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Date: Thu, 28 Jul 2016 12:05:00 +0200
From: Vulnerability Lab <>
Subject: [FD] Saveya Bounty #1 - Bypass & Persistent Vulnerability

Document Title:
Saveya Bounty #1 - Bypass & Persistent Vulnerability

References (Source):

SaveYa ID: 56


Release Date:

Vulnerability Laboratory ID (VL-ID):

Common Vulnerability Scoring System:

Product & Service Introduction:
As one of the leading gift card exchanges, SaveYa passes along the savings to you by buying unwanted gift cards. In turn, gift cards from many popular 
retailers are sold at a discount, below face value, and you can save big time on your everyday or one time expenses. Browse or search our extensive list 
of discounted gift cards for today’s most popular retailers before you make that next big purchase. If you are a shopper on the go, you can download our 
discount gift card app to save even more instantly. Our one of a kind savings app alerts you before checkout in order to take advantage of potential 
savings by buying discounted gift cards.

(Copy of the Vendor Homepage: )

Abstract Advisory Information:
The vulnerability laboratory core research team discovered an application-side input validation vulnerability and filter bypass issue in the Saveya web-application.

Vulnerability Disclosure Timeline:
2016-06-15: Researcher Notification & Coordination (Benjamin Kunz Mejri)
2016-06-17 Vendor Notification (Saveya Security Team - Bug Bounty Program)
2016-06-18: Vendor Response/Feedback (Saveya Security Team - Bug Bounty Program)
2016-07-25: Vendor Fix/Patch (Saveya Site Service Developer Team)
2016-07-26: Public Disclosure (Vulnerability Laboratory)

Discovery Status:

Affected Product(s):
Product: Saveya - Online Service (Web-Application) 2016 Q2

Exploitation Technique:

Severity Level:

Technical Details & Description:
An application-side input validation and mail encode web vulnerability has been discovered in the official Saveya online service web-application.
The application-side vulnerability allows remote attacker to inject own malicious script codes to the application-side of the vulnerable module or function.

The vulnerability is located in the `Firstname` and `Lastname` parameter values of the `./Register` module POST method request. Remote attackers are able 
to inject own malicious script codes to the application-side of the profile values. After the registration a confirm and verification email is send by the 
service with the firstname and lastname values in the message body. Thus values are wrong encoded and can execute persistent injected script codes.

The security risk of the application-side mail encode web vulnerability is estimated as medium with a cvss (common vulnerability scoring system) count of 3.8. 
Exploitation of the persistent input validation web vulnerability requires no privileged web-application user account and low or medium user interaction. 
Successful exploitation of the vulnerability results in session hijacking, persistent phishing attacks, persistent external redirects to malicious source 
and persistent manipulation of affected or connected application modules.

Request Method(s):
				[+] POST

Vulnerable Module(s):
				[+] Register - Account Registration SaveYa

Vulnerable Parameter(s):
				[+] Firstname
				[+] Lastname

Affected Module(s):
				[+] Verify Email
				[+] Account Congratulation Email

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

Manual steps to reproduce the vulnerability ...
1. Open the Saveya website
2. Click to Signup module
3. The registration form opens
4. Inject random values and a target attack email to include via POST
5. Inject to the Firstname and Lastname input field values your own malicious script code
6. Save the request via POST submit
7. Check the inbox
8. First the email of the verify arrives and after that the email congratulation account to verify
Note: In both emails the persistent injected script code executes in the message body context
9. Successful reproduce of the remote mail encode web vulnerability and input validation issue

PoC #1: Welcome Email
<tr><td> <table style="border-spacing:0;border-collapse:collapse;width:100%">
<td style="padding-top:20px;">
<p>Welcome "&gt;&lt;"[PERSISTENT INJECTED SCRIPT CODE EXECUTE!]<img src="x">%20%20&gt;"<iframe src="a">%20<iframe>!</p>
<p><p>We are excited to start your savings! To maintain a safe gift card exchange for our Buyers and Sellers, click the following link to confirm your email</p>
<a href=""></a>

PoC #2: Congratulations Email Account
<table style="border-spacing:0;border-collapse:collapse;width:100%">
<td style="padding-top:20px;">
<p>Congratulations "&gt;&lt;"[PERSISTENT INJECTED SCRIPT CODE EXECUTE!]<img src="x">%20%20&gt;"<iframe src="a">%20<iframe>!</p>
<p>We&#39;re excited to have you join the millions of people who love a great deal and are using technology to discover the best savings.</p>
<p style="padding-top:20px">Log in now and let&#39;s start saving! 
<a href=";utm_medium=email&amp;utm_campaign=signup"></a></p>

--- PoC Session Logs [POST] ---
Status: 302[Found]
Mime Type[text/html]
   Request Header:
      User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:47.0) Gecko/20100101 Firefox/47.0]
      Accept-Encoding[gzip, deflate, br]
      Cookie[PHPSESSID=33v3vavabp7hagmti0dgb47f50; device_view=full; saveya_cart_token=48c646fbf38b7a8ea2a7d61e98046157c76983bce6198447ce488adaf4887a8c; 
_ga=GA1.2.1932054624.1466150590; GSIDjkWRttymeafj=1af66ccb-deae-441d-b2e4-5ef9217c94c3; STSD190022=0; STSID190022=59c3febf-a651-4e83-9bb1-85755c92113f; 
D_SID=; D_PID=1CFD7DCE-572E-3764-9239-4718E145198D; D_IID=6239827F-3F71-3084-846B-29ACC3BC0F30; 
D_UID=C6C6ABC7-6CC3-3B8C-AD5E-793C07AB3C06; D_HID=2J0KBBFZ4q4uK+XfSbYf98AeSaLG/WqQqRlOQY5Upeg; ltk-subscribed=Account; _dc_gtm_UA-56192108-1=1]
   Response Header:
      Date[Fri, 17 Jun 2016 08:16:41 GMT]
      Content-Type[text/html; charset=UTF-8]


Solution - Fix & Patch:
2016-07-25: Vendor Fix/Patch (Saveya Site Service Developer Team)

Security Risk:
The security risk of the application-side input validation web vulnerability in the saveya online service web-application is estimated as medium. (CVSS 3.7)

Credits & Authors:
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri ( []

Disclaimer & Information:
The information provided in this advisory is provided as it is without any warranty. Vulnerability Lab disclaims all warranties, either expressed or implied, 
including the warranties of merchantability and capability for a particular purpose. Vulnerability-Lab or its suppliers are not liable in any case of damage, 
including direct, indirect, incidental, consequential loss of business profits or special damages, even if Vulnerability-Lab or its suppliers have been advised 
of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing 
limitation may not apply. We do not approve or encourage anybody to break any licenses, policies, deface websites, hack into databases or trade with stolen data.

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