CVE-2022-21182
📋 TL;DR
This vulnerability allows attackers to escalate privileges on InHand Networks InRouter302 devices by sending specially crafted HTTP requests to the router configuration import functionality. Attackers can gain administrative access to affected routers. This affects organizations using InRouter302 V3.5.4 devices.
💻 Affected Systems
- InHand Networks InRouter302
📦 What is this software?
Inrouter302 Firmware by Inhandnetworks
⚠️ Risk & Real-World Impact
Worst Case
Full administrative control of router, enabling traffic interception, network disruption, and lateral movement into connected networks.
Likely Case
Unauthorized administrative access to router configuration, allowing network manipulation and data interception.
If Mitigated
Limited impact if proper network segmentation and access controls prevent external access to router management interfaces.
🎯 Exploit Status
Exploit requires sending crafted HTTP requests to the configuration import endpoint. No authentication bypass needed if attacker already has some access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: V3.5.5 or later
Vendor Advisory: https://www.inhandnetworks.com/upload/attachment/202205/10/InHand-PSA-2022-01.pdf
Restart Required: Yes
Instructions:
1. Download latest firmware from InHand Networks support portal. 2. Backup current configuration. 3. Upload and install firmware update via web interface. 4. Restart router. 5. Verify version is V3.5.5 or later.
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to router management interface
Configure firewall to block external access to router management ports (typically 80/443)
Restrict management access
allLimit management interface access to trusted IPs only
Configure router ACL to allow management access only from specific IP ranges
🧯 If You Can't Patch
- Isolate router management interface on separate VLAN with strict access controls
- Implement network monitoring for unusual HTTP requests to configuration import endpoints
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface or CLI. If version is V3.5.4, device is vulnerable.Check Version:
Login to router web interface and check System Information page, or use CLI command: show versionVerify Fix Applied:
Verify firmware version is V3.5.5 or later after update. Test configuration import functionality with normal operations.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP POST requests to /cgi-bin/luci/ or configuration import endpoints
- Multiple failed authentication attempts followed by configuration import requests
- Configuration changes from unexpected source IPs
Network Indicators:
- HTTP traffic to router management interface containing crafted import requests
- Unusual outbound traffic patterns after configuration changes
SIEM Query:
source_ip=router_management_interface AND (uri_path CONTAINS "/cgi-bin/luci/" OR uri_path CONTAINS "import") AND http_method="POST"