CVE-2023-37566
📋 TL;DR
This CVE describes a command injection vulnerability in ELECOM and LOGITEC wireless LAN routers that allows authenticated attackers on the same network to execute arbitrary commands via specially crafted web requests to the management interface. The vulnerability affects multiple router models across various firmware versions, potentially compromising network security and device integrity.
💻 Affected Systems
- ELECOM WRC-1167GHBK3-A
- ELECOM WRC-1167FEBK-A
- ELECOM WRC-F1167ACF2
- ELECOM WRC-600GHBK-A
- ELECOM WRC-733FEBK2-A
- ELECOM WRC-1467GHBK-A
- ELECOM WRC-1900GHBK-A
- LOGITEC LAN-W301NR
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete router compromise leading to network takeover, credential theft, malware deployment, and persistent backdoor installation.
Likely Case
Router configuration manipulation, network traffic interception, and lateral movement to other devices on the network.
If Mitigated
Limited impact due to network segmentation, strong authentication, and restricted management interface access.
🎯 Exploit Status
Exploitation requires authenticated access to the web management interface, but the command injection mechanism appears straightforward once authenticated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: WRC-1167GHBK3-A v1.25+, WRC-1167FEBK-A v1.19+
Vendor Advisory: https://www.elecom.co.jp/news/security/20230711-01/
Restart Required: Yes
Instructions:
1. Log into router web interface. 2. Navigate to firmware update section. 3. Download latest firmware from vendor website. 4. Upload and apply firmware update. 5. Reboot router after update completes.
🔧 Temporary Workarounds
Disable Web Management Interface
allDisable the web-based management interface to prevent exploitation attempts
Router-specific configuration commands vary by model
Restrict Management Interface Access
allLimit web management interface access to specific trusted IP addresses only
Router-specific access control configuration
🧯 If You Can't Patch
- Segment affected routers on isolated network segments
- Implement strict network access controls and monitor for suspicious management interface activity
🔍 How to Verify
Check if Vulnerable:
Check router model and firmware version against affected products listCheck Version:
Check router web interface status page or use telnet/SSH if availableVerify Fix Applied:
Verify firmware version has been updated to patched version📡 Detection & Monitoring
Log Indicators:
- Unusual web management interface access patterns
- Suspicious command execution attempts in router logs
- Multiple failed authentication attempts followed by successful login
Network Indicators:
- Unusual outbound connections from router
- Suspicious traffic patterns from router management interface
SIEM Query:
Search for web requests containing command injection patterns to router management IP addresses