osTicket 1.12 Formula Injection

Risk: Low
Local: No
Remote: Yes

CVSS Base Score: 6.8/10
Impact Subscore: 6.4/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

# Exploit Title: osTicket-v1.12 Formula Injection # 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-2019-14749 1. Description An issue was discovered in osTicket before 1.10.7 and 1.12.x before 1.12.1. CSV (aka Formula) injection exists in the export spreadsheets functionality. These spreadsheets are generated dynamically from unvalidated or unfiltered user input in the Name and Internal Notes fields in the Users tab, and the Issue Summary field in the tickets tab. This allows other agents to download data in a .csv file format or .xls file format. This is used as input for spreadsheet applications such as Excel and OpenOffice Calc, resulting in a situation where cells in the spreadsheets can contain input from an untrusted source. As a result, the end user who is accessing the exported spreadsheet can be affected. https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-14749 2. Proof of Concept Steps to Reproduce: - Login as an agent and under the "Users" section create a new user. - Insert the crafted payload of Formula Injection into "Name" and "Internal Notes" field. - Login as another agent and under the Users tab, click on export and then save the ".csv" file. - It is observed that the payload gets executed in excel and this leads to remote code execution. - Not just an agent, even a non-agent user has the option to edit his name where he can insert the malicious payload of Formula Injection. - The application does not sanitize the inputs here due to which when the agent clicks on export the payload gets executed. -The same issue persisted in the "Issue Summary" field in the tickets tab. 3. Reference https://github.com/osTicket/osTicket/commit/99818486c5b1d8aa445cee232825418d6834f249 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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