osTicket 1.12 File Upload Cross Site Scripting

2019.08.12
Risk: High
Local: No
Remote: Yes


CVSS Base Score: 3.5/10
Impact Subscore: 2.9/10
Exploitability Subscore: 6.8/10
Exploit range: Remote
Attack complexity: Medium
Authentication: Single time
Confidentiality impact: None
Integrity impact: Partial
Availability impact: None

# Exploit Title: osTicket-v1.12 Stored XSS via File Upload # Vendor Homepage: https://osticket.com/ # Software Link: https://osticket.com/download/ # Exploit Author: Aishwarya Iyer # Contact: https://twitter.com/aish_9524 # Website: https://about.me/aish_iyer # Category: webapps # CVE: CVE-2019-14748 1. Description An issue was discovered in osTicket before 1.10.7 and 1.12.x before 1.12.1. The Ticket creation form allows users to upload files along with queries. It was found that the file-upload functionality has fewer (or no) mitigations implemented for file content checks; also, the output is not handled properly, causing persistent XSS that leads to cookie stealing or malicious actions. For example, a non-agent user can upload a .html file, and Content-Disposition will be set to inline instead of an attachment. https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-14748 2. Proof of Concept Steps to Reproduce: - Login to the portal as a non agent user: - Open a New Ticket - Select any option from the dropdown menu present under "Help Topic" - Text box appears, enter details accordingly - In the section "drop files here or choose them", we would be putting our payload - Open any text editor and name the file as test(say) with .html extension. - Within the file, enter the payload <script>alert(document.cookie);</script> - Save the test.html file. - Now click on drop files here option and enter the test.html file. - Click on "create ticket" option - Login with another user(agent) - Now within the User Directory, go to the user under which the payload has been put. - The ticket raised with the name mentioned will be shown under the subject category. - Scroll down and the file uploaded will be present below. - Click on the file, and the payload gets executed which is persistent 3. Reference https://github.com/osTicket/osTicket/commit/33ed106b1602f559a660a69f931a9d873685d1ba https://github.com/osTicket/osTicket/releases/tag/v1.12.1 https://github.com/osTicket/osTicket/releases/tag/v1.10.7 4. Solution The vulnerability has been patched by the vendor in the next release which is osTicket v1.10.7. -- Best Regards, Aishwarya Iyer https://about.me/aish_iyer


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