CVE-2024-25756
📋 TL;DR
A stack-based buffer overflow vulnerability in Tenda AC9 v.3.0 routers allows remote attackers to execute arbitrary code via the formWifiBasicSet function. This affects users running firmware version v.15.03.06.42_multi, potentially giving attackers full control over the device.
💻 Affected Systems
- Tenda AC9 v.3.0
📦 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 attackers gaining administrative access to the router, enabling network traffic interception, DNS hijacking, or denial of service.
If Mitigated
Limited impact if device is behind firewall with restricted WAN access, though internal threats remain possible.
🎯 Exploit Status
Exploit details and proof-of-concept code are publicly available in GitHub repositories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
Check Tenda's official website for firmware updates. If available, download the latest firmware and apply via the router's web interface under System Tools > Firmware Upgrade.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to the router's web interface by disabling remote management features.
Restrict Network Access
allUse firewall rules to block external access to the router's management interface (typically port 80/443).
🧯 If You Can't Patch
- Replace affected devices with patched or different models
- Segment network to isolate vulnerable routers from critical systems
🔍 How to Verify
Check if Vulnerable:
Access router web interface, navigate to System Tools > System Status, check firmware version matches v.15.03.06.42_multi.Check Version:
Not applicable - check via web interfaceVerify Fix Applied:
Verify firmware version has been updated to a version later than v.15.03.06.42_multi.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/formWifiBasicSet with large payloads
- Multiple failed login attempts followed by exploitation attempts
Network Indicators:
- Unexpected outbound connections from router to unknown IPs
- Traffic patterns suggesting router compromise
SIEM Query:
Not provided