Proxmox VE 7.0-8.0 Authentication Bypass via tfa-challenge Parameter
47Vexday Risk Score
Prioritize patching. It exploitation observed by VulnCheck.
ssvc Actcvss 9.3
from disclosure to weapon
Published on NVDSep 1
VulnCheckSep 1
exploitation probability
—
observed exploitation
yesVulnCheck
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.
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
Affected products
Proxmox Server Solutions GmbH · Proxmox Virtual Environment (VE)References
https://forum.proxmox.com/threads/proxmox-virtual-environment-security-advisories.149331/page-4#post-867929https://git.proxmox.com/?p=pve-access-control.git;a=commit;h=032e7d6d441f89a48cadfd7f47e957c8a561c022https://www.vulncheck.com/advisories/proxmox-ve-authentication-bypass-via-tfa-challenge-parameter