How the CVE Works
The CVE-2025-29218 vulnerability in Tenda W18E v2.0 (firmware v16.01.0.11) stems from a stack-based buffer overflow in the `wifiPwd` parameter within the `/goform/setModules` endpoint. When an attacker sends an excessively long string via a crafted POST request, the device fails to properly validate input length, leading to a stack overflow. This corrupts memory and crashes the system, resulting in a Denial of Service (DoS). The flaw occurs due to insecure handling of user-supplied data in the firmware’s web management interface.
DailyCVE Form:
Platform: Tenda W18E
Version: v16.01.0.11
Vulnerability: Stack Overflow
Severity: Critical
Date: 03/26/2025
What Undercode Say:
Exploitation:
1. Craft malicious POST request:
curl -X POST -d "wifiPwd=$(python -c 'print("A"2000)')" http://<target_ip>/goform/setModules
2. Trigger DoS: Overflow overwrites return addresses, crashing the device.
Protection:
1. Firmware Update: Apply vendor patches.
2. Input Validation: Restrict `wifiPwd` length server-side.
3. Network Segmentation: Isolate IoT devices.
Detection:
nmap --script http-vuln-cve2025-29218 -p80 <target_ip>
Mitigation Code (WAF Rule):
location /goform/setModules {
if ($arg_wifiPwd ~ .{100,}) {
return 403;
}
}
Debugging (Crash Analysis):
gdb -q /usr/bin/tenda_firmware (gdb) run -c "wifiPwd=AAAAAAAA..." (gdb) info registers
References:
- bash
- Vendor advisory: Tenda Security Bulletin TS-2025-003
Analytics:
- CVSS 4.0: 9.8 (Critical)
- Attack Vector: Network
- Exploitability: Low complexity, no auth required.
References:
Reported By: https://nvd.nist.gov/vuln/detail/CVE-2025-29218
Extra Source Hub:
Undercode
