CVE-2024-57473
📋 TL;DR
H3C N12 V100R005 routers contain a critical buffer overflow vulnerability in the MAC address editing function due to insufficient input validation. Attackers can exploit this by sending specially crafted POST requests to /bin/webs, potentially causing device crashes or remote code execution. Organizations using affected H3C N12 routers are at risk.
💻 Affected Systems
- H3C N12
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote unauthenticated attackers gain full control of the router, enabling network pivoting, data interception, and persistent backdoor installation.
Likely Case
Attackers crash the router causing denial of service, or execute limited commands to disrupt network operations.
If Mitigated
With proper network segmentation and access controls, impact is limited to the affected router segment.
🎯 Exploit Status
Public proof-of-concept demonstrates exploitation via simple HTTP POST requests. No authentication required.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: http://h3c.com
Restart Required: Yes
Instructions:
1. Check H3C website for security advisory 2. Download latest firmware 3. Backup configuration 4. Upload and install firmware 5. Reboot device 6. Verify installation
🔧 Temporary Workarounds
Disable Web Management Interface
allPrevent access to vulnerable endpoint by disabling web interface
telnet [router_ip]
system-view
undo ip http enable
undo ip https enable
save
Restrict Network Access
allLimit access to router management interface using ACLs
telnet [router_ip]
system-view
acl basic 2000
rule permit source [trusted_network]
rule deny
interface [management_interface]
packet-filter 2000 inbound
save
🧯 If You Can't Patch
- Isolate affected routers in separate VLAN with strict firewall rules
- Implement network monitoring for POST requests to /bin/webs endpoint
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface or CLI: display versionCheck Version:
display version | include VersionVerify Fix Applied:
Verify firmware version is updated beyond V100R005📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /bin/webs
- Device crash/reboot logs
- Unusual command execution logs
Network Indicators:
- HTTP POST requests to /bin/webs with oversized MAC addresses
- Sudden loss of connectivity to router
SIEM Query:
source_ip="*" AND destination_port=80 AND http_method="POST" AND uri="/bin/webs"