by Kastro
Paper/Archive/CVE-2023-54391

CVE-2023-54391

Proxmox Server Solutions GmbH Proxmox Virtual Environment (VE) — Proxmox VE 7.0-8.0 Authentication Bypass via tfa-challenge Parameter

EPSS 3%CVSS 9.8
critical.is priorityof 100
47
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 87.4.874 × 2017.5No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
Proxmox Virtual Environment (VE)7.0 – 7.4–CNA
Proxmox Virtual Environment (VE)8.0–CNA

Scores by source

VulnCheck (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
VulnCheck (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

advisoryforum.proxmox.com/threads/proxmox-virtual-environment-security-advisories.149331/page-4#post-867929patchgit.proxmox.com/?p=pve-access-control.git;a=commit;h=032e7d6d441f89a48cadfd7f47e957c8a561c022refgit.proxmox.com/?p=pve-access-control.git;a=commit;h=0f3d14d6be4d9f23e511701696a529ef3b7ffd61writeupvulncheck.com/advisories/proxmox-ve-authentication-bypass-via-tfa-challenge-parameter