CVE-2022-28583
📋 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 setWiFiWpsCfg interface by sending specially crafted payloads. This affects TOTOlink A7100RU router users running vulnerable firmware versions.
💻 Affected Systems
- TOTOlink A7100RU
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attacker to install persistent backdoors, intercept all network traffic, pivot to internal networks, and use the router for botnet activities.
Likely Case
Router takeover leading to network traffic interception, DNS hijacking, credential theft, and denial of service.
If Mitigated
Limited impact if router is behind firewall with restricted WAN access and proper network segmentation.
🎯 Exploit Status
Exploit requires authentication to the router's web interface. Public proof-of-concept code exists in GitHub repositories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check TOTOlink website for firmware updates
2. Download latest firmware for A7100RU
3. Access router admin interface
4. Navigate to firmware update section
5. Upload and apply new firmware
6. Reboot router
🔧 Temporary Workarounds
Disable WPS functionality
allDisable WiFi Protected Setup (WPS) feature to remove vulnerable interface
Restrict admin interface access
allLimit access to router admin interface to trusted IP addresses only
🧯 If You Can't Patch
- Place router behind firewall with strict inbound rules
- Disable remote administration and WAN access to admin interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System Status or Firmware Update sectionCheck Version:
Login to router web interface and navigate to System Information pageVerify Fix Applied:
Verify firmware version has been updated to a version newer than v7.4cu.2313_b20191024📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /cgi-bin/cstecgi.cgi with setWiFiWpsCfg parameters
- Suspicious command execution in system logs
Network Indicators:
- Unusual outbound connections from router
- DNS queries to suspicious domains
SIEM Query:
source="router_logs" AND (uri="/cgi-bin/cstecgi.cgi" AND params CONTAINS "setWiFiWpsCfg")