low2.4
CVE-2020-8341
In Lenovo systems, SMM BIOS Write Protection is used to prevent writes to SPI Flash.
Impact
In Lenovo systems, SMM BIOS Write Protection is used to prevent writes to SPI Flash. While this provides sufficient protection, an additional layer of protection is provided by SPI Protected Range Registers (PRx). After resuming from S3 sleep mode in various versions of BIOS for some Lenovo ThinkPad systems, the PRx is not set. This does not impact the SMM BIOS Write Protection, which keeps systems protected.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Lenovo | Thinkpad T490 \(20nx\) Firmware | before n2iet90w |
| Lenovo | Thinkpad T490 \(20qx\) Firmware | before n2iet90w |
| Lenovo | Thinkpad T490 \(20rx\) Firmware | before n2ret16w |
| Lenovo | Thinkpad T490s \(20nx\) Firmware | before n2jet89w |
| Lenovo | Thinkpad T495 Drift Firmware | before 2020-08-30 |
| Lenovo | Thinkpad T590 \(20nx\) Firmware | before n2iet90w |
| Lenovo | Thinkpad X1 Carbon \(20qx\) Firmware | before n2het54w |
| Lenovo | Thinkpad X1 Yoga \(20qx\) Firmware | before n2het54w |
| Lenovo | Thinkpad X390 \(20qx\) Firmware | before n2jet89w |
| Lenovo | Thinkpad X390 \(20sx\) Firmware | before n2set18w |