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[FD] Pinterest Bug Bounty #1 - Persistent contact_name Vulnerability
- To: fulldisclosure@xxxxxxxxxxxx
- Subject: [FD] Pinterest Bug Bounty #1 - Persistent contact_name Vulnerability
- From: Vulnerability Lab <research@xxxxxxxxxxxxxxxxxxxxx>
- Date: Wed, 01 Jul 2015 09:10:00 +0200
Document Title:
===============
Pinterest Bug Bounty #1 - Persistent contact_name Vulnerability
References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1431
Release Date:
=============
2015-06-30
Vulnerability Laboratory ID (VL-ID):
====================================
1431
Common Vulnerability Scoring System:
====================================
3.3
Product & Service Introduction:
===============================
Pinterest is a web and mobile application company that offers a visual
discovery, collection, sharing, and storage tool.
Users create and share the collections of visual bookmarks (boards). Boards are
created through a user selecting an item,
page, website, etc. and pinning it to an existing or newly created board. Users
save and share pins from multiple resources
onto boards based on a plethora of criteria, e.g. similar characteristics, a
theme, birthday parties, planning a vacation,
writing a book, interior decorating, holidays. Boards can develop projects,
organize events, or save pictures and data together.
The site was founded by Ben Silbermann, Paul Sciarra and Evan Sharp. It is
managed by Cold Brew Labs and funded by a small group
of entrepreneurs and investors.
(Copy of the Homepage: http://en.wikipedia.org/wiki/Pinterest )
Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research Team discovered an application-side mail
encoding and validation vulnerability in the official Pinterest online service
web-application.
Vulnerability Disclosure Timeline:
==================================
2015-01-30: Researcher Notification & Coordination (Benjamin Kunz Mejri)
2015-01-31: Vendor Notification (Pinterest Bug Bounty Program)
2015-02-06: Vendor Response/Feedback (Pinterest Bug Bounty Program)
2015-02-18: Vendor Fix/Patch Notification (Pinterest - Developer Team)
2015-06-30: Public Disclosure (Vulnerability Laboratory)
Discovery Status:
=================
Published
Affected Product(s):
====================
Pinterest
Product: Pinterest - Online Service Web Application 2015 Q1
Exploitation Technique:
=======================
Remote
Severity Level:
===============
Medium
Technical Details & Description:
================================
A persistent mail encoding web vulnerability has been discovered in the
official Pinterest Web-Application (API).
The application-side issue allows remote attackers to compromise emails by
injection of own malicious persistent context.
The application-side validation and encoding vulnerability is located in the
`contact_name` value of the User Profile >
Kontaktperson input field. Remote attackers are able to inject on registration
user emails or random mails with script code
in the Kontaktperson input field (contact_name) of the user profile. Remote
attackers can inject the code on registration and
local attackers can use Kontoeinstellungen module. After the inject of
malicious script code the service stores the account
in the database management system. The service captures with the wrong encoding
the user input and sends it in the pinterest
tip to the saved or changed email. The execution of the injected script code
occurs next to the introduction word context `Hallo`.
The attack vector of the issue is located on the application-side of the online
service and the request method to inject is POST.
The security risk of the persistent mail encoding web vulnerability is
estimated as medium with a cvss (common vulnerability scoring system)
count of 3.3. Exploitation of the persistent vulnerability requires a low
privilege pinterest account
with low user interaction. Successful exploitation of the vulnerability results
in session hijacking, persistent phishing attacks, persistent
redirect to external source and persistent manipulation of affected or
connected module context.
Request Method(s):
[+] POST
Vulnerable Module(s):
[+] User Profile
Vulnerable Input(s):
[+] Kontaktperson
Vulnerable Function(s):
[+] contact_name
Affected Module(s):
[+] Pinterest Tips - Mail
(community@xxxxxxxxxxxxx & community@xxxxxxxxxxxxxxxxxxx)
Proof of Concept (PoC):
=======================
The application-side mail encoding web vulnerability can be exploited by local
attackers and remote attackers with medium or high user interaction.
