CVE-2017-11563
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code with root privileges on D-Link EyeOn Baby Monitor devices by sending a specially crafted UDP packet to the 'finderd' service. The exploit requires no authentication and can be performed over the network. All users of affected D-Link DCS-825L baby monitors running vulnerable firmware are at risk.
💻 Affected Systems
- D-Link EyeOn Baby Monitor DCS-825L
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attacker to install persistent malware, access camera feed, pivot to internal network, or brick the device.
Likely Case
Attacker gains full control of baby monitor, can view camera feed, modify device settings, and use device as foothold for further attacks.
If Mitigated
Device isolated from internet with strict network segmentation prevents remote exploitation.
🎯 Exploit Status
Exploit code is publicly available in security advisories. Attack requires sending a single UDP packet to trigger stack overflow.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware version 1.09.1 or later
Vendor Advisory: https://support.dlink.com/security/
Restart Required: Yes
Instructions:
1. Download latest firmware from D-Link support site. 2. Log into device web interface. 3. Navigate to System > Firmware Update. 4. Upload firmware file. 5. Wait for automatic reboot.
🔧 Temporary Workarounds
Network Isolation
linuxBlock UDP port 5978 at network perimeter and isolate device on separate VLAN
iptables -A INPUT -p udp --dport 5978 -j DROP
Service Disablement
linuxDisable the finderd service if device functionality allows
killall finderd
chmod -x /usr/bin/finderd
🧯 If You Can't Patch
- Disconnect device from internet and use only on isolated local network
- Implement strict firewall rules blocking all inbound traffic to device except essential ports
🔍 How to Verify
Check if Vulnerable:
Check if UDP port 5978 is open and responding to discovery requests: 'nc -u -z [device_ip] 5978'Check Version:
Check web interface at http://[device_ip]/ or use 'curl http://[device_ip]/info' if availableVerify Fix Applied:
Verify firmware version is 1.09.1 or later in web interface and port 5978 no longer responds to malformed packets📡 Detection & Monitoring
Log Indicators:
- Unexpected process crashes (finderd)
- Large UDP packets to port 5978 in system logs
Network Indicators:
- UDP packets > 1024 bytes to port 5978
- Multiple connection attempts to port 5978 from single source
SIEM Query:
source_port=5978 AND packet_size>1024 OR dest_port=5978 AND protocol=UDP AND packet_size>1024