SB2022110130 - Multiple vulnerabilities in Lenovo Notebook LCFC BIOS

Description

This security bulletin contains information about 5 vulnerabilities.

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

CWE-ID: CWE-119 - Memory corruption

CVSSv4: 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

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)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

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

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)

CWE-ID: CWE-798 - Use of Hard-coded Credentials

CVSSv4: CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

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)

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

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

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)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear

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