. 3. Download latest firmware from D-Link support site. 4. Upload and apply firmware update. 5. Reboot router after update completes.
🔧 Temporary Workarounds
Disable HTTP service
allDisable the vulnerable HTTP service on port 80 if not needed
Router-specific: Disable HTTP service in admin interface
Network segmentation
linuxIsolate router from untrusted networks using firewall rules
iptables -A INPUT -p tcp --dport 80 -j DROP (on router if possible)
🧯 If You Can't Patch
- Replace router with patched model or different vendor
- Place router behind dedicated firewall blocking port 80 from untrusted networks
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router admin interface and compare with patched version in vendor advisoryCheck Version:
Router-specific: Check via admin web interface or SSH if enabledVerify Fix Applied:
Verify firmware version matches or exceeds patched version in vendor advisory📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP requests to port 80 with command injection patterns
- Unexpected process execution from HTTP service
Network Indicators:
- HTTP requests containing shell metacharacters or command injection patterns to router port 80
SIEM Query:
source="router_logs" AND (http_request CONTAINS "|" OR http_request CONTAINS ";" OR http_request CONTAINS "`" OR http_request CONTAINS "$(") AND dest_port=80