CVE-2021-20074
📋 TL;DR
CVE-2021-20074 allows authenticated users to escape the command line interface in Racom's MIDGE Firmware and execute arbitrary operating system commands. This affects organizations using Racom MIDGE devices with vulnerable firmware versions. Attackers can gain full system control through command injection.
💻 Affected Systems
- Racom MIDGE Firmware
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to install malware, pivot to other network segments, exfiltrate sensitive data, or render the device inoperable.
Likely Case
Attackers gain administrative control of the MIDGE device, allowing them to modify configurations, intercept network traffic, or use the device as a foothold for further attacks.
If Mitigated
Limited impact if network segmentation, strict access controls, and monitoring are in place to contain potential breaches.
🎯 Exploit Status
Exploitation requires authenticated access but is straightforward once credentials are obtained. Public technical details are available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 4.4.40.105
Vendor Advisory: https://www.racom.eu/eng/products/m/midge.html
Restart Required: Yes
Instructions:
1. Contact Racom for updated firmware. 2. Backup device configuration. 3. Upload and install the patched firmware version. 4. Reboot the device. 5. Verify the new firmware version is running.
🔧 Temporary Workarounds
Restrict CLI Access
allLimit command line interface access to only trusted administrators using network segmentation and strict access controls.
Implement Strong Authentication
allEnforce complex passwords, multi-factor authentication, and account lockout policies for all administrative accounts.
🧯 If You Can't Patch
- Isolate vulnerable devices in a separate network segment with strict firewall rules limiting inbound and outbound connections.
- Implement comprehensive logging and monitoring for suspicious CLI activity and command execution attempts.
🔍 How to Verify
Check if Vulnerable:
Check the firmware version via the device web interface or CLI using the version command. If it shows 4.4.40.105, the device is vulnerable.Check Version:
Check via web interface or use device-specific CLI commands to display firmware version.Verify Fix Applied:
After patching, verify the firmware version is no longer 4.4.40.105. Test that command injection attempts are properly blocked.📡 Detection & Monitoring
Log Indicators:
- Unusual CLI access patterns
- Execution of system commands from CLI
- Multiple failed authentication attempts followed by successful login
Network Indicators:
- Unexpected outbound connections from MIDGE devices
- Traffic to suspicious external IPs
SIEM Query:
Search for events where source device is MIDGE and contains command execution patterns or unusual authentication events.