Security features bypass in AMD products - CVE-2021-39298

Vulnerability identifier: #VU63729

CSH Severity: Low

CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

CVE-ID: CVE-2021-39298

CWE-ID: CWE-254

Exploitation vector: Local access

Exploit availability: No public exploit available

Vendor: AMD

Affected software:
AMD Ryzen 2000 series Desktop processor
AMD Ryzen 5000 Series Desktop processor with Radeon graphics
3rd Gen AMD Ryzen Threadripper processors
AMD Ryzen Threadripper PRO processors
AMD Ryzen 2000 Series Mobile processor
AMD Ryzen 3000 Series Mobile processor
2nd Gen AMD Ryzen Mobile processor with Radeon graphics
AMD Athlon 3000 Series Mobile processors with Radeon Graphics
AMD Ryzen 3000 Series Mobile processor with Radeon graphics
AMD Ryzen 5000 Series Mobile processor with Radeon graphics

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

The vulnerability exists due to unspecified error in AMD System Management Mode (SMM) interrupt handler. A local privileged user can bypass security mechanisms provided in the UEFI firmware and execute arbitrary code.

Install updates from vendor's website.

• https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1027