CVE-2024-0531
📋 TL;DR
This critical vulnerability in Tenda A15 routers allows remote attackers to execute arbitrary code via a stack-based buffer overflow in the web management interface. Attackers can exploit this by sending specially crafted requests to the /goform/setBlackRule endpoint, potentially gaining full control of affected devices. All users of Tenda A15 routers with firmware version 15.13.07.13 are affected.
💻 Affected Systems
- Tenda A15
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, allowing attackers to install malware, pivot to internal networks, or create persistent backdoors.
Likely Case
Remote code execution resulting in device takeover, enabling attackers to modify router settings, intercept network traffic, or launch attacks against internal systems.
If Mitigated
Limited impact if the web management interface is not exposed to the internet and proper network segmentation is in place.
🎯 Exploit Status
Exploit details are publicly available on GitHub, making weaponization likely. The vulnerability requires no authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: Yes
Instructions:
No official patch available. Contact Tenda support for firmware updates. If unavailable, consider replacing affected devices.
🔧 Temporary Workarounds
Disable Web Management Interface
allDisable the web-based management interface to prevent exploitation.
Router-specific commands vary. Typically accessed via CLI or alternative management interface.
Restrict Access to Management Interface
linuxUse firewall rules to restrict access to the web management interface to trusted IP addresses only.
iptables -A INPUT -p tcp --dport 80 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
🧯 If You Can't Patch
- Replace affected Tenda A15 routers with devices from vendors that provide security updates.
- Segment affected routers into isolated network zones to limit potential lateral movement.
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface at http://router-ip or using CLI commands specific to Tenda devices.Check Version:
Varies by router model. Typically accessible via web interface or telnet/SSH to router.Verify Fix Applied:
Verify firmware version has been updated to a version later than 15.13.07.13, though no patched version is currently known.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/setBlackRule with long deviceList parameters
- Multiple failed exploitation attempts
Network Indicators:
- HTTP requests to /goform/setBlackRule with unusually long parameters
- Traffic from unexpected sources to router management port
SIEM Query:
http.url:"/goform/setBlackRule" AND http.method:POST AND http.request_body_length:>1000