Intercom Identity Verification Misconfiguration

ID: intercom-identity-misconfiguration

Severity: medium

Author: domwhewell-sage

Tags: intercom,unauth,exposure,misconfig

Description

Identity Verification is not setup on the Intercom widget, allowing an attacker to impersonate a user and access their chat history.

YAML Source

id: intercom-identity-misconfiguration

info:
  name: Intercom Identity Verification Misconfiguration
  author: domwhewell-sage
  severity: medium
  description: |
    Identity Verification is not setup on the Intercom widget, allowing an attacker to impersonate a user and access their chat history.
  reference:
    - https://medium.com/@hellother18/uncovering-a-vulnerability-in-intercom-widget-chat-configuration-e5633d06df60
    - https://www.intercom.com/help/en/articles/183-set-up-identity-verification-for-web-and-mobile
  tags: intercom,unauth,exposure,misconfig

variables:
  user_email: "[email protected]"

flow: http(1) && http(2)

http:
  - method: GET
    path:
      - "{{BaseURL}}"

    redirects: true
    max-redirects: 3

    matchers:
      - type: word
        words:
          - "app_id:"
        internal: true

    extractors:
      - type: regex
        name: intercom_app_id
        part: body
        group: 1
        regex:
          - 'app_id:\s*"([a-zA-Z0-9\-]+)"'
        internal: true

  - method: POST
    path:
      - "https://api-iam.intercom.io/messenger/web/ping"

    body: |
      app_id={{intercom_app_id}}&user_data={"email":"{{user_email}}"}

    matchers:
      - type: status
        status:
          - 200

    extractors:
      - type: dsl
        dsl:
          - Input
# digest: 4a0a00473045022028190efeb0390c4eccce2954ac93fda17c5654dce6d0af237bdf7289eb58d178022100caefb1b838e7b59252c17494f76806f25b78a218a5913940996f82c8a394f925:922c64590222798bb761d5b6d8e72950

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/intercom-identity-misconfiguration.yaml"

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