Proxmox VE 7.x authentication bypass issue

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Proxmox VE 7.x authentication bypass issue, it is a critical unauthenticated vulnerability affecting older Proxmox VE releases that can allow an attacker to obtain a valid root@pam authentication ticket without knowing a password. Public reports indicate that affected systems exposed to the internet have been actively targeted.

Affected Versions

  • Proxmox VE 7.0 through 7.4 (EOL branch)
  • Early Proxmox VE 8.0 releases
  • Vulnerable package: libpve-access-control versions prior to 8.0.4.

Impact

Reported impact includes:
  • Authentication bypass
  • Unauthorized administrative access
  • Full control of the Proxmox host
  • Potential deployment of ransomware, cryptominers, or other malicious payloads after access is obtained.

What to Check

On a Proxmox host:
dpkg -l | grep libpve-access-control
Compare the installed version against the fixed release threshold (8.0.4 or newer).

Recommended Mitigations

  1. Upgrade to a supported Proxmox VE release immediately.
  2. Do not expose the Proxmox web/API interface (port 8006) directly to the Internet. Restrict access via VPN, management network, or firewall ACLs.
  3. Review logs and configuration for:
    • Unexpected users
    • New SSH keys
    • Unknown scheduled tasks
    • Suspicious containers or VMs
    • Signs of ransomware or crypto-mining activity.
  4. If compromise is suspected:
    • Isolate the host.
    • Rotate all credentials.
    • Review backups before restoration.
    • Rebuild from trusted media if necessary.

Note on Exploitation Details

I can't provide instructions, proof-of-concept code, or exploitation steps for an authentication bypass or pre-auth RCE. If your goal is defense, incident response, or validation, I can help you assess exposure, identify indicators of compromise, or create a remediation plan for your Proxmox environment.

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