CVE-2024-57703
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on Tenda AC8v4 routers by exploiting a stack overflow in the setSchedWifi function. Attackers can trigger this by sending specially crafted requests to the /goform/openSchedWifi endpoint. All users running the vulnerable firmware version are affected.
💻 Affected Systems
- Tenda AC8v4
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to persistent backdoor installation, network traffic interception, lateral movement to other devices, 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
Denial of service if exploit fails or is detected by network monitoring, with potential for temporary device unavailability.
🎯 Exploit Status
The GitHub reference contains technical details that could be used to develop exploits. Stack overflow vulnerabilities in embedded devices are commonly weaponized.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates. 2. Download latest firmware for AC8v4. 3. Log into router admin interface. 4. Navigate to System Tools > Firmware Upgrade. 5. Upload and install new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable remote administration
allPrevents external attackers from accessing the vulnerable endpoint
Block web interface access
linuxUse firewall rules to restrict access to router admin interface
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
- Implement strict network monitoring for unusual traffic to/from router
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System Status or System ToolsCheck Version:
curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
Verify firmware version is newer than V16.03.34.06 and test if /goform/openSchedWifi endpoint still accepts malformed input📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /goform/openSchedWifi with long schedEndTime parameters
- Router crash/reboot logs
- Unusual process execution in router logs
Network Indicators:
- HTTP POST requests with abnormally long parameters to router IP
- Unusual outbound connections from router
SIEM Query:
source="router.log" AND (url="/goform/openSchedWifi" AND parameter_length>1000)