CVE-2022-27279
📋 TL;DR
CVE-2022-27279 is an arbitrary file read vulnerability in InHand Networks InRouter 900 Industrial 4G Router firmware. It allows attackers to read sensitive files from the device filesystem without authentication. This affects organizations using InRouter 900 routers in industrial, manufacturing, or critical infrastructure environments.
💻 Affected Systems
- InHand Networks InRouter 900 Industrial 4G Router
📦 What is this software?
Inrouter 900 Firmware by Inhandnetworks
⚠️ Risk & Real-World Impact
Worst Case
Attackers could read configuration files containing credentials, cryptographic keys, or sensitive network information, potentially leading to full device compromise and lateral movement into connected industrial networks.
Likely Case
Unauthenticated attackers reading device configuration files to obtain credentials for further attacks or reconnaissance of the industrial network.
If Mitigated
If proper network segmentation and access controls are implemented, impact is limited to the router itself with minimal risk to connected industrial systems.
🎯 Exploit Status
Public proof-of-concept code exists in GitHub repositories. Exploitation requires network access to the router's web interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v1.0.0.r11700 and later
Vendor Advisory: https://www.inhandnetworks.com/
Restart Required: Yes
Instructions:
1. Download firmware v1.0.0.r11700 or later from InHand Networks support portal. 2. Log into router web interface. 3. Navigate to System > Firmware Upgrade. 4. Upload new firmware file. 5. Wait for upgrade to complete and router to reboot.
🔧 Temporary Workarounds
Network Access Restriction
allRestrict access to router management interface to trusted IP addresses only
Configure firewall rules to allow only specific source IPs to access router management ports (typically 80/443)
Management Interface Disablement
linuxDisable web management interface if not required
Use CLI to disable web interface: system disable-web-interface
🧯 If You Can't Patch
- Isolate router on separate VLAN with strict firewall rules preventing external access
- Implement network monitoring for unusual file access patterns to router management interface
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface at System > Status or via SSH using 'cat /etc/version' commandCheck Version:
ssh admin@router-ip 'cat /etc/version' or check web interface System > Status pageVerify Fix Applied:
Confirm firmware version is v1.0.0.r11700 or later and test file read functionality is no longer accessible📡 Detection & Monitoring
Log Indicators:
- Unusual file access patterns in router logs
- Multiple failed authentication attempts followed by file read requests
Network Indicators:
- HTTP requests to router management interface with file path traversal patterns
- Unusual outbound connections from router after exploitation
SIEM Query:
source="router-logs" AND (url="*../*" OR url="*/etc/*" OR url="*/proc/*")🔗 References
- https://drive.google.com/drive/folders/1MPtl6pGa7GMIT1-jg69YUGSQdVTfbnay?usp=sharing
- https://github.com/wu610777031/IoT_Hunter/blob/main/Inhand%20InRouter%20900%20Industrial%204G%20Router%20%20Vulnerabilities%28Arbitrary%20File%20Deletion%20and%20Read%29.pdf
- https://drive.google.com/drive/folders/1MPtl6pGa7GMIT1-jg69YUGSQdVTfbnay?usp=sharing
- https://github.com/wu610777031/IoT_Hunter/blob/main/Inhand%20InRouter%20900%20Industrial%204G%20Router%20%20Vulnerabilities%28Arbitrary%20File%20Deletion%20and%20Read%29.pdf
