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Silverstripe CMS 2.3.4 Cross Site Scripting

Silverstripe CMS 2.3.4 Cross Site Scripting
Posted Jan 22, 2010
Authored by Moritz Naumann

Silverstripe CMS versions 2.3.4 and below suffer from cross site scripting vulnerabilities.

tags | exploit, vulnerability, xss
SHA-256 | 0709ec68a83de79a2eab0dcab8bac9db071789e7d93d937708c1035b8c8e8658

Silverstripe CMS 2.3.4 Cross Site Scripting

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Silverstripe CMS, <http://silverstripe.org/>, version 2.3.4 and lower
(and its unreleased 2.4 branch), is vulnerable to two Cross Site
Scripting issues.

1. The comment posting mechanism of Silverstripe ('PostCommentForm')
fails to properly sanitize the 'CommenterURL' parameter. This allows for
persistent injection of HTML or javascript code within existing HTML tags.

2. The forum module is vulnerable to a reflective XSS issue caused by
the search script failing to properly sanitize input to the 'Search'
parameter. When invoking this URL:
SILVERSTRIPESITE/forums/search/?Search=%22%20onmouseover=%22javascript:alert%280%29;%22
trying to reorder the search results will trigger execution of the
injected javascript code.


According to its quickly responding developers, Silverstripe version
2.3.5 fixes both issues:
http://groups.google.com/group/silverstripe-announce/browse_thread/thread/f51749342eee9456

Relevant SCM changesets:
http://open.silverstripe.org/changeset/97034
http://open.silverstripe.org/changeset/97070
http://open.silverstripe.org/changeset/97073
http://open.silverstripe.org/changeset/97074
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