CVE-2024-57679
📋 TL;DR
This vulnerability allows unauthenticated attackers to remotely configure the 2.4G and 5G repeater services on affected D-Link routers. Attackers can change wireless network settings without authentication via a crafted POST request to form2RepeaterSetup.cgi. This affects D-Link DIR-816A2 router users running vulnerable firmware.
💻 Affected Systems
- D-Link DIR-816A2
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could reconfigure the router's wireless settings to create rogue access points, intercept network traffic, or join the device to malicious networks for further attacks.
Likely Case
Attackers modify repeater settings to redirect traffic through attacker-controlled networks, enabling man-in-the-middle attacks and credential theft.
If Mitigated
With proper network segmentation and access controls, impact is limited to the affected device's wireless functionality.
🎯 Exploit Status
Exploitation requires sending a crafted POST request to the vulnerable endpoint
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: https://www.dlink.com/en/security-bulletin/
Restart Required: No
Instructions:
Check D-Link security bulletin for firmware updates. If no patch exists, implement workarounds.
🔧 Temporary Workarounds
Disable remote management
allDisable web management interface from WAN/Internet access
Access router admin panel → Advanced → Remote Management → Disable
Network segmentation
allPlace router on isolated network segment
🧯 If You Can't Patch
- Replace with supported router model
- Implement strict network firewall rules blocking access to port 80/443 on the router
🔍 How to Verify
Check if Vulnerable:
Check if router responds to POST requests to /form2RepeaterSetup.cgi without authenticationCheck Version:
Login to router admin panel and check firmware version in Status/System pageVerify Fix Applied:
Verify POST requests to form2RepeaterSetup.cgi require authentication or return error📡 Detection & Monitoring
Log Indicators:
- Unauthenticated POST requests to form2RepeaterSetup.cgi
- Unexpected changes to wireless repeater settings
Network Indicators:
- Unusual POST requests to router management interface from external IPs
- Changes to SSID or wireless settings without admin login
SIEM Query:
source_ip=external AND dest_port=80 AND uri_path="*form2RepeaterSetup.cgi*" AND http_method=POST