#VU75524 Path traversal in Jellyfin - CVE-2023-30626

Vulnerability identifier: #VU75524

Vulnerability risk: Medium

CVSSv4.0: 6.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-30626

CWE-ID: CWE-22

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Jellyfin
Client/Desktop applications / Other client software

Vendor: Jellyfin

Description

The vulnerability allows a remote attacker to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences. A remote user can send a specially crafted HTTP request and read arbitrary files on the system, leading to arbitrary code execution.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Jellyfin: 10.0.0 - 10.8.9

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External links
https://github.com/jellyfin/jellyfin/security/advisories/GHSA-9p5f-5x8v-x65m
https://github.com/jellyfin/jellyfin/pull/5918
https://github.com/jellyfin/jellyfin/commit/82ad2633fdfb1c37a158057c7935f83e1129eda7
https://github.com/jellyfin/jellyfin/blob/22d880662283980dec994cd7d35fe269613bfce3/Jellyfin.Api/Controllers/ClientLogController.cs#L44
https://github.com/jellyfin/jellyfin/releases/tag/v10.8.10
https://github.com/jellyfin/jellyfin-web/security/advisories/GHSA-89hp-h43h-r5pq

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.