CVE-2022-28935
📋 TL;DR
This CVE describes a command injection vulnerability in multiple Totolink router models that allows attackers to execute arbitrary commands on affected devices. The vulnerability affects specific firmware versions of Totolink A830R, A3100R, A950RG, A800R, A3000RU, and A810R routers. Attackers can exploit this to gain unauthorized access and control over the router.
💻 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 router with persistent backdoor installation, credential theft, network traffic interception, and lateral movement to connected devices.
Likely Case
Router takeover leading to DNS hijacking, credential harvesting, and network disruption.
If Mitigated
Limited impact if routers are behind firewalls with restricted WAN access and proper network segmentation.
🎯 Exploit Status
Command injection vulnerabilities are typically easy to exploit with publicly available tools. The provided Google Drive links likely contain exploit details.
🛠️ 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
allPrevent external access to router administration interface
Network Segmentation
allIsolate routers in separate network segment with strict firewall rules
🧯 If You Can't Patch
- Replace affected routers with patched or different vendor models
- Implement strict network access controls and monitor for suspicious activity
🔍 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 in the affected list📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in system logs
- Multiple failed login attempts followed by successful access
- Unexpected configuration changes
Network Indicators:
- Unusual outbound connections from router
- DNS queries to suspicious domains
- Port scanning originating from router
SIEM Query:
source="router_logs" AND (command="*;*" OR command="*|*" OR command="*`*" OR command="*$(*)")🔗 References
- https://drive.google.com/drive/folders/1JNX74lNgC3U9pnrcNlGo0hsDGZzF6h7F
- https://drive.google.com/drive/folders/1JNX74lNgC3U9pnrcNlGo0hsDGZzF6h7F?usp=sharing
- https://drive.google.com/drive/folders/1JNX74lNgC3U9pnrcNlGo0hsDGZzF6h7F
- https://drive.google.com/drive/folders/1JNX74lNgC3U9pnrcNlGo0hsDGZzF6h7F?usp=sharing
