CVE-2024-50344

I, Librarian (Free) - Stored XSS

I, Librarian is an open-source version of a PDF managing SaaS.

Supplemental Files are allowed to be viewed in the browser, only if they have a white-listed MIME type. Unfortunately, this logic is broken, thus allowing unsafe files containing Javascript to be executed with the application context. An attacker can exploit this vulnerability by uploading a supplementary file that contains a malicious code or script. This code will then be executed when the file is loaded in the browser.

The vulnerability was fixed in version 5.11.2.

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Steps to Reproduce

1. Login and upload a malicious HTML file containing any JavaScript payload.

2. Exploit the file download functionality to display any file inside the browser by injecting the response's Content-Disposition header.

3. To do that, navigate to the malicious HTML supplement file and edit the download link by adding the extra parameter "&disposition", without even specifying any value for it.

4. This causes the web application's response to set the Content-Disposition header's value to inline.

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References

• https://github.com/mkucej/i-librarian-free

• https://nvd.nist.gov/vuln/detail/CVE-2024-50344

• https://github.com/mkucej/i-librarian-free/security/advisories/GHSA-c2rm-w62w-5xmj

• https://i-librarian.net/