CVE-2023-33381
📋 TL;DR
This CVE describes a command injection vulnerability in the MitraStar GPT-2741GNAC router's ping functionality. Authenticated users can execute arbitrary operating system commands by sending specially crafted input, potentially gaining full control of the router. This affects users of the MitraStar GPT-2741GNAC router with vulnerable firmware.
💻 Affected Systems
- MitraStar GPT-2741GNAC router
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete router compromise allowing attacker to intercept all network traffic, install persistent backdoors, pivot to internal networks, and use router as attack platform.
Likely Case
Router takeover leading to network traffic interception, credential theft, and potential lateral movement to connected devices.
If Mitigated
Limited impact if strong authentication controls and network segmentation prevent unauthorized access to router management interface.
🎯 Exploit Status
Exploit requires authenticated access but is simple to execute once credentials are obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No official vendor advisory found
Restart Required: Yes
Instructions:
1. Check vendor website for firmware updates
2. Download latest firmware
3. Backup router configuration
4. Upload firmware via web interface
5. Reboot router
6. Restore configuration if needed
🔧 Temporary Workarounds
Disable ping functionality
allRemove or restrict access to ping diagnostic tool in router interface
Network segmentation
allIsolate router management interface from general network access
🧯 If You Can't Patch
- Change default credentials and implement strong authentication
- Restrict management interface access to specific IP addresses only
🔍 How to Verify
Check if Vulnerable:
Check router firmware version matches AR_g5.8_110WVN0b7_2 via web interface or SSHCheck Version:
Check router web interface under System Information or use telnet/SSH if availableVerify Fix Applied:
Verify firmware version has been updated to newer version than AR_g5.8_110WVN0b7_2📡 Detection & Monitoring
Log Indicators:
- Unusual ping commands in router logs
- Multiple failed authentication attempts followed by ping activity
- Unexpected system command execution
Network Indicators:
- Unusual outbound connections from router
- Traffic patterns suggesting router compromise
SIEM Query:
source="router" AND (command="ping" AND (payload="|" OR payload=";" OR payload="`"))