Untrusted Pointer Dereference in Insyde AhciBusDxe driver

1) Untrusted Pointer Dereference

EUVDB-ID: #VU60274

Risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-41837

CWE-ID: CWE-822 - Untrusted Pointer Dereference

Exploit availability: No

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 5.5: 05.51.41

External links

http://www.insyde.com/security-pledge

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.