#VU60266 Insecure Default Variable Initialization in AhciBusDxe - CVE-2021-41841

Vulnerability identifier: #VU60266

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-2021-41841

CWE-ID: CWE-453

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 the SMM (System Management Mode) branch that registers a SWSMI handler does not sufficiently check or validate the allocated table variables EFI_BOOT_SERVICES and EFI_RUNTIME_SERVICES. A remote attacker can overwrite address location of the LocateHandleBuffer function and execute arbitrary code on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

AhciBusDxe: before 5.0: 05.08.29

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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.