Multiple Cross-Site Scripting (XSS) vulnerabilities in GetSimple CMS

[advisory@xxxxxxxxxxxx]

Advisory ID: HTB23141
Product: GetSimple CMS
Vendor: get-simple.info
Vulnerable Version(s): 3.1.2 and probably prior
Tested Version: 3.1.2
Vendor Notification: January 23, 2013 
Vendor Patch: April 26, 2013 
Public Disclosure: May 1, 2013 
Vulnerability Type: Cross-Site Scripting [CWE-79]
CVE Reference: CVE-2013-1420
Risk Level: Low 
CVSSv2 Base Score: 2.6 (AV:N/AC:H/Au:N/C:N/I:P/A:N)
Solution Status: Fixed by Vendor
Discovered and Provided: High-Tech Bridge Security Research Lab ( 
https://www.htbridge.com/advisory/ ) 

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Advisory Details:

High-Tech Bridge Security Research Lab discovered multiple vulnerabilities in 
GetSimple CMS, which can be exploited to perform Cross-Site Scripting (XSS) 
attacks. The application has XSS filter, however it can be bypassed as 
demonstrated below.


1) Cross-Site Scripting (XSS) in GetSimple CMS: CVE-2013-1420

1.1 The vulnerability exists due to insufficient sanitisation of user-supplied 
data passed via the "id" HTTP GET parameter to "/admin/backup-edit.php" script. 
A remote attacker can trick a logged-in administrator to open a specially 
crafted link and execute arbitrary HTML and script code in browser in context 
of the vulnerable website.

The exploitation example below uses the "alert()" JavaScript function to 
display administrator's cookies: 

http://[host]/admin/backup-edit.php?p=1&id=";><scri<script></script>pt>alert(document.cookie);</scri<script></script>pt>


1.2 The vulnerability exists due to insufficient sanitisation of user-supplied 
data passed via the "path" HTTP GET parameter to "/admin/upload.php" script. A 
remote attacker can trick a logged-in administrator to open a specially crafted 
link and execute arbitrary HTML and script code in browser in context of the 
vulnerable website.

The exploitation example below uses the "alert()" JavaScript function to 
display administrator's cookies: 

http://[host]/admin/upload.php?path=";><scri<script></script>pt>alert(document.cookie);</scri<script></script>pt>


1.3 The vulnerability exists due to insufficient sanitisation of user-supplied 
data passed via the "title" and "menu" HTTP GET parameters to "/admin/edit.php" 
script. A remote attacker can trick a logged-in administrator to open a 
specially crafted link and execute arbitrary HTML and script code in browser in 
context of the vulnerable website.

The exploitation examples below use the "alert()" JavaScript function to 
display administrator's cookies:

http://[host]/admin/edit.php?title=";><scri<script></script>pt>alert(document.cookie);</scri<script></script>pt>
http://[host]/admin/edit.php?menu=";><scri<script></script>pt>alert(document.cookie);</scri<script></script>pt>


1.4 The vulnerability exists due to insufficient sanitisation of user-supplied 
data passed via the "path" and "returnid" HTTP GET parameters to 
"/admin/filebrowser.php" script. A remote attacker can trick a logged-in 
administrator to open a specially crafted link and execute arbitrary HTML and 
script code in browser in context of the vulnerable website.

The exploitation examples below use the "alert()" JavaScript function to 
display administrator's cookies:

http://[host]/admin/filebrowser.php?path=";><scri<script></script>pt>alert(document.cookie);</scri<script></script>pt>
http://[host]/admin/filebrowser.php?returnid=";><scri<script></script>pt>alert(document.cookie);</scri<script></script>pt>


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Solution:

Upgrade to GetSimple CMS 3.2.1

More Information:
http://get-simple.info/start/changelog
http://get-simple.info/download

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References:

[1] High-Tech Bridge Advisory HTB23141 - 
https://www.htbridge.com/advisory/HTB23141 - Multiple Cross-Site Scripting 
(XSS) vulnerabilities in GetSimple CMS.
[2] GetSimple CMS - http://get-simple.info/ - GetSimple is an XML based, 
stand-a-alone, fully independant and lite Content Management System.
[3] Common Vulnerabilities and Exposures (CVE) - http://cve.mitre.org/ - 
international in scope and free for public use, CVE® is a dictionary of 
publicly known information security vulnerabilities and exposures.
[4] Common Weakness Enumeration (CWE) - http://cwe.mitre.org - targeted to 
developers and security practitioners, CWE is a formal list of software 
weakness types. 

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Disclaimer: The information provided in this Advisory is provided "as is" and 
without any warranty of any kind. Details of this Advisory may be updated in 
order to provide as accurate information as possible. The latest version of the 
Advisory is available on web page [1] in the References.