Privilege escalation in SMM driver on AMD processors

1) Buffer overflow

EUVDB-ID: #VU79242

Risk: Low

CVSSv4.0: 5.9 [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-2023-20555

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error within the CpmDisplayFeatureSmm in SMM driver. A local user can trigger memory corruption and execute arbitrary code with elevated privileges.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

AMD Ryzen 3000 Series Desktop processors: All versions

AMD Ryzen 5000 Series Desktop Processors: All versions

AMD Ryzen 5000 Series Desktop processor with Radeon graphics: All versions

AMD Ryzen 7000 Series Processors: All versions

AMD Athlon 3000 Series Desktop Processors with Radeon Graphics: All versions

AMD Ryzen 4000 Series Desktop processors with Radeon graphics: All versions

AMD Athlon 3000 Series Mobile processors with Radeon Graphics: All versions

AMD Ryzen 3000 Series Mobile Processors with Radeon Graphics: All versions

AMD Ryzen 4000 Series Mobile processors with Radeon graphics: All versions

AMD Ryzen 5000 Series Mobile processors with Radeon graphics: All versions

AMD Ryzen 6000 Series Mobile Processors: All versions

AMD Ryzen 7030 Series Mobile Processors: All versions

AMD Ryzen 7020 Series Mobile Processors: All versions

CPE2.3

• cpe:2.3:h:amd:amd_ryzen_3000_series_desktop_processors:*:*:*:*:*:*:*:*
• cpe:2.3:h:amd:amd_ryzen_5000_series_desktop_processors:*:*:*:*:*:*:*:*
• cpe:2.3:h:amd:amd_ryzen_5000_series_desktop_processor_with_radeon_graphics:*:*:*:*:*:*:*:*
• cpe:2.3:h:amd:amd_ryzen_7000_series_processors:*:*:*:*:*:*:*:*
• cpe:2.3:h:amd:amd_athlon_3000_series_desktop_processors_with_radeon_graphics:*:*:*:*:*:*:*:*
• cpe:2.3:h:amd:amd_ryzen_4000_series_desktop_processors_with_radeon_graphics:*:*:*:*:*:*:*:*
• cpe:2.3:h:amd:amd_athlon_3000_series_mobile_processors_with_radeon_graphics:*:*:*:*:*:*:*:*
• cpe:2.3:h:amd:amd_ryzen_3000_series_mobile_processors_with_radeon_graphics:*:*:*:*:*:*:*:*
• cpe:2.3:h:amd:amd_ryzen_4000_series_mobile_processors_with_radeon_graphics:*:*:*:*:*:*:*:*
• cpe:2.3:h:amd:amd_ryzen_5000_series_mobile_processors_with_radeon_graphics:*:*:*:*:*:*:*:*
• cpe:2.3:h:amd:amd_ryzen_6000_series_mobile_processors:*:*:*:*:*:*:*:*
• cpe:2.3:h:amd:amd_ryzen_7030_series_mobile_processors:*:*:*:*:*:*:*:*
• cpe:2.3:h:amd:amd_ryzen_7020_series_mobile_processors:*:*:*:*:*:*:*:*

External links

https://www.amd.com/en/resources/product-security/bulletin/amd-sb-4003.html

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.