nuget-config-exposure: NuGet.config Package Source Credentials - Exposure

id: nuget-config-exposure

info:
  name: NuGet.config Package Source Credentials - Exposure
  author: ChrisJr404
  severity: high
  description: |
    Detected A NuGet.config file with a packageSourceCredentials section is exposed. NuGet stores per-feed authentication in this section and often keeps it as a ClearTextPassword, so a public copy leaks the username and password used to reach private package feeds.
  reference:
    - https://learn.microsoft.com/en-us/nuget/reference/nuget-config-file
    - https://learn.microsoft.com/en-us/nuget/consume-packages/consuming-packages-authenticated-feeds
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
    cvss-score: 7.5
    cwe-id: CWE-522
  metadata:
    verified: false
    max-request: 3
    google-query: intitle:"index of" "nuget.config"
  tags: exposure,config,nuget,dotnet,credentials,files

http:
  - method: GET
    path:
      - "{{BaseURL}}/nuget.config"
      - "{{BaseURL}}/NuGet.Config"
      - "{{BaseURL}}/.nuget/nuget.config"

    stop-at-first-match: true

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains_all(body, "<configuration>", "packageSourceCredentials", "Username")'
          - 'contains_any(tolower(body), "cleartextpassword", "\"password\"")'
          - '!contains_any(tolower(body), "<html", "<!doctype", "<script", "<meta", "application/json", "application/javascript", "application/x-javascript", "application/xml", "text/xml", "image/", "response xmlns", "mongodb over http")'
        condition: and

    extractors:
      - type: regex
        part: body
        group: 1
        regex:
          - 'key="Username"\s+value="([^"]+)"'
# digest: 4a0a0047304502201c9c9d108d2c1c21d687af63305cf7c591c812b8b64e7933309d8b21e21a1909022100afad2bda1977544a60851db824ef360c262b5792fe94944bccd1c2aea0404010:922c64590222798bb761d5b6d8e72950

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