CVE-2022-26208
📋 TL;DR
This CVE describes a command injection vulnerability in multiple Totolink router models that allows attackers to execute arbitrary commands via the webWlanIdx parameter in the setWebWlanIdx function. Attackers can achieve remote code execution with high privileges. Organizations and individuals using affected Totolink router models are vulnerable.
💻 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 device compromise leading to persistent backdoor installation, network traffic interception, lateral movement to connected devices, and participation in botnets.
Likely Case
Remote code execution allowing attackers to modify router configuration, intercept traffic, or use the device as a pivot point for further attacks.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering and network segmentation.
🎯 Exploit Status
Public proof-of-concept code exists in GitHub repositories. Exploitation requires sending a crafted HTTP request to the vulnerable endpoint.
🛠️ 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. 2. Download appropriate firmware for your model. 3. Access router admin interface. 4. Navigate to firmware upgrade section. 5. Upload and apply new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable remote management
allDisable web management interface access from WAN/Internet
Network segmentation
allPlace routers in isolated network segments with strict firewall rules
🧯 If You Can't Patch
- Implement strict network access controls to limit exposure to vulnerable routers
- Monitor network traffic for unusual patterns and command injection attempts
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface against affected versions listCheck Version:
Login to router admin interface and check System Status or Firmware Information pageVerify Fix Applied:
Verify firmware version has been updated to a version not listed in affected versions📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP requests to router management interface
- Commands containing shell metacharacters in webWlanIdx parameter
Network Indicators:
- HTTP POST requests to router management interface with suspicious parameters
- Outbound connections from router to unexpected destinations
SIEM Query:
source="router_logs" AND (uri="*setWebWlanIdx*" AND param="*webWlanIdx*" AND value="*;*" OR value="*|*" OR value="*`*" OR value="*$(*")