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Advisories

Proxmox VE 7.0-8.0 Authentication Bypass via tfa-challenge Parameter

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severity
critical
date
Affecting

  • Proxmox Virtual Environment (VE) >= 7.0, <= 7.4

CWE
  • CWE-304 Missing Critical Step in Authentication
CVSS
9.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Credit
Kamil Rakowski, Nathan Xavier Golez, Sagnik Sasmal
Description
Proxmox Virtual Environment (VE) 7.0 through 8.0 contains an authentication bypass vulnerability in libpve-access-control before 8.0.4 that allows unauthenticated attackers to authenticate as any existing enabled user without a configured second factor by supplying an arbitrary tfa-challenge value in the API login endpoint. Attackers can send a POST request to the access ticket API endpoint with any value in the tfa-challenge parameter to completely skip password verification, gaining unauthorized access including to the root@pam account. All affected releases are end of life.

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