CVE-2022-30926
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on H3C Magic R100 routers via a stack overflow in the EditMacList parameter. Attackers can exploit this without authentication to gain full control of affected devices. All users running vulnerable firmware versions 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, network traffic interception, lateral movement to internal networks, and botnet recruitment.
Likely Case
Remote code execution allowing attackers to modify router settings, intercept traffic, or use the device as a pivot point into internal networks.
If Mitigated
Limited impact if device is behind firewall with strict inbound filtering and network segmentation prevents lateral movement.
🎯 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: No
Instructions:
Check H3C official website for firmware updates. If available, download latest firmware and apply through web interface.
🔧 Temporary Workarounds
Disable Remote Management
allDisable web management interface from WAN/external interfaces
Network Segmentation
allPlace affected routers in isolated network segment with strict firewall rules
🧯 If You Can't Patch
- Implement strict network access controls to limit access to router management interface
- Monitor network traffic for exploitation attempts and unusual outbound connections
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface or SSH. If version is R100V100R005, device is vulnerable.Check Version:
Check web interface System Status page or use vendor-specific CLI commandsVerify Fix Applied:
Verify firmware version has been updated to a version later than R100V100R005📡 Detection & Monitoring
Log Indicators:
- HTTP POST requests to /goform/aspForm with malformed EditMacList parameter
- Unusual process execution or configuration changes
Network Indicators:
- HTTP traffic to router management interface with suspicious payloads
- Unusual outbound connections from router
SIEM Query:
source_ip=router_ip AND http_method=POST AND uri_path="/goform/aspForm" AND http_user_agent CONTAINS suspicious