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NOCC Cross Site Scripting Vulnerability
15 May 2002
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-----BEGIN PGP SIGNED MESSAGE----- ppp-design found the following cross-site-scripting bug in NOCC:

Details
- -------
Product: NOCC
Affected Version: 0.9.5 and maybe all versions before
Immune Version: none, authors are working on it
OS affected: all OS with php and mysql
Vendor-URL: http://nocc.sourceforge.net/
Vendor-Status: informed, working on a new version
Security-Risk: high
Remote-Exploit: Yes

Introduction
- ------------
NOCC is a webmail client written in PHP. It provides webmail access to IMAP and POP3 accounts. Unfortunatly the software displays a message without checking for any malicous code.

More details
- ------------
A mail (even a text mail) is rendered as html. So a possible blackhat can include any malicous code in an email and get full access to any mailbox easily.

Proof-of-concept
- ----------------
Just write an email to any NOCC user with the following text inside:

<script>alert(document.cookie)</script>

When the user is reading his mail a popup will come up showing his session id. Of course there are many other possibilities to make use of this bug.

Temporary-fix
- -------------
Users could disable Javascript but because there are still other possiblilities to enter malicious code, this will only stop this proof-of-concept from working.

Fix
- ---
None at the moment, but the authors are allready working on a new version.

Security-Risk
- -------------
Because the software is widly spreaded according to their website, and any blackhat can easily get full access to any emailaccount that is managed using NOCC, we are rating the securtiy risk to high.

Vendor status
- -------------
We have informed the core developers, who reacted fastly and in a recommedable way. They entered the bug to their bugzilla system. So there is no need for us to wait with this publication, allthough there is no fix ready until now.

Disclaimer
- ----------
All information that can be found in this advisory is believed to be true, but maybe it isn't. ppp-design can not be held responsible for the use or missuse of this information. Redistribution of this text is only permitted if the text has not been altered and the original author ppp-design (http://www.ppp-design.de) is mentioned.

This advisory can be found online at:
http://www.ppp-design.de/advisories.php

ppp-design
http://www.ppp-design.de
Public-Key: http://www.ppp-design.de/pgp/ppp-design.asc



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