CVE-2001-1495

Step 1: Payload Delivery: The attacker crafts a malicious URL containing a specially crafted target parameter. This parameter includes shell metacharacters and the desired commands to be executed on the server. For example: http://vulnerable_server/network_query.php?target=;id; Step 2: Request Processing: The vulnerable network_query.php script receives the HTTP request containing the malicious target parameter. Step 3: Command Execution: The script, without proper sanitization, passes the attacker-controlled target parameter to a shell command execution function (e.g., exec()). Step 4: Shell Interpretation: The shell interprets the injected metacharacters and executes the attacker's commands alongside the intended command. In the example, the id command would be executed, revealing the user the webserver is running as. Step 5: Result Retrieval: The output of the executed commands (e.g., id output) is returned to the attacker, confirming successful exploitation and providing information about the system.

The vulnerability lies within network_query.php in Network Query Tool 1.0. The script fails to properly sanitize the target parameter before passing it to a shell command. This allows attackers to inject shell metacharacters (e.g., ;, &, |, &&, ||) into the target parameter. When the script executes the command, these metacharacters are interpreted by the shell, leading to arbitrary command execution. The root cause is a lack of input validation and output encoding on the target parameter, directly leading to a command injection vulnerability. The script likely uses a function like exec(), system(), or shell_exec() to execute the command, making the vulnerability exploitable.