n.runs AG
http://www.nruns.com/ security(at)nruns.com
n.runs-SA-2008.006 11-Sep-2008
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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
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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.
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Credits:
Bug found by Alexios Fakos of n.runs AG.
Many thanks to Will Drewry of oCert team for the coordination and
professional communication.
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References:
[1] http://www.ocert.org/advisories/ocert-2008-012.html
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