Low severity · published Sep 1, 2020
CVE-2020-8341
In Lenovo systems, SMM BIOS Write Protection is used to prevent writes to SPI Flash
2.4
CVSS
0.3%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack vector
Physical
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 28% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
TT
Thinkpad T490 (20nx) Firmware · Lenovo
before n2iet90w · source: NVD
TT
Thinkpad T490 (20qx) Firmware · Lenovo
before n2iet90w · source: NVD
TT
Thinkpad T490 (20rx) Firmware · Lenovo
before n2ret16w · source: NVD
TT
Thinkpad T490s (20nx) Firmware · Lenovo
before n2jet89w · source: NVD
TT
Thinkpad T495 Drift Firmware · Lenovo
before 2020-08-30 · source: NVD
TT
Thinkpad T590 (20nx) Firmware · Lenovo
before n2iet90w · source: NVD
TX
Thinkpad X1 Carbon (20qx) Firmware · Lenovo
before n2het54w · source: NVD
TX
Thinkpad X1 Yoga (20qx) Firmware · Lenovo
before n2het54w · source: NVD
TX
Thinkpad X390 (20qx) Firmware · Lenovo
before n2jet89w · source: NVD
TX
Thinkpad X390 (20sx) Firmware · Lenovo
before n2set18w · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-8341
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-8341
Vendor Advisory
https://support.lenovo.com/us/en/product_security/LEN-30042
More from Thinkpad T490 (20nx) Firmware
6.8
CVE-2020-8336
Lenovo implemented Intel CSME Anti-rollback ARB protections on some ThinkPad models to prevent roll back of CSME Firmware in flash