CVE-2021-38482
📋 TL;DR
This stored cross-site scripting vulnerability in InHand Networks IR615 Router's web interface allows attackers to inject malicious scripts that execute when users visit the compromised pages. Attackers can hijack user sessions, potentially gaining unauthorized access to router administration. 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 router compromise allowing attacker to reconfigure network settings, intercept traffic, or use router as pivot point into internal network.
Likely Case
Session hijacking leading to unauthorized router configuration changes, credential theft, or malware distribution to users accessing router interface.
If Mitigated
Limited impact with proper network segmentation and user awareness training, though router remains vulnerable to exploitation.
🎯 Exploit Status
Stored XSS typically requires some level of access to inject payloads, but once stored, exploitation is straightforward.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor for latest firmware updates
Vendor Advisory: https://us-cert.cisa.gov/ics/advisories/icsa-21-280-05
Restart Required: Yes
Instructions:
1. Check InHand Networks website for firmware updates. 2. Download latest firmware. 3. Access router admin interface. 4. Navigate to firmware update section. 5. Upload and apply new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable Web Interface
allDisable router web management interface if not required
Access router CLI via SSH/Telnet
Disable web interface using vendor-specific commands
Network Segmentation
allRestrict access to router management interface
Configure firewall rules to limit access to router IP
Implement VLAN segmentation
🧯 If You Can't Patch
- Implement strict input validation and output encoding on web interface
- Deploy WAF with XSS protection rules in front of router interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via admin interface or CLI commandsCheck Version:
Check via router web interface or use vendor-specific CLI commandsVerify Fix Applied:
Verify firmware version is updated beyond vulnerable versions and test XSS payloads📡 Detection & Monitoring
Log Indicators:
- Unusual script tags in web interface logs
- Multiple failed login attempts followed by successful access
Network Indicators:
- Unusual HTTP requests containing script payloads to router interface
- Traffic patterns indicating session hijacking
SIEM Query:
source="router_logs" AND ("script" OR "javascript" OR "onload" OR "onerror")