Log Connections Disabled for PostgreSQL Database Instances

ID: gcloud-sql-log-connections-disabled

Severity: medium

Author: princechaddha

Tags: cloud,devops,gcp,gcloud,google-cloud-sql,gcp-cloud-config

Description

Ensure that the “log_connections” database flag is enabled for your Google Cloud PostgreSQL database instances. The “log_connections” flag causes each attempted connection to the database instance to be logged, including successful client authentication requests. This flag helps with monitoring and auditing database access. Only PostgreSQL database administrators can change this parameter at session start, and it cannot be changed after the session starts.

YAML Source

id: gcloud-sql-log-connections-disabled

info:
  name: Log Connections Disabled for PostgreSQL Database Instances
  author: princechaddha
  severity: medium
  description: |
    Ensure that the "log_connections" database flag is enabled for your Google Cloud PostgreSQL database instances. The "log_connections" flag causes each attempted connection to the database instance to be logged, including successful client authentication requests. This flag helps with monitoring and auditing database access. Only PostgreSQL database administrators can change this parameter at session start, and it cannot be changed after the session starts.
  impact: |
    If "log_connections" is not enabled, you may lose critical information about database connections, impacting monitoring and security auditing capabilities.
  remediation: |
    Enable the "log_connections" database flag for your PostgreSQL instances in Google Cloud. This can be done by updating the instance settings and applying the change.
  reference:
    - https://cloud.google.com/sql/docs/postgres/configure-database-flags
  tags: cloud,devops,gcp,gcloud,google-cloud-sql,gcp-cloud-config

flow: |
  code(1)
  for(let projectId of iterate(template.projectIds)){
    set("projectId", projectId)
    code(2)
    for(let sqlInstance of iterate(template.sqlInstances)){
      set("sqlInstance", sqlInstance)
      code(3)
    }
  }

self-contained: true

code:
  - engine:
      - sh
      - bash
    source: |
      gcloud projects list --format="json(projectId)"

    extractors:
      - type: json
        name: projectIds
        internal: true
        json:
          - '.[].projectId'

  - engine:
      - sh
      - bash
    source: |
      gcloud sql instances list --project $projectId --filter='DATABASE_VERSION:POSTGRES*' --format="json(name)"

    extractors:
      - type: json
        name: sqlInstances
        internal: true
        json:
          - '.[].name'

  - engine:
      - sh
      - bash
    source: |
      gcloud sql instances describe $sqlInstance --format="json(settings.databaseFlags)" | jq '.[] | select(.name=="log_connections") | .value'

    matchers:
      - type: word
        words:
          - 'off'

    extractors:
      - type: dsl
        dsl:
          - '"Log Connections flag is disabled for PostgreSQL instance " + sqlInstance + " in project: " + projectId'
# digest: 4b0a0048304602210098225a47fca34612b19b9cfe7699abd9bb62d6292510e790bd3bcf464f223a200221008c9489a0d0ee6feda8bc7517eec86ae3b94fafc42b815f6d6d558ce56ba3acce:922c64590222798bb761d5b6d8e72950

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.

$ nuclei -u "URL" -t "cloud/gcp/sql/gcloud-sql-log-connections-disabled.yaml"

View on Github