CVE-2024-2893
📋 TL;DR
This critical vulnerability in Tenda AC7 routers allows remote attackers to execute arbitrary code via a stack-based buffer overflow in the device name setting function. Attackers can exploit this without authentication to potentially take full control of affected routers. All users running Tenda AC7 firmware version 15.03.06.44 are affected.
💻 Affected Systems
- Tenda AC7
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of router with persistent backdoor installation, credential theft, network traffic interception, and pivot to internal network devices.
Likely Case
Router takeover leading to DNS hijacking, credential harvesting, and botnet recruitment for DDoS attacks.
If Mitigated
Limited impact if router is behind firewall with restricted WAN access, though internal attacks remain possible.
🎯 Exploit Status
Public exploit code available on GitHub, remote exploitation without authentication, simple buffer overflow technique.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: Yes
Instructions:
No official patch available. Consider replacing affected hardware or implementing strict network controls.
🔧 Temporary Workarounds
Disable Remote Management
allDisable web management interface from WAN/Internet access
Access router admin panel > System Tools > Remote Management > Disable
Network Segmentation
allIsolate router management interface to separate VLAN
🧯 If You Can't Patch
- Replace affected Tenda AC7 routers with different models from vendors with better security track records
- Implement strict firewall rules blocking all inbound traffic to router management interfaces (ports 80, 443, 8080)
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin panel: System Tools > Firmware Upgrade > Current VersionCheck Version:
curl -s http://router-ip/ | grep -i 'firmware version' or check web interfaceVerify Fix Applied:
Verify firmware version is different from 15.03.06.44📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/SetOnlineDevName with long devName parameters
- Router crash/reboot logs
Network Indicators:
- HTTP POST requests to router IP on port 80/443 with oversized devName parameter
- Unusual outbound connections from router
SIEM Query:
source="router_logs" AND (uri="/goform/SetOnlineDevName" AND content_length>100) OR (process="httpd" AND event="crash")🔗 References
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/AC7/v1/formSetDeviceName_devName.md
- https://vuldb.com/?ctiid.257936
- https://vuldb.com/?id.257936
- https://vuldb.com/?submit.300356
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/AC7/v1/formSetDeviceName_devName.md
- https://vuldb.com/?ctiid.257936
- https://vuldb.com/?id.257936
- https://vuldb.com/?submit.300356