For security demonstration or to reproduce the security vulnerability follow
the provided information and steps below to continue.
Manual steps to reproduce the security vulnerability ...
1. Open the pinterest website and register to the pinterest community
web-application account
2. Include the following string to the name input fields
<script-code>@<script-code>.com
Note: Use Username: admin@xxxxxxxxxxxxxxxxx Password: bugcrowd23
3. Save the settings to add the new account to the pinterest database
Note: Now, you need to wait even if the account is not confirmed the pinterest
tips will arrive
4. The script code execution occurs in the pinterest tip mail next to the Hallo
introduction word context
Note: The issue can be exploited by local and remote accounts. Remote attackers
are able register with random mails without verification to
send the pinterest service pin tips with malicious context.
5. Successful reproduce of the security vulnerability!
PoC: Pin-Tipp: So erstellst du geheime Pinnwände (community@xxxxxxxxxxxxx &
community@xxxxxxxxxxxxxxxxxxx)
</a>
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Hallo [PERSISTENT SCRIPT CODE EXECUTION!]>"<iframe
src=http://www.evolution-sec.com/>@gmail.com
>"<script>alert(document.cookie)</script><div style="1@xxxxxxxxx "><img
src="x" onerror=prompt(23);>,
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Pinnwände sind wie Ordner, in denen du deine Pins sammelst. Du kannst Pinnwände
für alles Mögliche anlegen: z. B. Rezepte zum Ausprobieren, Reiseziele oder
Deko- und Renovierungsideen.
Ruf einfach dein Profil auf und klick oder tipp auf "Pinnwand erstellen".
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Und so geht's
</a>
</td>
</tr>
</table>
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Pinterest-Breed[CORGI]
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Date[Fri, 30 Jan 2015 09:19:21 GMT]
Connection[keep-alive]
-
successful updates profile
10:19:11.102[335ms][total 335ms] Status: 200[OK]
GET https://www.pinterest.com/settings Load Flags[VALIDATE_ALWAYS
LOAD_DOCUMENT_URI LOAD_INITIAL_DOCUMENT_URI ] Größe des Inhalts[-1] Mime
Type[text/html]
Request Header:
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Firefox/35.0]
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Accept-Language[de,en-US;q=0.7,en;q=0.3]
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Cookie[csrftoken=05ANpvbsm3mOhbh8HGQjnpZSeuGtPthI;
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_pinterest_pfob=disabled]
Connection[keep-alive]
Response Header:
Cache-Control[no-cache, no-store, must-revalidate, max-age=0]
Content-Encoding[gzip]
content-security-policy[default-src 'self' https://*.pinterest.com
https://*.pinimg.com *.pinterest.com *.pinimg.com *.google.com
connect.facebook.net *.google-analytics.com https://*.facebook.com
*.facebook.com www.googleadservices.com googleads.g.doubleclick.net
platform.twitter.com *.tiles.mapbox.com *.online-metrix.net 'unsafe-inline'
'unsafe-eval'; frame-src *; img-src *; report-uri
/_/_/csp_report/?a=298645156448463237:lTLp0LmhPATBEJ6e4UZhW1jvEmM]
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Pinterest-Breed[CORGI]
Pinterest-Generated-By[ngapp2-7040ed5d]
Pinterest-Version[6ea2d7a]
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X-Pinterest-RID[927927480513]
x-ua-compatible[IE=edge]
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Date[Fri, 30 Jan 2015 09:19:22 GMT]
Transfer-Encoding[chunked]
Connection[keep-alive, Transfer-Encoding]
Reference(s):
http://pinterest.com
http://community.pinterest.com
http://email.pinterest.com
Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure aprse and encode of the vulnerable
contact_name value in the user profile scheme.
Filter the input of the profile Kontaktperson input field and disallow special
chars to prevent an script code execution in outgoing service emails.
Security Risk:
==============
The security risk of the application-side input validation web vulnerability in
the contact_name value is estimated as medium. (CVSS 3.3)
Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri
(bkm@xxxxxxxxxxxxxxxxx) [www.vulnerability-lab.com]
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=========================
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