#VU60278 Buffer overflow in SmmResourceCheckDxe - CVE-2021-33626

Vulnerability identifier: #VU60278

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-2021-33626

CWE-ID: CWE-119

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
SmmResourceCheckDxe
Hardware solutions / Drivers

Vendor: Insyde Software

Description

The vulnerability allows a local user to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in SMM (System Management Mode) branch that registers a SWSMI handler. A local user can trigger memory corruption and execute arbitrary code on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

SmmResourceCheckDxe: before 5.1: 05.16.23

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External links
https://www.insyde.com/security-pledge/SA-2021001
https://www.insyde.com/security-pledge

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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.