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From:david.kurz_(at)_majorsecurity.net <david.kurz_(at)_majorsecurity.net>
Date:18 января 2011 г.
Subject:[MajorSecurity SA-081]Contao CMS 2.9.2 - Persistent Cross Site Scripting Issue

[MajorSecurity SA-081]Contao CMS 2.9.2 - Persistent Cross Site Scripting Issue

Product: Contao CMS 2.9.2
Security-Risk: moderated
Remote-Exploit: yes
Vendor-URL: http://www.contao.org/
Advisory-Status: published

Discovered by: David Vieira-Kurz

Affected Products:
Contao CMS 2.9.2
Prior versions may also be vulnerable

"Contao is an open source content management system (CMS) for people who want a
professional internet presence that is easy to maintain." - from www.contao.org

More Details
I have discovered some vulnerabilities in Contao CMS 2.9.2, which can be exploited
by malicious people to conduct persistent cross-site scripting attacks. Input
passed directly over the "HTTP_X_FORWARDED_FOR" header in
"/system/libraries/Environment.php" is not properly sanitised before being stored
and returned to the user out from the "/system/modules/comments/Comments.php" file
when the user browses the "/contao/main.php?do=comments" site. This can be
exploited to execute arbitrary HTML and script code in a user's browser session in
context of an affected site.

Update to the patched version 2.9.3.

2010-12-24, vendor informed ( see ticket 2751 )
2011-01-01, vendor confirmed the issue
2011-01-06, vendor relased a patched version(2.9.3)
2011-01-12, advisory published

Use of terms
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Use of the advisory constitutes acceptance for use in an "as is" condition. All
warranties are excluded. In no event shall MajorSecurity be liable for any damages
whatsoever including direct, indirect, incidental, consequential, loss of business
profits or special damages, even if MajorSecurity has been advised of the
possibility of such damages.

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