CVE-2022-30909
📋 TL;DR
This CVE describes a stack overflow vulnerability in H3C Magic R100 routers via the CMD parameter at /goform/aspForm. Attackers can exploit this to execute arbitrary code remotely, potentially taking full control of affected devices. All users of H3C Magic R100 routers running vulnerable firmware are affected.
💻 Affected Systems
- H3C Magic R100
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, credential theft, lateral movement into internal networks, and persistent backdoor installation.
Likely Case
Remote code execution allowing attackers to reconfigure the router, intercept network traffic, or use the device as a foothold for further attacks.
If Mitigated
Limited impact if proper network segmentation and access controls prevent external exploitation attempts.
🎯 Exploit Status
Public proof-of-concept code exists in GitHub repositories. Exploitation requires sending a specially crafted HTTP request to the vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not publicly available
Restart Required: Yes
Instructions:
1. Check H3C official website for firmware updates
2. Download latest firmware for Magic R100
3. Access router web interface
4. Navigate to firmware upgrade section
5. Upload and apply new firmware
6. Reboot router after update
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router web interface
Access router admin interface -> Advanced Settings -> Remote Management -> Disable
Network Segmentation
allIsolate router management interface from untrusted networks
Configure firewall rules to restrict access to router IP on port 80/443
🧯 If You Can't Patch
- Implement strict network access controls to limit access to router management interface
- Monitor network traffic for exploitation attempts and implement intrusion detection
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface or SSH. If version is R100V100R005, device is vulnerable.Check Version:
curl -s http://router-ip/ | grep -i firmware || ssh admin@router-ip 'cat /etc/version'Verify Fix Applied:
Verify firmware version has been updated to a version later than R100V100R005📡 Detection & Monitoring
Log Indicators:
- HTTP requests to /goform/aspForm with unusual CMD parameter values
- Large payloads in POST requests to router management interface
Network Indicators:
- Unusual HTTP traffic patterns to router management interface
- POST requests with buffer overflow patterns
SIEM Query:
source="router-logs" AND (url="/goform/aspForm" AND (cmd="*" OR content_length>1000))