#VU97945 Improper Initialization in 3rd Gen AMD EPYC Processors and 4th Gen AMD EPYC Processors - CVE-2023-20591

Vulnerability identifier: #VU97945

Vulnerability risk: Medium

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-20591

CWE-ID: CWE-665

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
3rd Gen AMD EPYC Processors
Hardware solutions / Firmware
4th Gen AMD EPYC Processors
Hardware solutions / Firmware

Vendor: AMD

Description

The vulnerability allows a malicious guest to compromise the affected system.

The vulnerability exists due to improper initialization of IOMMU during the DRTM event. A malicious guest can read or modify hypervisor memory.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

3rd Gen AMD EPYC Processors: before MilanPI 1.0.0.B

4th Gen AMD EPYC Processors: before GenoaPI 1.0.0.8

---

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

---

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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