GitLab - Repository visibility to Public

Status: available
Severity: medium
Time window: 1d
Source: github.com/Azure/Azure-Sentinel

'This query leverages GitLab Audit Logs. A repository in GitLab changed visibility from Private or Internal to Public which could indicate compromise, error or misconfiguration leading to exposing the repository to the public.'

MITRE ATT&CK coverage

Tactic	Techniques
Persistence	`T1556` Modify Authentication Process
Credential Access	`T1556` Modify Authentication Process

Rule body

id: 8b291c3d-90ba-4ebf-af2c-0283192d430e
name: GitLab - Repository visibility to Public
description: |
  'This query leverages GitLab Audit Logs. A repository in GitLab changed visibility from Private or Internal to Public which could indicate compromise, error or misconfiguration leading to exposing the repository to the public.'
severity: Medium
status: Available
requiredDataConnectors:
  - connectorId: SyslogAma
    dataTypes: 
      - Syslog
queryFrequency: 1h
queryPeriod: 1d
triggerOperator: gt
triggerThreshold: 0
tactics:
  - Persistence
  - DefenseEvasion
  - CredentialAccess
relevantTechniques:
  - T1556
query: |
  GitLabAudit
  | where SourceVisibility != "Public" and ChangeType == "visibility" and TargetVisibility == "Public"
  | project TimeGenerated, EventTime, IPAddress, AuthorName, ChangeType, TargetType, SourceVisibility,  TargetVisibility, EntityName
entityMappings:
  - entityType: IP
    fieldMappings:
      - identifier: Address
        columnName: IPAddress
  - entityType: Account
    fieldMappings:
      - identifier: FullName
        columnName: AuthorName
  - entityType: URL
    fieldMappings:
      - identifier: Url
        columnName: EntityName        
version: 1.0.1
kind: Scheduled

Stages and Predicates

Stage 1: `source`

GitLabAudit

Stage 2: `where`

| where SourceVisibility != "Public" and ChangeType == "visibility" and TargetVisibility == "Public"

Stage 3: `project`

| project TimeGenerated, EventTime, IPAddress, AuthorName, ChangeType, TargetType, SourceVisibility,  TargetVisibility, EntityName

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`ChangeType`	eq	`visibility`	`field:"ChangeType" kind:eq value:"visibility"`
`SourceVisibility`	ne	`Public`	`field:"SourceVisibility" kind:ne value:"Public"`
`TargetVisibility`	eq	`Public`	`field:"TargetVisibility" kind:eq value:"Public"`

Output fields

These fields are emitted when the rule matches.

Field	Source
`AuthorName`	`project`
`ChangeType`	`project`
`EntityName`	`project`
`EventTime`	`project`
`IPAddress`	`project`
`SourceVisibility`	`project`
`TargetType`	`project`
`TargetVisibility`	`project`
`TimeGenerated`	`project`