CVE-2023-1750
📋 TL;DR
Nexx Smart Home devices have an access control vulnerability that allows attackers with a valid device ID to access sensitive device information, modify settings, and view device history. This affects users of vulnerable NexxHome devices who haven't applied security updates. The vulnerability stems from improper authorization checks when processing device actions.
💻 Affected Systems
- Nexx Smart Home devices (specific models not detailed in advisory)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could take full control of smart home devices, disable security systems, access private device usage history, and potentially chain with other vulnerabilities for broader home network compromise.
Likely Case
Unauthorized access to device settings and history, enabling surveillance of device usage patterns and potential manipulation of device functionality.
If Mitigated
Proper access controls would limit actions to authenticated owners only, preventing unauthorized access even with device IDs.
🎯 Exploit Status
Exploitation requires valid device ID but no authentication. Device IDs may be obtainable through other attack vectors or information disclosure.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in advisory - check vendor updates
Vendor Advisory: https://www.cisa.gov/news-events/ics-advisories/icsa-23-094-01
Restart Required: Yes
Instructions:
1. Check Nexx device firmware version. 2. Update to latest firmware via Nexx mobile app. 3. Verify update completion. 4. Restart device if required by update process.
🔧 Temporary Workarounds
Network Segmentation
allIsolate smart home devices on separate VLAN or network segment
Disable Cloud Access
allConfigure devices for local-only operation if supported
🧯 If You Can't Patch
- Disconnect vulnerable devices from internet and use local-only functionality
- Monitor network traffic for unauthorized access attempts to device APIs
🔍 How to Verify
Check if Vulnerable:
Check device firmware version in Nexx mobile app against latest available versionCheck Version:
Use Nexx mobile app: Device Settings > About > Firmware VersionVerify Fix Applied:
Confirm firmware update applied successfully and test device functionality📡 Detection & Monitoring
Log Indicators:
- Unauthorized API calls to device endpoints
- Multiple failed authentication attempts followed by successful device access
Network Indicators:
- Unusual traffic patterns to Nexx cloud services
- API requests to device endpoints from unexpected IP addresses
SIEM Query:
source="nexx-device" AND (action="set_settings" OR action="get_history") AND user="unknown"