CVE-2023-29693
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on H3C GR-1200W MiniGRW1A0V100R006 routers via a stack overflow in the set_tftp_upgrad function. Attackers can potentially gain full control of affected devices. Organizations using these specific H3C router models are affected.
💻 Affected Systems
- H3C GR-1200W MiniGRW1A0V100R006
📦 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 potential data exfiltration.
Likely Case
Remote code execution allowing attackers to modify router configuration, intercept traffic, or use device as pivot point for further attacks.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering and network segmentation prevents lateral movement.
🎯 Exploit Status
Public GitHub repository contains technical details and likely exploit code. CVSS 9.8 score indicates trivial exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not found in provided references
Restart Required: Yes
Instructions:
1. Check H3C official website for security advisories
2. Download latest firmware if available
3. Backup current configuration
4. Upload and apply new firmware
5. Verify functionality after reboot
🔧 Temporary Workarounds
Disable TFTP upgrade functionality
allPrevent exploitation by disabling the vulnerable TFTP upgrade feature if not required
Configuration commands specific to H3C routers to disable TFTP services
Network access restrictions
linuxRestrict access to router management interfaces
iptables -A INPUT -p tcp --dport [router_ports] -s [trusted_ips] -j ACCEPT
iptables -A INPUT -p tcp --dport [router_ports] -j DROP
🧯 If You Can't Patch
- Isolate affected routers in separate VLAN with strict firewall rules
- Implement network monitoring for unusual traffic patterns from router devices
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface or CLI: show versionCheck Version:
show version (H3C CLI)Verify Fix Applied:
Verify firmware has been updated to version beyond V100R006📡 Detection & Monitoring
Log Indicators:
- Unusual TFTP connection attempts
- Unexpected configuration changes
- Failed upgrade attempts
Network Indicators:
- TFTP traffic to router management interface from untrusted sources
- Unusual outbound connections from router
SIEM Query:
source_ip=[router_ip] AND (protocol=TFTP OR port=69) AND dest_ip=[external_ip]