CVE-2023-33629
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on H3C Magic R300 routers via a stack overflow in the DeltriggerList interface. Attackers can exploit this by sending specially crafted requests to the /goform/aspForm endpoint. Only H3C Magic R300 routers running specific vulnerable firmware versions are affected.
💻 Affected Systems
- H3C Magic R300
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to persistent backdoor installation, credential theft, network traffic interception, and lateral movement to other devices on the network.
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 the device is behind a firewall with strict inbound filtering and network segmentation prevents lateral movement.
🎯 Exploit Status
Public proof-of-concept exists in the referenced research. Exploitation requires sending a crafted HTTP request to the vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: No
Instructions:
Check H3C official website for firmware updates. If available, download and install the latest firmware through the router's web interface.
🔧 Temporary Workarounds
Block Access to Vulnerable Interface
linuxUse firewall rules to block external access to the router's web interface and management ports
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
Disable Remote Management
allTurn off remote management features in the router's administration interface
🧯 If You Can't Patch
- Segment the router on an isolated network segment with strict firewall rules
- Implement network monitoring for unusual traffic patterns to/from the router
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in web interface at System Status > Firmware VersionCheck Version:
curl -s http://router-ip/goform/getStatus | grep firmwareVerify Fix Applied:
Verify firmware version has been updated to a version newer than R300-2100MV100R004📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/aspForm with large payloads
- Multiple failed authentication attempts followed by successful exploit
Network Indicators:
- Unusual outbound connections from router to external IPs
- Spike in traffic to router's management interface
SIEM Query:
source="router_logs" AND (uri="/goform/aspForm" OR method="POST" AND uri="/goform/aspForm")