CVE-2023-27917
📋 TL;DR
This CVE describes an OS command injection vulnerability in CONPROSYS IoT Gateway products that allows remote authenticated attackers with access to the Network Maintenance page to execute arbitrary operating system commands with root privileges. The vulnerability affects multiple M2M Gateway and Controller products with specific firmware versions. Attackers can gain complete control over affected devices.
💻 Affected Systems
- CONPROSYS M2M Gateway
- CONPROSYS M2M Controller Integrated Type
- CONPROSYS M2M Controller Configurable Type
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attackers to install persistent backdoors, pivot to internal networks, exfiltrate sensitive data, or use devices as part of botnets for DDoS attacks or cryptocurrency mining.
Likely Case
Attackers gain root access to affected devices, enabling them to modify configurations, disrupt operations, steal credentials, or use devices as footholds for lateral movement within the network.
If Mitigated
With proper network segmentation and access controls, impact is limited to the affected device only, preventing lateral movement to other systems.
🎯 Exploit Status
Exploitation requires authenticated access but is straightforward once authentication is achieved. The vulnerability is in the Network Maintenance functionality.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: M2M Gateway: firmware newer than Ver.3.7.10; M2M Controller Integrated Type: firmware newer than Ver.3.7.6; M2M Controller Configurable Type: firmware newer than Ver.3.8.8
Vendor Advisory: https://www.contec.com/api/downloadlogger?download=/-/media/Contec/jp/support/security-info/contec_security_cps_230317_en.pdf
Restart Required: Yes
Instructions:
1. Download appropriate firmware from Contec download portal. 2. Backup current configuration. 3. Upload and apply firmware update through device web interface. 4. Reboot device. 5. Verify firmware version is updated.
🔧 Temporary Workarounds
Restrict Network Maintenance Page Access
allLimit access to the Network Maintenance page using network access controls or web application firewalls
Network Segmentation
allIsolate affected devices in separate network segments with strict firewall rules
🧯 If You Can't Patch
- Implement strict network segmentation to isolate affected devices from critical systems
- Enforce strong authentication and limit user access to only necessary personnel
🔍 How to Verify
Check if Vulnerable:
Check device firmware version through web interface or SSH. If version matches affected ranges, device is vulnerable.Check Version:
Check via web interface: System Information page or via SSH: cat /proc/version or check firmware version in device settingsVerify Fix Applied:
Verify firmware version is updated beyond affected versions: M2M Gateway > 3.7.10, M2M Controller Integrated Type > 3.7.6, M2M Controller Configurable Type > 3.8.8📡 Detection & Monitoring
Log Indicators:
- Unusual command execution patterns
- Multiple failed authentication attempts followed by successful login
- Unexpected system configuration changes
- Suspicious processes running with root privileges
Network Indicators:
- Unusual outbound connections from IoT devices
- Traffic to unexpected destinations
- Protocol anomalies in device communications
SIEM Query:
source="iot-gateway" AND (event_type="command_execution" OR user="root" AND action="config_change")🔗 References
- https://jvn.jp/en/vu/JVNVU96198617/
- https://www.contec.com/api/downloadlogger?download=/-/media/Contec/jp/support/security-info/contec_security_cps_230317_en.pdf
- https://www.contec.com/download/donwload-list/?itemid=a054b3eb-da97-40d0-9598-d7f5ff4239ec#firmware
- https://www.contec.com/download/donwload-list/?itemid=a1b33f0d-d32b-4549-9741-613cd37d5528#firmware
- https://www.contec.com/download/donwload-list/?itemid=f832c526-dcf6-4976-85aa-f536c15a8120#firmware
- https://jvn.jp/en/vu/JVNVU96198617/
- https://www.contec.com/api/downloadlogger?download=/-/media/Contec/jp/support/security-info/contec_security_cps_230317_en.pdf
- https://www.contec.com/download/donwload-list/?itemid=a054b3eb-da97-40d0-9598-d7f5ff4239ec#firmware
- https://www.contec.com/download/donwload-list/?itemid=a1b33f0d-d32b-4549-9741-613cd37d5528#firmware
- https://www.contec.com/download/donwload-list/?itemid=f832c526-dcf6-4976-85aa-f536c15a8120#firmware
