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GHSA-r29h-37fj-x2w6
No affected components available
Summary
There is a Cross-Site Scripting vulnerability in Open WebUI SVG renderer implementation.
Details
It is possible permanently save any HTML/JavaScript code in the application, which can be then executed in the context of the application domain. This behaviour can be used to extract and steal sensitive data from the application, manipulate DOM tree or being used in complex client-side attacks.
Detailed step-by-step instruction provided below. Please keep me updated about assigned CVE identifier. I'd like to be credited as: Jakub Żoczek [Securitum]
PoC
Steps to reproduce:
To reproduce this vulnerability you need to:
- Login to Open WebUI
- Start new conversation / thread
- Use prompt: "Hey. Can you draw me a green circle using SVG ?"
- SVG image should be generated.
- Now it's possible to edit the code by simply clicking on it and adding additional code. Add payload
<img src=a onerror=alert(document.domain)> - The whole code should look like this:
<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg">
<circle cx="50" cy="50" r="40" fill="green"/>
</svg><img src="a" onerror="alert(document.domain)">ok</img>
- Now clicking "Save", the new image should get rendered, and malicious code - executed (by popping alert).
Such thread could be then shared and sent to other users.
Impact
Cross-Site Scripting allows attacker to execute malicious code in context of victim's browser. This way it could be used in malicious client-side attack achieving different things, depends on attacker's goal. Such thread with rendered SVG could be shared to other user (or administrator) and gain sensitive data or even takeover someone's account.
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges.
Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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