SB2022041801 - Multiple vulnerabilities in Lenovo products
Published: April 18, 2022
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 3 vulnerabilities.
1) Input validation error (CVE-ID: CVE-2021-3970)
CWE-ID: CWE-20 - Improper input validation
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 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.
2) Security restrictions bypass (CVE-ID: CVE-2021-3971)
CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/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 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.
3) Security restrictions bypass (CVE-ID: CVE-2021-3972)
CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/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 an error in driver used during manufacturing process and was mistakenly not deactivated. A local privileged user can modify secure boot setting by modifying an NVRAM variable and bypass implemented security restrictions.
Remediation
Install update from vendor's website.