Vulnerability 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.
CVSS Score
CRITICAL
Related Weaknesses (CWE)
References
- https://forum.proxmox.com/threads/proxmox-virtual-environment-security-advisorie
- https://git.proxmox.com/?p=pve-access-control.git;a=commit;h=032e7d6d441f89a48ca
- https://git.proxmox.com/?p=pve-access-control.git;a=commit;h=032e7d6d441f89a48ca
- https://git.proxmox.com/?p=pve-access-control.git;a=commit;h=032e7d6d441f89a48ca
- https://git.proxmox.com/?p=pve-access-control.git;a=commit;h=032e7d6d441f89a48ca
- https://git.proxmox.com/?p=pve-access-control.git;a=commit;h=0f3d14d6be4d9f23e51
- https://www.vulncheck.com/advisories/proxmox-ve-authentication-bypass-via-tfa-ch
FAQ
What is CVE-2023-54391?
CVE-2023-54391 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 exis...
How severe is CVE-2023-54391?
CVE-2023-54391 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2023-54391?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.