CVE-2022-30912
📋 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 potentially take full control of affected routers. 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 compromise of router with persistent backdoor installation, credential theft, network traffic interception, and lateral movement to internal networks.
Likely Case
Router takeover leading to DNS hijacking, credential harvesting, and use as pivot point for internal attacks.
If Mitigated
Limited impact if routers are behind firewalls with strict inbound filtering and 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 available
Restart Required: Yes
Instructions:
1. Check H3C official website for firmware updates
2. Download latest firmware if available
3. Upload firmware via router web interface
4. Reboot router after update
🔧 Temporary Workarounds
Disable remote management
allDisable web management interface from WAN/Internet access
Network segmentation
allPlace routers in isolated network segment with strict firewall rules
🧯 If You Can't Patch
- Replace vulnerable routers with supported models
- Implement strict network ACLs to block access to router management interfaces
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface at System Status > Firmware VersionCheck Version:
Not applicable - check via web interfaceVerify Fix Applied:
Verify firmware version is no longer R100V100R005📡 Detection & Monitoring
Log Indicators:
- HTTP POST requests to /goform/aspForm with UpdateWanParams parameter
- Unusual process execution or memory errors in router logs
Network Indicators:
- HTTP traffic to router IP on port 80/443 with suspicious POST payloads
- Unusual outbound connections from router
SIEM Query:
http.method:POST AND http.uri:"/goform/aspForm" AND http.param:"UpdateWanParams"