n.runs AG
http://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
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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 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] http://www.ocert.org/advisories/ocert-2008-012.html
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