CVE-2023-24500
📋 TL;DR
An adjacent attacker can upload unauthorized firmware to Electra Central AC units, potentially gaining control over the device. This affects Electra Central AC units in environments where attackers have network adjacency to the vulnerable device.
💻 Affected Systems
- Electra Central AC unit
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attacker gains complete control of the AC unit, potentially using it as a foothold into the building management network or causing physical damage through manipulated HVAC operations.
Likely Case
Attacker installs malicious firmware that disables the AC unit, disrupts climate control, or enables further network reconnaissance.
If Mitigated
With proper network segmentation and access controls, impact is limited to the isolated HVAC network segment.
🎯 Exploit Status
CWE-494 indicates download of code without integrity check, suggesting straightforward exploitation once network access is obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified
Vendor Advisory: https://www.gov.il/en/Departments/faq/cve_advisories
Restart Required: No
Instructions:
Check vendor advisory for firmware updates. If available, download from official source and follow vendor's firmware update procedures.
🔧 Temporary Workarounds
Network Segmentation
allIsolate HVAC devices on separate VLAN with strict access controls
Physical Access Controls
allRestrict physical access to network ports and AC unit interfaces
🧯 If You Can't Patch
- Implement strict network segmentation to isolate HVAC devices from general network traffic
- Monitor network traffic to/from AC units for unauthorized firmware upload attempts
🔍 How to Verify
Check if Vulnerable:
Check if AC unit accepts firmware uploads without authentication or integrity verification from adjacent network devicesCheck Version:
Consult device interface or vendor documentation for firmware version check procedureVerify Fix Applied:
Test if firmware upload requires authentication and verify firmware integrity checks are implemented📡 Detection & Monitoring
Log Indicators:
- Unexpected firmware update events
- Network connections to AC unit from unauthorized sources
Network Indicators:
- Firmware upload traffic to AC unit IP addresses
- Unexpected protocols or ports to HVAC devices
SIEM Query:
source_ip IN (HVAC_network_range) AND (event_type='firmware_update' OR protocol='tftp' OR protocol='http_upload')