CVE-2023-45580
📋 TL;DR
A buffer overflow vulnerability in multiple D-Link router models allows remote attackers to execute arbitrary code via specific parameters in the ddns.asp function. This affects D-Link DI-7003GV2, DI-7100G+V2, DI-7100GV2, DI-7200G+V2, DI-7200GV2, DI-7300G+V2, and DI-7400G+V2 devices running vulnerable firmware versions. Attackers can exploit this without authentication to gain full control of affected devices.
💻 Affected Systems
- D-Link DI-7003GV2.D1
- D-Link DI-7100G+V2.D1
- D-Link DI-7100GV2.D1
- D-Link DI-7200G+V2.D1
- D-Link DI-7200GV2.E1
- D-Link DI-7300G+V2.D1
- D-Link DI-7400G+V2.D1
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to persistent backdoor installation, network traffic interception, lateral movement to internal networks, and botnet recruitment.
Likely Case
Remote code execution allowing attackers to modify device configuration, steal credentials, or use device as pivot point for further attacks.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering and network segmentation.
🎯 Exploit Status
Proof-of-concept available in GitHub repository. Exploitation requires sending crafted HTTP requests to the ddns.asp endpoint with malicious parameters.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check D-Link support site for firmware updates. 2. Download appropriate firmware for your model. 3. Access router web interface. 4. Navigate to System Tools > Firmware Upgrade. 5. Upload firmware file. 6. Wait for reboot.
🔧 Temporary Workarounds
Disable WAN Management Access
allPrevent external access to router management interface
Access router web interface > Security > Remote Management > Disable
Block Access to ddns.asp
linuxUse firewall rules to block access to vulnerable endpoint
iptables -A INPUT -p tcp --dport 80 -m string --string "ddns.asp" --algo bm -j DROP
iptables -A INPUT -p tcp --dport 443 -m string --string "ddns.asp" --algo bm -j DROP
🧯 If You Can't Patch
- Isolate affected devices in separate VLAN with strict access controls
- Implement network monitoring for suspicious HTTP requests to ddns.asp endpoint
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router web interface under System Tools > Firmware InformationCheck Version:
curl -s http://router-ip/ | grep -i firmware || ssh admin@router-ip 'show version'Verify Fix Applied:
Verify firmware version is newer than affected versions listed above📡 Detection & Monitoring
Log Indicators:
- HTTP requests to /ddns.asp with unusual parameter values
- Multiple failed login attempts followed by successful access
Network Indicators:
- Unusual outbound connections from router
- HTTP POST requests to ddns.asp with long parameter strings
SIEM Query:
source="router_logs" AND (uri="*ddns.asp*" AND (param="*wild*" OR param="*mx*"))