CVE-2024-24321
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on D-Link DIR-816A2 routers via a command injection flaw in the wizardstep4_ssid_2 parameter. Attackers can gain full control of affected devices without authentication. Only D-Link DIR-816A2 routers running specific vulnerable firmware versions are affected.
💻 Affected Systems
- D-Link DIR-816A2
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of router with persistent backdoor installation, network traffic interception, credential theft, and pivot to internal network devices.
Likely Case
Router takeover leading to DNS hijacking, credential harvesting, and denial of service against connected devices.
If Mitigated
Limited impact if device is behind firewall with restricted WAN access and proper network segmentation.
🎯 Exploit Status
Public GitHub repository contains exploit details and proof-of-concept. Exploitation requires sending crafted HTTP request to web interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.dlink.com/en/security-bulletin/
Restart Required: Yes
Instructions:
1. Check D-Link security bulletin for firmware updates. 2. Download latest firmware from official D-Link website. 3. Log into router admin interface. 4. Navigate to firmware update section. 5. Upload and apply new firmware. 6. Reboot router after update completes.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router web interface
Network Segmentation
allIsolate router management interface from untrusted networks
🧯 If You Can't Patch
- Replace affected router with supported model
- Implement strict firewall rules blocking all WAN access to router management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via admin interface or by accessing http://[router-ip]/info.htmlCheck Version:
curl -s http://[router-ip]/info.html | grep FirmwareVerify Fix Applied:
Verify firmware version has been updated to non-vulnerable release📡 Detection & Monitoring
Log Indicators:
- HTTP requests containing wizardstep4_ssid_2 parameter with shell metacharacters
- Unusual process execution in router logs
Network Indicators:
- HTTP POST requests to /goform/setWanWifi with command injection payloads
- Unexpected outbound connections from router
SIEM Query:
http.method:POST AND http.uri:"/goform/setWanWifi" AND http.param:"wizardstep4_ssid_2" AND (http.param.value:";" OR http.param.value:"|" OR http.param.value:"`" OR http.param.value:"$")🔗 References
- http://dir-816a2.com
- https://github.com/dkjiayu/Vul/blob/main/DIR816A2-dir_setWanWifi.md
- https://www.dlink.com/
- https://www.dlink.com/en/security-bulletin/
- http://dir-816a2.com
- https://github.com/dkjiayu/Vul/blob/main/DIR816A2-dir_setWanWifi.md
- https://www.dlink.com/
- https://www.dlink.com/en/security-bulletin/
