CVE-2022-30914
📋 TL;DR
This CVE describes a critical stack overflow vulnerability in H3C Magic R100 routers that allows remote attackers to execute arbitrary code by sending specially crafted requests to the /goform/aspForm endpoint. Attackers can exploit this without authentication to potentially take full control of affected devices. All users of H3C Magic R100 routers with firmware version R100V100R005 are affected.
💻 Affected Systems
- H3C Magic R100
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to persistent backdoor installation, credential theft, network traffic interception, and use as pivot point for attacking internal networks.
Likely Case
Remote code execution allowing attacker to modify router configuration, intercept traffic, or use device as part of botnet.
If Mitigated
Limited impact if device is behind firewall with restricted WAN access and proper network segmentation.
🎯 Exploit Status
Public proof-of-concept available in GitHub repository. Exploitation requires sending crafted HTTP POST request to vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not found in provided references
Restart Required: Yes
Instructions:
1. Check H3C official website for firmware updates
2. Download latest firmware if available
3. Access router admin interface
4. Navigate to firmware upgrade section
5. Upload and apply new firmware
6. Reboot router after update
🔧 Temporary Workarounds
Disable WAN Management Access
allPrevent external access to router management interface
Access router admin panel -> Security -> Remote Management -> Disable
Network Segmentation
allIsolate router management interface to separate VLAN
🧯 If You Can't Patch
- Implement strict firewall rules to block all external access to router management interface (TCP ports 80/443)
- Deploy network intrusion detection system (NIDS) to monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check firmware version via admin interface or attempt to access /goform/aspForm endpoint with crafted UpdateMacClone parameterCheck Version:
curl -s http://router-ip/ | grep -i firmware or check admin interface System StatusVerify Fix Applied:
Verify firmware version is updated beyond R100V100R005 and test exploitation no longer works📡 Detection & Monitoring
Log Indicators:
- HTTP POST requests to /goform/aspForm with large UpdateMacClone parameter
- Unusual process execution in router logs
- Configuration changes not initiated by admin
Network Indicators:
- HTTP traffic to router IP on port 80/443 with POST to /goform/aspForm
- Unusual outbound connections from router
SIEM Query:
source="router-logs" AND (uri="/goform/aspForm" OR method="POST" AND uri CONTAINS "aspForm")