#VU97954 Incomplete cleanup in 4th Gen AMD EPYC Processors - CVE-2023-20518

Vulnerability identifier: #VU97954

Vulnerability risk: Low

CVSSv4.0: 0.2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-20518

CWE-ID: CWE-459

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
4th Gen AMD EPYC Processors
Hardware solutions / Firmware

Vendor: AMD

Description

The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists due to incomplete cleanup in the ASP. A local privileged user with access to the BIOS menu or UEFI shell can obtain the Master Encryption Key (MEK).

Mitigation
Install updates from vendor's website.

Vulnerable software versions

4th Gen AMD EPYC Processors: before GenoaPI 1.0.0.4

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External links
https://www.amd.com/en/resources/product-security/bulletin/amd-sb-3003.html

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.