Vulnerability identifier: #VU94742

Vulnerability risk: Low

CVSSv3.1: 2.8 [CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-31347

CWE-ID: CWE-264

Exploitation vector: Local

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 local user to modify data on other guests.

The vulnerability exists due to improper privilege management in Secure_TSC, SEV firmware. A local user can cause a guest to observe an incorrect TSC when Secure TSC is enabled potentially resulting in a loss of guest integrity.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

3rd Gen AMD EPYC Processors: All versions

4th Gen AMD EPYC Processors: All versions

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External links
http://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-3007

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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.