CVE-2022-26214
📋 TL;DR
This CVE describes a command injection vulnerability in multiple Totolink router models that allows attackers to execute arbitrary commands via the host_time parameter in the NTPSyncWithHost function. Attackers can achieve remote code execution with high privileges, potentially taking full control of affected devices. Organizations and individuals using the specified Totolink router models are affected.
💻 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 botnet recruitment for DDoS attacks.
If Mitigated
Limited impact if routers are behind firewalls with strict inbound filtering and network segmentation.
🎯 Exploit Status
Public proof-of-concept available on GitHub. Exploitation requires sending crafted HTTP requests to vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
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 new firmware file. 6. Wait for reboot and verify version.
🔧 Temporary Workarounds
Disable remote administration
allPrevent external access to router administration interface
Access router admin panel -> System -> Remote Management -> Disable
Network segmentation
allIsolate routers in separate VLAN with strict firewall rules
🧯 If You Can't Patch
- Replace vulnerable routers with supported models from different vendors
- Implement strict network ACLs to block all inbound traffic to router management interfaces
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface against affected versions list. Test with controlled exploit if authorized.Check Version:
curl -s http://router-ip/cgi-bin/cstecgi.cgi -X POST -d '{"topicurl":"setting/getMainDiagStatus"}' | grep -i versionVerify Fix Applied:
Verify firmware version has changed from vulnerable versions. Test NTPSyncWithHost function with safe payloads.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /cgi-bin/cstecgi.cgi with host_time parameter containing shell metacharacters
- Unexpected command execution in system logs
Network Indicators:
- HTTP POST requests to router IP on port 80/443 with unusual payloads in host_time parameter
- Outbound connections from router to suspicious IPs
SIEM Query:
source="router_logs" AND (uri_path="/cgi-bin/cstecgi.cgi" AND method="POST" AND (host_time CONTAINS "|" OR host_time CONTAINS ";" OR host_time CONTAINS "`"))