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WordPress Advanced Custom Fields 4.4.7 Cross Site Scripting

WordPress Advanced Custom Fields 4.4.7 Cross Site Scripting
Posted May 2, 2016
Authored by Rahul Pratap Singh

WordPress Advanced Custom Fields plugin version 4.4.7 suffers from a cross site scripting vulnerability.

tags | exploit, xss
MD5 | 1d06c368059fb88e0eb7e756377c885b

WordPress Advanced Custom Fields 4.4.7 Cross Site Scripting

Change Mirror Download
## FULL DISCLOSURE

#Product : Advanced Custom Fields
#Exploit Author : Rahul Pratap Singh
#Version : 4.4.7
#Home page Link :https://wordpress.org/plugins/advanced-custom-fields/
#Website : https://0x62626262.wordpress.com
#Linkedin : https://in.linkedin.com/in/rahulpratapsingh94
#Date : 1/5/2016

Authenticated XSS Vulnerability:

----------------------------------------
Description:
----------------------------------------
"type, label, name and field" parameters are not sanitized that leads to
XSS.

----------------------------------------
Vulnerable Code:
----------------------------------------

File Name: testfiles/advanced-custom-fields/core/views/meta_box_fields.php

Found at line:97
<div class="field field_type-<?php echo $field['type']; ?>
field_key-<?php echo $field['key']; ?>" data-type="<?php echo
$field['type']; ?>" data-id="<?php echo $field['key']; ?>">

Found at line:105
<a class="acf_edit_field row-title" title="<?php _e("Edit this
Field",'acf'); ?>" href="javascript:;"><?php echo $field['label']; ?></a>

Found at line:113
<td class="field_name"><?php echo $field['name']; ?></td>

Found at line:251
<input class="conditional-logic-field" type="hidden" name="fields[<?php
echo $field['key']; ?>][conditional_logic][rules][<?php echo $rule_i;
?>][field]" value="<?php echo $rule['field']; ?>" />

----------------------------------------
POC:
----------------------------------------
https://0x62626262.files.wordpress.com/2016/05/advanced-custom-fields-xss1.png

Fix:
No Fix

Vulnerability Disclosure Timeline:
→ April 24, 2016 – Contact to Vendor via support
→ April 24, 2015 – Vendor Response
→ April 27, 2015 – Bug Report Sent
→ April 27, 2015 – Vendor Response, asked for more info
→ April 28, 2015 – More info sent
→ April 29, 2015 – No fix. To do list for version 5.0

Pub Ref:
https://0x62626262.wordpress.com/2016/05/01/advanced-custom-fields-auth-xss-vulnerability

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