CVE-2018-15723
📋 TL;DR
CVE-2018-15723 allows unauthenticated remote attackers to execute arbitrary commands on Logitech Harmony Hub devices via crafted HTTP requests. This affects all Harmony Hub devices running firmware versions before 4.15.206. Attackers can leverage this vulnerability to run system commands and potentially take full control of the device.
💻 Affected Systems
- Logitech Harmony Hub
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attackers to install persistent malware, pivot to internal networks, or use the device as part of a botnet.
Likely Case
Remote code execution leading to device takeover, unauthorized access to connected smart home devices, and potential privacy violations.
If Mitigated
Limited impact if devices are isolated from internet access and placed behind strict network segmentation.
🎯 Exploit Status
Exploitation requires only HTTP requests to the vulnerable endpoint. No authentication or special tools needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.15.206 and later
Vendor Advisory: https://www.logitech.com/en-us/product/harmony-hub
Restart Required: Yes
Instructions:
1. Open Harmony app on mobile device. 2. Navigate to Settings > Harmony Setup > Update Remote. 3. Follow prompts to update firmware to version 4.15.206 or later. 4. Device will restart automatically after update.
🔧 Temporary Workarounds
Network Isolation
allBlock Harmony Hub from internet access while maintaining local network functionality
Firewall Rules
linuxRestrict HTTP access to Harmony Hub from untrusted networks
iptables -A INPUT -p tcp --dport 8088 -s 192.168.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 8088 -j DROP
🧯 If You Can't Patch
- Place Harmony Hub on isolated VLAN separate from critical network segments
- Implement strict network access controls allowing only necessary traffic from trusted sources
🔍 How to Verify
Check if Vulnerable:
Check Harmony app Settings > About > Firmware Version. If version is below 4.15.206, device is vulnerable.Check Version:
curl -s http://[HUB_IP]:8088/harmony.system?systeminfo | grep -i versionVerify Fix Applied:
Confirm firmware version is 4.15.206 or higher in Harmony app Settings > About > Firmware Version.📡 Detection & Monitoring
Log Indicators:
- HTTP requests to /harmony.system endpoint with command parameters
- Unusual system command execution from Harmony Hub process
Network Indicators:
- HTTP POST/GET requests to port 8088 with command injection patterns
- Outbound connections from Harmony Hub to unexpected destinations
SIEM Query:
source="harmony_hub" AND (url="*harmony.system*" OR command="*systeminfo*")