#VU79242 Buffer overflow in AMD products - CVE-2023-20555

Vulnerability identifier: #VU79242

Vulnerability 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

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
AMD Ryzen 3000 Series Desktop processors
Hardware solutions / Firmware
AMD Ryzen 5000 Series Desktop Processors
Hardware solutions / Firmware
AMD Ryzen 5000 Series Desktop processor with Radeon graphics
Hardware solutions / Firmware
AMD Ryzen 7000 Series Processors
Hardware solutions / Firmware
AMD Athlon 3000 Series Desktop Processors with Radeon Graphics
Hardware solutions / Firmware
AMD Ryzen 4000 Series Desktop processors with Radeon graphics
Hardware solutions / Firmware
AMD Athlon 3000 Series Mobile processors with Radeon Graphics
Hardware solutions / Firmware
AMD Ryzen 3000 Series Mobile Processors with Radeon Graphics
Hardware solutions / Firmware
AMD Ryzen 4000 Series Mobile processors with Radeon graphics
Hardware solutions / Firmware
AMD Ryzen 5000 Series Mobile processors with Radeon graphics
Hardware solutions / Firmware
AMD Ryzen 6000 Series Mobile Processors
Hardware solutions / Firmware
AMD Ryzen 7030 Series Mobile Processors
Hardware solutions / Firmware
AMD Ryzen 7020 Series Mobile Processors
Hardware solutions / Firmware

Vendor: AMD

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: before ComboAM4 PI V1 1.0.0.A

AMD Ryzen 5000 Series Desktop Processors: before ComboAM4 V2 PI 1.2.0.A

AMD Ryzen 5000 Series Desktop processor with Radeon graphics: before ComboAM4v2 PI 1.2.0.A

AMD Ryzen 7000 Series Processors: before ComboAM5 1.0.0.6

AMD Athlon 3000 Series Desktop Processors with Radeon Graphics: before ComboAM4PIv1 1.0.0.A

AMD Ryzen 4000 Series Desktop processors with Radeon graphics: before ComboAM4V2 1.2.0.A

AMD Athlon 3000 Series Mobile processors with Radeon Graphics: before PicassoPI-FP5 1.0.0.F

AMD Ryzen 3000 Series Mobile Processors with Radeon Graphics: before PicassoPI-FP5 1.0.0.F

AMD Ryzen 4000 Series Mobile processors with Radeon graphics: before RenoirPI-FP6 1.0.0.B

AMD Ryzen 5000 Series Mobile processors with Radeon graphics: before CezannePI-FP6 1.0.0.E

AMD Ryzen 6000 Series Mobile Processors: before RembrandtPI-FP7 1.0.0.8

AMD Ryzen 7030 Series Mobile Processors: before CezannePI-FP6 1.0.0.E

AMD Ryzen 7020 Series Mobile Processors: before MendocinoPI-FT6 1.0.0.5

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