#VU60274 Untrusted Pointer Dereference in AhciBusDxe - CVE-2021-41837

Vulnerability identifier: #VU60274

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-2021-41837

CWE-ID: CWE-822

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
AhciBusDxe
Hardware solutions / Drivers

Vendor: Insyde Software

Description

The vulnerability allows a remote attacker to escalate privileges on the system.

The vulnerability exists due to untrusted pointer dereference error in SMM (System Management Mode) branch that registers a SWSMI handler. A remote attacker can use this unsafe pointer "current_ptr" to read or write or manipulate data into SMRAM.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

AhciBusDxe: before 5.0: 05.08.41

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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.