n.runs AG
http://www.nruns.com/                              security(at)nruns.com
n.runs-SA-2008.006                                           11-Sep-2008
________________________________________________________________________

Vendor:                The Horde Project, http://www.horde.org/
Affected Products:     Horde >= 3.2, Horde <= 3.2.1
Vulnerability:         Cross-Site Scripting in filename MIME attachments
CVE:                   CVE-2008-3823
oCERT:                 oCERT-2008-012
Risk:                  CRITICAL
________________________________________________________________________

Vendor communication:


   2008/07/25    Bug found and PoC preparation
   2008/07/26    Vulnerability report submitted via oCert online-form
   2008/08/05    oCert confirmed the submission. oCert starts the
                 coordination of affected authors/vendors
   2008/09/06    oCert informs all parties about the advisory release
                 date
   2008/09/11    n.runs AG releases this advisory in coordination with
                 oCert

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Overview:

The Horde project is about creating high quality Open Source
applications, based on PHP and the Horde Framework.

The guiding principles of the Horde Project are to create solid
standards-based applications using intelligent object-oriented design
that, wherever possible, are designed to run on a wide range of
platforms and backends. There is great emphasis on making Horde as
friendly to non-English speakers as possible. The Horde Framework
currently supports many localization features such as unicode and
right-to-left text and generous users have contributed many translations
for the framework and applications.

Currently Horde Project boasts many applications, some already
enterprise-ready and deployed in demanding environments, and some
exciting new ones still in development.


Description:

The Horde Framework fails to properly sanitize the filename of MIME
attachments on received emails.


Impact:

While a webmail user is viewing an email with a malicously prepared
filename attachment, the attacker can highjack victim's account.
This allows him to send emails on behalf of the victim or to do other
arbitrary actions.


Solution:

For detailed information about the fixes, follow the link in the
references section [1] of this document.

________________________________________________________________________

Credits:
Bug found by Alexios Fakos of n.runs AG.

Many thanks to Will Drewry of oCert team for the coordination and
professional communication.
________________________________________________________________________

References:
[1] http://www.ocert.org/advisories/ocert-2008-012.html

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________________________________________________________________________

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direct, indirect, incidental, consequential, loss of business profits or
special damages, even if n.runs has been advised of the possibility of
such damages.

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