CVE-2024-57683
📋 TL;DR
This vulnerability allows unauthenticated attackers to modify URL filter settings on affected D-Link DIR-816A2 routers via a crafted POST request. Attackers can bypass authentication requirements to change web filtering rules. This affects users running vulnerable firmware versions of the D-Link DIR-816A2 router.
💻 Affected Systems
- D-Link DIR-816A2
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could disable URL filtering entirely, allowing malicious traffic through the router, or redirect users to phishing/malware sites by manipulating filter rules.
Likely Case
Attackers modify URL filter settings to bypass parental controls or content restrictions, potentially exposing users to inappropriate or malicious content.
If Mitigated
With proper network segmentation and external filtering, the impact is limited to local network configuration changes only.
🎯 Exploit Status
Exploitation requires sending a crafted POST request to the vulnerable endpoint; proof-of-concept details are publicly available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.dlink.com/en/security-bulletin/
Restart Required: No
Instructions:
Check D-Link security bulletin for firmware updates. If available, download from official D-Link support site and flash via router web interface.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router management interface
Login to router admin panel → Advanced → Remote Management → Disable
Network Segmentation
allIsolate router management interface from untrusted networks
🧯 If You Can't Patch
- Replace router with supported model if no patch available
- Implement external web filtering solution to bypass router filtering
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router admin panel under Status → Device InfoCheck Version:
curl -s http://router-ip/status.cgi | grep firmwareVerify Fix Applied:
Verify firmware version is updated beyond vulnerable version📡 Detection & Monitoring
Log Indicators:
- POST requests to /goform/websURLFilterAddDel from unauthenticated sources
- Unexpected changes to URL filter settings
Network Indicators:
- HTTP POST requests to router IP on port 80/443 targeting /goform/websURLFilterAddDel
SIEM Query:
source="router.log" AND (uri="/goform/websURLFilterAddDel" OR action="filter_change") AND user="unauthenticated"