CVE-2022-34607
📋 TL;DR
CVE-2022-34607 is a critical stack overflow vulnerability in H3C Magic R200 routers that allows remote attackers to execute arbitrary code by sending specially crafted requests to the /doping.asp endpoint. This affects H3C Magic R200 routers running vulnerable firmware versions, potentially giving attackers full control of affected devices.
💻 Affected Systems
- H3C Magic R200
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to persistent backdoor installation, credential theft, network pivoting to internal systems, and participation in botnets.
Likely Case
Remote code execution allowing attackers to reconfigure the router, intercept network traffic, or use the device as a foothold 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 proof-of-concept code exists in GitHub repositories, making exploitation trivial for attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: R200V200R004L02 or later patched version
Vendor Advisory: https://www.h3c.com/en/Support/Resource_Center/Security_Advisories/
Restart Required: Yes
Instructions:
1. Log into H3C support portal. 2. Download latest firmware for R200. 3. Access router admin interface. 4. Navigate to firmware upgrade section. 5. Upload and apply new firmware. 6. Reboot router after upgrade completes.
🔧 Temporary Workarounds
Block access to vulnerable endpoint
linuxUse firewall rules to block external access to /doping.asp endpoint
iptables -A INPUT -p tcp --dport 80 -m string --string "/doping.asp" --algo bm -j DROP
iptables -A INPUT -p tcp --dport 443 -m string --string "/doping.asp" --algo bm -j DROP
Disable web management interface
allTurn off web-based administration if not required
ssh admin@router-ip "configure terminal"
no ip http server
no ip http secure-server
write memory
🧯 If You Can't Patch
- Isolate affected routers in separate VLAN with strict firewall rules limiting inbound/outbound traffic
- Implement network monitoring for unusual traffic patterns or exploit attempts targeting /doping.asp
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface (System Status > Firmware Version) or SSH command: show versionCheck Version:
show version (via SSH) or check web admin interfaceVerify Fix Applied:
Verify firmware version is R200V200R004L02 or later, then test with curl: curl -v http://router-ip/doping.asp -d "HOST=$(python -c 'print "A"*1000')" should not crash📡 Detection & Monitoring
Log Indicators:
- Large HOST parameter values in web logs
- Repeated requests to /doping.asp
- Router crash/restart events
Network Indicators:
- HTTP POST requests to /doping.asp with oversized HOST parameter
- Unusual outbound connections from router after exploit
SIEM Query:
source="router-logs" AND uri="/doping.asp" AND (HOST="*" AND length(HOST)>500)