CVE-2024-57471
📋 TL;DR
H3C N12 V100R005 wireless routers contain a buffer overflow vulnerability in their 2.4G wireless network processing function. Attackers can exploit this by sending specially crafted POST requests to /bin/webs, potentially causing device crashes or remote code execution. This affects all users of H3C N12 routers running V100R005 firmware.
💻 Affected Systems
- H3C N12 wireless router
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote unauthenticated attackers gain full control of the router, enabling network traffic interception, credential theft, and lateral movement into connected networks.
Likely Case
Attackers cause denial of service by crashing the router, disrupting network connectivity for all connected devices.
If Mitigated
With proper network segmentation and access controls, impact is limited to isolated network segments.
🎯 Exploit Status
Proof of concept code is publicly available. Exploitation requires sending a crafted HTTP POST request to the vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: http://h3c.com
Restart Required: Yes
Instructions:
1. Check H3C website for firmware updates. 2. Download latest firmware. 3. Access router admin 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 the vulnerable /bin/webs endpoint by disabling the web management interface.
telnet [router_ip]
system-view
undo ip http enable
undo ip https enable
quit
save
Restrict Web Interface Access
allLimit access to the web management interface to trusted IP addresses only.
telnet [router_ip]
system-view
acl number 2000
rule permit source [trusted_ip] 0
rule deny source any
quit
ip http acl 2000
quit
save
🧯 If You Can't Patch
- Isolate affected routers in dedicated VLANs 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 version. If version is V100R005, device is vulnerable.Check Version:
display versionVerify Fix Applied:
After firmware update, verify version is no longer V100R005. Test by attempting to access /bin/webs endpoint (should not be vulnerable).📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /bin/webs
- Router crash/reboot events
- Unusual traffic patterns from external IPs
Network Indicators:
- HTTP POST requests to /bin/webs with large payloads
- Traffic spikes to router management interface
SIEM Query:
source_ip=* AND destination_port=80 AND http_method=POST AND url_path="/bin/webs"