CVE-2021-38484
📋 TL;DR
This vulnerability allows attackers with administrator access to upload malicious files to InHand Networks IR615 routers without proper validation. This can lead to cross-site scripting, file deletion, or remote code execution. Organizations using affected router versions are at risk.
💻 Affected Systems
- InHand Networks IR615 Router
📦 What is this software?
Ir615 Firmware by Inhandnetworks
Ir615 Firmware by Inhandnetworks
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise via remote code execution, allowing attacker to control the router, intercept network traffic, and pivot to internal networks.
Likely Case
Malicious file upload leading to cross-site scripting attacks against router management interface users or deletion of critical system files.
If Mitigated
Limited impact if proper network segmentation, admin access controls, and file upload restrictions are implemented.
🎯 Exploit Status
Exploitation requires admin credentials but is straightforward once authenticated due to lack of file validation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 2.3.0.r4870 or later (check vendor for specific fixed version)
Vendor Advisory: https://us-cert.cisa.gov/ics/advisories/icsa-21-280-05
Restart Required: Yes
Instructions:
1. Contact InHand Networks for updated firmware. 2. Backup router configuration. 3. Upload and install patched firmware via web interface. 4. Reboot router. 5. Verify version update.
🔧 Temporary Workarounds
Restrict Admin Access
allLimit administrative access to trusted IP addresses only
Configure firewall rules to restrict access to router management interface from specific IPs
Disable Unnecessary File Upload
allDisable file upload functionality if not required
Check router configuration for file upload settings and disable if possible
🧯 If You Can't Patch
- Implement strict network segmentation to isolate router from critical systems
- Enforce strong authentication and limit admin accounts to essential personnel only
🔍 How to Verify
Check if Vulnerable:
Check router web interface or CLI for firmware version. If version is 2.3.0.r4724 or 2.3.0.r4870, device is vulnerable.Check Version:
Check via web interface: System > Firmware Information or via CLI: show versionVerify Fix Applied:
After patching, verify firmware version is newer than 2.3.0.r4870 and test file upload functionality with malicious file patterns.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to router management interface
- Multiple failed login attempts followed by successful admin login
- Unexpected system file modifications
Network Indicators:
- Unusual outbound connections from router
- Traffic patterns indicating command and control activity
- Port scanning originating from router
SIEM Query:
source="router_logs" AND (event="file_upload" OR event="admin_login") AND status="success"