CVE-2023-27217
📋 TL;DR
A stack-based buffer overflow vulnerability in Belkin Smart Outlet V2's ChangeFriendlyName() function allows attackers to cause Denial of Service via crafted UPnP requests. This affects Belkin Smart Outlet V2 devices with vulnerable firmware, potentially disrupting smart home operations.
💻 Affected Systems
- Belkin Smart Outlet V2 F7c063
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device crash requiring physical reset, potential remote code execution if combined with other vulnerabilities, and persistent denial of service affecting connected devices.
Likely Case
Device becomes unresponsive, requiring manual power cycle or factory reset, disrupting smart home automation and connected appliances.
If Mitigated
Limited to temporary service interruption if network segmentation prevents UPnP access from untrusted networks.
🎯 Exploit Status
Exploitation requires sending crafted UPnP request to vulnerable device; no authentication needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch available from Belkin. Check manufacturer website for firmware updates.
🔧 Temporary Workarounds
Network Segmentation
allIsolate IoT devices on separate VLAN to prevent UPnP access from untrusted networks.
Disable UPnP
allDisable UPnP service on router/network if device functionality doesn't require it.
🧯 If You Can't Patch
- Physically disconnect device from network if not essential
- Implement strict firewall rules blocking UPnP traffic (port 1900/udp) to IoT devices
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via Belkin app or web interface; version 2.00.11420.OWRT.PVT_SNSV2 is vulnerable.Check Version:
Check via Belkin app or device web interface; no universal CLI command available.Verify Fix Applied:
Verify firmware has been updated to version newer than 2.00.11420.OWRT.PVT_SNSV2.📡 Detection & Monitoring
Log Indicators:
- Device crash logs
- UPnP service restart events
- Unusual UPnP request patterns
Network Indicators:
- Malformed UPnP packets to port 1900/udp
- Excessive UPnP traffic to IoT devices
SIEM Query:
source="iot_device" AND (event="crash" OR protocol="upnp" AND size>normal)