Mastodon Prototype Pollution Vulnerability

mediumseverity

6.1CVSS score

4.4%likelihood of exploitation, next 30 days

92%of all CVEs are less likely

Readycheck to confirm it

The GitHub repository mastodon/mastodon prior to 3.5.0 contains a Prototype Pollution vulnerability.

Impact

Remote code execution

Fix

Apply the latest security patches and updates provided by the Mastodon project to mitigate the vulnerability.

How to confirm it

Send: GET {{BaseURL}}/embed.js
Positive when: contains "if (data.type !== 'setHeight' || !iframes[data.id]) {" AND status 200

Run it with nuclei: nuclei -id CVE-2022-0432 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2022-0432

info:
  name: Mastodon Prototype Pollution Vulnerability
  author: pikpikcu
  severity: medium
  description: The GitHub repository mastodon/mastodon prior to 3.5.0 contains a Prototype Pollution vulnerability.
  impact: |
    Remote code execution
  remediation: |
    Apply the latest security patches and updates provided by the Mastodon project to mitigate the vulnerability.
  reference:
    - https://github.com/mastodon/mastodon/commit/4d6d4b43c6186a13e67b92eaf70fe1b70ea24a09
    - https://drive.google.com/file/d/1vpZ0CcmFhTEUasLTPUBf8o-4l7G6ojtG/view
    - https://nvd.nist.gov/vuln/detail/CVE-2022-0432
    - https://huntr.dev/bounties/d06da292-7716-4d74-a129-dd04773398d7
    - https://github.com/ARPSyndicate/cvemon
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    cvss-score: 6.1
    cve-id: CVE-2022-0432
    cwe-id: CWE-1321
    epss-score: 0.04429
    epss-percentile: 0.91452
    cpe: cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: joinmastodon
    product: mastodon
  tags: cve,cve2022,mastodon,prototype,huntr,joinmastodon,vuln

http:
  - method: GET
    path:
      - '{{BaseURL}}/embed.js'

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - "if (data.type !== 'setHeight' || !iframes[data.id]) {"

      - type: status
        status:
          - 200

References

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