CVE-2024-34577
📋 TL;DR
This cross-site scripting (XSS) vulnerability in Elecom WRC-X3000GS2 series routers allows attackers to execute arbitrary JavaScript in the admin interface when logged-in users view malicious web pages. The vulnerability affects users who access the router's web administration panel while authenticated. Attackers could steal session cookies, redirect users, or perform unauthorized actions.
💻 Affected Systems
- WRC-X3000GS2-B
- WRC-X3000GS2-W
- WRC-X3000GS2A-B
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete router compromise allowing attacker to change router configuration, intercept network traffic, install backdoors, or use router as pivot point into internal network.
Likely Case
Session hijacking leading to unauthorized router configuration changes, network disruption, or credential theft from admin interface.
If Mitigated
Limited impact with proper network segmentation and admin interface access restrictions, though XSS could still affect authenticated users.
🎯 Exploit Status
Exploitation requires user interaction (viewing malicious page) while authenticated to router admin interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware update from vendor
Vendor Advisory: https://www.elecom.co.jp/news/security/20240827-01/
Restart Required: Yes
Instructions:
1. Download latest firmware from Elecom support site. 2. Log into router admin interface. 3. Navigate to firmware update section. 4. Upload and apply firmware update. 5. Reboot router after update completes.
🔧 Temporary Workarounds
Restrict admin interface access
allLimit access to router admin interface to specific trusted IP addresses only
Configure firewall rules to restrict access to router admin port (typically 80/443) to management network only
Use separate admin browser
allUse dedicated browser or incognito mode only for router administration
🧯 If You Can't Patch
- Segment router management interface to isolated VLAN with strict access controls
- Implement web application firewall (WAF) with XSS protection rules
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router admin interface under System InformationCheck Version:
Check via web interface: System > Firmware InformationVerify Fix Applied:
Verify firmware version matches patched version from vendor advisory📡 Detection & Monitoring
Log Indicators:
- Unusual access patterns to easysetup.cgi
- Multiple failed login attempts followed by successful login
Network Indicators:
- HTTP requests containing suspicious script tags or JavaScript in easysetup.cgi parameters
- Outbound connections from router to unexpected destinations
SIEM Query:
source="router_logs" AND (uri="*easysetup.cgi*" AND (query="*<script>*" OR query="*javascript:*"))