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Nuclei Templates

Polyfill.io - Backdoor

ID: polyfill-backdoor

Severity: info

Author: kazet

Tags: cdn,polyfill-io,backdoor,malware

Description

Section titled “Description”

The polyfill.io CDN was suspected to serve malware. Note: it’s not exploitable anymore

YAML Source

Section titled “YAML Source”
id: polyfill-backdoor


info:
  name: Polyfill.io - Backdoor
  author: kazet
  severity: info
  description: |
    The polyfill.io CDN was suspected to serve malware. Note: it's not exploitable anymore
  reference:
    - https://sansec.io/research/polyfill-supply-chain-attack
    - https://web.archive.org/web/20240229113710/https://github.com/polyfillpolyfill/polyfill-service/issues/2834
    - https://blog.cloudflare.com/polyfill-io-now-available-on-cdnjs-reduce-your-supply-chain-risk
  metadata:
    verified: true
    max-request: 1
    shodan-query: html:"polyfill.io"
  tags: cdn,polyfill-io,backdoor,malware


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


    redirects: true
    max-redirects: 1


    matchers-condition: and
    matchers:
      - type: regex
        part: body
        regex:
          - "<script[^>]* src=['\"]https?://([a-zA-Z0-9-]*.)?polyfill.io[/'\"]"
# digest: 4a0a0047304502204dd739a9cbd81f5bc54e9e8a6e52c97be8be5d7a72052000469a5802d9e37502022100fffc5b40c2c09747f4361e682c21d59b2420e96b1e89693abd29a90337369929:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

Section titled “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.

Terminal window
$ nuclei -u "URL" -t "http/vulnerabilities/backdoor/polyfill-backdoor.yaml"

View on Github