CVE-2022-25915
📋 TL;DR
This vulnerability allows an attacker on the same network who has already authenticated to bypass access controls and reach the router's management interface. It affects multiple ELECOM LAN router models with specific firmware versions, potentially exposing administrative functions to unauthorized users.
💻 Affected Systems
- WRC-1167GST2
- WRC-1167GST2A
- WRC-1167GST2H
- WRC-2533GS2-B
- WRC-2533GS2-W
- WRC-1750GS
- WRC-1750GSV
- WRC-1900GST
- WRC-2533GST
- WRC-2533GSTA
- WRC-2533GST2
- WRC-2533GST2SP
- WRC-2533GST2-G
- EDWRC-2533GST2
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
An attacker could gain full administrative control of the router, allowing them to reconfigure network settings, intercept traffic, deploy malware, or use the device as a pivot point for further attacks.
Likely Case
An authenticated attacker could access management functions they shouldn't have permission to use, potentially changing network configurations or viewing sensitive information.
If Mitigated
With proper network segmentation and strong authentication controls, the impact is limited to authorized users who might gain elevated privileges they don't need.
🎯 Exploit Status
The exploit vector is unspecified in public disclosures, suggesting limited technical details are available. Attackers need existing network access and authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Varies by model (e.g., WRC-1167GST2 firmware v1.26, WRC-2533GS2-B firmware v1.53)
Vendor Advisory: https://www.elecom.co.jp/news/security/20211130-01/
Restart Required: Yes
Instructions:
1. Identify your router model and current firmware version. 2. Visit ELECOM support website for your region. 3. Download the latest firmware for your specific model. 4. Access router admin interface. 5. Navigate to firmware update section. 6. Upload and apply the new firmware. 7. Reboot the router.
🔧 Temporary Workarounds
Network Segmentation
allIsolate router management interface to a dedicated VLAN or restrict access to trusted management hosts only.
Access Control Lists
allImplement firewall rules to restrict access to router management ports (typically 80/443) from authorized IP addresses only.
🧯 If You Can't Patch
- Implement strict network segmentation to limit which devices can communicate with the router's management interface.
- Use strong authentication mechanisms and regularly audit user accounts with access to the router.
🔍 How to Verify
Check if Vulnerable:
Check router web interface for model and firmware version, compare against affected lists in advisory.Check Version:
Access router web interface → System Information or similar section to view firmware version.Verify Fix Applied:
After updating, verify firmware version in admin interface matches or exceeds patched versions listed in advisory.📡 Detection & Monitoring
Log Indicators:
- Unusual authentication attempts to router management interface
- Access from unexpected IP addresses to admin pages
- Configuration changes from non-admin users
Network Indicators:
- Unexpected traffic to router management ports (80/443) from non-management hosts
- Multiple failed authentication attempts followed by successful access
SIEM Query:
source_ip IN (non-management_subnets) AND dest_port IN (80,443) AND dest_ip = router_ip AND http_user_agent CONTAINS 'admin'