SB2022110130 - Multiple vulnerabilities in Lenovo Notebook LCFC BIOS

Description

This security bulletin contains information about 5 secuirty vulnerabilities.

1) Buffer overflow (CVE-ID: CVE-2022-3742)

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

The vulnerability exists due to a boundary error in LCFC BIOS. A local user can trigger memory corruption and execute arbitrary code with elevated privileges.

2) Information disclosure (CVE-ID: CVE-2022-3743)

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

The vulnerability exists due to an error within the LCFC BIOS implementation. A local user can enumerate Embedded Controller (EC) commands and use them to escalate privileges on the system.

3) Use of hard-coded credentials (CVE-ID: CVE-2022-3744)

The vulnerability allows an attacker to compromise the affected system.

The vulnerability exists due to usage of hard-coded SMI handler credentials in LCFC BIOS. An attacker with physical access to device can unlock UEFI variables and compromise the affected system.

4) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2022-3745)

The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists in LCFC BIOS due to improperly imposed security restrictions. A local user can view incoming and returned data from SMI.

5) Improper access control (CVE-ID: CVE-2022-3746)

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to exposed Embedded Controller (EC) interface in LCFC BIOS. A local user can access to the exposed controller interface and cause some peripherals to work abnormally.

Remediation

Install update from vendor's website.

References

• https://support.lenovo.com/us/en/product_security/LEN-103710