CVE-2024-42745
📋 TL;DR
This CVE describes an authenticated OS command injection vulnerability in TOTOLINK X5000r routers. Attackers with valid credentials can send specially crafted packets to execute arbitrary commands on the device. This affects users of the vulnerable router firmware version.
💻 Affected Systems
- TOTOLINK X5000r
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full router compromise allowing attacker to install persistent backdoors, intercept all network traffic, pivot to internal networks, and brick the device.
Likely Case
Router takeover leading to network surveillance, credential theft, DNS hijacking, and use as botnet node.
If Mitigated
Limited impact if strong authentication controls prevent unauthorized access and network segmentation isolates the router.
🎯 Exploit Status
Exploit details and proof-of-concept are publicly available in GitHub repository. Attack requires valid credentials.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: Yes
Instructions:
1. Check TOTOLINK website for firmware updates
2. Download latest firmware for X5000r
3. Log into router admin interface
4. Navigate to System Tools > Firmware Upgrade
5. Upload and apply new firmware
6. Reboot router after update completes
🔧 Temporary Workarounds
Disable UPnP Service
allDisable Universal Plug and Play service to remove vulnerable endpoint
Login to router admin panel
Navigate to Advanced > UPnP
Set UPnP to Disabled
Save and apply changes
Restrict Admin Access
allLimit router admin interface access to specific IP addresses
Login to router admin panel
Navigate to Security > Access Control
Add firewall rules to restrict admin port (typically 80/443) to trusted IPs only
Save and apply changes
🧯 If You Can't Patch
- Isolate router on separate VLAN with strict firewall rules
- Change default admin credentials and implement strong password policy
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System Status or System Tools > Firmware UpgradeCheck Version:
Login to router web interface and navigate to System Status pageVerify Fix Applied:
Verify firmware version is newer than v9.1.0cu.2350_b20230313 and test UPnP configuration endpoint with safe payloads📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /cgi-bin/cstecgi.cgi with UPnP parameters
- Multiple failed login attempts followed by successful login and command execution patterns
- System logs showing unexpected command execution
Network Indicators:
- Unusual outbound connections from router to external IPs
- DNS queries to suspicious domains from router
- Traffic patterns indicating router compromise
SIEM Query:
source="router_logs" AND (uri="/cgi-bin/cstecgi.cgi" AND params CONTAINS "UPnP") AND (params CONTAINS "$" OR params CONTAINS "|" OR params CONTAINS ";")