CVE-2020-8336 Security feature bypass in BIOS
Attackers can bypass Intel CSME anti-rollback protections on Lenovo ThinkPads, potentially allowing the installation of vulnerable firmware versions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2020-8336?
CVE-2020-8336 is a medium-severity vulnerability in Lenovo BIOS, published on 9 Jun 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Lenovo implemented Intel CSME Anti-rollback ARB protections on some ThinkPad models to prevent roll back of CSME Firmware in flash.
Which versions are affected by CVE-2020-8336?
It affects 38 products.
Products include Lenovo Thinkpad E14 Firmware, Lenovo Thinkpad E15 Firmware, Lenovo Thinkpad E490 Firmware, Lenovo Thinkpad E490s Firmware, Lenovo Thinkpad E590 Firmware, Lenovo Thinkpad L13 1st Gen Firmware and 32 more.
How do I fix CVE-2020-8336?
No fix has been published for CVE-2020-8336 yet. Limit exposure of the affected software until one is available.
Is CVE-2020-8336 being exploited?
There is no known exploitation of CVE-2020-8336 in the wild and no public exploit code.
Other vulnerabilities in Lenovo BIOS
Sources
Also known as GHSA-rmxg-p4v2-9f92.