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ThinkPad BIOS Vulnerabilities

ThinkPad BIOS Vulnerabilities

ThinkPad BIOS Vulnerabilities

Lenovo Security Advisory: LEN-72619

Potential Impact: Privilege escalation, denial of service

Severity: Medium

Scope of Impact: Lenovo-specific

CVE Identifier: CVE-2021-3718, CVE-2021-3843

 

Summary Description:

The following vulnerabilities were reported in Lenovo ThinkPad BIOS.

CVE-2021-3718: A denial of service vulnerability was reported in some ThinkPad models that could cause a system to crash when the Enhanced Biometrics setting is enabled in BIOS.

CVE-2021-3843: A potential vulnerability in the SMI function to access EEPROM in some ThinkPad models may allow an attacker with local access and elevated privileges to execute arbitrary code.

 

Mitigation Strategy for Customers (what you should do to protect yourself):

Update system firmware to the version (or newer) indicated for your model in the Product Impact section.

 

Product Impact:

To download the version specified for your product below, follow these steps:

Navigate to the Drivers & Software support site for your product:

  1. Search for your product by name or machine type.
  2. Click Drivers & Software on the left menu panel.
  3. Click on Manual Update to browse by Component type.
  4. Compare the minimum fix version for your product from the applicable product table below with the latest version posted on the support site.

Lenovo also offers tools to assist with update management as an alternative to the manual steps described above. Refer to the following for additional help:

PC Products and Software: https://support.lenovo.com/us/en/solutions/ht504759

Server and Enterprise Software: https://support.lenovo.com/us/en/solutions/lnvo-lxcaupd and https://datacentersupport.lenovo.com/us/en/documents/lnvo-center

 

Click below links to view affected products:

ThinkPad

 

Acknowledgement:

CVE-2021-3718: Lenovo thanks Zoltan Harmarth for reporting this issue

CVE-2021-3843: Lenovo thanks Jiawei Yin(@yngweijw) and Menghao Li of IIE varas.

 

Revision History:

Revision Date Description
3 2023-08-08 Identified end of life products
2 2021-12-03 Updated ThinkPad
1 2021-10-12 Initial release

For a complete list of all Lenovo Product Security Advisories, click here.

For the most up to date information, please remain current with updates and advisories from Lenovo regarding your equipment and software. The information provided in this advisory is provided on an “as is” basis without any warranty or guarantee of any kind. Lenovo reserves the right to change or update this advisory at any time.

 

Product Impact:


ThinkPad

 

Product Component CVE-2021-3718 CVE-2021-3843
E490 (Type 20N8, 20N9) Laptop (ThinkPad) BIOS Update (Utility & Bootable CD) for Windows 10 (64-bit) - ThinkPad E490, E490s, E590 End of life Not Affected
E490s (Type 20NG) Laptop (ThinkPad) BIOS Update (Utility & Bootable CD) for Windows 10 (64-bit) - ThinkPad E490, E490s, E590 End of life Not Affected
E590 (Type 20NB, 20NC) Laptop (ThinkPad) BIOS Update (Utility & Bootable CD) for Windows 10 (64-bit) - ThinkPad E490, E490s, E590 End of life Not Affected
L490 (type 20Q5, 20Q6) Laptops (ThinkPad) BIOS Update (Utility & Bootable CD) for Windows 10 (64-bit) - ThinkPad L490, L590 End of life Not Affected
L590 (type 20Q7, 20Q8) Laptops (ThinkPad) BIOS Update (Utility & Bootable CD) for Windows 10 (64-bit) - ThinkPad L490, L590 End of life Not Affected
P43s (Type 20RH, 20RJ) Laptop (ThinkPad) BIOS Update (Utility & Bootable CD) for Windows 10 (64-bit) and Linux - ThinkPad T490, T590, P53s, P43s N2IET96W Not Affected
P52 (Type 20M9, 20MA) Laptop (ThinkPad) BIOS Update (Utility & Bootable CD) for Windows 10 (64-bit) & Linux - ThinkPad P52, P72 N2CET60W Not Affected
P53s (Type 20N6, 20N7) Laptop (ThinkPad) BIOS Update (Utility & Bootable CD) for Windows 10 (64-bit) and Linux - ThinkPad T490, T590, P53s, P43s N2IET96W Not Affected
P72 (type 20MB, 20MC) Laptop (Thinkpad) BIOS Update (Utility & Bootable CD) for Windows 10 (64-bit) & Linux - ThinkPad P52, P72 N2CET60W Not Affected
T490 (Type 20N2, 20N3) Laptop (ThinkPad) BIOS Update (Utility & Bootable CD) for Windows 10 (64-bit) and Linux - ThinkPad T490, T590, P53s, P43s N2IET96W Not Affected
T490 (Type 20RY, 20RX) Laptop (ThinkPad) BIOS Update (Utility & Bootable CD) for Windows 10 (64-bit) and Linux - ThinkPad T490, T590, P53s, P43s N2IET96W Not Affected
T490 Type 20Q9, 20QH Laptop (ThinkPad) BIOS Update (Utility & Bootable CD) for Windows 10 (64-bit) and Linux - ThinkPad T490, T590, P53s, P43s N2IET96W Not Affected
T590 (Type 20N4, 20N5) Laptop (ThinkPad) BIOS Update (Utility & Bootable CD) for Windows 10 (64-bit) and Linux - ThinkPad T490, T590, P53s, P43s N2IET96W Not Affected
X1 Fold Gen 1 (type 20RK, 20RL) Laptop (ThinkPad) BIOS Update (Utility & Bootable CD) for Windows 10 (64-bit) - ThinkPad X1 Fold Gen 1 (Types: 20RK, 20LK) Not Affected N2PET50W
X390 Yoga Laptop (ThinkPad) BIOS Update (Utility & Bootable CD) for Windows 10 (64-bit) & Linux - ThinkPad X390 Yoga N2LET87W Not Affected

Alias Id:LEN-72619
Document ID:PS500444
Original Publish Date:10/12/2021
Last Modified Date:08/08/2023