CVE-2024-2895
📋 TL;DR
This critical vulnerability in Tenda AC7 routers allows remote attackers to execute arbitrary code via a stack-based buffer overflow in the WPS configuration function. Attackers can exploit this without authentication to potentially take full control of affected devices. All users of Tenda AC7 routers with firmware version 15.03.06.44 are affected.
💻 Affected Systems
- Tenda AC7
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, persistent backdoor installation, network traffic interception, and lateral movement to other devices on the network.
Likely Case
Remote code execution allowing attackers to modify router settings, intercept traffic, or use the device as part of a botnet.
If Mitigated
Limited impact if device is behind strict network segmentation with no internet exposure and all unnecessary services disabled.
🎯 Exploit Status
Public exploit details are available on GitHub. The vulnerability requires no authentication and has straightforward exploitation due to the buffer overflow.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: Yes
Instructions:
No official patch is available. The vendor did not respond to disclosure. Consider replacing affected devices or implementing workarounds.
🔧 Temporary Workarounds
Disable WPS and web management interface
allDisable WiFi Protected Setup (WPS) and the web management interface to remove the attack surface.
Access router admin panel -> Wireless Settings -> Disable WPS
Access router admin panel -> System Tools -> Disable Remote Management
Network segmentation and firewall rules
linuxIsolate the router on a separate VLAN and restrict access to management interfaces.
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
🧯 If You Can't Patch
- Replace affected Tenda AC7 routers with devices from vendors that provide security updates
- Place routers behind a dedicated firewall that blocks all traffic to the management interface from untrusted networks
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface: Login to router admin panel -> System Tools -> Firmware Upgrade to see current version.Check Version:
curl -s http://router-ip/goform/getStatus | grep version or check web interface manuallyVerify Fix Applied:
No official fix exists to verify. Verify workarounds by confirming WPS is disabled and management interface is not accessible from untrusted networks.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/WifiWpsOOB
- Multiple failed buffer overflow attempts in system logs
- Unexpected process crashes or restarts
Network Indicators:
- Unusual traffic patterns to router management interface
- Suspicious POST requests with long parameter values for 'index' parameter
SIEM Query:
source="router_logs" AND (url="/goform/WifiWpsOOB" OR message="buffer overflow" OR message="segmentation fault")🔗 References
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/AC7/v1/formWifiWpsOOB.md
- https://vuldb.com/?ctiid.257938
- https://vuldb.com/?id.257938
- https://vuldb.com/?submit.300358
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/AC7/v1/formWifiWpsOOB.md
- https://vuldb.com/?ctiid.257938
- https://vuldb.com/?id.257938
- https://vuldb.com/?submit.300358
