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CVE-2019-7276

9.8 CRITICAL
Remote Code Execution

📋 TL;DR

CVE-2019-7276 is a critical vulnerability in Optergy Proton/Enterprise Building Management System (BMS) devices that allows remote attackers to execute arbitrary code with root privileges via a backdoor console. This affects organizations using these BMS devices for building automation and control. Attackers can gain complete control over affected systems without authentication.

💻 Affected Systems

Products:
  • Optergy Proton BMS
  • Optergy Enterprise BMS
Versions: Version 2.0.3a and likely earlier versions
Operating Systems: Embedded Linux-based systems
Default Config Vulnerable: ⚠️ Yes
Notes: Affects the web interface component of the BMS devices. The backdoor appears to be intentionally placed in the firmware.

📦 What is this software?

Enterprise by Optergy

View all CVEs affecting Enterprise →

Proton by Optergy

View all CVEs affecting Proton →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete compromise of building management systems leading to physical safety risks, data theft, ransomware deployment, and persistent backdoor access across the network.

🟠

Likely Case

Remote code execution allowing attackers to manipulate building controls, steal sensitive data, and pivot to other network systems.

🟢

If Mitigated

Limited impact if systems are isolated behind firewalls with strict network segmentation and access controls.

🌐 Internet-Facing: HIGH - Devices exposed to the internet can be directly exploited without authentication.
🏢 Internal Only: HIGH - Even internally, the vulnerability allows unauthenticated remote code execution.

🎯 Exploit Status

Public PoC: ⚠️ Yes
Weaponized: CONFIRMED
Unauthenticated Exploit: ⚠️ Yes
Complexity: LOW

Exploit code is publicly available on Packet Storm Security and other sources. The backdoor allows direct command injection without authentication.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Version 2.0.3a with security updates or later versions

Vendor Advisory: https://www.applied-risk.com/resources/ar-2019-008

Restart Required: Yes

Instructions:

1. Contact Optergy support for updated firmware. 2. Backup current configuration. 3. Apply firmware update following vendor instructions. 4. Verify the update was successful. 5. Restart the device.

🔧 Temporary Workarounds

Network Isolation

all

Isolate BMS devices from untrusted networks and the internet

Configure firewall rules to block all inbound traffic to BMS devices except from authorized management stations

Access Control Lists

linux

Restrict network access to BMS web interface

iptables -A INPUT -p tcp --dport 80 -s trusted_ip -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP

🧯 If You Can't Patch

  • Immediately isolate affected devices in a dedicated VLAN with strict firewall rules
  • Implement network monitoring and intrusion detection specifically for BMS traffic

🔍 How to Verify

Check if Vulnerable:

Check device firmware version via web interface or console. If version is 2.0.3a or earlier without security patches, assume vulnerable.

Check Version:

curl -k https://device-ip/version or check web interface system information

Verify Fix Applied:

Verify firmware version has been updated beyond 2.0.3a with security patches. Test that the backdoor console is no longer accessible.

📡 Detection & Monitoring

Log Indicators:

  • Unusual command execution in system logs
  • Access to backdoor console endpoints
  • Unexpected process creation

Network Indicators:

  • Unusual outbound connections from BMS devices
  • Traffic to known malicious IPs from BMS network
  • Port scanning originating from BMS devices

SIEM Query:

source="bms-device" AND (event="command_injection" OR url="*backdoor*" OR process="unexpected_executable")

📊 Metadata

CVE ID: CVE-2019-7276
CVSS v3 Score: 9.8 (CRITICAL)
CVSS Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: July 1, 2019
Last Updated: November 21, 2024

🔗 References

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