CVE-2022-30924
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on H3C Magic R100 routers via a stack overflow in the SetAPWifiorLedInfoById parameter. Attackers can exploit this without authentication by sending specially crafted requests to the vulnerable endpoint. All users of affected H3C Magic R100 routers are at risk.
💻 Affected Systems
- H3C Magic R100
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attackers to install persistent malware, intercept all network traffic, pivot to internal networks, and use the device as part of a botnet.
Likely Case
Remote code execution leading to device takeover, credential theft, and network surveillance capabilities.
If Mitigated
Limited impact if device is behind strict network segmentation with no internet exposure and all management interfaces are disabled.
🎯 Exploit Status
Public proof-of-concept code exists in GitHub repositories, making exploitation straightforward for attackers with basic skills.
🛠️ 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 Web Management Interface
allDisable the vulnerable web interface to prevent exploitation
Access router CLI via SSH/Telnet
Enter configuration mode
Disable web management service
Network Segmentation
allIsolate router management interface from untrusted networks
Configure firewall rules to block external access to port 80/443
Restrict management access to specific IP addresses only
🧯 If You Can't Patch
- Replace affected devices with updated models or different vendors
- Implement strict network access controls and monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface at System Status > Firmware VersionCheck Version:
curl -s http://router-ip/status.cgi | grep FirmwareVerify Fix Applied:
Verify firmware version is newer than R100V100R005 and test if /goform/aspForm endpoint still accepts SetAPWifiorLedInfoById parameter📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/aspForm
- Large payloads sent to SetAPWifiorLedInfoById parameter
- Multiple failed authentication attempts followed by successful exploitation
Network Indicators:
- HTTP POST requests to /goform/aspForm with abnormal payload sizes
- Traffic patterns indicating reverse shell connections from router
SIEM Query:
source="router-logs" AND (uri="/goform/aspForm" OR parameter="SetAPWifiorLedInfoById") AND bytes_sent>1000