CVE-2022-30916
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on H3C Magic R100 routers by sending specially crafted requests to the /goform/aspForm endpoint. Attackers can exploit a stack overflow in the Asp_SetTelnetDebug parameter to gain full control of affected devices. This affects all users running vulnerable versions of H3C Magic R100 routers.
💻 Affected Systems
- H3C Magic R100
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to persistent backdoor installation, network traffic interception, lateral movement to other devices, and botnet recruitment.
Likely Case
Remote code execution allowing attackers to modify router settings, intercept traffic, or use the device as a pivot point for further attacks.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering and network segmentation prevents lateral movement.
🎯 Exploit Status
Public proof-of-concept code exists in GitHub repositories. The vulnerability requires no authentication and has a simple exploitation path.
🛠️ 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 for Magic R100. 3. Access router admin interface. 4. Navigate to firmware upgrade section. 5. Upload and apply new firmware. 6. Reboot router after update completes.
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to router management interface
Network segmentation
allIsolate router management interface to trusted network segments only
🧯 If You Can't Patch
- Implement strict firewall rules to block all inbound traffic to router management interface (typically port 80/443)
- Deploy network intrusion detection systems to monitor for exploitation attempts targeting /goform/aspForm endpoint
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via admin interface. If version is R100V100R005, device is vulnerable.Check Version:
Check via web interface: Login to router admin panel and navigate to System Status or Firmware Information page.Verify Fix Applied:
Verify firmware version has been updated to a version later than R100V100R005 via admin interface.📡 Detection & Monitoring
Log Indicators:
- HTTP POST requests to /goform/aspForm with Asp_SetTelnetDebug parameter containing unusually long or malformed data
Network Indicators:
- Unusual outbound connections from router, unexpected traffic patterns, or router responding to port scans it shouldn't
SIEM Query:
source_ip="router_ip" AND http_request="POST /goform/aspForm" AND http_uri_parameter="Asp_SetTelnetDebug"