Описание
Open WebUI Vulnerable to Arbitrary File Upload and Path Traversal
CONFIDENTIAL
KL-CAN-2024-002
Vulnerability Details
| # | Field | Value |
|---|---|---|
| 1 | Discoverer | Jaggar Henry & Sean Segreti of KoreLogic, Inc. |
| 2 | Date Submitted | 2024.03.12 |
| 3 | Title | Open WebUI Arbitrary File Upload + Path Traversal |
| 5 | Affected Vendor | Open WebUI |
| 6 | Affected Product(s) | Open WebUI (Formerly Ollama WebUI) |
| 7 | Affected Version(s) | 0.1.105 |
| 8 | Platform/OS | Debian GNU/Linux 12 (bookworm) |
| 9 | Vector | HTTP web interface |
| 10 | CWE | CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'), CWE-434: Unrestricted Upload of File with Dangerous Type |
4. High-level Summary
Attacker controlled files can be uploaded to arbitrary locations on the web server's filesystem by abusing a path traversal vulnerability.
11. Technical Analysis
When attaching files to a prompt by clicking the plus sign (+) on the left of the message input box when using the Open WebUI HTTP interface, the file is uploaded to a static upload directory.
The name of the file is derived from the original HTTP upload request and is not validated or sanitized. This allows for users to upload files with names containing dot-segments in the file path and traverse out of the intended uploads directory. Effectively, users can upload files anywhere on the filesystem the user running the web server has permission.
This can be visualized by examining the python code for the /rag/api/v1/doc API route:
The file variable is a representation of the multipart form data contained within the HTTP POST request. The filename variable is derived from the uploaded file name and is not validated before writing the file contents to disk.
This can be used to upload malicious models. These models are often distributed as pickled python objects and can be leveraged to execute arbitrary python bytecode once deserialized. Alternatively, an attacker can leverage existing services, such as SSH, to upload an attacker controlled authorized_keys file to remotely connect to the machine.
12. Proof-of-Concept
Execute the following cURL command:
Verify the file pwned.txt exists in the /tmp/ directory on the machine hosting the web server:
Пакеты
open-webui
<= 0.1.123
0.1.124
Связанные уязвимости
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.1.124, when attaching files to a promp, the name of the file is derived from the original HTTP upload request and is not validated or sanitized. This allows for users to upload files with names containing dot-segments in the file path and traverse out of the intended uploads directory. Effectively, users can upload files anywhere on the filesystem the user running the web server has permission. This vulnerability is fixed in 0.1.124.
Уязвимость веб-интерфейса на базе искусственного интеллекта Open WebUI, связанная с неограниченной загрузкой файлов опасного типа, позволяющая нарушителю обойти существующие механизмы безопасности и загружать произвольные файлы