CVE-2022-26212
📋 TL;DR
This CVE describes a command injection vulnerability in multiple Totolink router models that allows attackers to execute arbitrary commands via the setDeviceName function. Attackers can exploit this by sending crafted requests containing malicious commands in the deviceMac or deviceName parameters. Users of affected Totolink router models are at risk.
💻 Affected Systems
- Totolink A830R
- Totolink A3100R
- Totolink A950RG
- Totolink A800R
- Totolink A3000RU
- Totolink A810R
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the router allowing attackers to install persistent backdoors, intercept all network traffic, pivot to internal networks, and use the device for botnet activities.
Likely Case
Remote code execution leading to router compromise, network traffic interception, DNS hijacking, and credential theft from connected devices.
If Mitigated
Limited impact with proper network segmentation, but still potential for router compromise if exposed to attackers.
🎯 Exploit Status
Public proof-of-concept code exists in GitHub repositories. The vulnerability requires no authentication and has simple exploitation vectors via HTTP requests.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No official vendor advisory found
Restart Required: Yes
Instructions:
1. Check Totolink website for firmware updates for your specific model. 2. Download the latest firmware. 3. Access router admin interface. 4. Navigate to firmware upgrade section. 5. Upload and apply the new firmware. 6. Reboot the router.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router management interface
Access router admin panel -> System Tools -> Remote Management -> Disable
Network Segmentation
allIsolate router management interface from untrusted networks
Configure firewall rules to restrict access to router management IP/ports from trusted IPs only
🧯 If You Can't Patch
- Replace affected routers with models from vendors providing security updates
- Implement strict network access controls to limit exposure of router management interfaces
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System Status or Firmware Upgrade sectionCheck Version:
Login to router admin interface and check firmware version in system informationVerify Fix Applied:
Verify firmware version has been updated to a version not listed in affected versions📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP POST requests to setDeviceName endpoint
- Commands containing shell metacharacters in deviceName or deviceMac parameters
- Multiple failed login attempts followed by setDeviceName requests
Network Indicators:
- HTTP requests to router management interface from unexpected sources
- Traffic patterns indicating command execution (outbound connections from router)
SIEM Query:
source="router_logs" AND (uri_path="/cgi-bin/setDeviceName" OR (param_name="deviceName" OR param_name="deviceMac") AND param_value CONTAINS ["|", ";", "&", "`", "$"])