CVE-2025-9934
📋 TL;DR
This CVE describes a command injection vulnerability in TOTOLINK X5000R routers affecting the sub_410C34 function in the cgi-bin/cstecgi.cgi file. Attackers can manipulate the 'pid' argument to execute arbitrary commands remotely. Users of TOTOLINK X5000R routers with vulnerable firmware are affected.
💻 Affected Systems
- TOTOLINK X5000R
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the router allowing attackers to execute arbitrary commands, pivot to internal networks, install persistent backdoors, or disrupt network services.
Likely Case
Remote code execution leading to router compromise, credential theft, DNS hijacking, or participation in botnets.
If Mitigated
Limited impact if network segmentation isolates the router and external access is restricted.
🎯 Exploit Status
Proof of concept available on GitHub; remote exploitation is possible but may require authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: UNKNOWN
Vendor Advisory: UNKNOWN
Restart Required: No
Instructions:
Check TOTOLINK official website for firmware updates. If available, download and apply the latest firmware through the router's web interface.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to the router's management interface.
Network Segmentation
allIsolate the router from critical internal networks using VLANs or firewalls.
🧯 If You Can't Patch
- Implement strict network access controls to limit exposure to the router's management interface.
- Monitor network traffic for unusual outbound connections or command injection attempts.
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface at System Status > Firmware Version.Check Version:
UNKNOWNVerify Fix Applied:
Verify firmware version has been updated to a version later than 9.1.0cu.2415_B20250515.📡 Detection & Monitoring
Log Indicators:
- Unusual CGI requests to /cgi-bin/cstecgi.cgi with manipulated pid parameter
- Unexpected command execution in system logs
Network Indicators:
- Suspicious HTTP POST requests to router's management interface
- Unusual outbound connections from the router
SIEM Query:
source="router_logs" AND uri="/cgi-bin/cstecgi.cgi" AND (pid CONTAINS "|" OR pid CONTAINS ";" OR pid CONTAINS "`")