CVE-2020-28215
📋 TL;DR
CVE-2020-28215 is a missing authorization vulnerability in Schneider Electric's Easergy T300 firmware that allows attackers to bypass access controls. This could lead to information disclosure, denial of service, or remote code execution. Organizations using Easergy T300 devices with firmware version 2.7 or older are affected.
💻 Affected Systems
- Schneider Electric Easergy T300
📦 What is this software?
Easergy T300 Firmware by Schneider Electric
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain full control of the device, execute arbitrary code, disrupt power grid operations, and potentially pivot to other critical infrastructure systems.
Likely Case
Unauthorized access leading to information disclosure about grid configurations and potential denial of service affecting power monitoring capabilities.
If Mitigated
Limited impact with proper network segmentation and access controls preventing external exploitation, though internal threats remain possible.
🎯 Exploit Status
The vulnerability allows bypassing authorization checks, making exploitation straightforward once access is obtained. No public exploit code has been released, but the nature of the vulnerability suggests it could be weaponized.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware version 2.8 or newer
Vendor Advisory: https://www.se.com/ww/en/download/document/SEVD-2020-315-06/
Restart Required: Yes
Instructions:
1. Download firmware version 2.8 or newer from Schneider Electric's website. 2. Follow the firmware update procedure outlined in the Easergy T300 user manual. 3. Verify the firmware version after update. 4. Test device functionality post-update.
🔧 Temporary Workarounds
Network Segmentation
allIsolate Easergy T300 devices in dedicated network segments with strict firewall rules
Access Control Lists
allImplement strict network access controls allowing only authorized management systems to communicate with devices
🧯 If You Can't Patch
- Implement strict network segmentation to isolate devices from untrusted networks
- Deploy intrusion detection systems to monitor for unauthorized access attempts
🔍 How to Verify
Check if Vulnerable:
Check the firmware version via the device web interface or management software. If version is 2.7 or older, the device is vulnerable.Check Version:
Use the device web interface or Schneider Electric's management software to check firmware versionVerify Fix Applied:
After updating, verify firmware version shows 2.8 or newer in the device interface.📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts to device management interfaces
- Unexpected firmware version changes
- Unusual network connections to device ports
Network Indicators:
- Unusual traffic patterns to/from Easergy T300 devices
- Connection attempts from unauthorized IP addresses
- Protocol anomalies in device communications
SIEM Query:
source="easergy_t300" AND (event_type="unauthorized_access" OR event_type="firmware_change")