#VU75920 Input validation error in 2nd Gen AMD EPYC Processors and 3rd Gen AMD EPYC Processors - CVE-2021-46769

Vulnerability identifier: #VU75920

Vulnerability risk: Low

CVSSv4.0: 5.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-46769

CWE-ID: CWE-20

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
2nd Gen AMD EPYC Processors
Hardware solutions / Firmware
3rd Gen AMD EPYC Processors
Hardware solutions / Firmware

Vendor: AMD

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to insufficient syscall validation in the ASP Bootloader. A local privileged user can execute arbitrary DMA copies and escalate privileges on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

2nd Gen AMD EPYC Processors: before RomePI 1.0.0.E

3rd Gen AMD EPYC Processors: before MilanPI 1.0.0.9

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External links
https://www.amd.com/en/resources/product-security/bulletin/amd-sb-3001.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.