CVE-2022-28581
📋 TL;DR
This CVE describes a command injection vulnerability in TOTOlink A7100RU routers that allows attackers to execute arbitrary commands on the device. Attackers can exploit the setWiFiAdvancedCfg interface by sending specially crafted payloads. This affects users of TOTOlink A7100RU routers with vulnerable firmware versions.
💻 Affected Systems
- TOTOlink A7100RU router
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the router allowing attackers to intercept all network traffic, install persistent backdoors, pivot to internal network devices, and use the router for botnet activities.
Likely Case
Router compromise leading to DNS hijacking, credential theft from network traffic, and use as a proxy for malicious activities.
If Mitigated
Limited impact if the router is behind a firewall with strict inbound rules and network segmentation prevents lateral movement.
🎯 Exploit Status
Public proof-of-concept code exists in GitHub repositories. The vulnerability requires no authentication and has a simple exploitation path.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No vendor advisory found
Restart Required: Yes
Instructions:
1. Check TOTOlink website for firmware updates
2. If update available, download and verify checksum
3. Access router admin interface
4. Navigate to firmware update section
5. Upload new firmware file
6. Wait for router to reboot
🔧 Temporary Workarounds
Disable remote administration
allPrevent external access to router administration interface
Network segmentation
allIsolate router management interface to separate VLAN
🧯 If You Can't Patch
- Replace router with a different model that receives security updates
- Place router behind a firewall with strict inbound rules blocking all unnecessary ports
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface. If version is v7.4cu.2313_b20191024, device is vulnerable.Check Version:
Check router web interface at http://[router-ip]/ or use nmap to identify device versionVerify Fix Applied:
Verify firmware version has changed from vulnerable version after update.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to setWiFiAdvancedCfg endpoint
- Unexpected command execution in system logs
- Multiple failed login attempts followed by successful access
Network Indicators:
- Unusual outbound connections from router
- DNS queries to suspicious domains
- Traffic patterns indicating command and control communication
SIEM Query:
source="router_logs" AND (uri="/setWiFiAdvancedCfg" OR command="*;*" OR command="*|*")