CVE-2019-6156

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). Lenovo was notified that after resuming from S3 sleep mode in various versions of BIOS for Lenovo systems, the PRx is not set. This does not impact the SMM BIOS Write Protection, which keeps systems protected.

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). Lenovo was notified that after resuming from S3 sleep mode in various versions of BIOS for Lenovo systems, the PRx is not set. This does not impact the SMM BIOS Write Protection, which keeps systems protected.

En los sistemas Lenovo, SMM BIOS Write Protection se utiliza para evitar la escritura en SPI Flash. Mientras que esto proporciona suficiente protección, una capa adicional de protección es proporcionada por los Registros de Rango Protegido SPI (PRx). Se notificó a Lenovo que después de reanudar el modo de suspensión S3 en varias versiones de la BIOS para sistemas Lenovo, el PRx no está configurado. Esto no afecta a la protección contra escritura de la BIOS SMM, que mantiene los sistemas protegidos.