CVE-2024-0534
📋 TL;DR
A critical stack-based buffer overflow vulnerability in Tenda A15 routers allows remote attackers to execute arbitrary code by manipulating the 'mac' parameter in the web management interface. This affects Tenda A15 routers running firmware version 15.13.07.13. Attackers can exploit this without authentication to potentially take full control of affected devices.
💻 Affected Systems
- Tenda A15
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, lateral movement to internal networks, persistent backdoor installation, and botnet recruitment.
Likely Case
Remote code execution allowing attackers to modify router settings, intercept traffic, or use the device as a pivot point for further attacks.
If Mitigated
Limited impact if device is behind firewall with restricted web interface access, though vulnerability remains present.
🎯 Exploit Status
Public exploit code is available on GitHub. The vulnerability is straightforward to exploit with publicly available tools.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch available. Vendor was contacted but did not respond. Consider replacing affected devices or implementing workarounds.
🔧 Temporary Workarounds
Disable Web Management Interface
allDisable the web-based management interface to prevent remote exploitation.
Router-specific - typically through CLI or alternative management interface
Restrict Access with Firewall Rules
linuxBlock external access to port 80 (HTTP) and port 443 (HTTPS if enabled) on the router.
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
🧯 If You Can't Patch
- Isolate affected routers in separate network segments with strict firewall rules
- Monitor network traffic for unusual patterns or exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface at http://router-ip/ or using CLI command 'show version' if available.Check Version:
Router-specific - typically via web interface or 'cat /proc/version' if SSH access is availableVerify Fix Applied:
No official fix available to verify. Workarounds can be verified by testing if web interface is inaccessible or properly firewalled.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/SetOnlineDevName with long mac parameters
- Multiple failed buffer overflow attempts in system logs
Network Indicators:
- Unusual traffic patterns to router web interface from external IPs
- Exploit-specific payloads in HTTP requests
SIEM Query:
http.url:"/goform/SetOnlineDevName" AND http.method:POST AND http.request_body_length>100