CVE-2024-56914
📋 TL;DR
A buffer overflow vulnerability exists in the D-Link DSL-3782 router's Parental Control web interface. Attackers can exploit this by sending specially crafted requests to the /New_GUI/ParentalControl.asp endpoint, potentially leading to denial of service or remote code execution. This affects all users of D-Link DSL-3782 routers running firmware version 1.01.
💻 Affected Systems
- D-Link DSL-3782
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with root privileges, allowing complete compromise of the router and potential lateral movement into the network.
Likely Case
Denial of service causing router reboot or instability, disrupting network connectivity.
If Mitigated
Limited impact if the router is behind a firewall with restricted web interface access.
🎯 Exploit Status
Exploitation requires authentication to the web interface. The public PoC demonstrates buffer overflow triggering.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check D-Link support website for firmware updates. 2. Download latest firmware. 3. Log into router web interface. 4. Navigate to Maintenance > Firmware Update. 5. Upload and apply new firmware. 6. Wait for router to reboot.
🔧 Temporary Workarounds
Disable Parental Control
allTurn off the vulnerable Parental Control feature to prevent exploitation.
Restrict Web Interface Access
linuxConfigure firewall rules to limit access to the router's web interface.
iptables -A INPUT -p tcp --dport 80 -s trusted_ip -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
🧯 If You Can't Patch
- Disable remote management and only allow local network access to the web interface.
- Replace the vulnerable router with a supported model from D-Link or another vendor.
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router web interface under Maintenance > Firmware Update. If version is 1.01, the device is vulnerable.Check Version:
curl -s http://router_ip/New_GUI/ | grep -i firmwareVerify Fix Applied:
After updating firmware, verify the version number has changed from 1.01 in the web interface.📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts followed by requests to /New_GUI/ParentalControl.asp
- Unusual large POST requests to the Parental Control endpoint
Network Indicators:
- HTTP requests with abnormally long parameters to ParentalControl.asp
- Traffic patterns suggesting buffer overflow attempts
SIEM Query:
source="router_logs" AND (uri="/New_GUI/ParentalControl.asp" AND (content_length>1000 OR status_code=500))