1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU60285

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-2021-43323

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

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

The vulnerability exists due to the SMM callout issue. A remote attacker can hijack execution flow of a code running in System Management Mode and escalate privileges.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

UsbCoreDxe: before 5.5: 05.51.45, 5.4: 05.43.45, 5.3: 05.35.45, 5.2: 05.26.45, 5.1: 05.16.45, 5.0: 05.08.45

---

CPE2.3

• cpe:2.3:h:insyde_software:usbcoredxe:*:*:*:*:*:*:*:*
• Full software list in CPE2.3 format available after registration.

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.