CMSimple 4.6.2 Cross Site Scripting

`=============================================  
MGC ALERT 2016-004  
- Original release date: May 28, 2016  
- Last revised: June 1, 2016  
- Discovered by: Manuel Garcia Cardenas  
- Severity: 4,8/10 (CVSS Base Score)  
=============================================  
  
I. VULNERABILITY  
-------------------------  
Reflected XSS in CMSimple <= v4.6.2  
  
II. BACKGROUND  
-------------------------  
CMSimple is a php based Content Managemant System (CMS) , which requires no  
database. All data are stored in a simple file system.  
  
III. DESCRIPTION  
-------------------------  
Has been detected a reflected XSS vulnerability in Admin Panel of CMSimple,  
that allows the execution of arbitrary HTML/script code to be executed in  
the context of the victim user's browser.  
  
The code injection is done through the parameter "subdir" in the page  
"userfiles".  
  
IV. PROOF OF CONCEPT  
-------------------------  
Malicious Request:  
/cmsimple/?userfiles&subdir=userfiles/<XSS injection>  
  
Example:  
/cmsimple/?userfiles&subdir=userfiles/<script>alert(1)</script>  
  
V. BUSINESS IMPACT  
-------------------------  
An attacker can execute arbitrary HTML or script code in a targeted user's  
browser, this can leverage to steal sensitive information as user  
credentials, personal data, etc.  
  
VI. SYSTEMS AFFECTED  
-------------------------  
CMSimple <= v4.6.2  
  
VII. SOLUTION  
-------------------------  
Update to version 4.6.3  
  
VIII. REFERENCES  
-------------------------  
http://www.cmsimple.org/  
  
IX. CREDITS  
-------------------------  
This vulnerability has been discovered and reported  
by Manuel Garcia Cardenas (advidsec (at) gmail (dot) com).  
  
X. REVISION HISTORY  
-------------------------  
May 28, 2016 1: Initial release  
June 1, 2016 2: Last revision  
  
XI. DISCLOSURE TIMELINE  
-------------------------  
May 28, 2016 1: Vulnerability acquired by Manuel Garcia Cardenas  
May 28, 2016 2: Send to vendor  
May 30, 2016 3: New version that includes patched code  
http://cmsimple.org/downloadcounter/dlcount/count.php?id=31  
June 1, 2016 4: Sent to lists  
  
XII. LEGAL NOTICES  
-------------------------  
The information contained within this advisory is supplied "as-is" with no  
warranties or guarantees of fitness of use or otherwise.  
  
XIII. ABOUT  
-------------------------  
Manuel Garcia Cardenas  
Pentester  
  
  
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