CVE-2023-31193
📋 TL;DR
Snap One OvrC Pro devices prior to version 7.3 download programs over unencrypted HTTP connections instead of HTTPS, making them vulnerable to man-in-the-middle attacks. This affects all OvrC Pro devices running versions before 7.3, potentially allowing attackers to intercept and modify software updates.
💻 Affected Systems
- Snap One OvrC Pro
📦 What is this software?
Orvc by Snapone
⚠️ Risk & Real-World Impact
Worst Case
Attackers could intercept program downloads and replace them with malicious code, gaining full control of OvrC Pro devices and potentially compromising connected smart home/industrial systems.
Likely Case
Man-in-the-middle attackers could intercept and modify program downloads, leading to unauthorized code execution on OvrC Pro devices.
If Mitigated
With proper network segmentation and monitoring, impact is limited to potential service disruption or unauthorized access to the OvrC Pro device itself.
🎯 Exploit Status
Exploitation requires man-in-the-middle position on network path between OvrC Pro device and update servers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 7.3
Vendor Advisory: https://www.control4.com/docs/product/ovrc-software/release-notes/english/latest/ovrc-software-release-notes-rev-p.pdf
Restart Required: Yes
Instructions:
1. Log into OvrC Pro web interface. 2. Navigate to System > Software Update. 3. Check for and install version 7.3 or later. 4. Reboot device after installation completes.
🔧 Temporary Workarounds
Network Segmentation
allIsolate OvrC Pro devices on separate VLANs with strict egress filtering to prevent man-in-the-middle attacks.
Outbound Firewall Rules
allBlock all outbound HTTP traffic from OvrC Pro devices, forcing them to fail closed rather than use insecure connections.
🧯 If You Can't Patch
- Segment OvrC Pro devices on isolated network segments with no internet access
- Implement network monitoring for HTTP traffic from OvrC Pro devices to detect potential exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check OvrC Pro web interface > System > About for software version. If version is below 7.3, device is vulnerable.Check Version:
curl -s http://[ovrc-ip]/api/v1/system/info | grep versionVerify Fix Applied:
After updating, verify version is 7.3 or higher in System > About. Monitor network traffic to confirm HTTPS connections to update servers.📡 Detection & Monitoring
Log Indicators:
- HTTP connections to update servers (instead of HTTPS)
- Failed update attempts after blocking HTTP
Network Indicators:
- HTTP traffic to Snap One/Control4 update servers from OvrC Pro devices
- Unencrypted program downloads
SIEM Query:
source_ip=[ovrc-device-ip] AND dest_port=80 AND (dest_ip contains 'control4.com' OR dest_ip contains 'snapone.com')🔗 References
- https://www.cisa.gov/news-events/ics-advisories/icsa-23-136-01
- https://www.control4.com/docs/product/ovrc-software/release-notes/english/latest/ovrc-software-release-notes-rev-p.pdf
- https://www.cisa.gov/news-events/ics-advisories/icsa-23-136-01
- https://www.control4.com/docs/product/ovrc-software/release-notes/english/latest/ovrc-software-release-notes-rev-p.pdf
