id: CVE-2021-21985

info:
  name: VMware vSphere Client (HTML5) RCE
  author: D0rkerDevil
  severity: critical
  description: |
    The vSphere Client (HTML5) contains a remote code execution vulnerability due to lack of input validation in the Virtual SAN Health Check plug-in which is enabled by default in vCenter Server. A malicious actor with network access to port 443 may exploit this issue to execute commands with unrestricted privileges on the underlying operating system that hosts vCenter Server.
  reference:
    - https://nvd.nist.gov/vuln/detail/CVE-2021-21985
    - https://www.vmware.com/security/advisories/VMSA-2021-0010.html
    - https://github.com/alt3kx/CVE-2021-21985_PoC
  tags: cve,cve2021,rce,vsphere
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.80
    cve-id: CVE-2021-21985
    cwe-id: CWE-20

requests:
  - raw:
      - |
        POST /ui/h5-vsan/rest/proxy/service/com.vmware.vsan.client.services.capability.VsanCapabilityProvider/getClusterCapabilityData HTTP/1.1
        Host: {{Hostname}}
        Accept: */*
        Content-Type: application/json

        {"methodInput":[{"type":"ClusterComputeResource","value": null,"serverGuid": null}]}

    matchers:
      - type: word
        words:
          - '{"result":{"isDisconnected":'
        part: body