Security restrictions bypass in multiple Lenovo products

1) Security restrictions bypass

EUVDB-ID: #VU62365

Risk: Low

CVSSv3.1: 6.1 [CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2021-3971

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

Exploit availability: No

Description

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

The vulnerability exists due to an error in driver used during older manufacturing processes and was mistakenly included in the BIOS image. A local privileged user can modify firmware protection region by changing an NVRAM variable and bypass implemented security restrictions.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

ideapad Yoga Slim 7 Pro-14ACH5 O: All versions

ideapad Yoga Slim 7 Pro-14ACH5: All versions

External links

http://support.lenovo.com/lu/uk/product_security/LEN-73440

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.