CVE-2023-43752
📋 TL;DR
This CVE describes an OS command injection vulnerability in specific ELECOM wireless router models. An authenticated attacker on the same network can execute arbitrary operating system commands by sending specially crafted requests. This affects users of WRC-X3000GS2-W, WRC-X3000GS2-B, and WRC-X3000GS2A-B routers running vulnerable firmware versions.
💻 Affected Systems
- ELECOM WRC-X3000GS2-W
- ELECOM WRC-X3000GS2-B
- ELECOM WRC-X3000GS2A-B
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full router compromise allowing attacker to install persistent backdoors, intercept all network traffic, pivot to internal systems, or use the router for botnet activities.
Likely Case
Router configuration manipulation, credential theft, network reconnaissance, and potential lateral movement to connected devices.
If Mitigated
Limited impact if network segmentation prevents lateral movement and strong authentication controls are in place.
🎯 Exploit Status
Exploitation requires authenticated access but command injection vulnerabilities are typically straightforward to exploit once the injection point is identified.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v1.06 or later
Vendor Advisory: https://www.elecom.co.jp/news/security/20231114-01/
Restart Required: Yes
Instructions:
1. Log into router admin interface. 2. Navigate to firmware update section. 3. Download latest firmware from ELECOM website. 4. Upload and apply firmware update. 5. Reboot router after update completes.
🔧 Temporary Workarounds
Network Segmentation
allIsolate router management interface to dedicated VLAN with strict access controls
Access Restriction
allImplement IP whitelisting for router management interface and use strong authentication
🧯 If You Can't Patch
- Implement strict network segmentation to isolate router management interface
- Enable logging and monitoring for suspicious router configuration changes
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via admin interface or SSH if enabledCheck Version:
Check via router web interface at 192.168.2.1 or configured IPVerify Fix Applied:
Confirm firmware version is v1.06 or later in router admin interface📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in router logs
- Multiple failed authentication attempts followed by configuration changes
- Unexpected firmware or configuration modifications
Network Indicators:
- Unusual outbound connections from router
- Suspicious traffic patterns from router management interface
- Unexpected DNS queries from router
SIEM Query:
source="router_logs" AND (command="*;*" OR command="*|*" OR command="*`*" OR command="*$(*")