Privilege escalation in Dell AMI UEFI BIOS firmware

1) Input validation error

EUVDB-ID: #VU83166

Risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-39535

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to insufficient validation of user-supplied input within the UEFI/BIOS firmware. A local user can escalate privileges on the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Wyse 5070: before 1.24.0

Inspiron 3510: before 1.17.0

Vostro 3582: before 1.20.0

Latitude 3190 2-In-1: before 1.28.0

Latitude 3190: before 1.28.0

Inspiron 3782: before 1.20.0

Inspiron 3502: before 1.14.0

Inspiron 3482: before 1.20.0

Inspiron 15 3521: before 1.12.0

CPE2.3

• cpe:2.3:h:dell:wyse_5070:*:*:*:*:*:*:*:*
• cpe:2.3:h:dell:inspiron_3510:*:*:*:*:*:*:*:*
• cpe:2.3:h:dell:vostro_3582:*:*:*:*:*:*:*:*
• cpe:2.3:h:dell:latitude_3190_2-in-1:*:*:*:*:*:*:*:*
• cpe:2.3:h:dell:latitude_3190:*:*:*:*:*:*:*:*
• cpe:2.3:h:dell:inspiron_3782:*:*:*:*:*:*:*:*
• cpe:2.3:h:dell:inspiron_3502:*:*:*:*:*:*:*:*
• cpe:2.3:h:dell:inspiron_3482:*:*:*:*:*:*:*:*
• cpe:2.3:h:dell:inspiron_15_3521:*:*:*:*:*:*:*:*

External links

https://www.dell.com/support/kbdoc/nl-nl/000216238/dsa-2023-220-security-update-for-an-ami-uefi-bios-vulnerability

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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