#VU60271 Buffer overflow in AhciBusDxe - CVE-2021-43522

Vulnerability identifier: #VU60271

Vulnerability risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2021-43522

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
AhciBusDxe
Hardware solutions / Drivers

Vendor: Insyde Software

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in SMM. A remote attacker can write fixed or predictable data to SMRAM, trigger memory corruption and execute arbitrary code on the target system with elevated privileges.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

AhciBusDxe: before 5.1: 05.14.34

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

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.