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Cross-Site Scripting (XSS) in qTranslate WordPress Plugin

Advisory ID:HTB23265
Product:qTranslate WordPress plugin
Vendor:Qian Qin
Vulnerable Versions:2.5.39 and probably prior
Tested Version:2.5.39
Advisory Publication:July 1, 2015 [without technical details]
Vendor Notification:July 1, 2015
Public Disclosure:July 29, 2015
Latest Update:July 29, 2015
Vulnerability Type:Cross-Site Scripting [CWE-79]
CVE Reference:CVE-2015-5535
Risk Level:Medium
CVSSv2 Base Score:4.3 (AV:N/AC:M/Au:N/C:N/I:P/A:N)
Discovered and Provided:High-Tech Bridge Security Research Lab
 

Advisory Details:

High-Tech Bridge Security Research Lab discovered vulnerability in qTranslate WordPress plugin, which can be exploited to perform Cross-Site Scripting (XSS) attacks against website administrators. Successful exploitation of this vulnerability may allow a remote attacker to gain complete control over the web application, if the victim visits a malicious page with XSS exploit. This vulnerability can also be used to perform drive-by-download or phishing attacks against website administrators.

Input passed via "edit" HTTP GET parameter to "/wp-admin/options-general.php" is not properly sanitised before being returned to the user. A remote attacker can trick a logged-in administrator to open a specially crafted link and execute arbitrary HTML and script code in browser in context of the vulnerable website.

A simple exploit below will display a JS popup with "ImmuniWeb" word:

http://wordpress/wp-admin/options-general.php?page=qtranslate&edit=%22%3E%3C script%3Ealert%28%2FImmuniWeb%2F%29%3B%3C%2Fscript%3E

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Solution:
Disclosure timeline:
2015-07-01 Vendor notified via email, no reply.
2015-07-10 Vendor notified via emails and support thread on the WordPress plugin page, no reply.
2015-07-17 Vendor notified via emails, no reply.
2015-07-28 Fix requested via emails, no reply.
2015-07-29 Public disclosure.

Currently we are not aware of any official solution from the vendor. As at temporary solution we strongly recommend disabling the vulnerable plugin.


References:
[1] High-Tech Bridge Advisory HTB23265 - https://www.immuniweb.com/advisory/HTB23265 - Cross-Site Scripting (XSS) in qTranslate WordPress Plugin.
[2] qTranslate WordPress plugin - http://www.qianqin.de/ - qTranslate makes creation of multilingual content as easy as working with a single language.
[3] Common Vulnerabilities and Exposures (CVE) - http://cve.mitre.org/ - international in scope and free for public use, CVE® is a dictionary of publicly known information security vulnerabilities and exposures.
[4] Common Weakness Enumeration (CWE) - http://cwe.mitre.org - targeted to developers and security practitioners, CWE is a formal list of software weakness types.
[5] ImmuniWeb® - Leveraging the power of machine-learning and genius of human brain to deliver the most advanced web application security and penetration testing.
[6] ImmuniWeb® SSLScan - Test your servers for security and compliance with PCI DSS, HIPAA and NIST.
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