Limit Network Access to Selected Networks - Disabled

ID: limit-networkaccess-disabled

Severity: medium

Author: DhiyaneshDK

Tags: cloud,devops,aliyun,alibaba,aliyun-cloud-config,alibaba-oss

Description

Limit Network Access to Selected Networks in Alibaba OSS allows you to restrict access to your object storage service (OSS) to specific IP addresses or IP ranges, enhancing security by ensuring that only trusted networks can interact with your data.”

YAML Source

id: limit-networkaccess-disabled

info:
  name: Limit Network Access to Selected Networks - Disabled
  author: DhiyaneshDK
  severity: medium
  description: |
    Limit Network Access to Selected Networks in Alibaba OSS allows you to restrict access to your object storage service (OSS) to specific IP addresses or IP ranges, enhancing security by ensuring that only trusted networks can interact with your data."
  reference:
    - https://www.trendmicro.com/cloudoneconformity/knowledge-base/alibaba-cloud/AlibabaCloud-OSS/publicly-accessible-oss-bucket.html
    - https://www.alibabacloud.com/help/en/oss/user-guide/block-public-access
  metadata:
    max-request: 2
    verified: true
  tags: cloud,devops,aliyun,alibaba,aliyun-cloud-config,alibaba-oss

variables:
  region: "cn-hangzhou"

flow: |
  code(1)
  for (let BucketName of iterate(template.bucketname)) {
    set("bucket", BucketName)
    code(2)
  }

self-contained: true

code:
  - engine:
      - sh
      - bash

    source: |
      aliyun oss ls --region $region

    extractors:
      - type: regex
        name: bucketname
        internal: true
        regex:
          - 'oss://([a-zA-Z0-9-]+)'

  - engine:
      - sh
      - bash

    source: |
      aliyun oss bucket-policy --method get $bucket --region $region

    matchers-condition: and
    matchers:
      - type: word
        words:
          - '"IpAddress":'
          - '"acs:SourceIp":'
        negative: true

      - type: word
        words:
          - '"Principal":'
          - '"Resource":'
          - '"Action":'
        condition: and

    extractors:
      - type: dsl
        dsl:
          - 'bucket + " Limit Network Access to Selected Networks is Disabled "'
# digest: 4a0a0047304502207e35a18d8164528de48029765a8fe55797af61fff934bb5d0b18d47fed41ae9a022100fab60e8b59b6a61f40ea8a69ca9b3e268c81ece8809a37425fc72b11ac7bc5ac: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/alibaba/oss/limit-networkaccess-disabled.yaml"

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