full-disclosure - n.runs-SA-2008.007 - Cross-Site Scripting Filter Evasion in various frameworks / applications

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Date: Thu, 11 Sep 2008 15:11:22 +0200
From: "security@...ns.com" <security@...ns.com>
To: full-disclosure@...ts.grok.org.uk
Subject: n.runs-SA-2008.007 - Cross-Site Scripting Filter
 Evasion in various frameworks / applications

n.runs AG
http://www.nruns.com/                              security(at)nruns.com
n.runs-SA-2008.007                                           11-Sep-2008
________________________________________________________________________

Vendor:                Various
Affected Products:     Horde >= 3.1, <= 3.2.1
                        Popoon/Flux-CMS <= r22196
                        Secondary, affected versions:
                        Cake-PHP <= 1.2.x.x_18.08.2008 (nightly)
                        phpMyFAQ <= 2.5.0-dev (2008-08-18)
                        deluxeBB <= 1.2
                        emucms <= 0.3
                        SimpleSite <= 1.6.4
                        RevokeBB <= 1.0RC11_normal
                        TPLN <= 2.9
                        Logicoder <= r27
                        phour <= r106
                        MDPro <= 1.0821
                        noserub <= r784/0.6
                        and probably more
Vulnerability:         Cross-Site Scripting Filter Evasion in various
                        frameworks / applications
CVE:                   CVE-2008-3824
oCERT:                 oCERT-2008-012
Risk:                  MEDIUM
________________________________________________________________________

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

________________________________________________________________________

Overview:

The Horde project relies on code similar to Popoon's externalinput.php
to filter out potential XSS attacks on user-supplied input. Other
projects are using the same code base. Therefore this vulnerability
affects also the popular Cake-PHP framework. Hence, all users that
rely on the externalinput sanitization functionality are affected by
this vulnerability, as in addition to many other unrelated, open source
projects.

Description:

The XSS filter fails to fully sanitize the user data. In particular,
this filter fails to protect against a special character which
Microsoft Internet Explorer and Mozilla Firefox is interpreting it
as a valid space character.

Impact:

This circumstance allows to bypass the filter and to apply
Cross-Site Scripting.

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

This Advisory and Upcoming Advisories:
http://www.nruns.com/security_advisory.php

Subscribe to the n.runs newsletter by signing up to:
http://www.nruns.com/newsletter_en.php

________________________________________________________________________

Unaltered electronic reproduction of this advisory is permitted. For all
other reproduction or publication, in printing or otherwise, contact
security@...ns.com for permission. Use of the advisory constitutes
acceptance for use in an "as is" condition. All warranties are excluded.
In no event shall n.runs be liable for any damages whatsoever including
direct, indirect, incidental, consequential, loss of business profits or
special damages, even if n.runs has been advised of the possibility of
such damages.

Copyright 2008 n.runs AG. All rights reserved. Terms of use apply.

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