Github Outside Collaborator Detected

 1title: Github Outside Collaborator Detected
 2id: eaa9ac35-1730-441f-9587-25767bde99d7
 3status: test
 4description: |
 5        Detects when an organization member or an outside collaborator is added to or removed from a project board or has their permission level changed or when an owner removes an outside collaborator from an organization or when two-factor authentication is required in an organization and an outside collaborator does not use 2FA or disables 2FA.
 6author: Muhammad Faisal (@faisalusuf)
 7date: 2023-01-20
 8references:
 9    - https://docs.github.com/en/organizations/keeping-your-organization-secure/managing-security-settings-for-your-organization/reviewing-the-audit-log-for-your-organization#audit-log-actions
10    - https://docs.github.com/en/organizations/keeping-your-organization-secure/managing-two-factor-authentication-for-your-organization/requiring-two-factor-authentication-in-your-organization
11tags:
12    - attack.privilege-escalation
13    - attack.persistence
14    - attack.collection
15    - attack.t1098.001
16    - attack.t1098.003
17    - attack.t1213.003
18logsource:
19    product: github
20    service: audit
21    definition: 'Requirements: The audit log streaming feature must be enabled to be able to receive such logs. You can enable following the documentation here: https://docs.github.com/en/enterprise-cloud@latest/admin/monitoring-activity-in-your-enterprise/reviewing-audit-logs-for-your-enterprise/streaming-the-audit-log-for-your-enterprise#setting-up-audit-log-streaming'
22detection:
23    selection:
24        action:
25            - 'org.remove_outside_collaborator'
26            - 'project.update_user_permission'
27    condition: selection
28falsepositives:
29    - Validate the actor if permitted to access the repo.
30    - Validate the Multifactor Authentication changes.
31level: medium