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

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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.

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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] https://www.ocert.org/advisories/ocert-2008-012.html

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________________________________________________________________________

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