CVE-2023-34928
📋 TL;DR
A stack overflow vulnerability in the Edit_BasicSSID function of H3C Magic B1STV100R012 routers allows attackers to cause a Denial of Service (DoS) via crafted POST requests. This affects H3C Magic B1ST routers running vulnerable firmware versions. Attackers can crash the device, disrupting network services.
💻 Affected Systems
- H3C Magic B1ST
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device crash requiring physical reboot, extended service disruption, potential for remote code execution if stack overflow can be controlled
Likely Case
Temporary DoS causing network outage until device reboots automatically or manually
If Mitigated
Minimal impact with proper network segmentation and monitoring
🎯 Exploit Status
Exploit requires sending crafted POST request to vulnerable endpoint
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check H3C website for firmware updates
2. Download latest firmware
3. Access router web interface
4. Navigate to firmware upgrade section
5. Upload and apply new firmware
6. Reboot router
🔧 Temporary Workarounds
Disable web management interface
allPrevent access to vulnerable web interface
Access router CLI via SSH/Telnet
Disable HTTP/HTTPS management services
Network segmentation
allIsolate router management interface from untrusted networks
Configure firewall rules to restrict access to router management IP
🧯 If You Can't Patch
- Implement strict network access controls to router management interface
- Monitor for abnormal POST requests to router web interface
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface or CLI, test with crafted POST request to Edit_BasicSSID endpointCheck Version:
ssh admin@router_ip show versionVerify Fix Applied:
Verify firmware version is updated beyond V100R012, test exploit no longer causes crash📡 Detection & Monitoring
Log Indicators:
- Multiple failed POST requests
- Router crash/reboot logs
- Abnormal traffic to management interface
Network Indicators:
- Unusual POST requests to router management IP
- Traffic patterns indicating DoS attempts
SIEM Query:
source_ip="router_ip" AND http_method="POST" AND uri="*Edit_BasicSSID*"