CVE-2023-45578
📋 TL;DR
A buffer overflow vulnerability in multiple D-Link router models allows remote attackers to execute arbitrary code by sending specially crafted requests to the pppoe_base.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 gain full control of affected devices without authentication.
💻 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 attacker to reconfigure device, steal credentials, or use device as pivot point for internal attacks.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering and network segmentation.
🎯 Exploit Status
Public proof-of-concept exists in GitHub repository. Exploitation requires sending HTTP POST request with crafted pap_en/chap_en parameter.
🛠️ 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 for your model. 3. Access router web interface. 4. Navigate to firmware update section. 5. Upload and apply new firmware. 6. Reboot device.
🔧 Temporary Workarounds
Disable web management interface
allPrevent access to vulnerable web interface by disabling remote management
Access router web interface -> Administration -> Remote Management -> Disable
Restrict access with firewall rules
linuxBlock external access to router management interface
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
🧯 If You Can't Patch
- Isolate affected devices in separate VLAN with strict firewall rules
- Implement network monitoring for exploitation attempts and anomalous traffic
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router web interface under Maintenance -> Firmware or via SSH/Telnet if enabledCheck Version:
curl -s http://router-ip/status.asp | 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 POST requests to /pppoe_base.asp with long pap_en/chap_en parameters
- Unusual process execution in router logs
- Configuration changes without authorization
Network Indicators:
- HTTP traffic to router management interface with abnormal parameter lengths
- Outbound connections from router to unknown IPs
SIEM Query:
source="router_logs" AND (uri="/pppoe_base.asp" AND (param_length>100 OR method="POST"))