Privilege escalation in multiple Lenovo products

1) Input validation error

EUVDB-ID: #VU62364

Risk: Low

CVSSv3.1: 7.1 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2021-3970

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 in LenovoVariable SMI Handler. A local user can run a specially crafted program to execute arbitrary code with elevated privileges.

Mitigation

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

Vulnerable software versions

Lenovo Legion S7-15IMH5: All versions

Lenovo Legion S7-15ARH5: All versions

ideapad 5-15IIL05: All versions

ideapad 3-17IML05: All versions

ideapad 3-15ITL6: All versions

ideapad 3-15ITL05: All versions

ideapad 3-15IML05: All versions

ideapad 3-14ITL6: All versions

ideapad 3-14ITL05: All versions

ideapad 3-14IML05: All versions

ideapad Yoga Slim 9-14ITL05: All versions

ideapad Yoga Slim 7 Pro-14ITL5: All versions

ideapad Yoga Slim 7 Pro-14IHU5 O: All versions

ideapad Yoga Slim 7 Pro-14IHU5: All versions

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

ideapad Yoga Slim 7 Pro-14ACH5: All versions

ideapad Yoga C940-14IIL: All versions

Lenovo Yoga C740-15IML: All versions

Lenovo Yoga C740-14IML: All versions

ideapad Yoga 7-14ACN6: All versions

Lenovo V17 G2-ITL: All versions

Lenovo V15 G2-ITL: All versions

Lenovo V15 G1-IML: All versions

Lenovo V14 G2-ITL: All versions

Lenovo V14 G1-IML: All versions

ideapad Slim 9-14ITL05: All versions

IdeaPad Slim 7 Pro-14IHU5: All versions

ideapad S540-13IML: All versions

Lenovo S14 G2 ITL: All versions

Lenovo Legion 5-15IMH6: All versions

ideapad L3-15IML05: All versions

IdeaPad 3-17ITL6: All versions

ideapad Flex 3-11ADA05: 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.